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/* direvent - directory content watcher daemon
Copyright (C) 2012-2016 Sergey Poznyakoff
Direvent 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 3 of the License, or (at your
option) any later version.
Direvent 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 direvent. If not, see <http://www.gnu.org/licenses/>. */
/* A standard "early-init" version of detach(). The initialization function
is called before fork. No special actions are needed to preserve the
initialized watchers' state across fork. */
#include "direvent.h"
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_PATHS_H
# include <paths.h>
#endif
#ifndef _PATH_DEVNULL
# define _PATH_DEVNULL "/dev/null"
#endif
int
detach(void (*init)())
{
struct sigaction oldsa, sa;
pid_t pid;
int ec;
init();
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
if (sigaction(SIGHUP, &sa, &oldsa))
return -1;
switch (fork()) {
case -1:
return -1;
case 0:
break;
default:
_exit(0);
}
pid = setsid();
ec = errno;
sigaction(SIGHUP, &oldsa, NULL);
if (pid == -1) {
errno = ec;
return -1;
}
chdir("/");
close(0);
close(1);
close(2);
open(_PATH_DEVNULL, O_RDONLY);
open(_PATH_DEVNULL, O_WRONLY);
dup(1);
return 0;
}
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