int
main (int argc, char *argv[])
{
conf_t conf;
/* FIXME: Revamp signal handlers.
*/
if (posignal (SIGHUP, SIG_IGN) == SIG_ERR) {
log_err (EMUNGE_SNAFU, LOG_ERR, "Failed to ignore signal=%d", SIGHUP);
}
if (posignal (SIGPIPE, SIG_IGN) == SIG_ERR) {
log_err (EMUNGE_SNAFU, LOG_ERR, "Failed to ignore signal=%d", SIGPIPE);
}
/* Close stdin since it is not used.
*/
if (close (STDIN_FILENO) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR, "Failed to close standard input");
}
/* Set stdout to be line buffered.
*/
if (setvbuf (stdout, NULL, _IOLBF, 0) < 0) {
log_err (EMUNGE_SNAFU, LOG_ERR,
"Failed to line-buffer standard output");
}
log_open_file (stderr, argv[0], LOG_INFO, LOG_OPT_PRIORITY);
conf = create_conf ();
parse_cmdline (conf, argc, argv);
start_threads (conf);
process_creds (conf);
stop_threads (conf);
destroy_conf (conf);
log_close_file ();
exit (EMUNGE_SUCCESS);
}
static void
handle_signals (void)
{
if (posignal (SIGHUP, hup_handler) == SIG_ERR) {
log_err (EMUNGE_SNAFU, LOG_ERR, "Failed to handle signal=%d", SIGHUP);
}
if (posignal (SIGINT, exit_handler) == SIG_ERR) {
log_err (EMUNGE_SNAFU, LOG_ERR, "Failed to handle signal=%d", SIGINT);
}
if (posignal (SIGTERM, exit_handler) == SIG_ERR) {
log_err (EMUNGE_SNAFU, LOG_ERR, "Failed to handle signal=%d", SIGTERM);
}
if (posignal (SIGPIPE, SIG_IGN) == SIG_ERR) {
log_err (EMUNGE_SNAFU, LOG_ERR, "Failed to ignore signal=%d", SIGPIPE);
}
return;
}
static int
daemonize_init (char *progname)
{
/* Begins the daemonization of the process.
* Despite the fact that this routine backgrounds the process, control
* will not be returned to the shell until daemonize_fini() is called.
* Returns an 'fd' to pass to daemonize_fini() to complete the daemonization.
*/
int fds [2];
pid_t pid;
int n;
signed char priority;
char ebuf [1024];
/* Clear file mode creation mask.
*/
umask (0);
/* Create pipe for IPC so parent process will wait to terminate until
* signaled by grandchild process. This allows messages written to
* stdout/stderr by the grandchild to be properly displayed before
* the parent process returns control to the shell.
*/
if (pipe (fds) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR, "Failed to create daemon pipe");
}
/* Set the fd used by log_err() to return status back to the parent.
*/
log_set_err_pipe (fds[1]);
/* Automatically background the process and
* ensure child is not a process group leader.
*/
if ((pid = fork ()) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR, "Failed to create child process");
}
else if (pid > 0) {
log_set_err_pipe (-1);
if (close (fds[1]) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR,
"Failed to close write-pipe in parent process");
}
if ((n = read (fds[0], &priority, sizeof (priority))) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR,
"Failed to read status from grandchild process");
}
if ((n > 0) && (priority >= 0)) {
if ((n = read (fds[0], ebuf, sizeof (ebuf))) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR,
"Failed to read err msg from grandchild process");
}
if ((n > 0) && (ebuf[0] != '\0')) {
log_open_file (stderr, progname, priority, LOG_OPT_PRIORITY);
log_msg (priority, "%s", ebuf);
}
exit (EXIT_FAILURE);
}
exit (EXIT_SUCCESS);
}
if (close (fds[0]) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR,
"Failed to close read-pipe in child process");
}
/* Become a session leader and process group leader
* with no controlling tty.
*/
if (setsid () < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR,
"Failed to disassociate controlling tty");
}
/* Ignore SIGHUP to keep child from terminating when
* the session leader (ie, the parent) terminates.
*/
if (posignal (SIGHUP, SIG_IGN) == SIG_ERR) {
log_err (EMUNGE_SNAFU, LOG_ERR, "Failed to ignore signal=%d", SIGHUP);
}
/* Abdicate session leader position in order to guarantee
* daemon cannot automatically re-acquire a controlling tty.
*/
if ((pid = fork ()) < 0) {
log_errno (EMUNGE_SNAFU, LOG_ERR,
"Failed to create grandchild process");
}
else if (pid > 0) {
exit (EXIT_SUCCESS);
}
return (fds[1]);
}
