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/* $Id: daemonize.c 6395 2003-07-12 19:13:49Z rra $
**
** Become a long-running daemon.
**
** Usage:
**
** daemonize(path);
**
** Performs all of the various system-specific stuff required to become a
** long-running daemon. Also chdir to the provided path (which is where
** core dumps will go on most systems).
*/
#include "config.h"
#include "clibrary.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include "inn/messages.h"
#include "libinn.h"
void
daemonize(const char *path)
{
int status;
int fd;
/* Fork and exit in the parent to disassociate from the current process
group and become the leader of a new process group. */
status = fork();
if (status < 0)
sysdie("cant fork");
else if (status > 0)
_exit(0);
/* setsid() should take care of disassociating from the controlling
terminal, and FreeBSD at least doesn't like TIOCNOTTY if you don't
already have a controlling terminal. So only use the older TIOCNOTTY
method if setsid() isn't available. */
#if HAVE_SETSID
if (setsid() < 0)
syswarn("cant become session leader");
#elif defined(TIOCNOTTY)
fd = open("/dev/tty", O_RDWR);
if (fd >= 0) {
if (ioctl(fd, TIOCNOTTY, NULL) < 0)
syswarn("cant disassociate from the terminal");
close(fd);
}
#endif /* defined(TIOCNOTTY) */
if (chdir(path) < 0)
syswarn("cant chdir to %s", path);
fd = open("/dev/null", O_RDWR, 0);
if (fd != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > 2)
close(fd);
}
}
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