/* If daemonization is configured, then starts daemonization, by forking and
* returning in the child process. The parent process hangs around until the
* child lets it know either that it completed startup successfully (by calling
* daemon_complete()) or that it failed to start up (by exiting with a nonzero
* exit code). */
void
daemonize_start(void)
{
daemonize_fd = -1;
if (detach) {
if (fork_and_wait_for_startup(&daemonize_fd) > 0) {
/* Running in parent process. */
exit(0);
}
/* Running in daemon or monitor process. */
}
if (monitor) {
int saved_daemonize_fd = daemonize_fd;
pid_t daemon_pid;
daemon_pid = fork_and_wait_for_startup(&daemonize_fd);
if (daemon_pid > 0) {
/* Running in monitor process. */
fork_notify_startup(saved_daemonize_fd);
close_standard_fds();
monitor_daemon(daemon_pid);
}
/* Running in daemon process. */
}
make_pidfile();
/* Make sure that the unixctl commands for vlog get registered in a
* daemon, even before the first log message. */
vlog_init();
}
/* If daemonization is configured, then starts daemonization, by forking and
* returning in the child process. The parent process hangs around until the
* child lets it know either that it completed startup successfully (by calling
* daemon_complete()) or that it failed to start up (by exiting with a nonzero
* exit code). */
void
daemonize_start(bool access_datapath)
{
assert_single_threaded();
daemonize_fd = -1;
if (switch_user) {
daemon_become_new_user__(access_datapath);
switch_user = false;
}
if (detach) {
pid_t pid;
if (fork_and_wait_for_startup(&daemonize_fd, &pid)) {
VLOG_FATAL("could not detach from foreground session");
}
if (pid > 0) {
/* Running in parent process. */
exit(0);
}
/* Running in daemon or monitor process. */
setsid();
}
if (monitor) {
int saved_daemonize_fd = daemonize_fd;
pid_t daemon_pid;
if (fork_and_wait_for_startup(&daemonize_fd, &daemon_pid)) {
VLOG_FATAL("could not initiate process monitoring");
}
if (daemon_pid > 0) {
/* Running in monitor process. */
fork_notify_startup(saved_daemonize_fd);
if (detach) {
close_standard_fds();
}
monitor_daemon(daemon_pid);
}
/* Running in daemon process. */
}
forbid_forking("running in daemon process");
if (pidfile) {
make_pidfile();
}
/* Make sure that the unixctl commands for vlog get registered in a
* daemon, even before the first log message. */
vlog_init();
}
/* If daemonization is configured, then this function notifies the parent
* process that the child process has completed startup successfully. It also
* call daemonize_post_detach().
*
* Calling this function more than once has no additional effect. */
void
daemonize_complete(void)
{
if (!detached) {
detached = true;
fork_notify_startup(daemonize_fd);
daemonize_fd = -1;
daemonize_post_detach();
}
}
/* If daemonization is configured, then this function notifies the parent
* process that the child process has completed startup successfully. */
void
daemonize_complete(void)
{
fork_notify_startup(daemonize_fd);
if (detach) {
setsid();
if (chdir_) {
ignore(chdir("/"));
}
close_standard_fds();
}
}
/* If daemonization is configured, then this function notifies the parent
* process that the child process has completed startup successfully. It also
* call daemonize_post_detach().
*
* Calling this function more than once has no additional effect. */
void
daemonize_complete(void)
{
if (pidfile) {
free(pidfile);
pidfile = NULL;
}
if (!detached) {
detached = true;
fork_notify_startup(daemonize_fd);
daemonize_fd = -1;
daemonize_post_detach();
}
}