/* monitor.c - monitors the wmaker process
 *
 *  Window Maker window manager
 *
 *  Copyright (c) 1997-2004 Alfredo K. Kojima
 *
 *  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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "wconfig.h"
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <sys/wait.h>
#ifdef __FreeBSD__
#include <sys/signal.h>
#endif


#include "WindowMaker.h"
#include "screen.h"
#include "window.h"
#include "dialog.h"
#include "main.h"



int MonitorLoop(int argc, char **argv)
{
	pid_t pid, exited;
	char **child_argv = wmalloc(sizeof(char *) * (argc + 2));
	int i, status;
	time_t last_start;
	Bool error = False;

	for (i = 0; i < argc; i++)
		child_argv[i] = argv[i];
	child_argv[i++] = "--for-real";
	child_argv[i] = NULL;

	for (;;) {
		last_start = time(NULL);

		/* Start Window Maker */
		pid = fork();
		if (pid == 0) {
			execvp(child_argv[0], child_argv);
			werror(_("Error respawning Window Maker"));
			exit(1);
		} else if (pid < 0) {
			werror(_("Error respawning Window Maker"));
			exit(1);
		}

		do {
			exited = waitpid(-1, &status, 0);
			if (exited < 0) {
				werror(_("Error during monitoring of Window Maker process."));
				error = True;
				break;
			}
		} while (exited != pid);

		if (error)
			break;

		child_argv[argc] = "--for-real-";

		/* Check if the wmaker process exited due to a crash */
		if (WIFSIGNALED(status) &&
		    (WTERMSIG(status) == SIGSEGV ||
		     WTERMSIG(status) == SIGBUS ||
		     WTERMSIG(status) == SIGILL || WTERMSIG(status) == SIGABRT || WTERMSIG(status) == SIGFPE)) {
			wwarning(_("Window Maker exited due to a crash (signal %i) — exiting"),
				 WTERMSIG(status));
		} 
		break;
	}
	wfree(child_argv);
	return 0;
}