/**
* svc_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 svc_runlevel (int newlevel)
{
svc_t *svc;
if (runlevel == newlevel)
return;
if (newlevel > 5 || newlevel < 1)
return;
prevlevel = runlevel;
runlevel = newlevel;
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
int run = svc_enabled(svc, 0, NULL);
if (svc->pid) {
if (run == SVC_STOP)
svc_stop(svc);
} else {
if (run == SVC_START)
svc_start(svc);
}
}
if (runlevel == 1)
touch("/etc/nologin"); /* Disable login in single-user mode */
else
remove("/etc/nologin");
}
void svc_monitor(pid_t lost)
{
svc_t *svc;
if (was_stopped && !is_norespawn()) {
was_stopped = 0;
restart_any_lost_procs();
return;
}
if (fexist(SYNC_SHUTDOWN) || lost <= 1)
return;
/* Power user at the console, don't respawn tasks. */
if (is_norespawn()) {
was_stopped = 1;
return;
}
if (tty_respawn(lost))
return;
#ifndef INETD_DISABLED
if (inetd_respawn(lost))
return;
#endif
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (lost != svc->pid)
continue;
if (SVC_CMD_SERVICE != svc->type) {
svc->pid = 0;
continue;
}
_d("Ouch, lost pid %d - %s(%d)", lost, basename(svc->cmd), svc->pid);
/* No longer running, update books. */
svc->pid = 0;
if (sig_stopped()) {
_e("Stopped, not respawning killed processes.");
break;
}
/* Cleanup any lingering or semi-restarting tasks before respawning */
_d("Sending SIGTERM to service group %s", basename(svc->cmd));
procname_kill(basename(svc->cmd), SIGTERM);
/* Restarting lost service. */
if (svc_enabled(svc, 0, NULL)) {
svc->restart_counter++;
svc_start(svc);
}
break;
}
}
/**
* svc_find_by_pid - Find an service object by its PID
* @pid: Process ID to match
*
* Returns:
* A pointer to an &svc_t object, or %NULL if not found.
*/
svc_t *svc_find_by_pid(pid_t pid)
{
svc_t *svc;
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (svc->pid == pid)
return svc;
}
return NULL;
}
/**
* svc_find - Find a service object by its full path name
* @path: Full path name, e.g., /sbin/syslogd
*
* Returns:
* A pointer to an &svc_t object, or %NULL if not found.
*/
svc_t *svc_find(char *path)
{
svc_t *svc;
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (!strncmp(path, svc->cmd, strlen(svc->cmd))) {
_d("Found a matching svc for %s", path);
return svc;
}
}
return NULL;
}
/*
* Assert condition only if the service is running, but not if it's
* recently been changed or while it's starting up.
*
* We must wait for the service to create/touch its pidfile.
*/
static void pidfile_reconf(void *_null)
{
static char name[MAX_ARG_LEN];
svc_t *svc;
(void)(_null);
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (svc->state == SVC_RUNNING_STATE && !svc_is_changed(svc) && !svc_is_starting(svc)) {
snprintf(name, MAX_ARG_LEN, "svc%s", svc->cmd);
cond_set_path(cond_path(name), COND_ON);
}
}
}
void svc_start_all(void)
{
svc_t *svc;
svc_cmd_t cmd;
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
cmd = svc_enabled(svc, 0, NULL);
if (SVC_START == cmd || (SVC_RELOAD == cmd && svc->pid == 0))
svc_start(svc);
else if (SVC_RELOAD == cmd)
svc_reload(svc);
}
_d("Running svc up hooks ...");
plugin_run_hooks(HOOK_SVC_UP);
}
static void restart_lost_procs(void)
{
svc_t *svc;
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (svc->pid > 0 && pid_alive(svc->pid))
continue;
/* Only restart lost daemons, not task/run/inetd services */
if (SVC_TYPE_SERVICE != svc->type) {
svc->pid = 0;
continue;
}
service_start(svc);
}
}
/**
* service_bootstrap - Start bootstrap services and tasks
*
* System startup, runlevel S, where only services, tasks and
* run commands absolutely essential to bootstrap are located.
*/
void service_bootstrap(void)
{
svc_t *svc;
_d("Bootstrapping all services in runlevel S from %s", FINIT_CONF);
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
svc_cmd_t cmd;
/* Inetd services cannot be part of bootstrap currently. */
if (svc_is_inetd(svc))
continue;
cmd = service_enabled(svc, 0, NULL);
if (SVC_START == cmd || (SVC_RELOAD == cmd))
service_start(svc);
}
}
void svc_monitor(void)
{
pid_t lost;
svc_t *svc;
lost = waitpid(-1, NULL, WNOHANG);
if (lost < 1)
return;
if (fexist(SYNC_SHUTDOWN) || lost <= 1)
return;
/* Power user at the console, don't respawn tasks. */
if (is_norespawn())
return;
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
char *name = basename(svc->cmd);
if (lost != svc->pid)
continue;
_d("Ouch, lost pid %d - %s(%d)", lost, name, svc->pid);
/* No longer running, update books. */
svc->pid = 0;
if (sig_stopped()) {
_e("Stopped, not respawning killed processes.");
break;
}
/* Cleanup any lingering or semi-restarting tasks before respawning */
_d("Sending SIGTERM to service group %s", name);
procname_kill(name, SIGTERM);
/* Restarting lost service. */
if (svc_enabled(svc, 0, NULL)) {
svc->stat_restart_counter++;
svc_start(svc);
}
break;
}
}
svc_t *svc_find_inetd(char *path, char *service, char *proto, char *port)
{
svc_t *svc;
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (svc->type != SVC_CMD_INETD)
continue;
if (strncmp(path, svc->cmd, strlen(svc->cmd)))
continue;
if (inetd_match(&svc->inetd, service, proto, port)) {
_d("Found a matching svc for %s", path);
return svc;
}
}
return NULL;
}
/* In verbose mode we skip the header and each service description.
* This in favor of having all info on one line so a machine can more
* easily parse it. */
static int show_status(char *UNUSED(arg))
{
svc_t *svc;
/* Fetch UTMP runlevel, needed for svc_status() call below */
runlevel = runlevel_get();
if (!verbose) {
printf("# Status PID Runlevels Service Description\n");
printf("====================================================================================\n");
}
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
int inetd = svc_is_inetd(svc);
char jobid[10], args[512] = "";
struct init_request rq = {
.magic = INIT_MAGIC,
.cmd = INIT_CMD_QUERY_INETD,
};
if (svc_is_unique(svc))
snprintf(jobid, sizeof(jobid), "%d", svc->job);
else
snprintf(jobid, sizeof(jobid), "%d:%d", svc->job, svc->id);
printf("%-5s %7s %-6d %-9s ", jobid, svc_status(svc), svc->pid, runlevel_string(svc->runlevels));
if (!verbose) {
printf("%-20s %s\n", svc->cmd, svc->desc);
continue;
}
if (inetd) {
char *info;
snprintf(rq.data, sizeof(rq.data), "%s", jobid);
if (do_send(&rq, sizeof(rq))) {
snprintf(args, sizeof(args), "Unknown inetd");
info = args;
} else {
info = rq.data;
if (strcmp("internal", svc->cmd)) {
char *ptr = strchr(info, ' ');
if (ptr)
info = ptr + 1;
}
}
printf("%s %s\n", svc->cmd, info);
} else {
int i;
for (i = 1; i < MAX_NUM_SVC_ARGS; i++) {
strlcat(args, svc->args[i], sizeof(args));
strlcat(args, " ", sizeof(args));
}
printf("%s %s\n", svc->cmd, args);
}
}
return 0;
}
void service_monitor(pid_t lost)
{
svc_t *svc;
static int was_stopped = 0;
if (was_stopped && !is_norespawn()) {
was_stopped = 0;
restart_lost_procs();
return;
}
if (fexist(SYNC_SHUTDOWN) || lost <= 1)
return;
/* Power user at the console, don't respawn tasks. */
if (is_norespawn()) {
was_stopped = 1;
return;
}
if (tty_respawn(lost))
return;
#ifndef INETD_DISABLED
if (inetd_respawn(lost))
return;
#endif
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
if (lost != svc->pid)
continue;
if (SVC_TYPE_SERVICE != svc->type) {
svc->pid = 0;
continue;
}
_d("Ouch, lost pid %d - %s(%d)", lost, basename(svc->cmd), svc->pid);
/* No longer running, update books. */
svc->pid = 0;
if (sig_stopped()) {
_e("Stopped, not respawning killed processes.");
break;
}
/* Restarting lost service. */
if (service_enabled(svc, 0, NULL)) {
if (svc->restart_counter > RESPAWN_MAX) {
_e("Not restarting %s id %d, respawn MAX (%d) reached!",
svc->cmd, svc->id, RESPAWN_MAX);
break;
}
svc->restart_counter++;
service_start(svc);
}
break;
}
}
/**
* 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);
}
/**
* svc_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 svc_runlevel(int newlevel)
{
svc_t *svc;
if (runlevel == newlevel)
return;
if (newlevel < 0 || newlevel > 9)
return;
prevlevel = runlevel;
runlevel = newlevel;
utmp_save(prevlevel, newlevel);
_d("Setting new runlevel --> %d <-- previous %d", runlevel, prevlevel);
for (svc = svc_iterator(1); svc; svc = svc_iterator(0)) {
svc_cmd_t cmd;
/* Inetd services have slightly different semantics */
#ifndef INETD_DISABLED
if (svc->type == SVC_CMD_INETD) {
if (!ISSET(svc->runlevels, runlevel))
inetd_stop(&svc->inetd);
else
inetd_start(&svc->inetd);
continue;
}
#endif
/* All other services consult their callback here */
cmd = svc_enabled(svc, 0, NULL);
if (svc->pid) {
if (cmd == SVC_STOP)
svc_stop(svc);
else if (cmd == SVC_RELOAD)
svc_reload(svc);
} else {
if (cmd == SVC_START)
svc_start(svc);
}
}
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);
}