b1fca01996-11-12Per Hedbor #define error(X) throw( ({ (X), backtrace()[0..sizeof(backtrace())-2] }) ) inherit "/precompiled/file"; varargs int exec(string file,string ... foo) { string path; if(search(file,"/")) return exece(combine_path(getcwd(),file),foo,getenv()); path=getenv("PATH"); foreach(path/":",path) if(file_stat(path=combine_path(path,file))) return exece(path, foo,getenv()); return 69; } varargs int spawn(string s,object stdin,object stdout,object stderr) { object p; int pid; string t; pid=fork(); if(pid==-1) error("No more processes.\n"); if(pid) { return pid; }else{ if(stdin) stdin->dup2(File("stdin")); if(stdout) stdout->dup2(File("stdout")); if(stderr) stderr->dup2(File,"stderr"); exec("/bin/sh","-c",s); exit(69); } } string popen(string s) { object p; string t; p=file::pipe(); if(!p) error("Popen failed. (couldn't create pipe)\n"); spawn(s,0,p,0); destruct(p); t=read(0x7fffffff); if(!t) { int e; e=errno(); close(); error("Popen failed with error "+e+".\n"); }else{ close(); } return t; } void system(string s) { object p; int pid; string t; p=file::pipe(); if(!p) error("System() failed.\n"); p->set_close_on_exec(0); if(pid=fork()) { destruct(p); /* Nothing will ever be written here, we are just waiting for it * to close */ file::read(1); }else{ exec("/bin/sh","-c",s); exit(69); } } void create() { add_constant("system",system); add_constant("exec",exec); add_constant("spawn",spawn); add_constant("popen",popen); }