/**
* service_enabled - Should the service run?
* @svc: Pointer to &svc_t object
* @event: Dynamic event, opaque flag passed to callback
* @arg: Event argument, used only by external service plugins.
*
* This method calls an associated service callback, if registered by a
* plugin, and returns the &svc_cmd_t status. If no plugin is registered
* the service is statically enabled in /etc/finit.conf and the result
* will always be %SVC_START.
*
* Returns:
* Either one of %SVC_START, %SVC_STOP, %SVC_RELOAD.
*/
svc_cmd_t service_enabled(svc_t *svc, int event, void *arg)
{
if (!svc) {
errno = EINVAL;
return SVC_STOP;
}
if (!svc_in_runlevel(svc, runlevel))
return SVC_STOP;
/*
* Event conditions for services are ignored during bootstrap.
*/
if (runlevel && !event_service_cond(svc->events))
return SVC_STOP;
/* Is there a service plugin registered? */
if (svc->cb) {
int status;
pid_t pid;
/* Let callback run in separate process so it doesn't crash PID 1 */
pid = fork();
if (-1 == pid) {
_pe("Failed in %s callback", svc->cmd);
return SVC_STOP;
}
if (!pid) {
status = svc->cb(svc, event, arg);
exit(status);
}
if (waitpid(pid, &status, 0) == -1) {
_pe("Failed reading status from %s callback", svc->cmd);
return SVC_STOP;
}
/* Callback normally exits here. */
if (WIFEXITED(status))
return WEXITSTATUS(status);
/* Check for SEGFAULT or other error ... */
if (WIFSIGNALED(status) && WCOREDUMP(status))
_e("Callback to %s crashed!\n", svc->cmd);
else
_e("Callback to %s did not exit normally!\n", svc->cmd);
return SVC_STOP;
}
/* No service plugin, default to start, since listed in finit.conf */
return SVC_START;
}
/**
* service_runlevel - Change to a new runlevel
* @newlevel: New runlevel to activate
*
* Stops all services not in @newlevel and starts, or lets continue to run,
* those in @newlevel. Also updates @prevlevel and active @runlevel.
*/
void service_runlevel(int newlevel)
{
svc_t *svc;
if (runlevel == newlevel)
return;
if (newlevel < 0 || newlevel > 9)
return;
prevlevel = runlevel;
runlevel = newlevel;
_d("Setting new runlevel --> %d <-- previous %d", runlevel, prevlevel);
runlevel_set(prevlevel, newlevel);
/* Make sure to (re)load all *.conf in /etc/finit.d/ */
conf_reload_dynamic();
_d("Stopping services services not allowed in new runlevel ...");
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (!svc_in_runlevel(svc, runlevel)) {
#ifndef INETD_DISABLED
if (svc_is_inetd(svc))
inetd_stop(&svc->inetd);
else
#endif
service_stop(svc);
}
/* ... or disabled/removed services from /etc/finit.d/ */
if (svc_is_dynamic(svc) && svc_is_changed(svc))
service_stop(svc);
}
/* Prev runlevel services stopped, call hooks before starting new runlevel ... */
_d("All services have been stoppped, calling runlevel change hooks ...");
plugin_run_hooks(HOOK_RUNLEVEL_CHANGE); /* Reconfigure HW/VLANs/etc here */
_d("Starting services services new to this runlevel ...");
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
#ifndef INETD_DISABLED
/* Inetd services have slightly different semantics */
if (svc_is_inetd(svc)) {
if (svc_in_runlevel(svc, runlevel))
inetd_start(&svc->inetd);
continue;
}
#endif
/* All other services consult their callback here */
svc_dance(svc);
}
/* Cleanup stale services */
svc_clean_dynamic(service_unregister);
if (0 == runlevel) {
do_shutdown(SIGUSR2);
return;
}
if (6 == runlevel) {
do_shutdown(SIGUSR1);
return;
}
if (runlevel == 1)
touch("/etc/nologin"); /* Disable login in single-user mode */
else
erase("/etc/nologin");
if (0 != prevlevel)
tty_runlevel(runlevel);
}
/**
* service_enabled - Should the service run?
* @svc: Pointer to &svc_t object
* @event: Dynamic event, opaque flag passed to callback
* @arg: Event argument, used only by external service plugins.
*
* This method calls an associated service callback, if registered by a
* plugin, and returns the &svc_cmd_t status. If no plugin is registered
* the service is statically enabled in /etc/finit.conf and the result
* will always be %SVC_START.
*
* Returns:
* Either one of %SVC_START, %SVC_STOP, %SVC_RELOAD.
*/
svc_cmd_t service_enabled(svc_t *svc, int event, void *arg)
{
svc_cmd_t cmd = SVC_START; /* Default to start, since listed in finit.conf */
if (!svc) {
errno = EINVAL;
return SVC_STOP;
}
if (!svc_in_runlevel(svc, runlevel))
return SVC_STOP;
/*
* Event conditions for services are ignored during bootstrap.
*/
_d("Checking %s runlevel %d and events %s", svc->cmd, runlevel, svc->events);
if (runlevel && !event_service_cond(svc->events))
return SVC_STOP;
if (svc->state == SVC_RELOAD_STATE)
cmd = SVC_RELOAD;
if (svc->state == SVC_PAUSED_STATE)
cmd = SVC_STOP;
/* Is there a service plugin registered? */
if (svc->cb) {
int status;
pid_t pid;
/* Let callback run in separate process so it doesn't crash PID 1 */
pid = fork();
if (-1 == pid) {
_pe("Failed in %s callback", svc->cmd);
return SVC_STOP;
}
if (!pid)
_exit(svc->cb(svc, event, arg));
if (waitpid(pid, &status, 0) == -1) {
_pe("Failed reading status from %s callback", svc->cmd);
return SVC_STOP;
}
/* Callback normally exits here. */
if (WIFEXITED(status)) {
svc_cmd_t tmp = WEXITSTATUS(status);
return tmp == SVC_START ? cmd : tmp;
}
/* Check for SEGFAULT or other error ... */
if (WIFSIGNALED(status) && WCOREDUMP(status))
_e("Callback to %s crashed!\n", svc->cmd);
else
_e("Callback to %s did not exit normally!\n", svc->cmd);
return SVC_STOP;
}
_d("%s => %s", svc->cmd, (cmd == SVC_START
? "SVC_START"
: (cmd == SVC_RELOAD
? "SVC_RELOAD"
: "SVC_STOP")));
return cmd;
}
