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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2019-2025 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This library 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <confpaths.h>
#include <fcntl.h>
#include <unistd.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <mailutils/util.h>
#include <mailutils/daemon.h>
int
mu_daemon (void)
{
int fd;
switch (fork ())
{
case 0:
break;
case -1:
return errno;
default:
_exit (0);
}
if (setsid () == (pid_t) -1)
return errno;
signal (SIGHUP, SIG_IGN);
switch (fork ())
{
case 0:
break;
case -1:
return errno;
default:
_exit (0);
}
chdir ("/");
mu_close_fds (0);
fd = open (PATH_DEVNULL, O_RDWR);
if (fd == 0)
{
dup2 (fd, 1);
dup2 (fd, 2);
}
else if (fd > 0)
{
/* This means that mu_close_fds failed to close stdin.
Shouldn't happen, but just in case ... */
dup2 (fd, 0);
dup2 (fd, 1);
dup2 (fd, 2);
close (fd);
}
return 0;
}
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