pike.git/src/backend.cmod:14df02056f872dcdbd8b61f69900c84c79a800a4

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5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 /* -*- c -*- || This file is part of Pike. For copyright information see COPYRIGHT. || Pike is distributed under GPL, LGPL and MPL. See the file COPYING || for more information. */ /* * Backend object. */ #include "global.h" #include "fdlib.h" #include "backend.h" #include "time_stuff.h" #include <errno.h> #ifdef HAVE_SYS_TYPES_H #include <sys/types.h> #endif #ifdef HAVE_SYS_PARAM_H #include <sys/param.h> #endif #include <string.h> #include "interpret.h" #include "object.h" #include "pike_error.h" #include "fd_control.h" #include "main.h" #include "callback.h" #include "threads.h" #include "array.h" #include <math.h> #include "interpret.h" #include "stuff.h" #include "bignum.h" #include "builtin_functions.h" #include "mapping.h" #include "svalue.h" #include "gc.h" #include "module_support.h" #include "block_allocator.h" /* * Things to do * * o what happens to callbacks on destruct? * * They will just cease to generate any events. If the callback * container object uses the old callback interface and has added an * extra ref to itself to account for the callback connection it * will become garbage. The new interface fixes this. /mast * * o automatic callback assignment based on current thread * * Sounds very odd to me. /mast */ /* For select */ #ifdef HAVE_SYS_SELECT_H #include <sys/select.h> #else /* BeOS socket (select etc) stuff */ #ifdef HAVE_NET_SOCKET_H #include <net/socket.h> #endif #endif #include <sys/stat.h> /* For poll and /dev/poll and epoll */ #ifdef HAVE_POLL_H #include <poll.h> #endif /* HAVE_POLL_H */ #ifdef HAVE_SYS_POLL_H #include <sys/poll.h> #endif /* HAVE_SYS_POLL_H */ /* For /dev/poll */ #ifdef HAVE_SYS_DEVPOLL_H #include <sys/devpoll.h> #endif /* HAVE_SYS_DEVPOLL_H */ /* For epoll */ #ifdef HAVE_SYS_EPOLL_H #include <sys/epoll.h> #endif /* HAVE_SYS_EPOLL_H */ /* For kqueue. */ #ifdef HAVE_SYS_EVENT_H #include <sys/event.h> #endif /* HAVE_SYS_EVENT_H */ /* for kqueue + CFRunLoop */ #ifdef HAVE_CORESERVICES_CORESERVICES_H #include <CoreServices/CoreServices.h> #endif /* HAVE_CORESERVICES_CORESERVICES_H */ /* The following are used on Linux'es that have an old libc. */ #ifdef HAVE_SYSCALL_H #include <syscall.h> #elif defined(HAVE_SYS_SYSCALL_H) #include <sys/syscall.h> #endif /* HAVE_SYSCALL_H || HAVE_SYS_SYSCALL_H */ /* * Debugging and tracing. */ /* #define POLL_DEBUG */ /* #define CALL_OUT_DEBUG */ #ifdef PIKE_EXTRA_DEBUG /* #define POLL_DEBUG */ /* #define CALL_OUT_DEBUG */ #endif #ifdef POLL_DEBUG #define IF_PD(x) x #else /* !POLL_DEBUG */ #define IF_PD(x) #endif /* POLL_DEBUG */ #ifdef CALL_OUT_DEBUG #define IF_CO(X) X #else #define IF_CO(X) #endif #ifdef PIKE_THREADS #define THR_NO (int) PTR_TO_INT (THREAD_T_TO_PTR (th_self())) #else #define THR_NO getpid() #endif /* Declarations for the legacy backend interface stuff. */ static struct compat_cb_box * alloc_compat_cb_box(); static void really_free_compat_cb_box(struct compat_cb_box * b); static int compat_box_dispatcher (struct fd_callback_box *box, int event); /* CALL OUT STUFF */ #ifdef PIKE_DEBUG #define MESS_UP_BLOCK(X) do {\ (X)->next_arr=(struct Backend_CallOut_struct *)(ptrdiff_t)-1; \ (X)->next_fun=(struct Backend_CallOut_struct *)(ptrdiff_t)-1; \ (X)->prev_arr=(struct Backend_CallOut_struct **)(ptrdiff_t)-1; \ (X)->prev_fun=(struct Backend_CallOut_struct **)(ptrdiff_t)-1; \ (X)->pos=-1; \ } while(0) #else #define MESS_UP_BLOCK(X) #endif #undef EXIT_BLOCK #define EXIT_BLOCK(X) do { \ *(X->prev_arr)=X->next_arr; \ if(X->next_arr) X->next_arr->prev_arr=X->prev_arr; \ *(X->prev_fun)=X->next_fun; \ if(X->next_fun) X->next_fun->prev_fun=X->prev_fun; \ MESS_UP_BLOCK(X); \ } while(0) struct hash_ent { struct Backend_CallOut_struct *arr; struct Backend_CallOut_struct *fun; }; DECLARATIONS struct callback_list do_debug_callbacks; struct timeval current_time; int current_time_invalid = 1; /* * Stuff to map fds to the proper Backend */ static struct Backend_struct **fd_map=0; static int fd_map_size=0; static struct object *default_backend_obj = NULL; PMOD_EXPORT struct Backend_struct *default_backend = NULL; #ifdef DO_PIKE_CLEANUP static int num_active_backends = 0; #endif #if defined(BACKEND_USES_CFRUNLOOP) static void noteEvents(CFFileDescriptorRef fdref, CFOptionFlags callBackTypes, void *info); #endif /* BACKEND_USES_CFRUNLOOP */ static int backend_do_call_outs(struct Backend_struct *me); static void backend_verify_call_outs(struct Backend_struct *me); static void backend_cleanup(); struct Backend_struct *get_backend_for_fd(int fd) { if(fd<0 || fd>=fd_map_size) return 0; return fd_map[fd]; } static void low_set_backend_for_fd(int fd, struct Backend_struct *b) { #ifdef PIKE_DEBUG if(fd<0) Pike_fatal("set_backend_for(%d)\n",fd); #endif if (!b) { /* Unregister the fd. */ if (fd < fd_map_size) { fd_map[fd] = NULL; } return; } if(fd >= fd_map_size) { int old=fd_map_size; if(!fd_map_size) fd_map_size=64; while(fd >= fd_map_size) fd_map_size*=2; if (fd_map) { fd_map = (struct Backend_struct **) realloc(fd_map, sizeof(struct Backend_struct *) * fd_map_size); } else { fd_map = (struct Backend_struct **) malloc(sizeof(struct Backend_struct *) * fd_map_size); } if(!fd_map) Pike_fatal("Out of memory in backend:low_set_backend_for_fd.\n" "Tried to allocate %"PRINTSIZET"d bytes.\n", sizeof(struct Backend_struct *) * fd_map_size); MEMSET(fd_map+old,0,sizeof(struct Backend_struct *) * (fd_map_size-old)); } fd_map[fd]=b; } struct Backend_struct *really_get_backend_for_fd(int fd) { struct Backend_struct *b; if((b=get_backend_for_fd(fd))) return b; #ifdef PIKE_DEBUG if(!default_backend) Pike_fatal("No backend!\n"); #endif low_set_backend_for_fd(fd, default_backend); return default_backend; } /*! @module Pike */ /*! @class __Backend *! Base class for the various backend implementations. *! *! Implements callback registration functions and defines the *! main backend APIs. */ PIKECLASS Backend { /* Provide a unique count to be able to tell backends apart with _sprintf. */ static int unused_id = 0; CVAR int id; CVAR struct timeval next_timeout; /* * Backend callbacks */ CVAR struct callback_list backend_callbacks; /*! @decl function(Backend:void) before_callback *! @decl function(Backend:void) after_callback *! *! If set, these are called just before and after the backend waits *! for an event. *! *! If an error is thrown from these callbacks then it is reported *! using @expr{master()->handle_error()@} - it doesn't interrupt *! the operation of the backend. */ /* before_callback is not strictly necessary since one can just as * well run it before `(), but it's convenient to have a standard * place to hook in a function. */ PIKEVAR function(Backend:void) before_callback; PIKEVAR function(Backend:void) after_callback; /* Thread currently executing in the backend. */ #ifdef PIKE_THREADS CVAR struct thread_state *exec_thread; #else CVAR int exec_thread; /* 1 if inside the backend. */ #endif /* * PIPE for waking up */ CVAR int wakeup_pipe_send_fd; CVAR struct fd_callback_box wakeup_cb_box; CVAR int may_need_wakeup; /* * FD callback data */ /* An array indexed on fd with arbitrary upper and lower bounds. A * lower bound is used to cut down the size for backends that * handle a single or only a few fd's. */ CVAR struct fd_callback_box **fd_boxes; CVAR int fd_boxes_start, fd_boxes_size; /* Callback boxes which don't correspond to any open file. */ CVAR struct fd_callback_box **inactive_boxes, **free_inactive_box; CVAR int inactive_boxes_size; /* * Hooks to inheriting classes. */ #ifdef PIKE_DEBUG typedef void debug_handler_fn (struct Backend_struct *me, void *data); CVAR debug_handler_fn *debug_handler; #endif /* PIKE_DEBUG */ typedef void update_fd_set_handler_fn (struct Backend_struct *me, void *data, int fd, int old_events, int new_events, int flags); CVAR update_fd_set_handler_fn *update_fd_set_handler; CVAR void *handler_data; /* * CALL OUT variables */ CVAR int num_pending_calls; /* no of busy pointers in heap */ CVAR struct Backend_CallOut_struct **call_heap; /* pointer to heap */ CVAR int call_heap_size; /* no of pointers in heap */ CVAR unsigned int hash_size; CVAR unsigned int hash_order; CVAR struct hash_ent *call_hash; /* Should really exist only in PIKE_DEBUG, but * #ifdefs on the last cvar confuses precompile.pike. * /grubba 2001-03-12 * Should be fixed now -Hubbe */ #ifdef PIKE_DEBUG CVAR int inside_call_out; #endif /* The object we're in. This ref isn't refcounted. */ CVAR struct object *backend_obj; #ifdef _REENTRANT /* Currently only used for poll devices. */ CVAR int set_busy; CVAR COND_T set_change; #endif DECLARE_STORAGE PMOD_EXPORT struct object *get_backend_obj (struct Backend_struct *b) { return b->backend_obj; } static int wakeup_callback(struct fd_callback_box *box, int UNUSED(event)) { char buffer[1024]; fd_read(box->fd, buffer, sizeof(buffer)); /* Clear 'flag' */ #ifdef _REENTRANT while (box->backend->set_busy) { co_wait_interpreter(&box->backend->set_change); } #endif /* _REENTRANT */ return 0; } /* This is used by threaded programs and signals to wake up the * master 'thread'. * * It's called from the signal handler so it must not lock any mutex * whatsoever. E.g. dmalloc stuff is verboten here. */ PMOD_EXPORT void backend_wake_up_backend(struct Backend_struct *me) { char foo=0; if(me && me->may_need_wakeup && (me->wakeup_pipe_send_fd >= 0)) { /* Avoid fd_write with its dmalloc stuff. */ int len; do { len = #ifdef HAVE_WINSOCK_H debug_fd_write #else write #endif (me->wakeup_pipe_send_fd, &foo ,1); } while ((len < 0) && (errno == EINTR)); } } /* Lower the timeout * * Typically used from backend callbacks. */ PMOD_EXPORT void backend_lower_timeout(struct Backend_struct *me, struct timeval *tv) { if (my_timercmp(tv, <=, &me->next_timeout)) { me->next_timeout = *tv; } } /* * Backend callbacks. */ PMOD_EXPORT struct callback *backend_debug_add_backend_callback( struct Backend_struct *me, callback_func call, void *arg, callback_func free_func) { return add_to_callback(& me->backend_callbacks, call, arg, free_func); } void call_backend_monitor_cb (struct Backend_struct *me, struct svalue *cb) { ref_push_object (me->backend_obj); safe_apply_svalue (cb, 1, 1); pop_stack(); } /* * Call outs. */ PIKECLASS CallOut program_flags PROGRAM_USES_PARENT; flags ID_PROTECTED|ID_PRIVATE|ID_USED; { CVAR INT32 pos; CVAR size_t fun_hval; CVAR struct timeval tv; CVAR struct Backend_CallOut_struct *next_fun; CVAR struct Backend_CallOut_struct **prev_fun; CVAR struct Backend_CallOut_struct *next_arr; CVAR struct Backend_CallOut_struct **prev_arr; PIKEVAR array args flags ID_STATIC; CVAR struct object *this; DECLARE_STORAGE; #undef CAR #undef CDR #define CAR(X) (((X)<<1)+1) #define CDR(X) (((X)<<1)+2) #define PARENT(X) (((X)-1)>>1) #define CALL_(X) (me->call_heap[(X)]) #define CALL(X) ((struct Backend_CallOut_struct *)debug_malloc_pass(CALL_(X))) #define MOVECALL(X,Y) do { INT32 p_=(X); (CALL_(p_)=CALL(Y))->pos=p_; }while(0) #define CMP(X,Y) my_timercmp(& CALL(X)->tv, <, & CALL(Y)->tv) #define SWAP(X,Y) do{ struct Backend_CallOut_struct *_tmp=CALL(X); (CALL_(X)=CALL(Y))->pos=(X); (CALL_(Y)=_tmp)->pos=(Y); } while(0) #ifdef PIKE_DEBUG static void do_unprotect_call_outs(struct Backend_struct *me) { me->inside_call_out = 0; } #define DECLARE_PROTECT_CALL_OUTS ONERROR pco_err #define PROTECT_CALL_OUTS() \ do { \ if(me->inside_call_out) \ Pike_fatal("Recursive call in call_out module.\n"); \ SET_ONERROR(pco_err, do_unprotect_call_outs, me); \ me->inside_call_out=1; \ } while(0) #define UNPROTECT_CALL_OUTS() \ CALL_AND_UNSET_ONERROR(pco_err) #else /* !PIKE_DEBUG */ #define DECLARE_PROTECT_CALL_OUTS #define PROTECT_CALL_OUTS() #define UNPROTECT_CALL_OUTS() #endif /* PIKE_DEBUG */ #ifdef PIKE_DEBUG static void backend_verify_call_outs(struct Backend_struct *me) { struct array *v; int e,d; if(!d_flag) return; if(!me->call_heap) return; if(me->num_pending_calls<0 || me->num_pending_calls>me->call_heap_size) Pike_fatal("Error in call out tables.\n"); if(d_flag<2) return; for(e=0;e<me->num_pending_calls;e++) { if(e) { if(CMP(e, PARENT(e))) Pike_fatal("Error in call out heap. (@ %d)\n",e); } if(!(v=CALL(e)->args)) Pike_fatal("No arguments to call.\n"); if(v->refs < 1) Pike_fatal("Array should have at least one reference.\n"); if(v->malloced_size<v->size) Pike_fatal("Impossible array.\n"); if(!v->size) Pike_fatal("Call out array of zero size!\n"); if(CALL(e)->prev_arr[0] != CALL(e)) Pike_fatal("call_out[%d]->prev_arr[0] is wrong!\n",e); if(CALL(e)->prev_fun[0] != CALL(e)) Pike_fatal("call_out[%d]->prev_fun[0] is wrong!\n",e); if(CALL(e)->pos != e) Pike_fatal("Call_out->pos is not correct!\n"); if(d_flag>4) { for(d=e+1;d<me->num_pending_calls;d++) if(CALL(e)->args == CALL(d)->args) Pike_fatal("Duplicate call out in heap.\n"); } } for(d=0;d<10 && e<me->call_heap_size;d++,e++) { if (CALL(e)) Pike_fatal("Call out left in heap.\n"); } for(e=0;e<(int)me->hash_size;e++) { struct Backend_CallOut_struct *c,**prev; for(prev=& me->call_hash[e].arr;(c=*prev);prev=& c->next_arr) { if(c->prev_arr != prev) Pike_fatal("c->prev_arr is wrong %p.\n",c); if(c->pos<0) Pike_fatal("Free call_out in call_out hash table %p.\n",c); } for(prev=& me->call_hash[e].fun;(c=*prev);prev=& c->next_fun) { if(c->prev_fun != prev) Pike_fatal("c->prev_fun is wrong %p.\n",c); if(c->pos<0) Pike_fatal("Free call_out in call_out hash table %p.\n",c); } } } #else #define backend_verify_call_outs(X) #endif static void adjust_down(struct Backend_struct *me,int pos) { while(1) { int a=CAR(pos), b=CDR(pos); if(a >= me->num_pending_calls) break; if(b < me->num_pending_calls) if(CMP(b, a)) a=b; if(CMP(pos, a)) break; SWAP(pos, a); pos=a; } } static int adjust_up(struct Backend_struct *me,int pos) { int parent=PARENT(pos); int from; #ifdef PIKE_DEBUG if(pos <0 || pos>=me->num_pending_calls) Pike_fatal("Bad argument to adjust_up(%d)\n",pos); #endif if(!pos) return 0; if(CMP(pos, parent)) { SWAP(pos, parent); from=pos; pos=parent; while(pos && CMP(pos, PARENT(pos))) { parent=PARENT(pos); SWAP(pos, parent); from=pos; pos=parent; } from+=from&1 ? 1 : -1; if(from < me->num_pending_calls && CMP(from, pos)) { SWAP(from, pos); adjust_down(me,from); } return 1; } return 0; } static void adjust(struct Backend_struct *me,int pos) { if(!adjust_up(me,pos)) adjust_down(me,pos); } INIT { THIS->pos = -1; THIS->this = Pike_fp->current_object; } EXIT { struct Backend_CallOut_struct *this = THIS; if (this->pos >= 0) { /* Still active in the heap. DO_PIKE_CLEANUP? */ struct Backend_struct *me = parent_storage(1); int e = this->pos; me->num_pending_calls--; if (e != me->num_pending_calls) { MOVECALL(e, me->num_pending_calls); adjust(me, e); } CALL_(me->num_pending_calls) = NULL; this->pos = -1; free_object(this->this); this->this = NULL; } EXIT_BLOCK(this); } /* Start a new call out */ PIKEFUN void create(int|float seconds, mixed fun, mixed ... extra_args) flags ID_PROTECTED; { struct array *callable; size_t fun_hval; size_t hval; struct Backend_struct *me = parent_storage(1); struct Backend_CallOut_struct *new = THIS; DECLARE_PROTECT_CALL_OUTS; push_array(callable = aggregate_array(args - 1)); args = 2; /* NOTE: hash_svalue() can run Pike code! */ fun_hval = hash_svalue(ITEM(callable)); PROTECT_CALL_OUTS(); if(me->num_pending_calls == me->call_heap_size) { /* here we need to allocate space for more pointers */ struct Backend_CallOut_struct **new_heap; if(!me->call_heap || !me->call_hash) { if (!me->call_heap) { me->call_heap_size = 128; me->call_heap = (struct Backend_CallOut_struct **) xalloc(sizeof(struct Backend_CallOut_struct *) * me->call_heap_size); MEMSET(me->call_heap, 0, sizeof(struct Backend_CallOut_struct *) * me->call_heap_size); me->num_pending_calls = 0; } if (!me->call_hash) { me->hash_size = hashprimes[me->hash_order]; me->call_hash = (struct hash_ent *)xalloc(sizeof(struct hash_ent)*me->hash_size); MEMSET(me->call_hash, 0, sizeof(struct hash_ent)*me->hash_size); } }else{ struct hash_ent *new_hash; int e; new_heap = (struct Backend_CallOut_struct **) realloc((char *)me->call_heap, sizeof(struct Backend_CallOut_struct *)*me->call_heap_size*2); if(!new_heap) Pike_error("Not enough memory for another call_out\n"); MEMSET(new_heap + me->call_heap_size, 0, sizeof(struct Backend_CallOut_struct *)*me->call_heap_size); me->call_heap_size *= 2; me->call_heap = new_heap; if((new_hash=(struct hash_ent *)malloc(sizeof(struct hash_ent)* hashprimes[me->hash_order+1]))) { free((char *)me->call_hash); me->call_hash = new_hash; me->hash_size = hashprimes[++me->hash_order]; MEMSET(me->call_hash, 0, sizeof(struct hash_ent)*me->hash_size); /* Re-hash */ for(e=0;e<me->num_pending_calls;e++) { struct Backend_CallOut_struct *c = CALL(e); hval = PTR_TO_INT(c->args); #define LINK(X,c) \ hval %= me->hash_size; \ if((c->PIKE_CONCAT(next_,X) = me->call_hash[hval].X)) \ c->PIKE_CONCAT(next_,X)->PIKE_CONCAT(prev_,X) = \ &c->PIKE_CONCAT(next_,X); \ c->PIKE_CONCAT(prev_,X) = &me->call_hash[hval].X; \ me->call_hash[hval].X = c LINK(arr,c); hval = c->fun_hval; LINK(fun,c); } } } } #ifdef PIKE_DEBUG if (CALL(me->num_pending_calls)) { Pike_fatal("Lost call out in heap.\n"); } #endif /* PIKE_DEBUG */ CALL_(me->num_pending_calls) = new; new->pos = me->num_pending_calls++; add_ref(Pike_fp->current_object); { hval = PTR_TO_INT(callable); LINK(arr,new); hval = new->fun_hval = fun_hval; LINK(fun,new); } switch(TYPEOF(*seconds)) { case T_INT: new->tv.tv_sec = seconds->u.integer; new->tv.tv_usec = 0; break; case T_FLOAT: { FLOAT_TYPE tmp = seconds->u.float_number; new->tv.tv_sec = DO_NOT_WARN((long)floor(tmp)); new->tv.tv_usec = DO_NOT_WARN((long)(1000000.0 * (tmp - floor(tmp)))); break; } default: Pike_fatal("Bad timeout to new_call_out!\n"); } #ifdef _REENTRANT if(num_threads>1) { struct timeval tmp; ACCURATE_GETTIMEOFDAY(&tmp); my_add_timeval(& new->tv, &tmp); IF_CO (fprintf (stderr, "BACKEND[%d]: Adding call out at %ld.%ld " "(current time is %ld.%ld)\n", me->id, new->tv.tv_sec, new->tv.tv_usec, tmp.tv_sec, tmp.tv_usec)); } else #endif { struct timeval tmp; INACCURATE_GETTIMEOFDAY(&tmp); my_add_timeval(& new->tv, &tmp); IF_CO (fprintf (stderr, "BACKEND[%d]: Adding call out at %ld.%ld " "(current_time is %ld.%ld)\n", me->id, new->tv.tv_sec, new->tv.tv_usec, tmp.tv_sec, tmp.tv_usec)); } new->args = callable; Pike_sp -= 2; dmalloc_touch_svalue(Pike_sp); adjust_up(me, me->num_pending_calls-1); backend_verify_call_outs(me); #ifdef _REENTRANT backend_wake_up_backend(me); #endif UNPROTECT_CALL_OUTS(); } } #undef THIS #define THIS THIS_BACKEND static void backend_count_memory_in_call_outs(struct Backend_struct *me) { push_text("num_call_outs"); push_int(me->num_pending_calls); push_text("call_out_bytes"); push_int64(me->call_heap_size * sizeof(struct Backend_CallOut_struct **)+ me->num_pending_calls * sizeof(struct Backend_CallOut_struct)); } static void count_memory_in_call_outs(struct callback *UNUSED(foo), void *UNUSED(bar), void *UNUSED(gazonk)) { backend_count_memory_in_call_outs(default_backend); } /*! @decl mapping(string:int) get_stats() *! *! Get some statistics about the backend. *! *! @returns *! Returns a mapping with the follwoing content: *! @mapping *! @member int "num_call_outs" *! The number of active call-outs. *! @member int "call_out_bytes" *! The amount of memory used by the call-outs. *! @endmapping */ PIKEFUN mapping(string:int) get_stats() { struct svalue *save_sp = Pike_sp; backend_count_memory_in_call_outs(THIS); f_aggregate_mapping(Pike_sp - save_sp); stack_pop_n_elems_keep_top(args); } /* FIXME */ #if 0 MARK { int e; struct Backend_struct *me=THIS; for(e=0;e<me->num_pending_calls;e++) { gc_mark(CALL(e)->args,0,"call out args"); } } #endif /*! @decl array call_out(function f, float|int delay, mixed ... args) *! *! Make a delayed call to a function. *! *! @[call_out()] places a call to the function @[f] with the argument *! @[args] in a queue to be called in about @[delay] seconds. *! *! If @[f] returns @expr{-1@}, no other call out or callback will be *! called by the backend in this round. I.e. @[`()] will return right *! away. For the main backend that means it will immediately start *! another round and check files and call outs anew. *! *! @returns *! Returns a call_out identifier that identifies this call_out. *! This value can be sent to eg @[find_call_out()] or @[remove_call_out()]. *! *! @seealso *! @[remove_call_out()], @[find_call_out()], @[call_out_info()] */ PIKEFUN array call_out(mixed f, int|float t, mixed ... rest) { struct svalue tmp; struct object *co; struct Backend_CallOut_struct *c; if(args<2) SIMPLE_TOO_FEW_ARGS_ERROR("call_out", 2); if(TYPEOF(*t) != T_INT && TYPEOF(*t) != T_FLOAT) SIMPLE_BAD_ARG_ERROR("call_out", 2, "int|float"); /* Swap, for compatibility */ tmp = Pike_sp[-args]; Pike_sp[-args] = Pike_sp[1-args]; Pike_sp[1-args] = tmp; apply_current(Backend_CallOut_program_fun_num, args); args = 1; get_all_args("low_call_out", args, "%o", &co); c = (struct Backend_CallOut_struct *) get_storage(co, Backend_CallOut_program); if (!c) Pike_error("low_call_out(): Unexpected object from CallOut.\n"); ref_push_array(c->args); stack_pop_n_elems_keep_top(args); } /* Assumes current_time is correct on entry. */ static int backend_do_call_outs(struct Backend_struct *me) { int call_count = 0; int args; struct timeval tmp, now; backend_verify_call_outs(me); INACCURATE_GETTIMEOFDAY(&now); tmp.tv_sec = now.tv_sec; tmp.tv_usec = now.tv_usec; tmp.tv_sec++; while(me->num_pending_calls && my_timercmp(&CALL(0)->tv, <= ,&now)) { struct timeval now; /* unlink call out */ struct Backend_CallOut_struct *cc; DECLARE_PROTECT_CALL_OUTS; PROTECT_CALL_OUTS(); cc=CALL(0); if(--me->num_pending_calls) { MOVECALL(0,me->num_pending_calls); adjust_down(me, 0); } CALL_(me->num_pending_calls) = NULL; UNPROTECT_CALL_OUTS(); cc->pos = -1; args = cc->args->size; push_array_items(cc->args); cc->args = NULL; free_object(cc->this); check_destructed(Pike_sp - args); if(TYPEOF(Pike_sp[-args]) != T_INT) { IF_CO( fprintf(stderr, "[%d]BACKEND[%d]: backend_do_call_outs: " "calling call out ", THR_NO, me->id); print_svalue (stderr, Pike_sp - args); fputc ('\n', stderr); ); call_count++; f_call_function(args); if (TYPEOF(Pike_sp[-1]) == T_INT && Pike_sp[-1].u.integer == -1) { pop_stack(); backend_verify_call_outs(me); call_count = -call_count; break; } else pop_stack(); }else{ IF_CO(fprintf(stderr, "[%d]BACKEND[%d]: backend_do_call_outs: " "ignoring destructed call out\n", THR_NO, me->id)); pop_n_elems(args); } backend_verify_call_outs(me); ACCURATE_GETTIMEOFDAY(&now); if(my_timercmp(&now, > , &tmp)) break; } IF_CO ( if (me->num_pending_calls) fprintf (stderr, "BACKEND[%d]: backend_do_call_outs: stopping with %d " "call outs left, closest with time %ld.%ld " "(current_time %ld.%ld, limit at %ld.%ld)\n", me->id, me->num_pending_calls, CALL(0)->tv.tv_sec, CALL(0)->tv.tv_usec, now.tv_sec, now.tv_usec, tmp.tv_sec, tmp.tv_usec); else fprintf (stderr, "BACKEND[%d]: backend_do_call_outs: " "no outstanding call outs\n", me->id); ); return call_count; } static int backend_find_call_out(struct Backend_struct *me, struct svalue *fun) { size_t hval, fun_hval; struct Backend_CallOut_struct *c; if(!me->num_pending_calls) return -1; if(TYPEOF(*fun) == T_ARRAY) { hval=PTR_TO_INT(fun->u.array); hval%=me->hash_size; for(c=me->call_hash[hval].arr;c;c=c->next_arr) { if(c->args == fun->u.array) { #ifdef PIKE_DEBUG if(CALL(c->pos) != c) Pike_fatal("Call_out->pos not correct!\n"); #endif return c->pos; } } } /* Note: is_eq() may call Pike code (which we want), * however, it cannot modify the hash_table since * we are protected by PROTECT_CALL_OUTS. */ fun_hval=hash_svalue(fun); hval = fun_hval % me->hash_size; for(c=me->call_hash[hval].fun;c;c=c->next_fun) { if(c->fun_hval == fun_hval) { #ifdef PIKE_DEBUG if(CALL(c->pos) != c) Pike_fatal("Call_out->pos not correct!\n"); #endif if (is_eq(fun, ITEM(c->args))) { return c->pos; } } } return -1; } /*! @decl int _do_call_outs() *! *! Do all pending call_outs. *! *! This function runs all pending call_outs that should have been *! run if Pike returned to the backend. It should not be used in *! normal operation. *! *! As a side-effect, this function sets the value returned by *! @[time(1)] to the current time. *! *! @returns *! Zero if no call outs were called, nonzero otherwise. *! *! @seealso *! @[call_out()], @[find_call_out()], @[remove_call_out()] */ PIKEFUN int _do_call_outs() { INVALIDATE_CURRENT_TIME(); RETURN backend_do_call_outs(THIS); } /*! @decl int find_call_out(function f) *! @decl int find_call_out(array id) *! *! Find a call out in the queue. *! *! This function searches the call out queue. If given a function as *! argument, it looks for the first call out scheduled to that function. *! *! The argument can also be a call out id as returned by @[call_out()], in *! which case that call_out will be found (Unless it has already been *! called). *! *! @returns *! @[find_call_out()] returns the remaining time in seconds before that *! call_out will be executed. If no call_out is found, *! @[zero_type](@[find_call_out](f)) will return 1. *! *! @seealso *! @[call_out()], @[remove_call_out()], @[call_out_info()] */ PIKEFUN int find_call_out(function|mixed f) { struct Backend_struct *me=THIS; int e; DECLARE_PROTECT_CALL_OUTS; backend_verify_call_outs(me); PROTECT_CALL_OUTS(); e=backend_find_call_out(me, f); pop_n_elems(args); if(e==-1) { /* NB: This is a very exotic value! */ SET_SVAL(*Pike_sp, T_INT, NUMBER_UNDEFINED, integer, -1); Pike_sp++; }else{ struct timeval now; INACCURATE_GETTIMEOFDAY(&now); push_int(CALL(e)->tv.tv_sec - now.tv_sec); } UNPROTECT_CALL_OUTS(); backend_verify_call_outs(me); } /*! @decl int remove_call_out(function f) *! @decl int remove_call_out(array id) *! *! Remove a call out from the call out queue. *! *! This function finds the first call to the function @[f] in the call_out *! queue and removes it. You can also give a call out id as argument (as *! returned by @[call_out()]). *! *! @returns *! The remaining time in seconds left to that call out will be returned. *! If no call_out was found, @[zero_type](@[remove_call_out](@[f])) *! will return 1. *! *! @seealso *! @[call_out_info()], @[call_out()], @[find_call_out()] */ PIKEFUN int remove_call_out(function|mixed f) { struct Backend_struct *me=THIS; int e; DECLARE_PROTECT_CALL_OUTS; PROTECT_CALL_OUTS(); backend_verify_call_outs(me); e=backend_find_call_out(me,f); backend_verify_call_outs(me); if(e!=-1) { struct Backend_CallOut_struct *c = CALL(e); struct timeval now; INACCURATE_GETTIMEOFDAY(&now); IF_CO (fprintf (stderr, "BACKEND[%d]: Removing call out at %ld.%ld " "(current_time is %ld.%ld)\n", me->id, c->tv.tv_sec, c->tv.tv_usec, now.tv_sec, now.tv_usec)); pop_n_elems(args); push_int(c->tv.tv_sec - now.tv_sec); me->num_pending_calls--; if(e!=me->num_pending_calls) { MOVECALL(e,me->num_pending_calls); adjust(me,e); } CALL_(me->num_pending_calls) = NULL; c->pos = -1; free_object(c->this); }else{ pop_n_elems(args); /* NB: This is a very exotic value! */ SET_SVAL(*Pike_sp, T_INT, NUMBER_UNDEFINED, integer, -1); Pike_sp++; } backend_verify_call_outs(me); UNPROTECT_CALL_OUTS(); } /* return an array containing info about all call outs: * ({ ({ delay, caller, function, args, ... }), ... }) */ struct array *backend_get_all_call_outs(struct Backend_struct *me) { int e; struct array *ret; struct timeval now; ONERROR err; DECLARE_PROTECT_CALL_OUTS; backend_verify_call_outs(me); PROTECT_CALL_OUTS(); ret=allocate_array_no_init(0, me->num_pending_calls); SET_ONERROR(err, do_free_array, ret); ret->type_field = BIT_ARRAY; if(me->num_pending_calls) INACCURATE_GETTIMEOFDAY(&now); for(e=0;e<me->num_pending_calls;e++) { struct array *v; v=allocate_array_no_init(CALL(e)->args->size+2, 0); ITEM(v)[0].u.integer=CALL(e)->tv.tv_sec - now.tv_sec; /* FIXME: ITEM(v)[1] used to be the current object * from when the call_out was created, but * that is always the backend since the * backend.cmod rewrite. * Now we just leave it zero. */ v->type_field = BIT_INT; v->type_field |= assign_svalues_no_free(ITEM(v)+2, ITEM(CALL(e)->args), CALL(e)->args->size,BIT_MIXED); SET_SVAL(ITEM(ret)[e], T_ARRAY, 0, array, v); ret->size++; } UNSET_ONERROR(err); UNPROTECT_CALL_OUTS(); return ret; } /*! @decl array(array) call_out_info() *! *! Get info about all call_outs. *! *! This function returns an array with one entry for each entry in the *! call out queue. The first in the queue will be at index 0. Each index *! contains an array that looks like this: *! @array *! @elem int time_left *! Time remaining in seconds until the call_out is to be performed. *! @elem int(0..0) zero *! Used to be the object that scheduled the call_out. *! @elem function fun *! Function to be called. *! @elem mixed ... args *! Arguments to the function. *! @endarray *! *! @seealso *! @[call_out()], @[find_call_out()], @[remove_call_out()] */ PIKEFUN array(array) call_out_info() { RETURN backend_get_all_call_outs(THIS); } /* * FD box handling */ #define GET_ACTIVE_BOX(ME, FD) \ ((ME)->fd_boxes[(FD) - (ME)->fd_boxes_start]) #define GET_BOX(ME, FD) \ ((FD) < 0 ? \ (ME)->inactive_boxes[~(FD)] : \ (ME)->fd_boxes[(FD) - (ME)->fd_boxes_start]) #define SAFE_GET_ACTIVE_BOX(ME, FD) \ ((FD) >= (ME)->fd_boxes_start && \ (FD) < (ME)->fd_boxes_start + (ME)->fd_boxes_size ? \ GET_ACTIVE_BOX (ME, FD) : NULL) static struct fd_callback_box *safe_get_box (struct Backend_struct *me, int fd) { if (fd < 0) { fd = ~fd; if (fd < me->inactive_boxes_size) { struct fd_callback_box *box = me->inactive_boxes[fd]; /* Avoid free list pointers. */ if ((struct fd_callback_box **) box < me->inactive_boxes || (struct fd_callback_box **) box >= me->inactive_boxes + me->inactive_boxes_size) return box; } } else { fd -= me->fd_boxes_start; if (fd >= 0 && fd < me->fd_boxes_size) return me->fd_boxes[fd]; } return NULL; } PMOD_EXPORT struct fd_callback_box *get_fd_callback_box_for_fd( struct Backend_struct *me, int fd ) { return safe_get_box( me, fd ); } /* NOTE: Some versions of AIX seem to have a * #define events reqevents * in one of the poll headerfiles. This will break * the fd_box event handling. */ #undef events /* Make sure the WANT_EVENT() macro is useable... */ #undef READ #undef WRITE #undef READ_OOB #undef WRITE_OOB #undef FS_EVENT #undef ERROR #define WANT_EVENT(BOX, WHAT) \ ((BOX) && (BOX)->events & PIKE_CONCAT (PIKE_BIT_FD_, WHAT)) #define FOR_EACH_ACTIVE_FD_BOX(ME, BOX_VAR) \ struct Backend_struct *me_ = (ME); \ struct fd_callback_box *BOX_VAR, **boxes_ = me_->fd_boxes; \ int b_, max_ = me_->fd_boxes_size; \ for (b_ = 0; b_ < max_; b_++) \ if ((BOX_VAR = boxes_[b_])) #define FOR_EACH_INACTIVE_FD_BOX(ME, BOX_VAR) \ struct Backend_struct *me_ = (ME); \ struct fd_callback_box *BOX_VAR, **boxes_ = me_->inactive_boxes; \ int b_ = 0, max_ = me_->inactive_boxes_size; \ for (b_ = 0; b_ < max_; b_++) \ if ((BOX_VAR = boxes_[b_]) && \ /* Avoid free list pointers. */ \ ((struct fd_callback_box **) BOX_VAR < boxes_ || \ (struct fd_callback_box **) BOX_VAR >= boxes_+max_)) #ifdef PIKE_DEBUG static void check_box (struct fd_callback_box *box, int fd) { struct Backend_struct *me; if (!box) return; if (!(me = box->backend)) Pike_fatal ("fd_callback_box not hooked to any backend.\n"); if (fd == INT_MAX) fd = box->fd; else if (fd != box->fd) Pike_fatal ("fd in callback box doesn't correspond to where it's found.\n"); if (safe_get_box (me, fd) != box) Pike_fatal ("fd_callback_box not hooked in correctly for fd %d.\n", box->fd); } #else # define check_box(box, fd) do {} while (0) #endif static void add_fd_box (struct fd_callback_box *box) { struct Backend_struct *me = box->backend; int fd = box->fd; #ifdef PIKE_DEBUG if (fd >= 0) { struct fd_callback_box *old_box = SAFE_GET_ACTIVE_BOX (me, fd); if (old_box == box) Pike_fatal ("The box is already hooked in.\n"); if (old_box) Pike_fatal ("There's another callback box %p for fd %d.\n", old_box, fd); if (get_backend_for_fd (fd) && get_backend_for_fd (fd) != me) Pike_fatal ("The fd is allocated to another backend.\n"); } else { int i; for (i = 0; i < me->inactive_boxes_size; i++) if (me->inactive_boxes[i] == box) Pike_fatal ("The box is already hooked in.\n"); } #endif if (fd >= 0) { low_set_backend_for_fd (fd, me); if (!me->fd_boxes_size) { /* Start small since backends with only a single fd aren't uncommon. */ me->fd_boxes_size = 4; me->fd_boxes = calloc (sizeof (me->fd_boxes[0]), me->fd_boxes_size); if (!me->fd_boxes) Pike_fatal ("Out of memory in backend::add_fd_box(): " "Tried to allocate %d fd_callback_box pointers\n", me->fd_boxes_size); me->fd_boxes_start = fd; fd = 0; } else if (fd < me->fd_boxes_start) { int old_size = me->fd_boxes_size, shift = me->fd_boxes_size; struct fd_callback_box **old_boxes = me->fd_boxes; IF_PD(fprintf(stderr, "me->fd_boxes: %p (%d ==> %d)\n", me->fd_boxes, me->fd_boxes_start, fd)); while (fd < me->fd_boxes_start - shift) shift *= 2; if (me->fd_boxes_start - shift < 0) shift = me->fd_boxes_start; me->fd_boxes_start -= shift; me->fd_boxes_size += shift; debug_malloc_touch(me->fd_boxes); me->fd_boxes = realloc (me->fd_boxes, sizeof (me->fd_boxes[0]) * me->fd_boxes_size); if (!me->fd_boxes) Pike_fatal ("Out of memory in backend::add_fd_box(): " "Tried to allocate %d fd_callback_box pointers\n", me->fd_boxes_size); MEMMOVE (me->fd_boxes + shift, me->fd_boxes, sizeof (me->fd_boxes[0]) * old_size); MEMSET (me->fd_boxes, 0, sizeof (me->fd_boxes[0]) * shift); debug_malloc_touch(me->fd_boxes); fd -= me->fd_boxes_start; } else { fd -= me->fd_boxes_start; if (fd >= me->fd_boxes_size) { int old_size=me->fd_boxes_size; while(fd >= me->fd_boxes_size) me->fd_boxes_size*=2; debug_malloc_touch(me->fd_boxes); me->fd_boxes = realloc(me->fd_boxes, sizeof(me->fd_boxes[0]) * me->fd_boxes_size); if( !me->fd_boxes ) Pike_fatal("Out of memory in backend::add_fd_box(): " "Tried to allocate %d fd_callback_box pointers\n", me->fd_boxes_size); MEMSET(me->fd_boxes+old_size, 0, (me->fd_boxes_size-old_size)*sizeof(me->fd_boxes[0])); debug_malloc_touch(me->fd_boxes); } } me->fd_boxes[fd] = box; } else { /* Add an inactive box. */ int pos; if (!me->free_inactive_box) { pos = me->inactive_boxes_size; if (!me->inactive_boxes_size) me->inactive_boxes_size = 4; else me->inactive_boxes_size *= 2; if (!me->inactive_boxes) me->inactive_boxes = malloc (sizeof (me->inactive_boxes[0]) * me->inactive_boxes_size); else { #ifdef PIKE_DEBUG { struct fd_callback_box **p, **boxes = me->inactive_boxes; int i; int max = pos; /* me->inactive_boxes_size before enlargement. */ for (i = 0; i < max; i++) if ((p = (struct fd_callback_box **) boxes[i]) && p >= boxes && p < boxes + max) Pike_fatal ("Still got free list pointers in inactive box " "list that is about to be enlarged.\n"); } #endif me->inactive_boxes = realloc (me->inactive_boxes, sizeof (me->inactive_boxes[0]) * me->inactive_boxes_size); } if (!me->inactive_boxes) Pike_fatal ("Out of memory in backend::add_fd_box(): " "Tried to allocate %d inactive fd_callback_box pointers\n", me->inactive_boxes_size); me->free_inactive_box = me->inactive_boxes + pos; while (++pos < me->inactive_boxes_size) me->inactive_boxes[pos - 1] = (struct fd_callback_box *) (me->inactive_boxes + pos); me->inactive_boxes[pos - 1] = NULL; } pos = me->free_inactive_box - me->inactive_boxes; me->free_inactive_box = (struct fd_callback_box **) *me->free_inactive_box; me->inactive_boxes[pos] = box; box->fd = ~pos; } } static void remove_fd_box (struct fd_callback_box *box) { struct Backend_struct *me = box->backend; int fd = box->fd; check_box (box, INT_MAX); /* FIXME: Shrink arrays? */ if (fd >= 0) { low_set_backend_for_fd (fd, NULL); me->fd_boxes[fd - me->fd_boxes_start] = NULL; } else { fd = ~fd; me->inactive_boxes[fd] = (struct fd_callback_box *) me->free_inactive_box; me->free_inactive_box = me->inactive_boxes + fd; } } static void update_fd_set (struct Backend_struct *me, int fd, int old_events, int new_events, int flags) { if (fd < 0) return; #ifdef __NT__ if (new_events && !(fd_query_properties(fd, fd_CAN_NONBLOCK) & fd_CAN_NONBLOCK)) { Pike_fatal("update_fd_set() on non-socket!\n"); } #endif /* __NT__ */ IF_PD(fprintf(stderr, "update_fd_set(%p, %d, 0x%08x, 0x%08x)\n", me, fd, old_events, new_events)); if (me->update_fd_set_handler) { me->update_fd_set_handler(me, me->handler_data, fd, old_events, new_events, flags); } else { Pike_fatal("No update_fd_set_handler set[%p, %d, 0x%04x, 0x%04x].\n"); } } PMOD_EXPORT void hook_fd_callback_box (struct fd_callback_box *box) { struct Backend_struct *me = box->backend; int fd = box->fd; IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: hook_fd_callback_box: " "fd %d, events 0x%x, object %p\n", THR_NO, me->id, fd, box->events, box->ref_obj)); #ifdef PIKE_DEBUG if (!me) Pike_fatal ("Backend not set.\n"); #endif #ifdef __NT__ if ((fd >= 0) && box->events && !(fd_query_properties(fd, fd_CAN_NONBLOCK) & fd_CAN_NONBLOCK)) { Pike_fatal("hook_fd_callback_box() on non-socket!\n" " fd: %d\n" " events: 0x%04x\n" " fd_properties: 0x%04x\n", fd, box->events, fd_query_properties(fd, fd_CAN_NONBLOCK)); } #endif /* __NT__ */ add_fd_box (box); if (fd >= 0) update_fd_set (me, fd, 0, box->events, box->flags); if (box->ref_obj && box->events) add_ref (box->ref_obj); } PMOD_EXPORT void unhook_fd_callback_box (struct fd_callback_box *box) { /* Accept an unhooked box; can happen when we're called from an * object exit hook due to being freed by free_object below. */ if (!box->backend) { IF_PD(fprintf(stderr, "[%d]BACKEND[unhooked box]: unhook_fd_callback_box: " "fd %d, object %p\n", THR_NO, box->fd, box->ref_obj)); return; } check_box (box, INT_MAX); IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: unhook_fd_callback_box: fd %d, object %p\n", THR_NO, box->backend->id, box->fd, box->ref_obj)); if (box->fd >= 0) update_fd_set (box->backend, box->fd, box->events, 0, box->flags); remove_fd_box (box); box->backend = NULL; /* Make sure no further callbacks are called on this box. */ box->revents = 0; box->rflags = 0; if (box->ref_obj && box->events) { /* Use gc safe method to allow calls from within the gc. */ /* box->ref_obj is only converted from a counted to * non-counted ref, so it shouldn't be clobbered by the free. */ union anything u; u.object = box->ref_obj; gc_free_short_svalue (&u, T_OBJECT); } } PMOD_EXPORT void set_fd_callback_events (struct fd_callback_box *box, int events, int flags) { int old_events = box->events; check_box (box, INT_MAX); IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: set_fd_callback_events: " "fd %d, events from 0x%x to 0x%x, object %p\n", THR_NO, box->backend->id, box->fd, old_events, events, box->ref_obj)); if (box->fd >= 0) update_fd_set (box->backend, box->fd, old_events, events, flags); box->events = events; box->flags = flags; if (box->ref_obj) { if (!old_events) { if (events) add_ref (box->ref_obj); } else if (!events) { /* Use gc safe method to allow calls from within the gc. */ /* box->ref_obj is only converted from a counted to * non-counted ref, so it shouldn't be clobbered by the free. */ union anything u; u.object = box->ref_obj; gc_free_short_svalue (&u, T_OBJECT); } } } PMOD_EXPORT void change_backend_for_box (struct fd_callback_box *box, struct Backend_struct *new) { struct Backend_struct *old = box->backend; if (old) check_box (box, INT_MAX); #ifdef PIKE_DEBUG if (!new) Pike_fatal ("New backend is invalid.\n"); #endif IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: change_backend_for_box: " "fd %d, new backend %d\n", THR_NO, old?old->id:-1, box->fd, new->id)); if (old != new) { if (old) { if (box->fd >= 0) update_fd_set (old, box->fd, box->events, 0, box->flags); remove_fd_box (box); if (box->next) { /* The box is active in the old backend. Unlink it. */ struct fd_callback_box *pred = box->next; /* Find the predecessor. */ while (pred->next != box) { pred = pred->next; } pred->next = box->next; box->next = NULL; if (box->ref_obj) free_object(box->ref_obj); } } box->backend = new; add_fd_box (box); if (box->fd >= 0) update_fd_set (new, box->fd, 0, box->events, box->flags); } } PMOD_EXPORT void change_fd_for_box (struct fd_callback_box *box, int new_fd) { int old_fd = box->fd; if (!box->backend) { /* Convenience so that the caller doesn't have to check if the * box is hooked in. */ IF_PD(fprintf(stderr, "[%d]BACKEND[unhooked box]: change_fd_for_box: " "fd from %d to %d, obj: %p\n", THR_NO, old_fd, new_fd, box->ref_obj)); box->fd = new_fd; box->revents = 0; box->rflags = 0; } else { check_box (box, INT_MAX); if (old_fd >= 0 ? old_fd != new_fd : new_fd >= 0) { if (old_fd >= 0) update_fd_set (box->backend, old_fd, box->events, 0, box->flags); remove_fd_box (box); box->fd = new_fd; add_fd_box (box); new_fd = box->fd; box->revents = 0; box->rflags = 0; if (new_fd >= 0) update_fd_set (box->backend, new_fd, 0, box->events, box->flags); } IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: change_fd_for_box: " "fd from %d to %d\n", THR_NO, box->backend->id, old_fd, new_fd)); } } static void do_free_fd_box(struct fd_callback_box *box) { if (box->ref_obj) free_object(box->ref_obj); } static void do_free_fd_list(struct fd_callback_box *fd_list) { struct fd_callback_box *box; while ((box = fd_list->next)) { fd_list->next = box->next; box->next = NULL; if (box->ref_obj) free_object(box->ref_obj); } } #ifdef PIKE_DEBUG static void backend_do_debug(struct Backend_struct *me) { backend_verify_call_outs(me); if (me->debug_handler) { me->debug_handler(me, me->handler_data); } {FOR_EACH_ACTIVE_FD_BOX (me, box) check_box (box, INT_MAX);} {FOR_EACH_INACTIVE_FD_BOX (me, box) check_box (box, INT_MAX);} } #endif /* PIKE_DEBUG */ /*! @decl float|int(0..0) `()(void|float|int(0..0) sleep_time) *! Perform one pass through the backend. *! *! Calls any outstanding call-outs and non-blocking I/O *! callbacks that are registred in this backend object. *! *! @param sleep_time *! Wait at most @[sleep_time] seconds. The default when *! unspecified or the integer @expr{0@} is no time limit. *! *! @returns *! If the backend did call any callbacks or call outs then the *! time spent in the backend is returned as a float. Otherwise *! the integer @expr{0@} is returned. *! *! @seealso *! @[Pike.DefaultBackend], @[main()] */ PIKEFUN float|int(0..0) `()(void|float|int(0..0) sleep_time) prototype; { } #ifndef tObjImpl_THREAD_THREAD /* Kludge for precompile.pike; it resolves object(Thread.Thread) * to tObjImpl_THREAD_THREAD, while "program_id.h" only knows about * tObjImpl_THREAD_ID. */ #define tObjImpl_THREAD_THREAD tObjImpl_THREAD_ID #endif /* !tObjImpl_THREAD_THREAD */ /*! @decl Thread.Thread executing_thread() *! @decl int executing_thread() *! *! Return the thread currently executing in the backend. I.e. the *! thread that has called @[`()] and hasn't exited from that call. *! Zero is returned if there's no thread in the backend. *! *! If Pike is compiled without thread support then @expr{1@} is *! returned if we're inside the backend, @expr{0@} otherwise. */ PIKEFUN object(Thread.Thread)|int(0..1) executing_thread() /* FIXME: The type is too weak, but precompile.pike doesn't * understand different function variants in cpp branches. */ { pop_n_elems (args); #ifdef PIKE_THREADS if (THIS->exec_thread) ref_push_object (THIS->exec_thread->thread_obj); else push_int (0); #else push_int (THIS->exec_thread); #endif } /*! @decl void add_file(Stdio.File|Stdio.FILE f) *! *! Register a file to be handled by this backend. *! *! @param f *! File to register. *! *! Registers @[f] to be handled by this backend. *! This simply does @expr{f->set_backend(backend)@} where *! @expr{backend@} is this object. *! *! @seealso *! @[Pike.DefaultBackend], @[main()] */ PIKEFUN void add_file(object f) { ref_push_object (Pike_fp->current_object); apply (f, "set_backend", 1); pop_stack(); } /*! @decl int id() *! *! Return an integer that uniquely identifies this backend. For *! the default backend that integer is @expr{0@}. */ PIKEFUN int id() { RETURN (THIS->id); } PIKEFUN string _sprintf(int type, mapping flags) { if (type == 'O') { push_constant_text ("Pike.Backend(%d)"); push_int (THIS->id); f_sprintf (2); stack_pop_n_elems_keep_top (args); } else { pop_n_elems (args); push_int (0); } } extern int pike_make_pipe(int *); GC_CHECK { struct Backend_struct *me = (struct Backend_struct *) Pike_fp->current_storage; int e; for (e = 0; e < me->num_pending_calls; e++) { if (CALL(e)->this) debug_gc_check (CALL(e)->this, " as call out in backend object"); } {FOR_EACH_ACTIVE_FD_BOX (me, box) { check_box (box, INT_MAX); if (box->ref_obj && box->events) debug_gc_check (box->ref_obj, " as container object " "for an active callback in backend object"); }} {FOR_EACH_INACTIVE_FD_BOX (me, box) { check_box (box, INT_MAX); if (box->ref_obj && box->events) debug_gc_check (box->ref_obj, " as container object " "for an inactive callback in backend object"); }} } GC_RECURSE { struct Backend_struct *me = (struct Backend_struct *) Pike_fp->current_storage; int e; for (e = 0; e < me->num_pending_calls; e++) { if (CALL(e)->this) gc_recurse_short_svalue ((union anything *) &CALL(e)->this, T_OBJECT); } {FOR_EACH_ACTIVE_FD_BOX (me, box) { if (box->ref_obj && box->events) gc_recurse_short_svalue ((union anything *) &box->ref_obj, T_OBJECT); }} {FOR_EACH_INACTIVE_FD_BOX (me, box) { if (box->ref_obj && box->events) gc_recurse_short_svalue ((union anything *) &box->ref_obj, T_OBJECT); }} } static void low_backend_cleanup (struct Backend_struct *me) { me->exec_thread = 0; } static void low_backend_once_setup(struct Backend_struct *me, struct timeval *start_time) { #ifdef PIKE_DEBUG struct timeval max_timeout; #endif struct timeval *next_timeout = &me->next_timeout, now; alloca(0); /* Do garbage collect */ #ifdef PIKE_DEBUG if(d_flag > 1) do_debug(); #endif if(me->exec_thread) { #ifdef PIKE_THREADS if (me->exec_thread != Pike_interpreter.thread_state) Pike_error ("Backend already in use by another thread.\n"); else #endif /* It's actually not a problem to make this function * reentrant, but that'd introduce a risk of races in the * callbacks (i.e. between when a read callback is called * and when it reads the data), and besides I can't think * of any sane way to use it. Also, this error can help * discover otherwise tricky bugs. /mast */ Pike_error ("Backend already running - cannot reenter.\n"); } #ifdef PIKE_THREADS me->exec_thread = Pike_interpreter.thread_state; #else me->exec_thread = 1; #endif #ifndef OWN_GETHRTIME ACCURATE_GETTIMEOFDAY(&now); #else /* good place to run the gethrtime-conversion update since we have to run gettimeofday anyway /Mirar */ INACCURATE_GETTIMEOFDAY(&now); own_gethrtime_update(&now); #endif if (start_time->tv_sec < 0) { next_timeout->tv_sec = -1; next_timeout->tv_usec = 0; } else { *next_timeout = *start_time; my_add_timeval(next_timeout, &now); } *start_time = now; /* Call outs */ if(me->num_pending_calls) if(next_timeout->tv_sec < 0 || my_timercmp(& CALL(0)->tv, < , next_timeout)) *next_timeout = CALL(0)->tv; #ifdef PIKE_DEBUG max_timeout = *next_timeout; #endif call_callback(& me->backend_callbacks, me); #ifdef PIKE_DEBUG if (max_timeout.tv_sec >= 0 && (next_timeout->tv_sec < 0 || my_timercmp (&max_timeout, <, next_timeout))) Pike_fatal ("Timeout raised from %lu.%lu to %lu.%lu by a backend callback.\n", (unsigned long)max_timeout.tv_sec, (unsigned long)max_timeout.tv_usec, (unsigned long)next_timeout->tv_sec, (unsigned long)next_timeout->tv_usec); #endif if (next_timeout->tv_sec < 0) { /* Wait "forever". */ next_timeout->tv_sec = 100000000; next_timeout->tv_usec = 0; } else if(my_timercmp(next_timeout, > , &now)) { my_subtract_timeval(next_timeout, &now); }else{ next_timeout->tv_usec = 0; next_timeout->tv_sec = 0; } } /* Call callbacks for the active events. * * NOTE: The first element in the fd_list is a sentinel! * * returns 1 on early exit. */ static int backend_call_active_callbacks(struct fd_callback_box *fd_list, struct Backend_struct *me) { struct fd_callback_box *box; while((box = fd_list->next)) { int fd = box->fd; ONERROR uwp; /* Unhook the box. */ fd_list->next = box->next; box->next = NULL; SET_ONERROR(uwp, do_free_fd_box, box); IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: Examining box for fd %d" " revents:0x%04x\n", THR_NO, me->id, fd, box->revents)); if (box->fd < 0) { /* The box is no longer active. * Or we have found our sentinel fd_list. * * Note that the loop will terminate, since we * have broken the cycle above when we set * box->next to NULL. */ CALL_AND_UNSET_ONERROR(uwp); continue; } /* From the roxen-chat re: connecttest.pike/FreeBSD: * * kqueue is returning the correct info: * {7,EVFILT_READ,EV_ADD|EV_EOF,61,0x0,0x0}. * errno 61 is ECONNREFUSED */ if (box->revents & box->events & PIKE_BIT_FD_READ_OOB) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: read_oob_callback(%d, %p)\n", THR_NO, me->id, fd, box->ref_obj)); errno = 0; if (box->callback (box, PIKE_FD_READ_OOB) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } if (box->revents & box->events & PIKE_BIT_FD_READ) { /* FIXME: Consider utilizing ACTIVE_POLLSET[i].data in * the kqueue case. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: read_callback(%d, %p)\n", THR_NO, me->id, fd, box->ref_obj)); errno = 0; if (box->callback (box, PIKE_FD_READ) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } if (box->revents & box->events & PIKE_BIT_FD_WRITE_OOB) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: write_oob_callback(%d, %p)\n", THR_NO, me->id, fd, box->ref_obj)); errno = 0; if (box->callback (box, PIKE_FD_WRITE_OOB) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } if (box->revents & box->events & PIKE_BIT_FD_WRITE) { /* FIXME: Consider utilizing ACTIVE_POLLSET[i].data in * the kqueue case. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: write_callback(%d, %p)\n", THR_NO, me->id, fd, box->ref_obj)); errno = 0; if (box->callback (box, PIKE_FD_WRITE) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } if (box->revents & box->events & PIKE_BIT_FD_FS_EVENT) { /* FIXME: Consider utilizing ACTIVE_POLLSET[i].data in * the kqueue case. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: fs_event_callback(%d, %p)\n", THR_NO, me->id, fd, box->ref_obj)); errno = 0; if (box->callback (box, PIKE_FD_FS_EVENT) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } if (box->revents & PIKE_BIT_FD_ERROR) { /* Error */ int old_events; int err; ACCEPT_SIZE_T len = sizeof (err); errno = 0; /* FIXME: This could be too late - the error might be * clobbered by the callbacks we might have called * above. */ if (!getsockopt (fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len)) { IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: POLLERR on %d, error=%d\n", THR_NO, me->id, fd, err)); errno = err; } else { /* Note: This happens for FIFOs and PIPEs on Linux on the write-end * if the read-end has been closed. */ #ifdef PIKE_DEBUG #ifdef ENOTSOCK if (errno != ENOTSOCK) { #endif fprintf(stderr, "Got POLLERR on non-socket fd %d (getsockopt errno=%d)\n", fd, errno); #ifdef ENOTSOCK } else { IF_PD(fprintf(stderr, "Got POLLERR on non-socket fd %d\n", fd)); } #endif #endif /* PIKE_DEBUG */ errno = err = EPIPE; } box->revents = 0; box->rflags = 0; /* We don't want to keep this fd anymore. * Note: This disables any further callbacks. */ old_events = box->events; set_fd_callback_events (box, box->events & PIKE_BIT_FD_ERROR, box->flags); if (WANT_EVENT (box, ERROR)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: error event on fd %d sent to %p\n", THR_NO, me->id, fd, box->ref_obj)); if (box->callback (box, PIKE_FD_ERROR) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } /* The following is temporary compat stuff. */ /* kqueue TODO: shouldn't need to do anything here for fs events, but should verify that. */ else if (old_events & PIKE_BIT_FD_READ) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: read_callback(%d, %p) for error %d\n", THR_NO, me->id, fd, box->ref_obj, err)); if (box->callback (box, PIKE_FD_READ) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } else if (old_events & PIKE_BIT_FD_WRITE) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: write_callback(%d, %p) for error %d\n", THR_NO, me->id, fd, box->ref_obj, err)); if (box->callback (box, PIKE_FD_WRITE) == -1) { CALL_AND_UNSET_ONERROR(uwp); goto backend_round_done; } } } CALL_AND_UNSET_ONERROR(uwp); } return 0; backend_round_done: return 1; } INIT { struct Backend_struct *me = THIS; me->id = unused_id++; IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: init\n", THR_NO, me->id)); #ifdef _REENTRANT THIS->set_busy = 0; co_init(&THIS->set_change); #endif /* _REENTRANT */ me->exec_thread = 0; me->backend_callbacks.callbacks=0; me->backend_callbacks.num_calls=0; INVALIDATE_CURRENT_TIME(); /* Why? /mast */ me->num_pending_calls=0; me->call_heap = 0; me->call_heap_size = 0; me->hash_size=0; me->hash_order=5; me->call_hash=0; me->backend_obj = Pike_fp->current_object; /* Note: Not refcounted. */ #ifdef PIKE_DEBUG me->inside_call_out=0; #endif me->fd_boxes=0; me->fd_boxes_start = me->fd_boxes_size = 0; me->inactive_boxes = me->free_inactive_box = NULL; me->inactive_boxes_size = 0; #ifdef PIKE_DEBUG me->debug_handler = NULL; #endif me->update_fd_set_handler = NULL; me->handler_data = me; /* Note that we can't hook the wakeup pipe * until we are fully initialized. * The actual hooking of the wakeup pipe * is therefore done in create() below. */ me->wakeup_pipe_send_fd = -1; INIT_FD_CALLBACK_BOX(&me->wakeup_cb_box, me, NULL, -1, PIKE_BIT_FD_READ, wakeup_callback, 0); me->may_need_wakeup = 0; #ifdef DO_PIKE_CLEANUP num_active_backends++; #endif } EXIT gc_trivial; { struct Backend_struct *me=THIS; int e; IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: exit\n", THR_NO, me->id)); free_callback_list(& THIS->backend_callbacks); if (THIS->wakeup_cb_box.fd >= 0) fd_close(THIS->wakeup_cb_box.fd); if (me->wakeup_pipe_send_fd >= 0) fd_close(THIS->wakeup_pipe_send_fd); if (me->fd_boxes) { FOR_EACH_ACTIVE_FD_BOX (me, box) { check_box (box, INT_MAX); #ifdef PIKE_DEBUG if (get_backend_for_fd (box->fd) != me) Pike_fatal ("Inconsistency in global fd map for fd %d: " "backend is %p, expected %p.\n", box->fd, get_backend_for_fd (box->fd), me); #endif if (box->callback == compat_box_dispatcher) { #ifdef PIKE_DEBUG fprintf (stderr, "[%d]BACKEND[%d]: " "Compat callbacks left at exit for fd %d: 0x%x\n", THR_NO, me->id, box->fd, box->events); #endif really_free_compat_cb_box ((struct compat_cb_box *) box); } if (box->backend) { box->backend = NULL; if (box->ref_obj && box->events) free_object (box->ref_obj); } } free(me->fd_boxes); me->fd_boxes = NULL; me->fd_boxes_start = me->fd_boxes_size = 0; } if (me->inactive_boxes) { FOR_EACH_INACTIVE_FD_BOX (me, box) { check_box (box, INT_MAX); #ifdef PIKE_DEBUG if (box->callback == compat_box_dispatcher) Pike_fatal ("Got inactive callback in compat interface.\n"); #endif if (box->backend) { box->backend = NULL; if (box->ref_obj && box->events) free_object (box->ref_obj); } } free(me->inactive_boxes); me->inactive_boxes = me->free_inactive_box = NULL; me->inactive_boxes_size = 0; } /* Make sure we aren't referenced any more. */ /* FIXME: Ought to keep better track of our fds so that we don't * need to do this loop. /mast */ for (e = 0; e < fd_map_size; e++) { if (fd_map[e] == me) fd_map[e] = NULL; } /* CALL OUT */ backend_verify_call_outs(me); for(e=0;e<me->num_pending_calls;e++) { CALL(e)->pos = -1; if (CALL(e)->this) free_object(CALL(e)->this); } me->num_pending_calls=0; if(me->call_heap) free((char*)me->call_heap); me->call_heap = NULL; if(me->call_hash) free((char*)me->call_hash); me->call_hash=NULL; #ifdef DO_PIKE_CLEANUP if (!--num_active_backends) backend_cleanup(); #endif } PIKEFUN void create() flags ID_PROTECTED; { struct Backend_struct *me = THIS; if (!me->update_fd_set_handler) { Pike_error("Attempt to clone the base Backend class.\n"); } if (me->wakeup_pipe_send_fd < 0) { int pipe[2]; IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: Creating wakeup pipe...\n", THR_NO, me->id)); if(pike_make_pipe(pipe) < 0) Pike_error("Couldn't create backend wakeup pipe! errno=%d.\n",errno); set_nonblocking(pipe[0],1); set_nonblocking(pipe[1],1); IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: Initializing wakeup pipe...\n", THR_NO, me->id)); change_fd_for_box (&me->wakeup_cb_box, pipe[0]); me->wakeup_pipe_send_fd = pipe[1]; IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: Wakeup pipe is [%d, %d]\n", THR_NO, me->id, me->wakeup_pipe_send_fd, THIS->wakeup_cb_box.fd)); /* Don't keep these on exec! */ set_close_on_exec(pipe[0], 1); set_close_on_exec(pipe[1], 1); } } } /*! @endclass */ /* * POLL/SELECT selection */ #ifndef HAVE_AND_USE_POLL /* Various BSDs have simulated poll(2) APIs. */ #undef HAVE_POLL #endif /* #undef BACKEND_USES_DEVPOLL */ /* #undef BACKEND_USES_DEVEPOLL */ /* #undef BACKEND_USES_POLL_DEVICE */ #ifdef HAVE_POLL /* * Backends using poll(2) or similar. */ /* Some constants... */ /* Notes on POLLRDNORM and POLLIN: * * According to the AIX manual, POLLIN and POLLRDNORM are both set * if there's a nonpriority message on the read queue. POLLIN is * also set if the message is of 0 length. */ #ifndef POLLRDNORM #define POLLRDNORM POLLIN #endif /* !POLLRDNORM */ #ifndef POLLRDBAND #define POLLRDBAND POLLPRI #endif /* !POLLRDBAND */ #ifndef POLLWRNORM #define POLLWRNORM POLLOUT #endif /* POLLWRNORM */ #ifndef POLLWRBAND #define POLLWRBAND POLLOUT #endif /* !POLLWRBAND */ #define MY_POLLIN POLLRDNORM|POLLIN #define MY_POLLOUT POLLWRNORM|POLLOUT #define MY_POLLEXCEPT POLLRDBAND|POLLRDNORM|POLLIN #define MY_POLLRDBAND POLLRDBAND|POLLPRI #define MY_POLLWREXCEPT POLLWRBAND|POLLWRNORM|POLLOUT #define MY_POLLWRBAND POLLWRBAND|MY_POLLOUT #define MY_POLLNVAL POLLNVAL #if (POLLRDBAND != POLLRDNORM) && (POLLRDBAND != POLLIN) #define RDBAND_IS_SPECIAL #endif #if (POLLWRBAND != POLLOUT) && (POLLWRBAND != POLLWRNORM) #define WRBAND_IS_SPECIAL #endif #define TIMEOUT_IS_MILLISECONDS #ifdef BACKEND_USES_DEVPOLL /* * Backend using /dev/poll-style poll device. * * Used on: * Solaris 7 + patches and above. * OSF/1 + patches and above. * IRIX 5.6.15m and above. */ #define POLL_EVENT struct pollfd #define OPEN_POLL_DEVICE(X) open(PIKE_POLL_DEVICE, O_RDWR) #define CHILD_NEEDS_TO_REOPEN #define DECLARE_POLL_EXTRAS \ POLL_EVENT poll_fds[POLL_SET_SIZE]; \ struct dvpoll poll_request = { \ poll_fds, \ POLL_SET_SIZE, \ 0, \ } #define PDB_POLL(PFD, TIMEOUT) \ ((poll_request.dp_timeout = (TIMEOUT)), \ (ioctl(PFD, DP_POLL, &poll_request, sizeof(poll_request)))) int POLL_DEVICE_SET_EVENTS(struct Backend_struct *me, int pfd, int fd, INT32 events) { struct pollfd poll_state[2]; int e; int sz = sizeof(poll_state); IF_PD(fprintf(stderr, "POLL_DEVICE_SET_EVENTS(%p, %d, %d, 0x%08x)\n", me, pfd, fd, events)); /* NOTE: POLLREMOVE must (unfortunately) be a separate request. */ poll_state[0].fd = fd; poll_state[0].events = POLLREMOVE; poll_state[0].revents = 0; poll_state[1].fd = fd; poll_state[1].events = events; poll_state[1].revents = 0; if (!events) { /* We're not interrested in the fd anymore. */ sz = sizeof(poll_state[0]); } #ifdef _REENTRANT /* FIXME: Ought to check if we're the backend. */ if(num_threads>1) { /* Release the poll set from the backend. */ IF_PD(fprintf(stderr, "POLL_DEVICE_SET_EVENTS[%p] grabbing the poll set\n", me)); while (me->set_busy) { co_wait_interpreter(&me->set_change); } me->set_busy = 1; IF_PD(fprintf(stderr, "POLL_DEVICE_SET_EVENTS[%p] wake up backend\n", me)); backend_wake_up_backend(me); /* The backend is now waiting in wakeup_callback(). */ } #endif /* _REENTRANT */ IF_PD(fprintf(stderr, "POLL_DEVICE_SET_EVENTS[%p] updating the poll set\n", me)); while (((e = write(pfd, poll_state, sz)) < 0) && (errno == EINTR)) ; #ifdef _REENTRANT me->set_busy = 0; if(num_threads>1) { /* Release the backend from wakeup_callback(). */ IF_PD(fprintf(stderr, "POLL_DEVICE_SET_EVENTS[%p] releasing the backend\n", me)); co_broadcast(&me->set_change); } #endif /* _REENTRANT */ if (e < 0) { Pike_fatal("Failed to set state for fd %d in " PIKE_POLL_DEVICE " (errno:%d).\n", fd, errno); } /* FIXME: Probably ought to support partial writes. */ if (e != sz) { Pike_fatal("Failed to set state for fd %d in " PIKE_POLL_DEVICE " short write (%d != %d).\n", fd, e, (int)sizeof(poll_state)); } IF_PD(fprintf(stderr, "POLL_DEVICE_SET_EVENTS[%p] ==> %d\n", me, e)); return e; } #elif defined(BACKEND_USES_DEVEPOLL) /* * Backend using /dev/epoll-style poll device. * * Used on: * Linux 2.6 and above. * Note: * Some libc's are missing wrappers for the system calls, so * we include the appropriate wrappers below. */ #ifndef PIKE_POLL_DEVICE #define PIKE_POLL_DEVICE "epoll" #endif /* The following three are defined by <gnu/stubs.h> which is included * from <features.h> which is included from just about everywhere, so * it is safe to assume that they have been defined if appropriate. */ #if defined(__stub_epoll_create) || defined(__stub_epoll_ctl) || \ defined(__stub_epoll_wait) /* We have a libc without the wrappers for epoll support. */ #ifndef __NR_epoll_create /* Our libc doesn't even know the syscall numbers for the epoll syscalls. */ #ifdef __i386__ #define __NR_epoll_create 254 #define __NR_epoll_ctl 255 #define __NR_epoll_wait 256 #elif defined(__ia64__) #define __NR_epoll_create 1243 #define __NR_epoll_ctl 1244 #define __NR_epoll_wait 1245 #elif defined(__x86_64__) #define __NR_epoll_create 214 #define __NR_epoll_ctl 233 #define __NR_epoll_wait 232 #else /* cpu types */ #error Syscall numbers for epoll_create et al not known on this architecture. #endif /* cpu types */ #endif /* !defined(__NR_epoll_create) */ #if defined(_syscall1) && defined(_syscall4) _syscall1(int, epoll_create, int, size); _syscall4(int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event); _syscall4(int, epoll_wait, int, epfd, struct epoll_event *, pevents, int, maxevents, int, timeout); #undef __stub_epoll_create #undef __stub_epoll_ctl #undef __stub_epoll_wait #else /* !_syscall1 || !_syscall4 */ #error Missing macros for generation of syscall wrappers. #endif /* _syscall1 && _syscall4 */ #endif /* __stub_epoll_{create, ctl, wait} */ #define POLL_EVENT struct epoll_event #define PDB_GET_FD(EVENT) EVENT.data.fd #define PDB_GET_EVENTS(EVENT) EVENT.events /* FIXME: Might want another value instead on POLL_SET_SIZE. */ #define OPEN_POLL_DEVICE(X) epoll_create(POLL_SET_SIZE) #define DECLARE_POLL_EXTRAS \ POLL_EVENT poll_fds[POLL_SET_SIZE] #define PDB_POLL(PFD, TIMEOUT) \ epoll_wait(PFD, poll_fds, POLL_SET_SIZE, TIMEOUT) int POLL_DEVICE_SET_EVENTS(struct Backend_struct *me, int pfd, int fd, INT32 events) { int e; if (events) { struct epoll_event ev; #ifdef __CHECKER__ MEMSET(&ev, 0, sizeof(ev)); #endif ev.events = events; ev.data.fd = fd; /* To avoid valgrind complaints when fd doesn't fill up the * ev.data union. */ PIKE_MEM_RW (ev.data); /* The /dev/epoll interface exposes kernel implementation details... */ IF_PD(fprintf(stderr, "epoll_ctl(%d, EPOLL_CTL_MOD, %d, { 0x%08x, %d })\n", pfd, fd, events, fd)); while (((e = epoll_ctl(pfd, EPOLL_CTL_MOD, fd, &ev)) < 0) && (errno == EINTR)) ; if ((e < 0) && (errno == ENOENT)) { IF_PD(fprintf(stderr, "epoll_ctl(%d, EPOLL_CTL_ADD, %d, { 0x%08x, %d })\n", pfd, fd, events, fd)); while (((e = epoll_ctl(pfd, EPOLL_CTL_ADD, fd, &ev)) < 0) && (errno == EINTR)) ; } } else { struct epoll_event dummy; /* The last argument must be a proper struct pointer even * though it isn't used... */ PIKE_MEM_RW (dummy); IF_PD(fprintf(stderr, "epoll_ctl(%d, EPOLL_CTL_DEL, %d, &dummy)\n", pfd, fd)); while (((e = epoll_ctl(pfd, EPOLL_CTL_DEL, fd, &dummy)) < 0) && (errno == EINTR)) ; if ((e < 0) && (errno == ENOENT)) return 0; } IF_PD(if (e < 0) { fprintf(stderr, "epoll_ctl() failed with errno: %d\n", errno); }); return e; } #endif /* HAVE_SYS_DEVPOLL_H || HAVE_SYS_EPOLL_H */ #ifdef HAVE_POLL /* * Backend using poll(2). * * This is used on most older SVR4- or POSIX-style systems. */ #define PB_POLL(SET, TIMEOUT) \ poll((SET).poll_fds, (SET).num_in_poll, (TIMEOUT)) struct pb_selectors { struct pollfd *poll_fds; int poll_fd_size; int num_in_poll; }; static void pb_MY_FD_SET(struct pb_selectors *me, int fd, int add) { int i; IF_PD(fprintf(stderr, "BACKEND: MY_FD_SET(%d, 0x%04x)\n", fd, add)); for(i=0; i<me->num_in_poll; i++) { if(me->poll_fds[i].fd == fd) { me->poll_fds[i].events |= add; return; } } me->num_in_poll++; if (me->num_in_poll > me->poll_fd_size) { me->poll_fd_size += me->num_in_poll; /* Usually a doubling */ if (me->poll_fds) { me->poll_fds = realloc(me->poll_fds, sizeof(struct pollfd)*me->poll_fd_size); } else { me->poll_fds = malloc(sizeof(struct pollfd)*me->poll_fd_size); } if (!me->poll_fds) { Pike_fatal("Out of memory in backend::MY_FD_SET()\n" "Tried to allocate %d pollfds\n", me->poll_fd_size); } } me->poll_fds[me->num_in_poll-1].fd = fd; me->poll_fds[me->num_in_poll-1].events = add; } static void pb_MY_FD_CLR(struct pb_selectors *me, int fd, int sub) { int i; IF_PD(fprintf(stderr, "BACKEND: POLL_FD_CLR(%d, 0x%04x)\n", fd, sub)); if(!me->poll_fds) return; for(i=0; i<me->num_in_poll; i++) { if(me->poll_fds[i].fd == fd) { me->poll_fds[i].events &= ~sub; if(!me->poll_fds[i].events) { /* Note that num_in_poll is decreased here. * This is to avoid a lot of -1's below. * /grubba */ me->num_in_poll--; if(i != me->num_in_poll) { me->poll_fds[i] = me->poll_fds[me->num_in_poll]; } /* Might want to shrink poll_fds here, but probably not. */ } break; } } } static void pb_copy_selectors(struct pb_selectors *to, struct pb_selectors *from) { IF_PD(fprintf(stderr, "BACKEND: copy_poll_set() from->num_in_poll=%d\n", from->num_in_poll)); if (to->poll_fd_size < from->num_in_poll) { IF_PD(fprintf(stderr, "BACKEND: copy_poll_set() size %d -> %d\n", to->poll_fd_size, from->poll_fd_size)); to->poll_fd_size=from->poll_fd_size; if (to->poll_fds) { to->poll_fds = realloc(to->poll_fds, sizeof(struct pollfd)*to->poll_fd_size); } else { to->poll_fds = malloc(sizeof(struct pollfd)*to->poll_fd_size); } if (!to->poll_fds) { Pike_fatal("Out of memory in backend::copy_poll_set()\n" "Tried to allocate %d pollfds\n", to->poll_fd_size); } } MEMCPY(to->poll_fds, from->poll_fds, sizeof(struct pollfd)*from->num_in_poll); to->num_in_poll=from->num_in_poll; } #endif /* HAVE_POLL */ #define PB_GET_FD(EVENT) EVENT.fd #ifndef PDB_GET_FD #define PDB_GET_FD(EVENT) PB_GET_FD(EVENT) #endif #define PB_GET_EVENTS(EVENT) EVENT.revents #ifndef PDB_GET_EVENTS #define PDB_GET_EVENTS(EVENT) PB_GET_EVENTS(EVENT) #endif #ifndef PDB_GET_FLAGS #define PDB_GET_FLAGS(EVENT) 0 #endif #elif defined(BACKEND_USES_KQUEUE) /* * Backend using kqueue-style poll device. * * FIXME: Not fully implemented yet! Out of band data handling is missing. * * Used on * FreeBSD 4.1 and above. * MacOS X/Darwin 7.x and above. * Various other BSDs. */ #define POLL_EVENT struct kevent #if defined(BACKEND_USES_CFRUNLOOP) #define OPEN_POLL_DEVICE(X) my_kqueue(X) #else #define OPEN_POLL_DEVICE(X) kqueue() #endif #define CHILD_NEEDS_TO_REOPEN #define PIKE_POLL_DEVICE "kqueue" #define TIMEOUT_IS_TIMESPEC #define MY_POLLIN EVFILT_READ #define MY_POLLOUT EVFILT_WRITE /* NOTE: The following 4 event types are specific to kqueue(2) */ #define MY_POLLFSEVENT EVFILT_VNODE #define MY_POLLPROCESS EVFILT_PROC #define MY_POLLSIGNAL EVFILT_SIGNAL #define MY_POLLTIMER EVFILT_TIMER #define MY_POLLERR EV_ERROR #if 0 #define MY_POLLHUP EV_EOF #else /* !0 */ #define MY_POLLHUP 0 #endif /* 0 */ /* FIXME: The kqueue API has no documented support for out of band data. */ #define MY_POLLEXCEPT EVFILT_READ #define MY_POLLRDBAND EVFILT_READ #define MY_POLLWREXCEPT EVFILT_WRITE #define MY_POLLWRBAND EVFILT_WRITE #define DECLARE_POLL_EXTRAS \ POLL_EVENT poll_fds[POLL_SET_SIZE] #define PDB_POLL(SET, TIMEOUT) \ kevent((SET), NULL, 0, poll_fds, POLL_SET_SIZE, &(TIMEOUT)) #define PDB_GET_FD(EVENT) EVENT.ident #define PDB_GET_EVENTS(EVENT) EVENT.filter #define PDB_GET_FLAGS(EVENT) EVENT.fflags #define PDB_CHECK_EVENT(EVENT, MASK) (PDB_GET_EVENTS(EVENT) == (MASK)) /* NOTE: Error events are signalled in the flags field. They thus * must be checked for before the ordinary events. */ #define PDB_CHECK_ERROR_EVENT(EVENT, MASK) (EVENT.flags & (MASK)) int pdb_MY_FD_CLR(int *pfd, int fd, int filter) { struct kevent ev; /* Note: Use EV_DISABLE in preference to EV_DELETE, since * odds are that the fd will be reenabled, and the * filter is deleted anyway when the fd is closed. */ EV_SET(&ev, fd, filter, EV_DISABLE, 0, 0, 0); return kevent(*pfd, &ev, 1, NULL, 0, NULL); } #define pdb_MY_FD_SET(PFD, FD, FILTER) pdb_MY_FD_SET2(PFD, FD, FILTER, 0) int pdb_MY_FD_SET2(int *pfd, int fd, int filter, int fflags) { struct kevent ev[2]; /* VNODE filters seem to need ONESHOT mode, else they just repeat endlessly. */ if(filter == EVFILT_VNODE) EV_SET(ev, fd, filter, EV_ADD|EV_ENABLE|EV_CLEAR, fflags, 0, 0); else EV_SET(ev, fd, filter, EV_ADD|EV_ENABLE, fflags, 0, 0); return kevent(*pfd, ev, 2, NULL, 0, NULL); } #define pdb_MY_FD_CLR_RDBAND(SET, FD) #define pdb_MY_FD_CLR_WRBAND(SET, FD) #endif /* * Backend using select(2) * * This is used on most older BSD-style systems, and WIN32. */ #define MY_READSET 0 #define MY_WRITESET 1 #define MY_EXCEPTSET 2 /* except == incoming OOB data (or error according to POSIX) * outgoing OOB data is multiplexed on write */ struct sb_selectors { int max_fd; my_fd_set sets[3]; }; struct sb_active_selectors { fd_set asets[3]; int max_fd; }; #define SB_SELECT(SET, TIMEOUT) \ fd_select((SET).max_fd + 1, \ (SET).asets + MY_READSET, \ (SET).asets + MY_WRITESET, \ (SET).asets + MY_EXCEPTSET, \ (TIMEOUT).tv_sec >= 100000000 ? NULL : &(TIMEOUT)) void sb_MY_FD_CLR(struct sb_selectors *me, int fd, int setno) { if(fd > me->max_fd) return; my_FD_CLR(fd, me->sets + setno); if(fd == me->max_fd) { while(me->max_fd >=0 && !my_FD_ISSET(me->max_fd, me->sets + MY_READSET) && !my_FD_ISSET(me->max_fd, me->sets + MY_WRITESET) && !my_FD_ISSET(me->max_fd, me->sets + MY_EXCEPTSET) ) me->max_fd--; } } void sb_MY_FD_SET(struct sb_selectors *me, int fd, int setno) { my_FD_SET(fd, me->sets + setno); if(fd > me->max_fd) me->max_fd=fd; } static void sb_copy_selectors(struct sb_active_selectors *to, struct sb_selectors *from) { fd_copy_my_fd_set_to_fd_set(to->asets + MY_READSET, from->sets + MY_READSET, from->max_fd+1); fd_copy_my_fd_set_to_fd_set(to->asets + MY_WRITESET, from->sets + MY_WRITESET, from->max_fd+1); fd_copy_my_fd_set_to_fd_set(to->asets + MY_EXCEPTSET, from->sets + MY_EXCEPTSET, from->max_fd+1); to->max_fd=from->max_fd; } #ifndef POLL_SET_SIZE #define POLL_SET_SIZE 32 #endif /* !POLL_SET_SIZE */ #define PB_CHECK_EVENT(EVENT, MASK) (PB_GET_EVENTS(EVENT) & (MASK)) #ifndef PDB_CHECK_EVENT #define PDB_CHECK_EVENT(EVENT, MASK) (PDB_GET_EVENTS(EVENT) & (MASK)) #endif /* PB_CHECK_EVENT */ #define PB_CHECK_ERROR_EVENT(EVENT, MASK) PB_CHECK_EVENT(EVENT, MASK) #ifndef PDB_CHECK_ERROR_EVENT #define PDB_CHECK_ERROR_EVENT(EVENT, MASK) PDB_CHECK_EVENT(EVENT, MASK) #endif /* PB_CHECK_ERROR_EVENT */ #ifdef RBBAND_IS_SPECIAL # define pb_MY_FD_CLR_RDBAND(SET, FD) pb_MY_FD_CLR (SET, FD, MY_POLLRDBAND) #else # define pb_MY_FD_CLR_RDBAND(SET, FD) #endif #ifdef WRBAND_IS_SPECIAL # define pb_MY_FD_CLR_WRBAND(SET, FD) pb_MY_FD_CLR (SET, FD, MY_POLLWRBAND) #else # define pb_MY_FD_CLR_WRBAND(SET, FD) #endif #ifndef MY_POLLERR #define MY_POLLERR POLLERR #endif #ifndef MY_POLLHUP #define MY_POLLHUP POLLHUP #endif #ifndef MY_POLLFSEVENT #define MY_POLLFSEVENT 0 #endif #ifndef MY_POLLSIGNAL #define MY_POLLSIGNAL 0 #endif #if defined(BACKEND_USES_POLL_DEVICE) || defined(BACKEND_USES_KQUEUE) /*! @class PollDeviceBackend *! @inherit __Backend *! *! @[Backend] implemented with @tt{/dev/poll@} (Solaris, OSF/1 and IRIX), *! @tt{epoll(2)@} (Linux) or @tt{kqueue(2)@} (MacOS X, FreeBSD, OpenBSD, etc). *! *! @seealso *! @[Backend] */ PIKECLASS PollDeviceBackend { INHERIT Backend; /* Helpers to find the above inherit. */ static ptrdiff_t pdb_offset = 0; CVAR struct Backend_struct *backend; /* * POLL/SELECT fd sets */ CVAR int set; #if defined(BACKEND_USES_CFRUNLOOP) CVAR int go_cf; CVAR CFFileDescriptorRef fdref; CVAR CFRunLoopSourceRef source; CVAR int event_count; #endif /* BACKEND_USES_CFRUNLOOP */ #ifdef DECLARE_POLL_EXTRAS /* Declare any extra variables needed by MY_POLL(). */ CVAR struct kevent* poll_fds; #endif /* DECLARE_POLL_EXTRAS */ DECLARE_STORAGE PIKEFUN void set_signal_event_callback(int signum, function cb) { int q; #ifdef BACKEND_USES_KQUEUE struct kevent ev[2]; EV_SET(ev, signum, MY_POLLSIGNAL, EV_ADD, 0, 0, 0); q = kevent(THIS->set, ev, 1, NULL, 0, NULL); #endif pop_n_elems(args); } /* * FD set handling */ static void pdb_UPDATE_BLACK_BOX(struct PollDeviceBackend_struct *me, int fd, int wanted_events) { #ifdef BACKEND_USES_POLL_DEVICE INT32 events = 0; if (wanted_events & PIKE_BIT_FD_READ) { events |= MY_POLLIN; } if (wanted_events & PIKE_BIT_FD_WRITE) { events |= MY_POLLOUT; } if (wanted_events & PIKE_BIT_FD_READ_OOB) { events |= MY_POLLRDBAND; } if (wanted_events & PIKE_BIT_FD_WRITE_OOB) { events |= MY_POLLWRBAND; } if (wanted_events & PIKE_BIT_FD_FS_EVENT) { events |= MY_POLLFSEVENT; } IF_PD(fprintf(stderr, "UPDATE_BLACK_BOX(%d, %d) ==> events: 0x%08x\n", me->set, fd, events)); POLL_DEVICE_SET_EVENTS(me->backend, me->set, fd, events); #elif defined(BACKEND_USES_KQUEUE) /* Note: Only used by REOPEN_POLL_DEVICE on a freshly opened kqueue. */ struct kevent ev[2]; int nev = 0; if (wanted_events & PIKE_BIT_FD_READ || wanted_events & PIKE_BIT_FD_READ_OOB) { EV_SET(ev, fd, MY_POLLIN, EV_ADD, 0, 0, 0); nev++; } if (wanted_events & PIKE_BIT_FD_WRITE || wanted_events & PIKE_BIT_FD_WRITE_OOB) { EV_SET(ev, fd, MY_POLLOUT, EV_ADD, 0, 0, 0); nev++; } if (wanted_events & PIKE_BIT_FD_FS_EVENT) { // kqueue TODO generate fflags from the high bits of the wanted_events argument. EV_SET(ev, fd, MY_POLLFSEVENT, EV_ADD, 0, 0, 0); nev++; } if (nev) kevent(me->set, ev, nev, NULL, 0, NULL); #endif /* BACKEND_USES_POLL_DEVICE */ } #if defined(BACKEND_USES_CFRUNLOOP) /* we place this declaration here rather than at the top in order to avoid struct-y unpleasantness */ int init_cf(struct PollDeviceBackend_struct *me, int i); int my_kqueue(struct PollDeviceBackend_struct *me) { int i; i = kqueue(); if(me->go_cf) return init_cf(me, i); else return i; } int init_cf(struct PollDeviceBackend_struct *me, int i) { CFFileDescriptorContext context = {0, me, NULL, NULL, NULL}; me->fdref = CFFileDescriptorCreate(kCFAllocatorDefault, i, true, noteEvents, &context); CFRetain(me->fdref); me->source = CFFileDescriptorCreateRunLoopSource(kCFAllocatorDefault, me->fdref, 0); CFFileDescriptorEnableCallBacks(me->fdref, kCFFileDescriptorReadCallBack); CFRetain(me->source); return i; } void exit_cf(struct PollDeviceBackend_struct *me) { if(me->source) { CFRunLoopSourceInvalidate(me->source); CFRelease(me->source); } if(me->fdref) CFRelease(me->fdref); } #endif /* BACKEND_USES_CFRUNLOOP */ /* This is called in the child process to restore * poll state after fork() in case of detaching. */ static void pdb_REOPEN_POLL_DEVICE(struct PollDeviceBackend_struct *me) { int fd; while ((close(me->set) < 0) && (errno == EINTR)) ; while (((fd = OPEN_POLL_DEVICE(me)) < 0) && (errno == EINTR)) ; if (fd < 0) { Pike_fatal("Failed to reopen " PIKE_POLL_DEVICE " after fork (errno: %d).\n", errno); } if (fd != me->set) { int e; while (((e = dup2(fd, me->set)) < 0) && (errno == EINTR)) ; if (e < 0) { /* We hope we can use the fd at the new location... */ me->set = fd; } else { while ((close(fd) < 0) && (errno == EINTR)) ; } } set_close_on_exec(me->set, 1); /* Restore the poll-state for all the fds. */ {FOR_EACH_ACTIVE_FD_BOX (me->backend, box) { pdb_UPDATE_BLACK_BOX (me, box->fd, box->events); }} } #if defined(BACKEND_USES_CFRUNLOOP) static void noteEvents(CFFileDescriptorRef fdref, CFOptionFlags UNUSED(callBackTypes), void *info) { struct kevent kev; struct timespec tv; struct PollDeviceBackend_struct * this_backend; int fd; tv.tv_sec = 0; tv.tv_nsec = 0; this_backend = (struct PollDeviceBackend_struct *)info; fd = CFFileDescriptorGetNativeDescriptor(fdref); kevent(fd, NULL, 0, this_backend->poll_fds, POLL_SET_SIZE, &tv); this_backend->event_count = POLL_SET_SIZE; } #endif /* BACKEND_USES_CFRUNLOOP */ static struct PollDeviceBackend_struct **pdb_backends = NULL; static int num_pdb_backends = 0; static int pdb_backends_size = 0; /* Called from the init callback. */ static void register_pdb_backend(struct PollDeviceBackend_struct *me) { if (num_pdb_backends == pdb_backends_size) { struct PollDeviceBackend_struct **new_backends = realloc(pdb_backends, (pdb_backends_size+1) * sizeof(struct PollDeviceBackend_struct *)*2); if (!new_backends) { Pike_error("Out of memory.\n"); } pdb_backends = new_backends; pdb_backends_size = (pdb_backends_size+1)*2; } pdb_backends[num_pdb_backends++] = me; } /* Called from the exit callback. */ static void unregister_pdb_backend(struct PollDeviceBackend_struct *me) { int i = num_pdb_backends; /* Search backwards since new backends are more likely to be destructed * than old backends. */ while (i--) { if (pdb_backends[i] == me) { pdb_backends[i] = pdb_backends[--num_pdb_backends]; pdb_backends[num_pdb_backends] = NULL; return; /* A backend is only supposed to be registered once. */ } } } /* Called in the child after fork(). */ static void reopen_all_pdb_backends(struct callback *UNUSED(cb), void *UNUSED(a), void *UNUSED(b)) { int i; for (i=0; i < num_pdb_backends; i++) { pdb_REOPEN_POLL_DEVICE(pdb_backends[i]); } } static void pdb_update_fd_set(struct Backend_struct *me, struct PollDeviceBackend_struct *pdb, int fd, int old_events, int new_events, int flags) { int changed_events = old_events ^ new_events; IF_PD(fprintf (stderr, "[%d]BACKEND[%d]: pdb_update_fd_set(.., %d, %d, %d, %d):\n", THR_NO, me->id, fd, old_events, new_events, flags)); if (changed_events) { #ifdef BACKEND_USES_POLL_DEVICE pdb_UPDATE_BLACK_BOX(pdb, fd, new_events); #else /* !BACKEND_USES_POLL_DEVICE */ if (changed_events & PIKE_BIT_FD_READ) { if (new_events & PIKE_BIT_FD_READ) { pdb_MY_FD_SET(&pdb->set, fd, MY_POLLIN); /* Got to enable the exception set to get errors (at least * according to POSIX). */ pdb_MY_FD_SET(&pdb->set, fd, MY_POLLEXCEPT); } else { pdb_MY_FD_CLR(&pdb->set, fd, MY_POLLIN); if (!(new_events & PIKE_BIT_FD_READ_OOB) && !(new_events & PIKE_BIT_FD_WRITE)) /* Exceptions might cause calls to read, read_oob and write. */ pdb_MY_FD_CLR(&pdb->set, fd, MY_POLLEXCEPT); } } if (changed_events & PIKE_BIT_FD_READ_OOB) { if (new_events & PIKE_BIT_FD_READ_OOB) pdb_MY_FD_SET(&pdb->set, fd, MY_POLLRDBAND); else { if (!(new_events & PIKE_BIT_FD_READ)) { if (!(new_events & PIKE_BIT_FD_WRITE)) /* Exceptions might cause calls to read, read_oob and write. */ pdb_MY_FD_CLR(&pdb->set, fd, MY_POLLEXCEPT); } else { pdb_MY_FD_CLR_RDBAND(&pdb->set, fd); } } } if (changed_events & PIKE_BIT_FD_WRITE) { if (new_events & PIKE_BIT_FD_WRITE) { pdb_MY_FD_SET(&pdb->set, fd, MY_POLLOUT); /* Got to enable the exception set to get errors (at least * according to POSIX). */ pdb_MY_FD_SET(&pdb->set, fd, MY_POLLEXCEPT); } else { if (!(new_events & PIKE_BIT_FD_WRITE_OOB)) { pdb_MY_FD_CLR(&pdb->set, fd, MY_POLLOUT); if (!(new_events & PIKE_BIT_FD_READ) && !(new_events & PIKE_BIT_FD_READ_OOB)) /* Exceptions might cause calls to read, read_oob and write. */ pdb_MY_FD_CLR(&pdb->set, fd, MY_POLLEXCEPT); } } } if (changed_events & PIKE_BIT_FD_WRITE_OOB) { if (new_events & PIKE_BIT_FD_WRITE_OOB) pdb_MY_FD_SET(&pdb->set, fd, MY_POLLWRBAND); else { if (!(new_events & PIKE_BIT_FD_WRITE)) { pdb_MY_FD_CLR(&pdb->set, fd, MY_POLLWREXCEPT); } else { pdb_MY_FD_CLR_WRBAND(&pdb->set, fd); } } } // TODO kqueue ADD fflags if (changed_events & PIKE_BIT_FD_FS_EVENT) { if (new_events & PIKE_BIT_FD_FS_EVENT) pdb_MY_FD_SET2(&pdb->set, fd, MY_POLLFSEVENT, flags); else { pdb_MY_FD_CLR(&pdb->set, fd, MY_POLLFSEVENT); } } #endif /* !BACKEND_USES_POLL_DEVICE */ if (new_events & ~old_events) /* New events were added. */ backend_wake_up_backend(me); } } /* Mapping of events to flags and callbacks. * * Event select poll kqueue callback * * data_in read POLLIN EVFILT_READ READ * POLLRDNORM EVFILT_READ[EOF] * * data_out write POLLOUT EVFILT_WRITE WRITE * POLLWRNORM * * oob_in except POLLPRI (EVFILT_READ) READ_OOB * POLLRDBAND * * oob_out write POLLWRBAND (EVFILT_WRITE) WRITE_OOB * * close_in read POLLIN EVFILT_READ[EOF] READ * POLLHUP(Linux pipe) * * close_out write POLLHUP EVFILT_WRITE[EOF] WRITE * POLLERR(Linux pipe) >WRITE_OOB * * conn_ok write POLLOUT EVFILT_WRITE WRITE * * conn_fail read POLLIN EVFILT_READ[EOF] READ * except (READ_OOB) * * new_conn read POLLIN EVFILT_READ READ * * sock_err except POLLERR EVFILT_READ[ERR] ERROR * >READ * * sock_err except POLLERR EVFILT_WRITE[ERR] ERROR * >WRITE */ #ifdef POLL_DEBUG static void pdb_describe_event(struct Backend_struct *me, POLL_EVENT event) { #ifdef BACKEND_USES_KQUEUE fprintf(stderr, "[%d]BACKEND[%d]: fd:%d filter:%d flags:0x%08x", THR_NO, me->id, PDB_GET_FD(event), PDB_GET_EVENTS(event), event.flags); if (PDB_CHECK_EVENT(event, MY_POLLIN)) { fprintf(stderr, " EVFILT_READ"); } else if (PDB_CHECK_EVENT(event, MY_POLLOUT)) { fprintf(stderr, " EVFILT_WRITE"); } else if (PDB_CHECK_EVENT(event, MY_POLLFSEVENT)) { fprintf(stderr, " POLLFSEVENT"); } else { fprintf(stderr, " UNKNOWN"); } if (event.flags & EV_ERROR) { fprintf(stderr, "[ERROR]"); } if (event.flags & EV_EOF) { fprintf(stderr, "[EOF]"); } fprintf(stderr, "(%d)\n", event.data); #else /* !BACKEND_USES_KQUEUE */ fprintf(stderr, "[%d]BACKEND[%d]: fd:%d events:0x%04x", THR_NO, me->id, PDB_GET_FD(event), PDB_GET_EVENTS(event)); if (PDB_CHECK_EVENT(event, MY_POLLNVAL)) { fprintf(stderr, " POLLNVAL"); } if (PDB_CHECK_EVENT(event, MY_POLLERR)) { fprintf(stderr, " POLLERR"); } if (PDB_CHECK_EVENT(event, MY_POLLHUP)) { fprintf(stderr, " POLLHUP"); } if (PDB_CHECK_EVENT(event, MY_POLLRDBAND)) { fprintf(stderr, " POLLRDBAND"); } if (PDB_CHECK_EVENT(event, MY_POLLIN)) { fprintf(stderr, " POLLIN"); } if (PDB_CHECK_EVENT(event, MY_POLLWRBAND)) { fprintf(stderr, " POLLWRBAND"); } if (PDB_CHECK_EVENT(event, MY_POLLOUT)) { fprintf(stderr, " POLLOUT"); } fprintf(stderr, "\n"); #endif /* BACKEND_USES_KQUEUE */ } #else /* !POLL_DEBUG */ #define pdb_describe_event(BACKEND, EVENT) #endif /* POLL_DEBUG */ /* A negative tv_sec in timeout turns it off. If it ran until the * timeout without calling any callbacks or call outs (except those * on backend_callbacks) then tv_sec will be set to -1. Otherwise it * will be set to the time spent. */ static void pdb_low_backend_once(struct PollDeviceBackend_struct *pdb, struct timeval *timeout) { ONERROR uwp; int i, done_something = 0; struct timeval start_time = *timeout; struct Backend_struct *me = pdb->backend; #ifdef DECLARE_POLL_EXTRAS /* Declare any extra variables needed by MY_POLL(). */ DECLARE_POLL_EXTRAS; #endif /* DECLARE_POLL_EXTRAS */ SET_ONERROR(uwp, low_backend_cleanup, THIS->backend); low_backend_once_setup(pdb->backend, &start_time); if (TYPEOF(me->before_callback) != T_INT) call_backend_monitor_cb (me, &me->before_callback); { #ifdef BACKEND_USES_CFRUNLOOP double cf_timeout; #endif /* BACKEND_USES_CFRUNLOOP */ #ifdef TIMEOUT_IS_MILLISECONDS int poll_timeout; #elif defined(TIMEOUT_IS_TIMEVAL) struct timeval poll_timeout; #elif defined(TIMEOUT_IS_TIMESPEC) struct timespec poll_timeout; #else #error Unknown timeout method. #endif /* TIMEOUT_IS_* */ struct timeval *next_timeout = &pdb->backend->next_timeout; me->may_need_wakeup = 1; #ifdef TIMEOUT_IS_MILLISECONDS if (next_timeout->tv_sec >= 100000000) /* Take this as waiting forever. */ poll_timeout = -1; else if(next_timeout->tv_sec < 0) poll_timeout = 0; else if(next_timeout->tv_sec > (INT_MAX/1002)) /* about 24 days.*/ poll_timeout = INT_MAX/1002; else poll_timeout = MAXIMUM((next_timeout->tv_sec*1000) + next_timeout->tv_usec/1000,2); #elif defined(TIMEOUT_IS_TIMEVAL) poll_timeout = *next_timeout; #elif defined(TIMEOUT_IS_TIMESPEC) poll_timeout.tv_sec = next_timeout->tv_sec; poll_timeout.tv_nsec = next_timeout->tv_usec*1000; #else #error Unknown timeout method. #endif /* TIMEOUT_IS_* */ IF_PD(fprintf (stderr, "[%d]BACKEND[%d]: Doing poll on fds:\n", THR_NO, me->id)); check_threads_etc(); THREADS_ALLOW(); /* Note: The arguments to MY_POLL may be evaluated multiple times. */ #ifdef BACKEND_USES_CFRUNLOOP if(pdb->go_cf) { cf_timeout = next_timeout->tv_sec + (next_timeout->tv_usec / 1000000.0); pdb->event_count = 0; pdb->poll_fds = (poll_fds); CFFileDescriptorEnableCallBacks(pdb->fdref, kCFFileDescriptorReadCallBack); CFRunLoopAddSource(CFRunLoopGetCurrent(), pdb->source, kCFRunLoopDefaultMode); CFRunLoopRunInMode(kCFRunLoopDefaultMode, cf_timeout, true); i = pdb->event_count; pdb->poll_fds = NULL; } else #endif /* BACKEND_USES_CFRUNLOOP */ i = PDB_POLL(pdb->set, poll_timeout); IF_PD(fprintf(stderr, " => %d (timeout was: %d)\n", i, poll_timeout)); THREADS_DISALLOW(); check_threads_etc(); me->may_need_wakeup = 0; INVALIDATE_CURRENT_TIME(); } if (TYPEOF(me->after_callback) != T_INT) call_backend_monitor_cb (me, &me->after_callback); if (!i) { /* Timeout */ } else if (i>0) { int num_active = i; struct fd_callback_box fd_list = { me, NULL, &fd_list, -1, 0, 0, 0, 0, NULL }; struct fd_callback_box *box; ONERROR free_fd_list; SET_ONERROR(free_fd_list, do_free_fd_list, &fd_list); done_something = 1; #if 0 /* First clear revents for all the fds. * * FIXME: This is done for paranoia reasons. If all code that * messes with fds clears revents, this isn't needed. * * Note: This needs to be a separate loop, since kqueue sends * read and write in two separate events. */ while(i--) { int fd = PDB_GET_FD(poll_fds[i]); #ifdef BACKEND_USES_KQUEUE if(poll_fds[i].filter == MY_POLLSIGNAL) { continue; } #endif /* BACKEND_USES_KQUEUE */ box = SAFE_GET_ACTIVE_BOX (me, fd); if (box) { check_box (box, fd); box->revents = 0; box->rflags = 0; } } #endif /* Then flag the active events. */ i = num_active; while(i--) { int fd = PDB_GET_FD(poll_fds[i]); pdb_describe_event(me, poll_fds[i]); if (!(box = SAFE_GET_ACTIVE_BOX (me, fd))) { /* The box is no longer active. */ continue; } #ifdef MY_POLLNVAL if(PDB_CHECK_ERROR_EVENT(poll_fds[i], MY_POLLNVAL)) { struct pollfd fds; int ret; /* NOTE: /dev/poll returns POLLNVAL for closed descriptors. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLNVAL on %d\n", THR_NO, me->id, fd)); #ifdef PIKE_DEBUG #ifdef HAVE_POLL /* FIXME */ fds.fd=fd; fds.events=POLLIN; fds.revents=0; ret=poll(&fds, 1,1 ); if(fds.revents & POLLNVAL) Pike_fatal("Bad filedescriptor %d to poll().\n", fd); #endif /* Don't do anything further with this fd. */ continue; #endif /* PIKE_DEBUG */ } #endif /* MY_POLLNVAL */ check_box (box, fd); { #ifdef PIKE_DEBUG int handled = 0; #endif /* PIKE_DEBUG */ if (PDB_CHECK_ERROR_EVENT(poll_fds[i], MY_POLLERR)) { /* Errors are signalled on the first available callback. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLERR on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_ERROR; /* Note that Linux pipe's signal close in the write-direction * with POLLERR. * * FIXME: Signal on write-direction? */ #ifdef BACKEND_USES_KQUEUE /* kqueue signals errors as read or write events but * with an additional error flag, so we must take care * to not set any read/write bits if it's a sole error * event. */ if (!poll_fds[i].data) goto next_fd; #endif } if (PDB_CHECK_ERROR_EVENT(poll_fds[i], MY_POLLHUP)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLHUP on %d\n", THR_NO, me->id, fd)); /* Linux signals close in the read-direction of pipes * and fifos with POLLHUP. */ box->revents |= PIKE_BIT_FD_READ|PIKE_BIT_FD_READ_OOB; /* For historical reasons we also signal on the write-drection. */ box->revents |= PIKE_BIT_FD_WRITE|PIKE_BIT_FD_WRITE_OOB; DO_IF_DEBUG(handled = 1); } if (PDB_CHECK_EVENT(poll_fds[i], MY_POLLRDBAND)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLRDBAND on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_READ_OOB; DO_IF_DEBUG(handled = 1); } if (PDB_CHECK_EVENT(poll_fds[i], MY_POLLIN)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLRDNORM|POLLIN on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_READ; DO_IF_DEBUG(handled = 1); } if (PDB_CHECK_EVENT(poll_fds[i], MY_POLLWRBAND)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLWRBAND on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_WRITE_OOB; DO_IF_DEBUG(handled = 1); } if (PDB_CHECK_EVENT(poll_fds[i], MY_POLLOUT)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLOUT on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_WRITE; DO_IF_DEBUG(handled = 1); } if (PDB_CHECK_EVENT(poll_fds[i], MY_POLLFSEVENT)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLFSEVENT on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_FS_EVENT; DO_IF_DEBUG(handled = 1); } #ifdef PIKE_DEBUG if (!handled && PDB_GET_EVENTS(poll_fds[i])) { fprintf(stderr, "[%d]BACKEND[%d]: fd %ld has revents 0x%08lx, " "but hasn't been handled.\n", THR_NO, me->id, (long)PDB_GET_FD(poll_fds[i]), (long)PDB_GET_EVENTS(poll_fds[i])); pdb_describe_event(me, poll_fds[i]); } #endif /* PIKE_DEBUG */ } if (box->revents) { if (!(box->revents & (box->events | PIKE_BIT_FD_ERROR))) { /* Robustness paranoia; we've only received events that we * aren't interested in. Unregister the unwanted events * in case we are out of sync with the poll device. * Otherwise we risk entering a busy loop. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: Backend is out of sync for fd %d\n" "[%d]BACKEND[%d]: Wanted: 0x%04x Received: 0x%04x\n", THR_NO, me->id, fd, THR_NO, me->id, box->events, box->revents)); pdb_update_fd_set(me, pdb, fd, box->revents|box->events, box->events, box->flags); } next_fd: /* Hook in the box on the fd_list. */ if (!box->next) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: hooking in box for fd %d\n", THR_NO, me->id, fd)); box->next = fd_list.next; fd_list.next = box; if (box->ref_obj) add_ref(box->ref_obj); } else { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: fd %d already in list.\n", THR_NO, me->id, fd)); } } } /* Common code for all variants. * * Call callbacks for the active events. */ if (backend_call_active_callbacks(&fd_list, me)) { CALL_AND_UNSET_ONERROR(free_fd_list); goto backend_round_done; } CALL_AND_UNSET_ONERROR(free_fd_list); /* Must be up-to-date for backend_do_call_outs. */ INVALIDATE_CURRENT_TIME(); }else{ switch(errno) { #ifdef __NT__ default: Pike_fatal("Error in backend %d\n",errno); break; #endif case EINVAL: Pike_fatal("Invalid timeout to select().\n"); break; #ifdef WSAEINTR case WSAEINTR: #endif case EINTR: /* ignore */ break; #ifdef WSAEBADF case WSAEBADF: #endif #ifdef ENOTSOCK case ENOTSOCK: #endif #ifdef WSAENOTSOCK case WSAENOTSOCK: #endif case EBADF: /* TODO: Fix poll version! */ break; } } { int call_outs_called = backend_do_call_outs(me); /* Will update current_time after calls. */ if (call_outs_called) done_something = 1; if (call_outs_called < 0) goto backend_round_done; } call_callback(&me->backend_callbacks, NULL); backend_round_done: if (!done_something) timeout->tv_sec = -1; else { struct timeval now; INACCURATE_GETTIMEOFDAY(&now); timeout->tv_sec = now.tv_sec; timeout->tv_usec = now.tv_usec; my_subtract_timeval (timeout, &start_time); } me->exec_thread = 0; UNSET_ONERROR (uwp); } /*! @decl float|int(0..0) `()(void|float|int(0..0) sleep_time) *! Perform one pass through the backend. *! *! Calls any outstanding call-outs and non-blocking I/O *! callbacks that are registred in this backend object. *! *! @param sleep_time *! Wait at most @[sleep_time] seconds. The default when *! unspecified or the integer @expr{0@} is no time limit. *! *! @returns *! If the backend did call any callbacks or call outs then the *! time spent in the backend is returned as a float. Otherwise *! the integer @expr{0@} is returned. *! *! @seealso *! @[Pike.DefaultBackend], @[main()] */ PIKEFUN float|int(0..0) `()(void|float|int(0..0) sleep_time) { struct timeval timeout; /* Got bogus gcc warning on timeout.tv_usec. */ timeout.tv_sec = 0; timeout.tv_usec = 0; if (sleep_time && TYPEOF(*sleep_time) == PIKE_T_FLOAT) { timeout.tv_sec = (long) floor (sleep_time->u.float_number); timeout.tv_usec = (long) ((sleep_time->u.float_number - timeout.tv_sec) * 1e6); } else if (sleep_time && TYPEOF(*sleep_time) == T_INT && sleep_time->u.integer) { SIMPLE_BAD_ARG_ERROR("`()", 1, "float|int(0..0)"); } else timeout.tv_sec = -1; pdb_low_backend_once(THIS, &timeout); pop_n_elems (args); if (timeout.tv_sec < 0) push_int (0); else push_float (DO_NOT_WARN ((FLOAT_TYPE) (DO_NOT_WARN ((double) timeout.tv_sec) + DO_NOT_WARN ((double) timeout.tv_usec) / 1e6))); } #ifdef BACKEND_USES_CFRUNLOOP /*! @decl int enable_core_foundation(int(0..1) enable) *! On systems with CoreFoundation (OSX, iOS, etc), use CoreFoundation *! to poll for events. This enables system level technologies that rely *! on CoreFoundation Runloops to function properly. *! *! @param enable *! enable or disable this functionality *! *! @returns *! the previous value of this setting. *! */ PIKEFUN int enable_core_foundation(int enable) { int x = THIS->go_cf; if(enable && !THIS->go_cf) { THIS->go_cf = 1; init_cf(THIS, THIS->set); } else if(!enable && THIS->go_cf) { THIS->go_cf = 0; exit_cf(THIS); } pop_stack(); push_int(x); } /*! @decl int query_core_foundation_enabled() *! *! On systems with CoreFoundation (OSX, iOS, etc), indicate whether *! CoreFoundation is being used by this backend to poll for events. *! *! @returns *! the current state of CoreFoundation polling: 1=enabled, 0=disabled *! */ PIKEFUN int query_core_foundation_enabled() { int x = THIS->go_cf; push_int(x); return; } #endif /* BACKEND_USES_CFRUNLOOP */ EXTRA { pdb_offset = Pike_compiler->new_program->inherits[1].storage_offset - Pike_compiler->new_program->inherits[0].storage_offset; /* /dev/poll and kqueue fds get invalidated at fork. */ dmalloc_accept_leak(add_to_callback(&fork_child_callback, reopen_all_pdb_backends, NULL, NULL)); #ifdef BACKEND_USES_CFRUNLOOP add_integer_constant("HAVE_CORE_FOUNDATION", 1, 0); #endif /* BACKEND_USES_CFRUNLOOP */ #ifdef BACKEND_USES_KQUEUE add_integer_constant("HAVE_KQUEUE", 1, 0); #endif /* BACKEND_USES_KQUEUE */ } INIT { struct Backend_struct *me = THIS->backend = (struct Backend_struct *)(((char *)THIS) + pdb_offset); IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: Registering device backend...\n", THR_NO, me->id)); me->update_fd_set_handler = (update_fd_set_handler_fn *) pdb_update_fd_set; me->handler_data = THIS; IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: Registering backend...\n", THR_NO, me->id)); register_pdb_backend(THIS); IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: Opening poll device...\n", THR_NO, me->id)); if ((THIS->set = OPEN_POLL_DEVICE(THIS)) < 0) { Pike_error("Failed to open poll device (errno:%d)\n", errno); } set_close_on_exec(THIS->set, 1); } EXIT gc_trivial; { struct Backend_struct *me = THIS->backend; IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: Closing poll device...\n", THR_NO, me->id)); #ifdef BACKEND_USES_CFRUNLOOP exit_cf(THIS); #endif /* BACKEND_USES_CFRUNLOOP */ if (THIS->set >= 0) fd_close(THIS->set); unregister_pdb_backend(THIS); } } /*! @endclass */ #endif /* BACKEND_USES_POLL_DEVICE || BACKEND_USES_KQUEUE */ #ifdef HAVE_POLL /*! @class PollBackend *! @inherit __Backend *! *! @[Backend] implemented with @tt{poll(2)@} (SVr4, POSIX). *! *! @seealso *! @[Backend] */ PIKECLASS PollBackend { INHERIT Backend; /* Helpers to find the above inherit. */ static ptrdiff_t pb_offset = 0; CVAR struct Backend_struct *backend; /* * POLL/SELECT fd sets */ CVAR struct pb_selectors set; CVAR struct pb_selectors active_set; DECLARE_STORAGE /* * FD set handling */ static void pb_update_fd_set (struct Backend_struct *me, struct PollBackend_struct *pb, int fd, int old_events, int new_events, int flags) { int changed_events = old_events ^ new_events; IF_PD(fprintf (stderr, "[%d]BACKEND[%d]: pb_update_fd_set(.., %d, %d, %d):\n", THR_NO, me->id, fd, old_events, new_events)); if (changed_events) { if (changed_events & PIKE_BIT_FD_READ) { if (new_events & PIKE_BIT_FD_READ) { pb_MY_FD_SET(&pb->set, fd, MY_POLLIN); } else { pb_MY_FD_CLR(&pb->set, fd, MY_POLLIN); if (new_events & PIKE_BIT_FD_READ_OOB) { pb_MY_FD_SET(&pb->set, fd, MY_POLLRDBAND); } } } if (changed_events & PIKE_BIT_FD_READ_OOB) { if (new_events & PIKE_BIT_FD_READ_OOB) pb_MY_FD_SET(&pb->set, fd, MY_POLLRDBAND); else { if (!(new_events & PIKE_BIT_FD_READ)) { pb_MY_FD_CLR(&pb->set, fd, MY_POLLRDBAND); } else { pb_MY_FD_CLR_RDBAND(&pb->set, fd); } } } if (changed_events & PIKE_BIT_FD_WRITE) { if (new_events & PIKE_BIT_FD_WRITE) { pb_MY_FD_SET(&pb->set, fd, MY_POLLOUT); } else { if (!(new_events & PIKE_BIT_FD_WRITE_OOB)) { pb_MY_FD_CLR(&pb->set, fd, MY_POLLOUT); } } } if (changed_events & PIKE_BIT_FD_WRITE_OOB) { if (new_events & PIKE_BIT_FD_WRITE_OOB) pb_MY_FD_SET(&pb->set, fd, MY_POLLWRBAND); else { if (!(new_events & PIKE_BIT_FD_WRITE)) { pb_MY_FD_CLR(&pb->set, fd, MY_POLLWREXCEPT); } else { pb_MY_FD_CLR_WRBAND(&pb->set, fd); } } } if (new_events & ~old_events) /* New events were added. */ backend_wake_up_backend (me); } } #ifdef PIKE_DEBUG static void pb_backend_do_debug(struct Backend_struct *me, struct PollBackend_struct *pb) { int e; /* FIXME: OOB? */ for(e=0;e<pb->set.num_in_poll;e++) { PIKE_STAT_T tmp; int ret; int fd = pb->set.poll_fds[e].fd; if (fd >= fd_map_size || fd_map[fd] != me) Pike_fatal ("Isn't referenced from fd_map for fd %d at %d in poll set.\n", fd, e); do { ret=fd_fstat(fd, &tmp); /* FIXME: Perhaps do check_threads_etc() here? */ }while(ret < 0 && errno == EINTR); if(ret<0) { switch(errno) { case EBADF: Pike_fatal("Backend filedescriptor %d is bad.\n", fd); break; case ENOENT: Pike_fatal("Backend filedescriptor %d is not.\n", fd); break; } } } } #endif /* PIKE_DEBUG */ /* Mapping of events to flags and callbacks. * * Event select poll kqueue callback * * data_in read POLLIN EVFILT_READ READ * POLLRDNORM EVFILT_READ[EOF] * * data_out write POLLOUT EVFILT_WRITE WRITE * POLLWRNORM * * oob_in except POLLPRI (EVFILT_READ) READ_OOB * POLLRDBAND * * oob_out write POLLWRBAND (EVFILT_WRITE) WRITE_OOB * * close_in read POLLIN EVFILT_READ[EOF] READ * * close_out write POLLHUP EVFILT_WRITE[EOF] WRITE * >WRITE_OOB * * conn_ok write POLLOUT EVFILT_WRITE WRITE * * conn_fail read POLLIN EVFILT_READ[EOF] READ * except (READ_OOB) * * new_conn read POLLIN EVFILT_READ READ * * sock_err except POLLERR EVFILT_READ[ERR] ERROR * >READ * * sock_err except POLLERR EVFILT_WRITE[ERR] ERROR * >WRITE * fs_event NONE NONE EVFILT_VNODE FSEVENT */ /* A negative tv_sec in timeout turns it off. If it ran until the * timeout without calling any callbacks or call outs (except those * on backend_callbacks) then tv_sec will be set to -1. Otherwise it * will be set to the time spent. */ static void pb_low_backend_once(struct PollBackend_struct *pb, struct timeval *timeout) { ONERROR uwp; int i, done_something = 0; struct timeval start_time = *timeout; struct Backend_struct *me = pb->backend; #ifdef DECLARE_POLL_EXTRAS /* Declare any extra variables needed by MY_POLL(). */ DECLARE_POLL_EXTRAS; #endif /* DECLARE_POLL_EXTRAS */ SET_ONERROR(uwp, low_backend_cleanup, THIS->backend); low_backend_once_setup(pb->backend, &start_time); if (TYPEOF(me->before_callback) != T_INT) call_backend_monitor_cb (me, &me->before_callback); { int poll_timeout; struct timeval *next_timeout = &pb->backend->next_timeout; me->may_need_wakeup = 1; if (next_timeout->tv_sec >= 100000000) /* Take this as waiting forever. */ poll_timeout = -1; else if(next_timeout->tv_sec < 0) poll_timeout = 0; else if(next_timeout->tv_sec > (INT_MAX/1002)) poll_timeout = INT_MAX; else poll_timeout = (next_timeout->tv_sec*1000) + next_timeout->tv_usec/1000; pb_copy_selectors(& pb->active_set, &pb->set); IF_PD(fprintf (stderr, "[%d]BACKEND[%d]: Doing poll on fds:\n", THR_NO, me->id)); #ifdef POLL_DEBUG { int i; for (i = 0; i < pb->active_set.num_in_poll; i++) { fprintf (stderr, "[%d]BACKEND[%d]: fd %4d: %-4s %-5s %-8s %-9s: 0x%04x\n", THR_NO, me->id, pb->active_set.poll_fds[i].fd, pb->active_set.poll_fds[i].events & (POLLRDNORM|POLLIN) ? "read" : "", pb->active_set.poll_fds[i].events & POLLOUT ? "write" : "", pb->active_set.poll_fds[i].events & POLLRDBAND ? "read_oob" : "", pb->active_set.poll_fds[i].events & POLLWRBAND ? "write_oob" : "", pb->active_set.poll_fds[i].events); } } fprintf(stderr, "[%d]BACKEND[%d]: poll(%p, %d, %d)...", THR_NO, me->id, pb->active_set.poll_fds, pb->active_set.num_in_poll, poll_timeout); #endif /* POLL_DEBUG */ check_threads_etc(); THREADS_ALLOW(); /* Note: The arguments to MY_POLL may be evaluated multiple times. */ i = PB_POLL(pb->active_set, poll_timeout); IF_PD(fprintf(stderr, " => %d\n", i)); THREADS_DISALLOW(); check_threads_etc(); me->may_need_wakeup = 0; INVALIDATE_CURRENT_TIME(); } if (TYPEOF(me->after_callback) != T_INT) call_backend_monitor_cb (me, &me->after_callback); if (!i) { /* Timeout */ } else if (i>0) { int num_active = i; struct fd_callback_box fd_list = { NULL, NULL, NULL, -1, 0, 0, 0, 0, NULL, }; struct fd_callback_box *box; ONERROR free_fd_list; fd_list.backend = me; fd_list.next = &fd_list; SET_ONERROR(free_fd_list, do_free_fd_list, &fd_list); done_something = 1; /* First clear revents for all the fds. * * FIXME: This is done for paranoia reasons. If all code that * messes with fds clears revents, this isn't needed. * * Note: this needs to be a separate loop, since kqueue sends * read and write in two separate events. */ for(i=0; i<pb->active_set.num_in_poll; i++) { int fd = PB_GET_FD(pb->active_set.poll_fds[i]); box = SAFE_GET_ACTIVE_BOX (me, fd); if (box) { check_box (box, fd); box->revents = 0; box->flags = 0; } } /* Then flag the active events. */ for(i=0; i<pb->active_set.num_in_poll; i++) { int fd = PB_GET_FD(pb->active_set.poll_fds[i]); if (!(box = SAFE_GET_ACTIVE_BOX (me, fd))) { /* The box is no longer active. */ continue; } #ifdef MY_POLLNVAL if(PB_CHECK_ERROR_EVENT(pb->active_set.poll_fds[i], MY_POLLNVAL)) { struct pollfd fds; int ret; /* NOTE: /dev/poll returns POLLNVAL for closed descriptors. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLNVAL on %d\n", THR_NO, me->id, fd)); #ifdef PIKE_DEBUG /* FIXME */ fds.fd=fd; fds.events=POLLIN; fds.revents=0; ret=poll(&fds, 1,1 ); if(fds.revents & POLLNVAL) Pike_fatal("Bad filedescriptor %d to poll().\n", fd); /* Don't do anything further with this fd. */ continue; #endif /* PIKE_DEBUG */ } #endif /* MY_POLLNVAL */ check_box (box, fd); #if 0 if(PDB_CHECK_EVENT(poll_fds[i], MY_POLLSIGNAL)) { fprintf(stderr, "SIGNAL EVENT RECEIVED!\n"); } #endif { #ifdef PIKE_DEBUG int handled = 0; #endif /* PIKE_DEBUG */ if (PB_CHECK_ERROR_EVENT(pb->active_set.poll_fds[i], MY_POLLERR)) { /* Errors are signalled on the first available callback. */ IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLERR on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_ERROR; } if (PB_CHECK_EVENT(pb->active_set.poll_fds[i], MY_POLLRDBAND)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLRDBAND on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_READ_OOB; DO_IF_DEBUG(handled = 1); } if (PB_CHECK_EVENT(pb->active_set.poll_fds[i], MY_POLLIN)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLRDNORM|POLLIN on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_READ; DO_IF_DEBUG(handled = 1); } if (PB_CHECK_EVENT(pb->active_set.poll_fds[i], MY_POLLWRBAND) || PB_CHECK_ERROR_EVENT(pb->active_set.poll_fds[i], MY_POLLHUP)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLWRBAND|POLLHUP on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_WRITE_OOB; DO_IF_DEBUG(handled = 1); } if (PB_CHECK_EVENT(pb->active_set.poll_fds[i], MY_POLLOUT) || PB_CHECK_ERROR_EVENT(pb->active_set.poll_fds[i], MY_POLLHUP)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLOUT|POLLHUP on %d\n", THR_NO, me->id, fd)); box->revents |= PIKE_BIT_FD_WRITE; DO_IF_DEBUG(handled = 1); } if (PDB_CHECK_EVENT(poll_fds[i], MY_POLLFSEVENT)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: POLLFSEVENT on %d\n", THR_NO, me->id, fd)); box->rflags = PDB_GET_FLAGS(poll_fds[i]); box->revents |= PIKE_BIT_FD_FS_EVENT; DO_IF_DEBUG(handled = 1); } #ifdef PIKE_DEBUG if (!handled && PB_GET_EVENTS(pb->active_set.poll_fds[i])) { fprintf(stderr, "[%d]BACKEND[%d]: fd %ld has revents 0x%08lx, " "but hasn't been handled.\n", THR_NO, me->id, (long)PB_GET_FD(pb->active_set.poll_fds[i]), (long)PB_GET_EVENTS(pb->active_set.poll_fds[i])); /* pdb_describe_event(me, pb->active_set.poll_fds[i]); */ } #endif /* PIKE_DEBUG */ } if (box->revents) { next_fd: /* Hook in the box on the fd_list. */ if (!box->next) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: hooking in box for fd %d\n", THR_NO, me->id, fd)); box->next = fd_list.next; fd_list.next = box; if (box->ref_obj) add_ref(box->ref_obj); } else { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: fd %d already in list.\n", THR_NO, me->id, fd)); } } } /* Common code for all variants. * * Call callbacks for the active events. */ if (backend_call_active_callbacks(&fd_list, me)) { CALL_AND_UNSET_ONERROR(free_fd_list); goto backend_round_done; } CALL_AND_UNSET_ONERROR(free_fd_list); /* Must be up-to-date for backend_do_call_outs. */ INVALIDATE_CURRENT_TIME(); }else{ switch(errno) { #ifdef __NT__ default: Pike_fatal("Error in backend %d\n",errno); break; #endif case EINVAL: Pike_fatal("Invalid timeout to select().\n"); break; #ifdef WSAEINTR case WSAEINTR: #endif case EINTR: /* ignore */ break; #ifdef WSAEBADF case WSAEBADF: #endif #ifdef ENOTSOCK case ENOTSOCK: #endif #ifdef WSAENOTSOCK case WSAENOTSOCK: #endif case EBADF: /* TODO: Fix poll version! */ break; } } { int call_outs_called = backend_do_call_outs(me); /* Will update current_time after calls. */ if (call_outs_called) done_something = 1; if (call_outs_called < 0) goto backend_round_done; } call_callback(&me->backend_callbacks, NULL); backend_round_done: if (!done_something) timeout->tv_sec = -1; else { struct timeval now; INACCURATE_GETTIMEOFDAY(&now); timeout->tv_sec = now.tv_sec; timeout->tv_usec = now.tv_usec; my_subtract_timeval (timeout, &start_time); } me->exec_thread = 0; UNSET_ONERROR (uwp); } /*! @decl float|int(0..0) `()(void|float|int(0..0) sleep_time) *! Perform one pass through the backend. *! *! Calls any outstanding call-outs and non-blocking I/O *! callbacks that are registred in this backend object. *! *! @param sleep_time *! Wait at most @[sleep_time] seconds. The default when *! unspecified or the integer @expr{0@} is no time limit. *! *! @returns *! If the backend did call any callbacks or call outs then the *! time spent in the backend is returned as a float. Otherwise *! the integer @expr{0@} is returned. *! *! @seealso *! @[Pike.DefaultBackend], @[main()] */ PIKEFUN float|int(0..0) `()(void|float|int(0..0) sleep_time) { struct timeval timeout; /* Got correct gcc warning on timeout.tv_usec. */ if (sleep_time && TYPEOF(*sleep_time) == PIKE_T_FLOAT) { timeout.tv_sec = (long) floor (sleep_time->u.float_number); timeout.tv_usec = (long) ((sleep_time->u.float_number - timeout.tv_sec) * 1e6); } else if (sleep_time && TYPEOF(*sleep_time) == T_INT && sleep_time->u.integer) { SIMPLE_BAD_ARG_ERROR("`()", 1, "float|int(0..0)"); } else { timeout.tv_sec = -1; timeout.tv_usec = 0; } pb_low_backend_once(THIS, &timeout); pop_n_elems (args); if (timeout.tv_sec < 0) push_int (0); else push_float (DO_NOT_WARN ((FLOAT_TYPE) (DO_NOT_WARN ((double) timeout.tv_sec) + DO_NOT_WARN ((double) timeout.tv_usec) / 1e6))); } EXTRA { pb_offset = Pike_compiler->new_program->inherits[1].storage_offset - Pike_compiler->new_program->inherits[0].storage_offset; IF_PD(fprintf(stderr, "MY_POLLIN: 0x%04x\n" "MY_POLLOUT: 0x%04x\n" "MY_POLLEXCEPT: 0x%04x\n" "MY_POLLRDBAND: 0x%04x\n" "MY_POLLWREXCEPT: 0x%04x\n" "MY_POLLWRBAND: 0x%04x\n", MY_POLLIN, MY_POLLOUT, MY_POLLEXCEPT, MY_POLLRDBAND, MY_POLLWREXCEPT, MY_POLLWRBAND)); } INIT { struct Backend_struct *me = THIS->backend = (struct Backend_struct *)(((char *)THIS) + pb_offset); IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: init generic\n", THR_NO, me->id)); #ifdef PIKE_DEBUG me->debug_handler = (debug_handler_fn *) pb_backend_do_debug; #endif me->update_fd_set_handler = (update_fd_set_handler_fn *) pb_update_fd_set; me->handler_data = THIS; THIS->set.poll_fds=0; THIS->set.poll_fd_size=0; THIS->set.num_in_poll=0; THIS->active_set.poll_fds=0; THIS->active_set.poll_fd_size=0; THIS->active_set.num_in_poll=0; } EXIT gc_trivial; { struct Backend_struct *me = THIS->backend; int e; IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: exit generic backend\n", THR_NO, me->id)); if (THIS->set.poll_fds) { free(THIS->set.poll_fds); THIS->set.poll_fds = NULL; THIS->set.poll_fd_size = 0; THIS->set.num_in_poll = 0; } if (THIS->active_set.poll_fds) { free(THIS->active_set.poll_fds); THIS->active_set.poll_fds = NULL; THIS->active_set.poll_fd_size = 0; THIS->active_set.num_in_poll = 0; } } } /*! @endclass */ #endif /* HAVE_POLL */ /*! @class SelectBackend *! @inherit __Backend *! *! Backend based on the classic @tt{select(2)@} system call from BSD. */ PIKECLASS SelectBackend { INHERIT Backend; /* Helpers to find the above inherit. */ static ptrdiff_t sb_offset = 0; CVAR struct Backend_struct *backend; /* * POLL/SELECT fd sets */ CVAR struct sb_selectors set; CVAR struct sb_active_selectors active_set; DECLARE_STORAGE /* * FD set handling */ static void sb_update_fd_set (struct Backend_struct *me, struct SelectBackend_struct *sb, int fd, int old_events, int new_events) { int changed_events = old_events ^ new_events; IF_PD(fprintf (stderr, "[%d]BACKEND[%d]: sb_update_fd_set(.., %d, %d, %d):\n", THR_NO, me->id, fd, old_events, new_events)); if (changed_events) { if (changed_events & PIKE_BIT_FD_READ) { if (new_events & PIKE_BIT_FD_READ) { sb_MY_FD_SET(&sb->set, fd, MY_READSET); /* Got to enable the exception set to get errors (at least * according to POSIX). */ sb_MY_FD_SET(&sb->set, fd, MY_EXCEPTSET); } else { sb_MY_FD_CLR(&sb->set, fd, MY_READSET); if (!(new_events & PIKE_BIT_FD_READ_OOB) && !(new_events & PIKE_BIT_FD_WRITE)) /* Exceptions might cause calls to read, read_oob and write. */ sb_MY_FD_CLR(&sb->set, fd, MY_EXCEPTSET); } } if (changed_events & PIKE_BIT_FD_READ_OOB) { if (new_events & PIKE_BIT_FD_READ_OOB) sb_MY_FD_SET(&sb->set, fd, MY_EXCEPTSET); else { if (!(new_events & PIKE_BIT_FD_READ)) { if (!(new_events & PIKE_BIT_FD_WRITE)) /* Exceptions might cause calls to read, read_oob and write. */ sb_MY_FD_CLR(&sb->set, fd, MY_EXCEPTSET); } } } if (changed_events & PIKE_BIT_FD_WRITE) { if (new_events & PIKE_BIT_FD_WRITE) { sb_MY_FD_SET(&sb->set, fd, MY_WRITESET); /* Got to enable the exception set to get errors (at least * according to POSIX). */ sb_MY_FD_SET(&sb->set, fd, MY_EXCEPTSET); } else { if (!(new_events & PIKE_BIT_FD_WRITE_OOB)) { sb_MY_FD_CLR(&sb->set, fd, MY_WRITESET); if (!(new_events & PIKE_BIT_FD_READ) && !(new_events & PIKE_BIT_FD_READ_OOB)) /* Exceptions might cause calls to read, read_oob and write. */ sb_MY_FD_CLR(&sb->set, fd, MY_EXCEPTSET); } } } if (changed_events & PIKE_BIT_FD_WRITE_OOB) { if (new_events & PIKE_BIT_FD_WRITE_OOB) sb_MY_FD_SET(&sb->set, fd, MY_WRITESET); else { if (!(new_events & PIKE_BIT_FD_WRITE)) { sb_MY_FD_CLR(&sb->set, fd, MY_WRITESET); } } } if (new_events & ~old_events) /* New events were added. */ backend_wake_up_backend (me); } } #ifdef PIKE_DEBUG static void sb_backend_do_debug(struct Backend_struct *me, struct SelectBackend_struct *sb) { int e; PIKE_STAT_T tmp; /* FIXME: OOB? */ for(e=0;e<=sb->set.max_fd;e++) { if(my_FD_ISSET(e, sb->set.sets + MY_READSET) || my_FD_ISSET(e, sb->set.sets + MY_WRITESET) || my_FD_ISSET(e, sb->set.sets + MY_EXCEPTSET) ) { int ret; if (e >= fd_map_size || fd_map[e] != me) Pike_fatal ("Isn't referenced from fd_map for fd %d in select set.\n", e); do { ret = fd_fstat(e, &tmp); /* FIXME: Perhaps do check_threads_etc() here? */ }while(ret < 0 && errno == EINTR); if(ret<0) { switch(errno) { case EBADF: Pike_fatal("Backend filedescriptor %d is bad.\n",e); break; case ENOENT: Pike_fatal("Backend filedescriptor %d is not.\n",e); break; } } } } } #endif /* PIKE_DEBUG */ /* A negative tv_sec in timeout turns it off. If it ran until the * timeout without calling any callbacks or call outs (except those * on backend_callbacks) then tv_sec will be set to -1. Otherwise it * will be set to the time spent. */ static void sb_low_backend_once(struct SelectBackend_struct *sb, struct timeval *timeout) { ONERROR uwp; int i, done_something = 0; struct timeval start_time = *timeout; struct Backend_struct *me = sb->backend; #ifdef DECLARE_POLL_EXTRAS /* Declare any extra variables needed by MY_POLL(). */ DECLARE_POLL_EXTRAS; #endif /* DECLARE_POLL_EXTRAS */ SET_ONERROR(uwp, low_backend_cleanup, THIS->backend); low_backend_once_setup(sb->backend, &start_time); if (TYPEOF(me->before_callback) != T_INT) call_backend_monitor_cb (me, &me->before_callback); { struct timeval poll_timeout; struct timeval *next_timeout = &sb->backend->next_timeout; me->may_need_wakeup = 1; poll_timeout = *next_timeout; sb_copy_selectors(& sb->active_set, &sb->set); IF_PD(fprintf (stderr, "[%d]BACKEND[%d]: Doing poll on fds:\n", THR_NO, me->id)); check_threads_etc(); THREADS_ALLOW(); /* Note: The arguments to MY_POLL may be evaluated multiple times. */ i = SB_SELECT(sb->active_set, poll_timeout); IF_PD(fprintf(stderr, " => %d\n", i)); THREADS_DISALLOW(); check_threads_etc(); me->may_need_wakeup = 0; INVALIDATE_CURRENT_TIME(); } if (TYPEOF(me->after_callback) != T_INT) call_backend_monitor_cb (me, &me->after_callback); if (!i) { /* Timeout */ } else if (i>0) { int num_active = i; struct fd_callback_box fd_list = { me, NULL, &fd_list, -1, 0, 0, 0, 0, NULL }; struct fd_callback_box *box; ONERROR free_fd_list; SET_ONERROR(free_fd_list, do_free_fd_list, &fd_list); done_something = 1; for(i=0; i <= sb->active_set.max_fd; i++) { box = SAFE_GET_ACTIVE_BOX(me, i); if (!box) continue; check_box(box, i); box->revents = 0; box->flags = 0; if(fd_FD_ISSET(i, sb->active_set.asets + MY_EXCEPTSET)) { /* Check for errors. GNU libc says this isn't set on error, but * POSIX does. FIXME: What bits will be set for errors on GNU * systems, then? Should we always check for that? */ int err = 0; ACCEPT_SIZE_T len = sizeof (err); IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: exception on %d\n", THR_NO, me->id, i)); if (!getsockopt (i, SOL_SOCKET, SO_ERROR, (void *)&err, &len) && err) { IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: error on %d, error=%d\n", THR_NO, me->id, i, err)); box->revents |= PIKE_BIT_FD_ERROR; } else { box->revents |= PIKE_BIT_FD_READ_OOB; } } if(fd_FD_ISSET(i, sb->active_set.asets + MY_READSET)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: read on %d\n", THR_NO, me->id, i)); box->revents |= PIKE_BIT_FD_READ; } if(fd_FD_ISSET(i, sb->active_set.asets + MY_WRITESET)) { IF_PD(fprintf(stderr, "[%d]BACKEND[%d]: write on %d\n", THR_NO, me->id, i)); /* OOB can by BSD definition always be written, so if we can * write normal data it's reasonable to assume OOB can be * written too without too much risk of being thrown away. */ box->revents |= PIKE_BIT_FD_WRITE | PIKE_BIT_FD_WRITE_OOB; } if (box->revents) { /* Hook in the box on the fd_list. */ if (!box->next) { box->next = fd_list.next; fd_list.next = box; if (box->ref_obj) add_ref(box->ref_obj); } } } /* Common code for all variants. * * Call callbacks for the active events. */ if (backend_call_active_callbacks(&fd_list, me)) { CALL_AND_UNSET_ONERROR(free_fd_list); goto backend_round_done; } CALL_AND_UNSET_ONERROR(free_fd_list); /* Must be up-to-date for backend_do_call_outs. */ INVALIDATE_CURRENT_TIME(); }else{ switch(errno) { #ifdef __NT__ default: Pike_fatal("Error in backend %d\n",errno); break; #endif case EINVAL: Pike_fatal("Invalid timeout to select().\n"); break; #ifdef WSAEINTR case WSAEINTR: #endif case EINTR: /* ignore */ break; #ifdef WSAEBADF case WSAEBADF: #endif #ifdef ENOTSOCK case ENOTSOCK: #endif #ifdef WSAENOTSOCK case WSAENOTSOCK: #endif case EBADF: /* TODO: Fix poll version! */ sb_copy_selectors(&sb->active_set, &sb->set); timeout->tv_usec=0; timeout->tv_sec=0; if(SB_SELECT(sb->active_set, *timeout) < 0) { switch(errno) { #ifdef WSAEBADF case WSAEBADF: #endif #ifdef ENOTSOCK case ENOTSOCK: #endif #ifdef WSAENOTSOCK case WSAENOTSOCK: #endif case EBADF: { FOR_EACH_ACTIVE_FD_BOX (me, box) { fd_FD_ZERO(sb->active_set.asets + MY_READSET); fd_FD_ZERO(sb->active_set.asets + MY_WRITESET); fd_FD_ZERO(sb->active_set.asets + MY_EXCEPTSET); if(my_FD_ISSET(box->fd, sb->set.sets + MY_READSET)) fd_FD_SET(box->fd, sb->active_set.asets + MY_READSET); if(my_FD_ISSET(box->fd, sb->set.sets + MY_WRITESET)) fd_FD_SET(box->fd, sb->active_set.asets + MY_WRITESET); if(my_FD_ISSET(box->fd, sb->set.sets + MY_EXCEPTSET)) fd_FD_SET(box->fd, sb->active_set.asets + MY_EXCEPTSET); timeout->tv_usec=0; timeout->tv_sec=0; if(SB_SELECT(sb->active_set, *timeout) < 0) { switch(errno) { #ifdef __NT__ default: #endif case EBADF: #ifdef WSAEBADF case WSAEBADF: #endif #ifdef ENOTSOCK case ENOTSOCK: #endif #ifdef WSAENOTSOCK case WSAENOTSOCK: #endif #ifdef DEBUG_MALLOC debug_malloc_dump_fd(box->fd); #endif Pike_fatal("Filedescriptor %d (%s) caused fatal error %d in backend.\n",box->fd,fd_info(box->fd),errno); case EINTR: break; } } } } } #ifdef _REENTRANT /* FIXME: Extra stderr messages should not be allowed.../Hubbe */ write_to_stderr("Bad filedescriptor to select().\n" "fd closed in another thread?\n", 62); #else /* !_REENTRANT */ Pike_fatal("Bad filedescriptor to select().\n"); #endif /* _REENTRANT */ } break; } } { int call_outs_called = backend_do_call_outs(me); /* Will update current_time after calls. */ if (call_outs_called) done_something = 1; if (call_outs_called < 0) goto backend_round_done; } call_callback(&me->backend_callbacks, NULL); backend_round_done: if (!done_something) timeout->tv_sec = -1; else { struct timeval now; INACCURATE_GETTIMEOFDAY(&now); timeout->tv_sec = now.tv_sec; timeout->tv_usec = now.tv_usec; my_subtract_timeval (timeout, &start_time); } me->exec_thread = 0; UNSET_ONERROR (uwp); } /*! @decl float|int(0..0) `()(void|float|int(0..0) sleep_time) *! Perform one pass through the backend. *! *! Calls any outstanding call-outs and non-blocking I/O *! callbacks that are registred in this backend object. *! *! @param sleep_time *! Wait at most @[sleep_time] seconds. The default when *! unspecified or the integer @expr{0@} is no time limit. *! *! @returns *! If the backend did call any callbacks or call outs then the *! time spent in the backend is returned as a float. Otherwise *! the integer @expr{0@} is returned. *! *! @seealso *! @[Pike.DefaultBackend], @[main()] */ PIKEFUN float|int(0..0) `()(void|float|int(0..0) sleep_time) { struct timeval timeout; /* Got bogus gcc warning on timeout.tv_usec. */ if (sleep_time && TYPEOF(*sleep_time) == PIKE_T_FLOAT) { timeout.tv_sec = (long) floor (sleep_time->u.float_number); timeout.tv_usec = (long) ((sleep_time->u.float_number - timeout.tv_sec) * 1e6); } else if (sleep_time && TYPEOF(*sleep_time) == T_INT && sleep_time->u.integer) { SIMPLE_BAD_ARG_ERROR("`()", 1, "float|int(0..0)"); } else timeout.tv_sec = -1; sb_low_backend_once(THIS, &timeout); pop_n_elems (args); if (timeout.tv_sec < 0) push_int (0); else push_float (DO_NOT_WARN ((FLOAT_TYPE) (DO_NOT_WARN ((double) timeout.tv_sec) + DO_NOT_WARN ((double) timeout.tv_usec) / 1e6))); } EXTRA { sb_offset = Pike_compiler->new_program->inherits[1].storage_offset - Pike_compiler->new_program->inherits[0].storage_offset; } INIT { struct Backend_struct *me = THIS->backend = (struct Backend_struct *)(((char *)THIS) + sb_offset); IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: init generic\n", THR_NO, me->id)); #ifdef PIKE_DEBUG me->debug_handler = (debug_handler_fn *) sb_backend_do_debug; #endif me->update_fd_set_handler = (update_fd_set_handler_fn *) sb_update_fd_set; me->handler_data = THIS; THIS->set.max_fd=0; my_FD_ZERO(THIS->set.sets + MY_READSET); my_FD_ZERO(THIS->set.sets + MY_WRITESET); my_FD_ZERO(THIS->set.sets + MY_EXCEPTSET); /* FIXME: Should there be something else here? */ /* me->set.num_fds=0; */ } EXIT gc_trivial; { struct Backend_struct *me = THIS->backend; IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: exit generic backend\n", THR_NO, me->id)); } } /*! @endclass */ /*! @module DefaultBackend *! This is the @[Backend] object that files and call_outs are *! handled by by default. *! *! This is also the @[Backend] object that will be used if @[main()] *! returns @expr{-1@}. *! *! @seealso *! @[Backend], @[Stdio.File()->set_nonblocking()], @[call_out()] */ /*! @endmodule */ /*! @endmodule */ /*! @decl mixed call_out(function f, float|int delay, mixed ... args) *! @decl void _do_call_outs() *! @decl int find_call_out(function f) *! @decl int find_call_out(mixed id) *! @decl int remove_call_out(function f) *! @decl int remove_call_out(function id) *! @decl array(array) call_out_info() *! These are aliases for the corresponding functions in *! @[Pike.DefaultBackend]. *! *! @seealso *! @[Pike.Backend()->call_out()], @[Pike.Backend()->_do_call_outs()], *! @[Pike.Backend()->find_call_out()], @[Pike.Backend()->remove_call_out()], *! @[Pike.Backend()->call_out_info()] */ /* This doesn't need to be here */ PMOD_EXPORT int write_to_stderr(char *a, size_t len) { #ifdef __NT__ size_t e; for(e=0;e<len;e++) putc(a[e],stderr); #else int nonblock=0; size_t pos; int tmp; if(!len) return 1; for(pos=0;pos<len;pos+=tmp) { tmp=write(2,a+pos,len-pos); if(tmp<0) { tmp=0; switch(errno) { #ifdef EWOULDBLOCK case EWOULDBLOCK: nonblock=1; set_nonblocking(2,0); continue; #endif case EINTR: check_threads_etc(); continue; } break; } } if(nonblock) set_nonblocking(2,1); #endif return 1; } PMOD_EXPORT struct object *get_backend_obj_for_fd (int fd) { struct Backend_struct *b = really_get_backend_for_fd (fd); if (!b) return NULL; return b->backend_obj; } PMOD_EXPORT void set_backend_for_fd (int fd, struct Backend_struct *new) { struct Backend_struct *old = get_backend_for_fd (fd); IF_PD (fprintf (stderr, "Changing backend from %d to %d for fd %d\n", old ? old->id : -1, new ? new->id : -1, fd)); if (!old) low_set_backend_for_fd (fd, new); else if (old != new) { struct fd_callback_box *box = SAFE_GET_ACTIVE_BOX (old, fd); if (box) { if (new) change_backend_for_box (box, new); else { int is_compat_box = box->callback == compat_box_dispatcher; unhook_fd_callback_box (box); if (is_compat_box) really_free_compat_cb_box ((struct compat_cb_box *) box); } } low_set_backend_for_fd (fd, new); } } /* Compat stuff for old backend interface. */ struct compat_cb_box { struct fd_callback_box box; /* Must be first. */ file_callback read, write, read_oob, write_oob, fs_event; void *read_data, *write_data, *read_oob_data, *write_oob_data, *fs_event_data; int flags; /* fs event flags */ }; #undef DMALLOC_DESCRIBE_BLOCK #define DMALLOC_DESCRIBE_BLOCK(X) do { \ fprintf (stderr, " backend: %p, fd: %d, events: 0x%x\n", \ X->box.backend, X->box.fd, X->box.events); \ } while (0) static struct block_allocator compat_cb_allocator = BA_INIT_PAGES(sizeof(struct compat_cb_box), 1); static struct compat_cb_box * alloc_compat_cb_box() { return ba_alloc(&compat_cb_allocator); } static void really_free_compat_cb_box(struct compat_cb_box * b) { ba_free(&compat_cb_allocator, b); } void count_memory_in_compat_cb_boxs(size_t * n, size_t * s) { ba_count_all(&compat_cb_allocator, n, s); } void free_all_compat_cb_box_blocks() { ba_destroy(&compat_cb_allocator); } static int compat_box_dispatcher (struct fd_callback_box *box, int event) { struct compat_cb_box *cbox = (struct compat_cb_box *) box; switch (event) { case PIKE_FD_READ: IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: compat_box_dispatcher for " "PIKE_FD_READ to %p %p\n", THR_NO, cbox->box.backend->id, cbox->read, cbox->read_data)); return cbox->read (cbox->box.fd, cbox->read_data); case PIKE_FD_WRITE: IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: compat_box_dispatcher for " "PIKE_FD_WRITE to %p %p\n", THR_NO, cbox->box.backend->id, cbox->write, cbox->write_data)); return cbox->write (cbox->box.fd, cbox->write_data); case PIKE_FD_READ_OOB: IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: compat_box_dispatcher for " "PIKE_FD_READ_OOB to %p %p\n", THR_NO, cbox->box.backend->id, cbox->read_oob, cbox->read_oob_data)); return cbox->read_oob (cbox->box.fd, cbox->read_oob_data); case PIKE_FD_WRITE_OOB: IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: compat_box_dispatcher for " "PIKE_FD_WRITE_OOB to %p %p\n", THR_NO, cbox->box.backend->id, cbox->write_oob, cbox->write_oob_data)); return cbox->write_oob (cbox->box.fd, cbox->write_oob_data); case PIKE_FD_FS_EVENT: IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: compat_box_dispatcher for " "PIKE_FD_FS_EVENT to %p %p\n", THR_NO, cbox->box.backend->id, cbox->fs_event, cbox->fs_event_data)); return cbox->fs_event (cbox->box.fd, cbox->fs_event_data); default: #ifdef PIKE_DEBUG Pike_fatal ("Unexpected event type %d.\n", event); #endif return 0; /* To keep gcc happy. */ } } #define WRAP(CB, EVENT_BIT) \ void PIKE_CONCAT3(set_, CB, _callback) (int fd, file_callback cb, void *data) \ { \ struct Backend_struct *b = really_get_backend_for_fd (fd); \ struct fd_callback_box *box = SAFE_GET_ACTIVE_BOX (b, fd); \ struct compat_cb_box *cbox; \ \ IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: set_" #CB "_callback (%d, %p, %p)\n", \ THR_NO, b->id, fd, cb, data)); \ \ if (box) { \ check_box (box, fd); \ DO_IF_DEBUG ( \ if (box->callback != compat_box_dispatcher) \ Pike_fatal ("Mixing old and new style " \ "backend interfaces for fd %d.\n", fd); \ ); \ cbox = (struct compat_cb_box *) box; \ } \ else { \ if (!cb) return; \ cbox = alloc_compat_cb_box(); \ INIT_FD_CALLBACK_BOX (&cbox->box, b, NULL, \ fd, 0, compat_box_dispatcher, 0); \ } \ \ cbox->CB = cb; \ cbox->PIKE_CONCAT (CB, _data) = data; \ \ if (cb) \ set_fd_callback_events (&cbox->box, cbox->box.events | EVENT_BIT, cbox->flags); \ else { \ set_fd_callback_events (&cbox->box, cbox->box.events & ~EVENT_BIT, cbox->flags); \ if (!cbox->box.events) { \ unhook_fd_callback_box (&cbox->box); \ really_free_compat_cb_box (cbox); \ } \ } \ } \ \ file_callback PIKE_CONCAT3(query_, CB, _callback) (int fd) \ { \ struct Backend_struct *b=get_backend_for_fd (fd); \ struct fd_callback_box *box; \ struct compat_cb_box *cbox; \ \ if (!b) return NULL; \ if (!(box = SAFE_GET_ACTIVE_BOX (b, fd))) return NULL; \ check_box (box, fd); \ DO_IF_DEBUG ( \ if (box->callback != compat_box_dispatcher) \ Pike_fatal ("Mixing old and new style " \ "backend interfaces for fd %d.\n", fd); \ ); \ \ cbox = (struct compat_cb_box *) box; \ if (!(cbox->box.events & EVENT_BIT)) return NULL; \ return cbox->CB; \ } \ \ void *PIKE_CONCAT3(query_, CB, _callback_data) (int fd) \ { \ struct Backend_struct *b=get_backend_for_fd (fd); \ struct fd_callback_box *box; \ struct compat_cb_box *cbox; \ \ if (!b) return NULL; \ if (!(box = SAFE_GET_ACTIVE_BOX (b, fd))) return NULL; \ check_box (box, fd); \ DO_IF_DEBUG ( \ if (box->callback != compat_box_dispatcher) \ Pike_fatal ("Mixing old and new style " \ "backend interfaces for fd %d.\n", fd); \ ); \ \ cbox = (struct compat_cb_box *) box; \ if (!(cbox->box.events & EVENT_BIT)) return NULL; \ return cbox->PIKE_CONCAT (CB, _data); \ } #define WRAP2(CB, EVENT_BIT) \ void PIKE_CONCAT3(set_, CB, _callback) (int fd, file_callback cb, void *data, int flags) \ { \ struct Backend_struct *b = really_get_backend_for_fd (fd); \ struct fd_callback_box *box = SAFE_GET_ACTIVE_BOX (b, fd); \ struct compat_cb_box *cbox; \ \ IF_PD (fprintf (stderr, "[%d]BACKEND[%d]: set_" #CB "_callback (%d, %p, %p)\n", \ THR_NO, b->id, fd, cb, data)); \ \ if (box) { \ check_box (box, fd); \ DO_IF_DEBUG ( \ if (box->callback != compat_box_dispatcher) \ Pike_fatal ("Mixing old and new style " \ "backend interfaces for fd %d.\n", fd); \ ); \ cbox = (struct compat_cb_box *) box; \ } \ else { \ if (!cb) return; \ cbox = alloc_compat_cb_box(); \ INIT_FD_CALLBACK_BOX (&cbox->box, b, NULL, \ fd, 0, compat_box_dispatcher, flags); \ } \ \ cbox->CB = cb; \ cbox->PIKE_CONCAT (CB, _data) = data; \ \ if (cb) \ set_fd_callback_events (&cbox->box, cbox->box.events | EVENT_BIT, cbox->flags); \ else { \ set_fd_callback_events (&cbox->box, cbox->box.events & ~EVENT_BIT, cbox->flags); \ if (!cbox->box.events) { \ unhook_fd_callback_box (&cbox->box); \ really_free_compat_cb_box (cbox); \ } \ } \ } \ \ file_callback PIKE_CONCAT3(query_, CB, _callback) (int fd) \ { \ struct Backend_struct *b=get_backend_for_fd (fd); \ struct fd_callback_box *box; \ struct compat_cb_box *cbox; \ \ if (!b) return NULL; \ if (!(box = SAFE_GET_ACTIVE_BOX (b, fd))) return NULL; \ check_box (box, fd); \ DO_IF_DEBUG ( \ if (box->callback != compat_box_dispatcher) \ Pike_fatal ("Mixing old and new style " \ "backend interfaces for fd %d.\n", fd); \ ); \ \ cbox = (struct compat_cb_box *) box; \ if (!(cbox->box.events & EVENT_BIT)) return NULL; \ return cbox->CB; \ } \ \ void *PIKE_CONCAT3(query_, CB, _callback_data) (int fd) \ { \ struct Backend_struct *b=get_backend_for_fd (fd); \ struct fd_callback_box *box; \ struct compat_cb_box *cbox; \ \ if (!b) return NULL; \ if (!(box = SAFE_GET_ACTIVE_BOX (b, fd))) return NULL; \ check_box (box, fd); \ DO_IF_DEBUG ( \ if (box->callback != compat_box_dispatcher) \ Pike_fatal ("Mixing old and new style " \ "backend interfaces for fd %d.\n", fd); \ ); \ \ cbox = (struct compat_cb_box *) box; \ if (!(cbox->box.events & EVENT_BIT)) return NULL; \ return cbox->PIKE_CONCAT (CB, _data); \ } WRAP(read, PIKE_BIT_FD_READ) WRAP(write, PIKE_BIT_FD_WRITE) WRAP(read_oob, PIKE_BIT_FD_READ_OOB) WRAP(write_oob, PIKE_BIT_FD_WRITE_OOB) WRAP2(fs_event, PIKE_BIT_FD_FS_EVENT) PMOD_EXPORT struct callback *debug_add_backend_callback(callback_func call, void *arg, callback_func free_func) { return backend_debug_add_backend_callback(default_backend, call, arg, free_func); } void wake_up_backend(void) { if(default_backend) backend_wake_up_backend(default_backend); } void do_call_outs(void) { if(default_backend) { INVALIDATE_CURRENT_TIME(); backend_do_call_outs(default_backend); } } #ifdef PIKE_DEBUG long do_debug_cycle=1; long current_do_debug_cycle=0; void do_debug(void) { extern void check_all_arrays(void); extern void check_all_mappings(void); extern void check_all_programs(void); extern void check_all_objects(void); extern void verify_shared_strings_tables(void); extern void slow_check_stack(void); if(current_do_debug_cycle) return; current_do_debug_cycle=++do_debug_cycle; if (d_flag > 2) { verify_shared_strings_tables(); slow_check_stack(); check_all_arrays(); check_all_mappings(); check_all_programs(); check_all_objects(); } call_callback(& do_debug_callbacks, 0); if(default_backend) backend_do_debug(default_backend); if(d_flag>3) do_gc(NULL, 1); current_do_debug_cycle=0; } PMOD_EXPORT void debug_check_fd_not_in_use (int fd) { if (fd < 0) Pike_fatal ("Invalid fd: %d\n", fd); if (fd < fd_map_size && fd_map[fd]) Pike_fatal ("fd %d already in use by backend %d.\n", fd, fd_map[fd]->id); } #endif /* PIKE_DEBUG */ static struct callback *mem_callback; void init_backend(void) { IF_PD(fprintf(stderr, "BACKEND: Init compat callback boxes...\n")); IF_PD(fprintf(stderr, "BACKEND: INIT...\n")); INIT; IF_PD(fprintf(stderr, "BACKEND: Creating default backend...\n")); { /* Select something suitable. */ #ifdef OPEN_POLL_DEVICE /* Note that creation of a poll device backend may fail. */ JMP_BUF recovery; if (SETJMP(recovery)) { #ifdef HAVE_POLL default_backend_obj = clone_object(PollBackend_program, 0); #else default_backend_obj = clone_object(SelectBackend_program, 0); #endif } else { default_backend_obj = clone_object(PollDeviceBackend_program, 0); } UNSETJMP(recovery); #elif defined(HAVE_POLL) default_backend_obj = clone_object(PollBackend_program, 0); #else default_backend_obj = clone_object(SelectBackend_program, 0); #endif default_backend = (struct Backend_struct *) get_storage(default_backend_obj, Backend_program); mem_callback=add_memory_usage_callback(count_memory_in_call_outs,0,0); add_object_constant("__backend", default_backend_obj, 0); add_program_constant("DefaultBackendClass", default_backend_obj->prog, 0); } } #ifdef DO_PIKE_CLEANUP void exit_backend(void) { /* Note: The mem_callback has already been freed * by exit_builtin_efuns() at this point. */ /* if (mem_callback) remove_callback(mem_callback); */ free_object(default_backend_obj); default_backend = 0; EXIT; } /* Note: This is called when the last backend object exits, which might be * after exit_backend if there's garbage. */ static void backend_cleanup() { #ifdef OPEN_POLL_DEVICE if (pdb_backends) { free(pdb_backends); num_pdb_backends = 0; } #endif /* OPEN_POLL_DEVICE */ free_all_compat_cb_box_blocks(); if(fd_map) { free(fd_map); fd_map=0; fd_map_size=0; } #ifdef HAVE_BROKEN_F_SETFD cleanup_close_on_exec(); #endif /* HAVE_BROKEN_F_SETFD */ } #endif

pike.git/ src/ backend.cmod > 14df02056f872dcdbd8b61f69900c84c79a800a4 [Annotate]