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/*
* Copyright (C) 1996-8 Michael R. Elkins <me@cs.hmc.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "mutt.h"
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
int _mutt_system (const char *cmd, int flags)
{
int rc = -1;
struct sigaction act;
struct sigaction oldtstp;
struct sigaction oldcont;
sigset_t set;
pid_t thepid;
if (!cmd || !*cmd)
return (0);
/* must ignore SIGINT and SIGQUIT */
mutt_block_signals_system ();
/* also don't want to be stopped right now */
if (flags & M_DETACH_PROCESS)
{
sigemptyset (&set);
sigaddset (&set, SIGTSTP);
sigprocmask (SIG_BLOCK, &set, NULL);
}
else
{
act.sa_handler = SIG_DFL;
/* we want to restart the waitpid() below */
#ifdef SA_RESTART
act.sa_flags = SA_RESTART;
#endif
sigemptyset (&act.sa_mask);
sigaction (SIGTSTP, &act, &oldtstp);
sigaction (SIGCONT, &act, &oldcont);
}
if ((thepid = fork ()) == 0)
{
act.sa_flags = 0;
if (flags & M_DETACH_PROCESS)
{
int fd;
/* give up controlling terminal */
setsid ();
switch (fork ())
{
case 0:
#if defined(OPEN_MAX)
for (fd = 0; fd < OPEN_MAX; fd++)
close (fd);
#elif defined(_POSIX_OPEN_MAX)
for (fd = 0; fd < _POSIX_OPEN_MAX; fd++)
close (fd);
#else
close (0);
close (1);
close (2);
#endif
chdir ("/");
act.sa_handler = SIG_DFL;
sigaction (SIGCHLD, &act, NULL);
break;
case -1:
_exit (127);
default:
_exit (0);
}
}
/* reset signals for the child; not really needed, but... */
mutt_unblock_signals_system (0);
act.sa_handler = SIG_DFL;
act.sa_flags = 0;
sigemptyset (&act.sa_mask);
sigaction (SIGTERM, &act, NULL);
sigaction (SIGTSTP, &act, NULL);
sigaction (SIGCONT, &act, NULL);
execl (EXECSHELL, "sh", "-c", cmd, NULL);
_exit (127); /* execl error */
}
else if (thepid != -1)
{
/* wait for the (first) child process to finish */
waitpid (thepid, &rc, 0);
}
sigaction (SIGCONT, &oldcont, NULL);
sigaction (SIGTSTP, &oldtstp, NULL);
/* reset SIGINT, SIGQUIT and SIGCHLD */
mutt_unblock_signals_system (1);
if (flags & M_DETACH_PROCESS)
sigprocmask (SIG_UNBLOCK, &set, NULL);
rc = (thepid != -1) ? (WIFEXITED (rc) ? WEXITSTATUS (rc) : -1) : -1;
return (rc);
}
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