/* Various utilities - Unix variants
   Copyright (C) 1998 the Free Software Foundation.

   Written 1998 by:
   Miguel de Icaza

   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <signal.h>		/* my_system */
#include <limits.h>		/* INT_MAX */
#include <sys/time.h>		/* select: timeout */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdarg.h>
#ifdef HAVE_SYS_WAIT_H
#    include <sys/wait.h>	/* my_system */
#endif
#include <errno.h>		/* my_system */
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_SYS_SELECT_H
#  include <sys/select.h>
#endif
#include <gnome.h>
#include <X11/Xlib.h>
#include <gdk/gdkprivate.h>
#include "global.h"

int my_system (int flags, const char *shell, const char *command)
{
	pid_t pid;
	struct sigaction ignore, save_intr, save_quit, save_stop;
	int status = 0, i;
	
	ignore.sa_handler = SIG_IGN;
	sigemptyset (&ignore.sa_mask);
	ignore.sa_flags = 0;
    
	sigaction (SIGINT, &ignore, &save_intr);    
	sigaction (SIGQUIT, &ignore, &save_quit);

	if ((pid = fork ()) < 0){
		return -1;
	}
	if (pid == 0){
		const int top = max_open_files ();
		struct sigaction default_pipe;

		sigaction (SIGINT,  &save_intr, NULL);
		sigaction (SIGQUIT, &save_quit, NULL);

		/*
		 * reset sigpipe
		 */
		default_pipe.sa_handler = SIG_DFL;
		sigemptyset (&default_pipe.sa_mask);
		default_pipe.sa_flags = 0;
		
		sigaction (SIGPIPE, &default_pipe, NULL);
		
		for (i = 0; i < top; i++)
			close (i);

		/* Setup the file descriptor for the child */
		   
		/* stdin */
		open ("/dev/null", O_RDONLY);

		/* stdout */
		open ("/dev/null", O_WRONLY);

		/* stderr */
		open ("/dev/null", O_WRONLY);
		
		if (!(flags & EXECUTE_WAIT))
			pid = fork ();
		
		if (pid == 0){
			if (flags & EXECUTE_AS_SHELL)
				execl (shell, shell, "-c", command, (char *) 0);
			else
				execlp (shell, shell, command, (char *) 0);
			/* See note below for why we use _exit () */
			_exit (127);		/* Exec error */
		} else {
			int status;

			if (flags & EXECUTE_WAIT)
				waitpid (pid, &status, 0);
		}
		/* We need to use _exit instead of exit to avoid
		 * calling the atexit handlers (specifically the gdk atexit
		 * handler
		 */
		_exit (0);
	}
	waitpid (pid, &status, 0);
	sigaction (SIGINT,  &save_intr, NULL);
	sigaction (SIGQUIT, &save_quit, NULL);
	sigaction (SIGTSTP, &save_stop, NULL);

	return WEXITSTATUS(status);
}