exec/exec_fork_background.c

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00001 // Copyright 2006 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or modify
00004 // it under the terms of the GNU General Public License as published by
00005 // the Free Software Foundation; either version 2 of the License, or
00006 // (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the
00015 // Free Software Foundation, Inc.,
00016 // 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00017 
00018 #include <unistd.h>
00019 #include <stdlib.h>
00020 #include <stdarg.h>
00021 #include <errno.h>
00022 #include <signal.h>
00023 
00024 #include "argv.h"
00025 #include "exec.h"
00026 #include "printf.h"
00027 
00028 int exec_fork_background(const char *fmt, ...)
00029 {
00030         va_list ap;
00031         va_start(ap, fmt);
00032         
00033         char *cmd;
00034         _lucid_vasprintf(&cmd, fmt, ap);
00035         
00036         va_end(ap);
00037         
00038         int argc;
00039         char *argv[EXEC_MAX_ARGV];
00040         
00041         argc = argv_from_str(cmd, argv, EXEC_MAX_ARGV);
00042         
00043         if (argc < 1) {
00044                 free(cmd);
00045                 return errno = EINVAL, -1;
00046         }
00047         
00048         pid_t pid;
00049         int i;
00050         
00051         switch ((pid = fork())) {
00052         case -1:
00053                 return -1;
00054         
00055         case 0:
00056                 usleep(200);
00057                 
00058                 for (i = 0; i < 100; i++)
00059                         close(i);
00060                 
00061                 execvp(argv[0], argv);
00062         
00063         default:
00064                 signal(SIGCHLD, SIG_IGN);
00065         }
00066         
00067         free(cmd);
00068         return 0;
00069 }

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