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/* -*- 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. 
*/ 
 
/* Module for the linux inotify api. 
 * 
 * Ref: inotify(7) 
 * 
 */ 
 
#ifdef HAVE_CONFIG_H 
# include "config.h" 
#endif 
 
#include "global.h" 
#include "interpret.h" 
#include "module.h" 
#include "program.h" 
#include "stralloc.h" 
#include "svalue.h" 
#include "object.h" 
#include "pike_types.h" 
#include "builtin_functions.h" 
#include "fdlib.h" 
#include "fd_control.h" 
#include "pike_threadlib.h" 
 
#ifdef HAVE_SYS_INOTIFY_H 
 
#include <sys/inotify.h> 
#include <errno.h> 
 
/* Autoconf helpfully litters generated files with colliding defines. */ 
#undef PACKAGE_BUGREPORT 
#undef PACKAGE_NAME 
#undef PACKAGE_STRING 
#undef PACKAGE_TARNAME 
#undef PACKAGE_URL 
#undef PACKAGE_VERSION 
 
#include "modules/_Stdio/file_machine.h" 
#include "modules/_Stdio/file.h" 
 
DECLARATIONS 
 
/*! @module System */ 
 
/*! @module Inotify 
 *! This module implements an API to linux inotify. It is available on all 
 *! kernels from version 2.6.13 onwards. Inotify offers fast and scalable file 
 *! notifications. 
 */ 
 
/*! @decl constant IN_ALL_EVENTS 
 *! This is a derived constant that is not part of the standard inotify API. It 
 *! is the union of all other constants. 
 *! 
 *! @decl constant IN_ACCESS 
 *! @decl constant IN_ATTRIB 
 *! @decl constant IN_CLOSE 
 *! @decl constant IN_CLOSE_WRITE 
 *! @decl constant IN_CLOSE_NOWRITE 
 *! @decl constant IN_CREATE 
 *! @decl constant IN_DELETE 
 *! @decl constant IN_DELETE_SELF 
 *! @decl constant IN_MODIFY 
 *! @decl constant IN_MOVE_SELF 
 *! @decl constant IN_MOVED_FROM 
 *! @decl constant IN_MOVED_TO 
 *! @decl constant IN_OPEN 
 *! @decl constant IN_MOVE 
 *! @decl constant IN_CLOSE 
 *! @decl constant IN_DONT_FOLLOW 
 *! @decl constant IN_MASK_ADD 
 *! @decl constant IN_ONESHOT 
 *! @decl constant IN_ONLYDIR 
 *! @decl constant IN_IGNORED 
 *! @decl constant IN_ISDIR 
 *! @decl constant IN_Q_OVERFLOW 
 *! @decl constant IN_UNMOUNT 
 *!     Please have a look at the inotify(7) manpage for information about 
 *!     these constants. 
 *! @note 
 *!     Some constants may not be available when the module has been 
 *!     compiled on a machine with linux kernel before 2.6.15. See the 
 *!     manpage for more details. 
 */ 
 
/*! @decl array(string|int) parse_event(string data) 
 *! Parses one inotify_event struct from @expr{data@}. 
 *! @returns 
 *!     Returns an array consisting of 
 *!     @array 
 *!         @elem int 0 
 *!             The watch descriptor returned by @[_Instance()->add_watch()] 
 *!             when the watch for this file was added. 
 *!         @elem int 1 
 *!             An integer that describes the event that occured. See 
 *!             the inotify manpage for a list of possible events and 
 *!             their numerical identifiers. 
 *!         @elem int 2 
 *!             An integer cookie that can be used to group together 
 *!             different events that were triggered by moving a file 
 *!             from one location to another. 
 *!         @elem string 3 
 *!             The name of the file. This will only be present if the 
 *!             event happened to a file in a directory that was 
 *!             watched, e.g. with @[System.Inotify.IN_CREATE]. 
 *!             Otherwise this will be 0. 
 *!         @elem int 4 
 *!             The length of the data that has been parsed. If the @[data] 
 *!             string contains more than one inotify event, this parse 
 *!             function needs to be called again with the remainder as 
 *!             an argument. 
 *!     @endarray 
 */ 
PIKEFUN array(string|int) parse_event(string data) { 
    struct inotify_event event; 
    size_t len; 
    const char * d; 
 
    if (data->size_shift) 
        Pike_error("Inotify events should not be wide.\n"); 
 
    if ((size_t)data->len < sizeof(struct inotify_event)) 
        Pike_error("Malformed data.\n"); 
 
    d = data->str; 
 
    memcpy(&event, d, sizeof(struct inotify_event)); 
 
    push_int(event.wd); 
    push_int((int)event.mask); 
    push_int((int)event.cookie); 
 
    if (event.len) { 
        if (event.len > data->len - sizeof(struct inotify_event)) 
            Pike_error("Data missing. Got %u expected %u bytes.\n", (unsigned)(data->len - sizeof(struct inotify_event)), event.len); 
        d += sizeof(struct inotify_event); 
        push_string(make_shared_binary_string(d, strnlen(d, event.len))); 
    } else { 
        push_int(0); 
    } 
 
    push_int((int)(event.len + sizeof(struct inotify_event))); 
 
    f_aggregate(5); 
    stack_swap(); 
    pop_stack(); 
} 
 
/*! @class _Instance 
 *!     Simple wrapper class that gives direct access to the @tt{inotify(7)@} 
 *!     interface. On create an inotify instance is initiated by calling 
 *!     @tt{inotify_init(2)@}. Every object of this class has its own inotify 
 *!     file descriptor. Use this class only if you want direct access to 
 *!     the file descriptor to read from it manually. For a more user 
 *!     friendly inferface use @[System.Inotify.Instance]. 
 *! 
 *! @seealso 
 *!     @[System.Inotify.Instance] 
 */ 
PIKECLASS _Instance { 
    CVAR struct fd_callback_box box; 
    CVAR struct string_builder buf; 
 
    /*! @decl private function(int, int, int, string:void) event_callback 
     *! 
     *! Callback function that is called when an event is triggered. 
     *! 
     *! @seealso 
     *!   @[set_event_callback()], @[query_event_callback()] 
     */ 
    PIKEVAR function(int, int, int, string:void) event_callback 
      flags ID_PRIVATE; 
    static int event_callback_fun_num; 
 
    EXTRA 
    { 
      /* NB: Inlined isidentifier() due to it not being exported. */ 
      event_callback_fun_num = 
        really_low_find_shared_string_identifier(MK_STRING("event_callback"), 
                                                 Pike_compiler->new_program, 
                                                 SEE_PROTECTED|SEE_PRIVATE); 
      if (event_callback_fun_num == -1) { 
        Pike_fatal("Inotify: Event callback variable not mapped!\n"); 
      } 
      /* We don't want to count references to ourselves. */ 
      ID_FROM_INT(Pike_compiler->new_program, event_callback_fun_num)-> 
        identifier_flags |= IDENTIFIER_NO_THIS_REF; 
    } 
 
    static void check_schedule_poll(void) 
    { 
      if (THIS->box.events & PIKE_BIT_FD_READ) { 
        /* Nonblocking mode. */ 
        if (THIS->buf.s->len >= (ptrdiff_t)sizeof(struct inotify_event)) { 
          /* There's stuff waiting in the buffer, so schedule 
           * an immediate call_out of poll() to handle the data. 
           */ 
          ref_push_function(Pike_fp->current_object, 
                            f_Inotify_cq__Instance_poll_fun_num + 
                            Pike_fp->context->identifier_level); 
          push_int(0); 
          safe_apply(get_backend_obj(THIS->box.backend), "call_out", 2); 
          pop_stack(); 
        } 
      } 
    } 
 
    /*! @decl int add_watch(string file, int mask) 
     *! Add a watch for a certain file or directory and specific events. 
     *! Adding more than one watch for one file will overwrite the 
     *! previous watch unless @[System.Inotify.IN_MASK_ADD] is contained 
     *! in the mask. 
     *! @param path 
     *!     Path of the file or directory. 
     *! @param mask 
     *!     Integer mask specifying the event type. This can be a 
     *!     combination of different event types using bitwise OR. 
     *!     See the inotify manpage for possible values and their 
     *!     description. The values defined by the inotify header 
     *!     file are exported by @[System.Inotify] as constants 
     *!     using the same names (e.g. @[System.Inotify.IN_CREATE]). 
     *! @returns 
     *!     Returns a watch descriptor. 
     *! @note 
     *!     Subdirectories are not watched. If you want to watch 
     *!     subdirectories as well, you need to add watches for 
     *!     them individually. 
     *! @note 
     *!     At creation of a watch for a directory simulated 
     *!     @[IN_CREATE]-events with cookie @expr{0x7fffffff@} will 
     *!     be added for the initial contents of the directory. 
     *!     This is to reduce the risk of losing state changes 
     *!     due to races. Note that is is not known whether these 
     *!     paths are in flux or not. Note also that there may 
     *!     be multiple notifications for content that is created 
     *!     at the moment the watch is created. 
     *! 
     *! @seealso 
     *!     @[rm_watch()], @[parse_event()] 
     */ 
    PIKEFUN int add_watch(string file, int mask) { 
        INT32 wd; 
 
        if (file->size_shift) 
            Pike_error("Widestring filenames are not allowed.\n"); 
 
        wd = inotify_add_watch(THIS->box.fd, file->str, mask); 
 
        if (wd == -1) 
            Pike_error("inotify_add_watch failed: %s\n", 
                       strerror(errno)); 
 
        if (mask & IN_CREATE) { 
          DIR *dir = opendir(file->str); 
          if (dir) { 
            struct dirent *dirent; 
            /* Add any paths already present to the input buffer. */ 
            while ((dirent = readdir(dir))) { 
              struct inotify_event ev; 
              int pad = 0; 
 
              if ((dirent->d_name[0] == '.') && 
                  (!dirent->d_name[1] || 
                   ((dirent->d_name[1] == '.') && !dirent->d_name[2]))) { 
                /* Filter "." and ".." */ 
                continue; 
              } 
              ev.wd = wd; 
              ev.mask = IN_CREATE;      /* FIXME: Use custom code? */ 
              ev.cookie = (uint32_t)0x7fffffff; /* Special marker. */ 
              ev.len = strlen(dirent->d_name) + 1; 
              if (ev.len & 0x07) { 
                pad = 0x08 - (ev.len & 0x07); 
                ev.len += pad; 
              } 
 
              if (dirent->d_type == DT_DIR) { 
                ev.mask |= IN_ISDIR; 
              } 
              /* FIXME: Handle DT_UNKNOWN. */ 
 
              string_build_mkspace(&THIS->buf, sizeof(ev) + ev.len, 0); 
              string_builder_binary_strcat0(&THIS->buf, 
                                            (p_wchar0 *)&ev, 
                                            sizeof(ev)); 
              string_builder_strcat(&THIS->buf, dirent->d_name); 
              string_builder_fill(&THIS->buf, pad+1, 
                                  MKPCHARP("\0\0\0\0\0\0\0\0", 0), 8, 0); 
            } 
            closedir(dir); 
 
            /* Wake up the backend if we've added stuff to the buffer. */ 
            check_schedule_poll(); 
          } 
        } 
        RETURN wd; 
    } 
 
 
    /*! @decl int query_fd() 
     *! @returns 
     *!     Returns the file descriptor associated with this inotify instance. 
     */ 
    PIKEFUN int query_fd() { 
        push_int(THIS->box.fd); 
    } 
 
    /*! @decl int rm_watch(int wd) 
     *! Remove a watch. 
     *! @param wd 
     *!     The watch descriptor that was returned by @[add_watch()]. 
     */ 
    PIKEFUN void rm_watch(int wd) { 
        INT32 err; 
 
        err = inotify_rm_watch(THIS->box.fd, wd); 
 
        if (!err || (errno == EINVAL)) { 
            /* NB: EINVAL typically means that the watch descriptor is 
             *     invalid, and is often triggered by the descriptor 
             *     having been automatically removed. 
             */ 
            return; 
        } 
 
        if (errno == EBADF) { 
            Pike_error("Oups. I feel funny inside.\n"); 
        } 
        Pike_error("Unexpected error: %d.\n", errno); 
    } 
 
    /*! @decl void set_event_callback(function(int, int, int, string:void) cb) 
     *! 
     *! Set the @[event_callback]. 
     *! 
     *! @seealso 
     *!   @[get_event_callback()], @[event_callback], @[poll()] 
     */ 
    PIKEFUN void set_event_callback(function(int, int, int, string:void) cb) 
    { 
      /* Use object indexing to handle circular reference counting correctly. */ 
      object_low_set_index(Pike_fp->current_object, 
                           Pike_fp->context->identifier_level + 
                           event_callback_fun_num, 
                           cb); 
    } 
 
    /*! @decl function(int, int, int, string:void) get_event_callback() 
     *! 
     *! Get the current @[event_callback]. 
     *! 
     *! @seealso 
     *!   @[set_event_callback()], @[event_callback], @[poll()] 
     */ 
    PIKEFUN function(int, int, int, string:void) get_event_callback() 
    { 
      push_svalue(&THIS->event_callback); 
    } 
 
    /*! @decl void set_backend(Pike.Backend backend) 
     *! 
     *! Set the backend used for callbacks. 
     *! 
     *! @seealso 
     *!   @[set_event_callback()], @[set_nonblocking()], @[poll()] 
     */ 
    PIKEFUN void set_backend(object backend_object) 
    { 
        struct Backend_struct *backend = 
            get_storage(backend_object, Backend_program); 
        if (!backend) 
            SIMPLE_ARG_TYPE_ERROR("set_backend", 1, "Pike.Backend"); 
        change_backend_for_box(&THIS->box, backend); 
    } 
 
    /*! @decl void set_nonblocking() 
     *! 
     *! Enable backend callback mode. 
     *! 
     *! The configured backend will call @[poll()] automatically 
     *! as soon as there are events pending. 
     *! 
     *! @seealso 
     *!   @[set_blocking()], @[poll()] 
     */ 
    PIKEFUN void set_nonblocking() 
    { 
      set_fd_callback_events(&THIS->box, PIKE_BIT_FD_READ, 0); 
    } 
 
    /*! @decl void set_blocking() 
     *! 
     *! Disable backend callback mode. 
     *! 
     *! The configured backend will stop calling @[poll()], so 
     *! @[poll()] will need to be called by hand. 
     *! 
     *! @seealso 
     *!   @[set_blocking()], @[poll()] 
     */ 
    PIKEFUN void set_blocking() 
    { 
      set_fd_callback_events(&THIS->box, 0, 0); 
    } 
 
    /*! @decl void poll() 
     *! 
     *! Check for any pending events. 
     *! 
     *! Any pending events will be read and parsed, and @[event_callback] will 
     *! be called once for each event. The arguments to the @[event_callback] 
     *! will be: 
     *! @array 
     *!   @elem int 1 
     *!     The watch descriptor that was triggered. 
     *!   @elem int 2 
     *!     The event that was triggerend (one of @tt{IN_*@}). 
     *!   @elem int 3 
     *!     An integer cookie used to identify grouped events. 
     *!   @elem string 4 
     *!     The name of the path segment (if any). 
     *! @endarray 
     *! 
     *! @note 
     *!   This function is called by the backend when there are events 
     *!   pending. 
     *! 
     *! @seealso 
     *!   @[set_event_callback()] 
     */ 
    PIKEFUN void poll() 
    { 
        ptrdiff_t off = 0; 
        ptrdiff_t bytes; 
        do { 
            string_build_mkspace(&THIS->buf, 1024, 0); 
            do { 
                bytes = read(THIS->box.fd, 
                             THIS->buf.s->str + THIS->buf.s->len, 
                             1024); 
            } while ((bytes == -1) && (errno == EINTR)); 
            if (bytes > 0) { 
              THIS->buf.s->len += bytes; 
            } 
            while (THIS->buf.s->len >= 
                   (off + (ptrdiff_t)sizeof(struct inotify_event))) { 
                /* NB: Assumes that e->len has a valid alignment 
                 *     for the struct. This could cause problems 
                 *     on non-x86 systems and injected data. 
                 */ 
                struct inotify_event *e = (void *)(THIS->buf.s->str + off); 
                const char *path = (char *)(e + 1); 
                ptrdiff_t new_off = off + sizeof(struct inotify_event) + e->len; 
                if (new_off > THIS->buf.s->len) { 
                    /* Not enough data for the filename yet. */ 
                    break; 
                } 
                off = new_off; 
 
                push_int(e->wd); 
                push_int(e->mask); 
                push_int(e->cookie); 
                push_string(make_shared_binary_string(path, 
                                                      strnlen(path, e->len))); 
                safe_apply_svalue(&THIS->event_callback, 4, 1); 
                pop_stack(); 
            } 
            if (off == THIS->buf.s->len) { 
                /* End of data reached. Restart at beginning of buffer. */ 
                off = THIS->buf.s->len = 0; 
            } 
        } while (bytes > 0); 
        if (off) { 
            /* Unlikely, but... */ 
            THIS->buf.s->len -= off; 
            memmove(THIS->buf.s->str, THIS->buf.s->str + off, 
                    THIS->buf.s->len); 
        } 
    } 
 
    static int got_inotify_event(struct fd_callback_box *box, int UNUSED(event)) 
    { 
        apply(box->ref_obj, "poll", 0); 
        pop_stack(); 
        return 0; 
    } 
 
    INIT { 
        THIS->box.fd = -1; 
        init_string_builder_alloc(&THIS->buf, 1024, 0); 
        INIT_FD_CALLBACK_BOX(&THIS->box, default_backend, 
                             Pike_fp->current_object, 
                             inotify_init(), 0, got_inotify_event, 0); 
 
        if (THIS->box.fd == -1) { 
          switch (errno) { 
          case EMFILE: 
            Pike_error("User limit on inotify instances reached.\n"); 
            break; 
          case ENFILE: 
            Pike_error("User limit on file descriptors reached.\n"); 
            break; 
          case ENOMEM: 
            Pike_error("No free kernel memory available.\n"); 
            break; 
          default: 
            Pike_error("Failed to initialize.\n"); 
            break; 
          } 
        } 
        set_nonblocking(THIS->box.fd, 1); 
    } 
 
    EXIT { 
        if (THIS->box.fd != -1) { 
            int fd = THIS->box.fd; 
            set_fd_callback_events(&THIS->box, 0, 0); 
            change_fd_for_box(&THIS->box, -1); 
            unhook_fd_callback_box(&THIS->box); 
            /* 
             * Currently (linux 3.4.9) closing an inotify fd takes 
             * on the order of 100 ms 
             */ 
            THREADS_ALLOW(); 
            while ((close(fd) == -1) && (errno == EINTR)) 
              ; 
            THREADS_DISALLOW(); 
        } 
        free_string_builder(&THIS->buf); 
    } 
} 
 
/*! @endclass 
 */ 
 
#define ADD_ICONST(name) do {                   \ 
    add_integer_constant(#name, name, 0);       \ 
} while(0); 
 
#else /* !HAVE_SYS_INOTIFY_H */ 
 
#define ADD_ICONST(name) 
 
#endif /* HAVE_SYS_INOTIFY_H */ 
 
PIKE_MODULE_INIT { 
    ADD_ICONST(IN_ACCESS); 
    ADD_ICONST(IN_ALL_EVENTS); 
    ADD_ICONST(IN_ATTRIB); 
    ADD_ICONST(IN_CLOSE_WRITE); 
    ADD_ICONST(IN_CLOSE_NOWRITE); 
    ADD_ICONST(IN_CREATE); 
    ADD_ICONST(IN_DELETE); 
    ADD_ICONST(IN_DELETE_SELF); 
    ADD_ICONST(IN_MODIFY); 
    ADD_ICONST(IN_MOVE_SELF); 
    ADD_ICONST(IN_MOVED_FROM); 
    ADD_ICONST(IN_MOVED_TO); 
    ADD_ICONST(IN_OPEN); 
 
    ADD_ICONST(IN_MOVE); 
    ADD_ICONST(IN_CLOSE); 
 
/* some of these came with 2.6.15 linux and 2.5 glibc */ 
#ifdef IN_DONT_FOLLOW 
    ADD_ICONST(IN_DONT_FOLLOW); 
#endif 
#ifdef IN_MASK_ADD 
    ADD_ICONST(IN_MASK_ADD); 
#endif 
    ADD_ICONST(IN_ONESHOT); 
#ifdef IN_ONLYDIR 
    ADD_ICONST(IN_ONLYDIR); 
#endif 
 
    ADD_ICONST(IN_IGNORED); 
    ADD_ICONST(IN_ISDIR); 
    ADD_ICONST(IN_Q_OVERFLOW); 
    ADD_ICONST(IN_UNMOUNT); 
 
    INIT 
} 
 
PIKE_MODULE_EXIT { 
    EXIT 
} 
 
/*! @endmodule 
 */ 
/*! @endmodule 
 */