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/*
* Soft: Keepalived is a failover program for the LVS project
* <www.linuxvirtualserver.org>. It monitor & manipulate
* a loadbalanced server pool using multi-layer checks.
*
* Part: Forked system call to launch an extra script.
*
* Author: Alexandre Cassen, <acassen@linux-vs.org>
*
* 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.
*
* 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.
*
* Copyright (C) 2001-2011 Alexandre Cassen, <acassen@linux-vs.org>
*/
#include <unistd.h>
#include <stdlib.h>
#include <syslog.h>
#include <fcntl.h>
#include "notify.h"
#include "signals.h"
#include "logger.h"
/* perform a system call */
int
system_call(char *cmdline)
{
int retval;
retval = system(cmdline);
if (retval == 127) {
/* couldn't exec command */
log_message(LOG_ALERT, "Couldn't exec command: %s", cmdline);
} else if (retval == -1) {
/* other error */
log_message(LOG_ALERT, "Error exec-ing command: %s", cmdline);
}
return retval;
}
/* Close all FDs >= a specified value */
void
closeall(int fd)
{
int fdlimit = sysconf(_SC_OPEN_MAX);
while (fd < fdlimit)
close(fd++);
}
/* Execute external script/program */
int
notify_exec(char *cmd)
{
pid_t pid;
int ret;
pid = fork();
/* In case of fork is error. */
if (pid < 0) {
log_message(LOG_INFO, "Failed fork process");
return -1;
}
/* In case of this is parent process */
if (pid)
return 0;
signal_handler_destroy();
closeall(0);
open("/dev/null", O_RDWR);
ret = dup(0);
ret = dup(0);
system_call(cmd);
exit(0);
}
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