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Systemd/service.c

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/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <signal.h>
#include <dirent.h>
#include <unistd.h>
#include "unit.h"
#include "service.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
#include "strv.h"
#define COMMENTS "#;\n"
#define NEWLINES "\n\r"
#define LINE_MAX 4096
static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
[SERVICE_DEAD] = UNIT_INACTIVE,
[SERVICE_START_PRE] = UNIT_ACTIVATING,
[SERVICE_START] = UNIT_ACTIVATING,
[SERVICE_START_POST] = UNIT_ACTIVATING,
[SERVICE_RUNNING] = UNIT_ACTIVE,
[SERVICE_RELOAD] = UNIT_ACTIVE_RELOADING,
[SERVICE_STOP] = UNIT_DEACTIVATING,
[SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
[SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
[SERVICE_STOP_POST] = UNIT_DEACTIVATING,
[SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
[SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
[SERVICE_MAINTAINANCE] = UNIT_INACTIVE,
[SERVICE_AUTO_RESTART] = UNIT_ACTIVATING,
};
static void service_done(Unit *u) {
Service *s = SERVICE(u);
assert(s);
free(s->pid_file);
s->pid_file = NULL;
free(s->sysv_path);
s->sysv_path = NULL;
exec_context_done(&s->exec_context);
exec_command_free_array(s->exec_command, _SERVICE_EXEC_MAX);
s->control_command = NULL;
/* This will leak a process, but at least no memory or any of
* our resources */
if (s->main_pid > 0) {
unit_unwatch_pid(u, s->main_pid);
s->main_pid = 0;
}
if (s->control_pid > 0) {
unit_unwatch_pid(u, s->control_pid);
s->control_pid = 0;
}
unit_unwatch_timer(u, &s->timer_watch);
}
static int sysv_translate_name(const char *name, char **_r) {
static const char * const table[] = {
"$local_fs", SPECIAL_LOCAL_FS_TARGET,
"$network", SPECIAL_NETWORK_TARGET,
"$named", SPECIAL_NSS_LOOKUP_TARGET,
"$portmap", SPECIAL_RPCBIND_TARGET,
"$remote_fs", SPECIAL_REMOTE_FS_TARGET,
"$syslog", SPECIAL_SYSLOG_TARGET,
"$time", SPECIAL_RTC_SET_TARGET
};
unsigned i;
char *r;
for (i = 0; i < ELEMENTSOF(table); i += 2)
if (streq(table[i], name)) {
if (!(r = strdup(table[i+1])))
return -ENOMEM;
goto finish;
}
if (*name == '$')
return 0;
if (asprintf(&r, "%s.service", name) < 0)
return -ENOMEM;
finish:
if (_r)
*_r = r;
return 1;
}
static int sysv_chkconfig_order(Service *s) {
Meta *other;
int r;
assert(s);
if (s->sysv_start_priority < 0)
return 0;
/* If no LSB header is found we try to order init scripts via
* the start priority of the chkconfig header. */
LIST_FOREACH(units_per_type, other, UNIT(s)->meta.manager->units_per_type[UNIT_SERVICE]) {
Service *t;
UnitDependency d;
t = (Service*) other;
if (s == t)
continue;
if (t->sysv_start_priority < 0)
continue;
if (t->sysv_start_priority < s->sysv_start_priority)
d = UNIT_AFTER;
else if (t->sysv_start_priority > s->sysv_start_priority)
d = UNIT_BEFORE;
else
continue;
/* FIXME: Maybe we should compare the name here lexicographically? */
if (!(r = unit_add_dependency(UNIT(s), d, UNIT(t))) < 0)
return r;
}
return 0;
}
static ExecCommand *exec_command_new(const char *path, const char *arg1) {
ExecCommand *c;
if (!(c = new0(ExecCommand, 1)))
return NULL;
if (!(c->path = strdup(path))) {
free(c);
return NULL;
}
if (!(c->argv = strv_new(path, arg1, NULL))) {
free(c->path);
free(c);
return NULL;
}
return c;
}
static int sysv_exec_commands(Service *s) {
ExecCommand *c;
assert(s);
assert(s->sysv_path);
if (!(c = exec_command_new(s->sysv_path, "start")))
return -ENOMEM;
exec_command_append_list(s->exec_command+SERVICE_EXEC_START, c);
if (!(c = exec_command_new(s->sysv_path, "stop")))
return -ENOMEM;
exec_command_append_list(s->exec_command+SERVICE_EXEC_STOP, c);
if (!(c = exec_command_new(s->sysv_path, "reload")))
return -ENOMEM;
exec_command_append_list(s->exec_command+SERVICE_EXEC_RELOAD, c);
return 0;
}
static int service_load_sysv_path(Service *s, const char *path) {
FILE *f;
Unit *u;
unsigned line = 0;
int r;
enum {
NORMAL,
DESCRIPTION,
LSB,
LSB_DESCRIPTION
} state = NORMAL;
bool has_lsb = false;
u = UNIT(s);
if (!(f = fopen(path, "re"))) {
r = errno == ENOENT ? 0 : -errno;
goto finish;
}
s->type = SERVICE_FORKING;
s->restart = SERVICE_ONCE;
free(s->sysv_path);
if (!(s->sysv_path = strdup(path))) {
r = -ENOMEM;
goto finish;
}
while (!feof(f)) {
char l[LINE_MAX], *t;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
r = -errno;
log_error("Failed to read configuration file '%s': %s", path, strerror(-r));
goto finish;
}
line++;
t = strstrip(l);
if (*t != '#')
continue;
if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) {
state = LSB;
has_lsb = true;
continue;
}
if ((state == LSB_DESCRIPTION || state == LSB) && streq(t, "### END INIT INFO")) {
state = NORMAL;
continue;
}
t++;
t += strspn(t, WHITESPACE);
if (state == NORMAL) {
/* Try to parse Red Hat style chkconfig headers */
if (startswith(t, "chkconfig:")) {
int start_priority;
state = NORMAL;
if (sscanf(t+10, "%*15s %i %*i",
&start_priority) != 1) {
log_warning("[%s:%u] Failed to parse chkconfig line. Ignoring.", path, line);
continue;
}
if (start_priority < 0 || start_priority > 99) {
log_warning("[%s:%u] Start priority out of range. Ignoring.", path, line);
continue;
}
s->sysv_start_priority = start_priority;
} else if (startswith(t, "description:")) {
size_t k = strlen(t);
char *d;
if (t[k-1] == '\\') {
state = DESCRIPTION;
t[k-1] = 0;
}
if (!(d = strdup(strstrip(t+12)))) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else if (startswith(t, "pidfile:")) {
char *fn;
state = NORMAL;
fn = strstrip(t+8);
if (!path_is_absolute(fn)) {
log_warning("[%s:%u] PID file not absolute. Ignoring.", path, line);
continue;
}
if (!(fn = strdup(fn))) {
r = -ENOMEM;
goto finish;
}
free(s->pid_file);
s->pid_file = fn;
}
} else if (state == DESCRIPTION) {
/* Try to parse Red Hat style description
* continuation */
size_t k = strlen(t);
char *d;
if (t[k-1] == '\\')
t[k-1] = 0;
else
state = NORMAL;
assert(u->meta.description);
if (asprintf(&d, "%s %s", u->meta.description, strstrip(t)) < 0) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else if (state == LSB || state == LSB_DESCRIPTION) {
if (startswith(t, "Provides:")) {
char *i, *w;
size_t z;
state = LSB;
FOREACH_WORD(w, z, t+9, i) {
char *n, *m;
if (!(n = strndup(w, z))) {
r = -ENOMEM;
goto finish;
}
r = sysv_translate_name(n, &m);
free(n);
if (r < 0)
goto finish;
if (r == 0)
continue;
r = unit_add_name(u, m);
free(m);
if (r < 0)
goto finish;
}
} else if (startswith(t, "Required-Start:") ||
startswith(t, "Should-Start:")) {
char *i, *w;
size_t z;
state = LSB;
FOREACH_WORD(w, z, strchr(t, ':')+1, i) {
char *n, *m;
if (!(n = strndup(w, z))) {
r = -ENOMEM;
goto finish;
}
r = sysv_translate_name(n, &m);
free(n);
if (r < 0)
goto finish;
if (r == 0)
continue;
if (!(r = unit_add_dependency_by_name(u, UNIT_AFTER, m)) < 0) {
free(m);
goto finish;
}
r = unit_add_dependency_by_name(
u,
startswith(t, "Required-Start:") ? UNIT_REQUIRES : UNIT_WANTS,
m);
free(m);
if (r < 0)
goto finish;
}
} else if (startswith(t, "Description:")) {
char *d;
state = LSB_DESCRIPTION;
if (!(d = strdup(strstrip(t+12)))) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else if (startswith(t, "Short-Description:") && !u->meta.description) {
char *d;
/* We use the short description only
* if no long description is set. */
state = LSB;
if (!(d = strdup(strstrip(t+18)))) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else if (state == LSB_DESCRIPTION) {
if (startswith(l, "#\t") || startswith(l, "# ")) {
char *d;
assert(u->meta.description);
if (asprintf(&d, "%s %s", u->meta.description, t) < 0) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else
state = LSB;
}
}
}
/* If the init script has no LSB header, then let's
* enforce the ordering via the chkconfig
* priorities */
if (!has_lsb)
if ((r = sysv_chkconfig_order(s)) < 0)
goto finish;
if ((r = sysv_exec_commands(s)) < 0)
goto finish;
r = 1;
finish:
if (f)
fclose(f);
return r;
}
static int service_load_sysv_name(Service *s, const char *name) {
char **p;
assert(s);
assert(name);
STRV_FOREACH(p, UNIT(s)->meta.manager->sysvinit_path) {
char *path;
int r;
if (asprintf(&path, "%s/%s", *p, name) < 0)
return -ENOMEM;
assert(endswith(path, ".service"));
path[strlen(path)-8] = 0;
r = service_load_sysv_path(s, path);
free(path);
if (r >= 0)
return r;
}
return 0;
}
static int service_load_sysv(Service *s) {
const char *t;
Iterator i;
int r;
assert(s);
/* Load service data from SysV init scripts, preferably with
* LSB headers ... */
if (strv_isempty(UNIT(s)->meta.manager->sysvinit_path))
return 0;
if ((t = unit_id(UNIT(s))))
if ((r = service_load_sysv_name(s, t)) != 0)
return r;
SET_FOREACH(t, UNIT(s)->meta.names, i)
if ((r == service_load_sysv_name(s, t)) != 0)
return r;
return 0;
}
static int service_init(Unit *u) {
int r;
Service *s = SERVICE(u);
assert(s);
/* First, reset everything to the defaults, in case this is a
* reload */
s->type = 0;
s->restart = 0;
s->timeout_usec = DEFAULT_TIMEOUT_USEC;
s->restart_usec = DEFAULT_RESTART_USEC;
exec_context_init(&s->exec_context);
s->timer_watch.type = WATCH_INVALID;
s->state = SERVICE_DEAD;
s->sysv_start_priority = -1;
s->permissions_start_only = false;
s->root_directory_start_only = false;
RATELIMIT_INIT(s->ratelimit, 10*USEC_PER_SEC, 5);
/* Load a .service file */
if ((r = unit_load_fragment(u)) < 0) {
service_done(u);
return r;
}
/* Load a classic init script as a fallback, if we couldn*t find anything */
if (r == 0)
if ((r = service_load_sysv(s)) <= 0) {
service_done(u);
return r < 0 ? r : -ENOENT;
}
/* Load dropin directory data */
if ((r = unit_load_dropin(u)) < 0) {
service_done(u);
return r;
}
return 0;
}
static void service_dump(Unit *u, FILE *f, const char *prefix) {
ServiceExecCommand c;
Service *s = SERVICE(u);
const char *prefix2;
char *p2;
assert(s);
p2 = strappend(prefix, "\t");
prefix2 = p2 ? p2 : prefix;
fprintf(f,
"%sService State: %s\n"
"%sPermissionsStartOnly: %s\n"
"%sRootDirectoryStartOnly: %s\n",
prefix, service_state_to_string(s->state),
prefix, yes_no(s->permissions_start_only),
prefix, yes_no(s->root_directory_start_only));
if (s->pid_file)
fprintf(f,
"%sPIDFile: %s\n",
prefix, s->pid_file);
exec_context_dump(&s->exec_context, f, prefix);
for (c = 0; c < _SERVICE_EXEC_MAX; c++) {
if (!s->exec_command[c])
continue;
fprintf(f, "%s→ %s:\n",
prefix, service_exec_command_to_string(c));
exec_command_dump_list(s->exec_command[c], f, prefix2);
}
if (s->sysv_path)
fprintf(f,
"%sSysV Init Script Path: %s\n",
prefix, s->sysv_path);
if (s->sysv_start_priority >= 0)
fprintf(f,
"%sSysV Start Priority: %i\n",
prefix, s->sysv_start_priority);
free(p2);
}
static int service_load_pid_file(Service *s) {
char *k;
unsigned long p;
int r;
assert(s);
if (s->main_pid_known)
return 0;
if (!s->pid_file)
return -ENOENT;
if ((r = read_one_line_file(s->pid_file, &k)) < 0)
return r;
if ((r = safe_atolu(k, &p)) < 0) {
free(k);
return r;
}
if ((unsigned long) (pid_t) p != p)
return -ERANGE;
s->main_pid = p;
s->main_pid_known = true;
return 0;
}
static int service_get_sockets(Service *s, Set **_set) {
Set *set;
Iterator i;
char *t;
int r;
assert(s);
assert(_set);
/* Collects all Socket objects that belong to this
* service. Note that a service might have multiple sockets
* via multiple names. */
if (!(set = set_new(NULL, NULL)))
return -ENOMEM;
SET_FOREACH(t, UNIT(s)->meta.names, i) {
char *k;
Unit *p;
/* Look for all socket objects that go by any of our
* units and collect their fds */
if (!(k = unit_name_change_suffix(t, ".socket"))) {
r = -ENOMEM;
goto fail;
}
p = manager_get_unit(UNIT(s)->meta.manager, k);
free(k);
if (!p) continue;
if ((r = set_put(set, p)) < 0)
goto fail;
}
*_set = set;
return 0;
fail:
set_free(set);
return r;
}
static int service_notify_sockets(Service *s) {
Iterator i;
Set *set;
Socket *sock;
int r;
assert(s);
/* Notifies all our sockets when we die */
if ((r = service_get_sockets(s, &set)) < 0)
return r;
SET_FOREACH(sock, set, i)
socket_notify_service_dead(sock);
set_free(set);
return 0;
}
static void service_set_state(Service *s, ServiceState state) {
ServiceState old_state;
assert(s);
old_state = s->state;
s->state = state;
if (state != SERVICE_START_PRE &&
state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL &&
state != SERVICE_STOP_POST &&
state != SERVICE_FINAL_SIGTERM &&
state != SERVICE_FINAL_SIGKILL &&
state != SERVICE_AUTO_RESTART)
unit_unwatch_timer(UNIT(s), &s->timer_watch);
if (state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RUNNING &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL)
if (s->main_pid > 0) {
unit_unwatch_pid(UNIT(s), s->main_pid);
s->main_pid = 0;
}
if (state != SERVICE_START_PRE &&
state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL &&
state != SERVICE_STOP_POST &&
state != SERVICE_FINAL_SIGTERM &&
state != SERVICE_FINAL_SIGKILL)
if (s->control_pid > 0) {
unit_unwatch_pid(UNIT(s), s->control_pid);
s->control_pid = 0;
}
if (state != SERVICE_START_PRE &&
state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_POST)
s->control_command = NULL;
if (state == SERVICE_DEAD ||
state == SERVICE_STOP ||
state == SERVICE_STOP_SIGTERM ||
state == SERVICE_STOP_SIGKILL ||
state == SERVICE_STOP_POST ||
state == SERVICE_FINAL_SIGTERM ||
state == SERVICE_FINAL_SIGKILL ||
state == SERVICE_MAINTAINANCE ||
state == SERVICE_AUTO_RESTART)
service_notify_sockets(s);
log_debug("%s changed %s → %s", unit_id(UNIT(s)), service_state_to_string(old_state), service_state_to_string(state));
unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
}
static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
Iterator i;
int r;
int *rfds = NULL;
unsigned rn_fds = 0;
Set *set;
Socket *sock;
assert(s);
assert(fds);
assert(n_fds);
if ((r = service_get_sockets(s, &set)) < 0)
return r;
SET_FOREACH(sock, set, i) {
int *cfds;
unsigned cn_fds;
if ((r = socket_collect_fds(sock, &cfds, &cn_fds)) < 0)
goto fail;
if (!cfds)
continue;
if (!rfds) {
rfds = cfds;
rn_fds = cn_fds;
} else {
int *t;
if (!(t = new(int, rn_fds+cn_fds))) {
free(cfds);
r = -ENOMEM;
goto fail;
}
memcpy(t, rfds, rn_fds);
memcpy(t+rn_fds, cfds, cn_fds);
free(rfds);
free(cfds);
rfds = t;
rn_fds = rn_fds+cn_fds;
}
}
*fds = rfds;
*n_fds = rn_fds;
set_free(set);
return 0;
fail:
set_free(set);
free(rfds);
return r;
}
static int service_spawn(
Service *s,
ExecCommand *c,
bool timeout,
bool pass_fds,
bool apply_permissions,
bool apply_chroot,
pid_t *_pid) {
pid_t pid;
int r;
int *fds = NULL;
unsigned n_fds = 0;
assert(s);
assert(c);
assert(_pid);
if (pass_fds)
if ((r = service_collect_fds(s, &fds, &n_fds)) < 0)
goto fail;
if (timeout) {
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
goto fail;
} else
unit_unwatch_timer(UNIT(s), &s->timer_watch);
if ((r = exec_spawn(c,
&s->exec_context,
fds, n_fds,
apply_permissions,
apply_chroot,
&pid)) < 0)
goto fail;
if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
/* FIXME: we need to do something here */
goto fail;
free(fds);
*_pid = pid;
return 0;
fail:
free(fds);
if (timeout)
unit_unwatch_timer(UNIT(s), &s->timer_watch);
return r;
}
static void service_enter_dead(Service *s, bool success, bool allow_restart) {
int r;
assert(s);
if (!success)
s->failure = true;
if (allow_restart &&
(s->restart == SERVICE_RESTART_ALWAYS ||
(s->restart == SERVICE_RESTART_ON_SUCCESS && !s->failure))) {
if ((r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch)) < 0)
goto fail;
service_set_state(s, SERVICE_AUTO_RESTART);
} else
service_set_state(s, s->failure ? SERVICE_MAINTAINANCE : SERVICE_DEAD);
return;
fail:
log_warning("%s failed to run install restart timer: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_dead(s, false, false);
}
static void service_enter_signal(Service *s, ServiceState state, bool success);
static void service_enter_stop_post(Service *s, bool success) {
int r;
assert(s);
if (!success)
s->failure = true;
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST]))
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_STOP_POST);
if (!s->control_command)
service_enter_dead(s, true, true);
return;
fail:
log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
}
static void service_enter_signal(Service *s, ServiceState state, bool success) {
int r;
bool sent = false;
assert(s);
if (!success)
s->failure = true;
if (s->main_pid > 0 || s->control_pid > 0) {
int sig;
sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
r = 0;
if (s->main_pid > 0) {
if (kill(s->main_pid, sig) < 0 && errno != ESRCH)
r = -errno;
else
sent = true;
}
if (s->control_pid > 0) {
if (kill(s->control_pid, sig) < 0 && errno != ESRCH)
r = -errno;
else
sent = true;
}
if (r < 0)
goto fail;
}
service_set_state(s, state);
if (s->main_pid <= 0 && s->control_pid <= 0)
service_enter_dead(s, true, true);
return;
fail:
log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
if (sent) {
s->failure = true;
service_set_state(s, state);
} else if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
service_enter_stop_post(s, false);
else
service_enter_dead(s, false, true);
}
static void service_enter_stop(Service *s, bool success) {
int r;
assert(s);
if (!success)
s->failure = true;
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP]))
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_STOP);
if (!s->control_command)
service_enter_signal(s, SERVICE_STOP_SIGTERM, true);
return;
fail:
log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
}
static void service_enter_start_post(Service *s) {
int r;
assert(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST]))
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_START_POST);
if (!s->control_command)
service_set_state(s, SERVICE_RUNNING);
return;
fail:
log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_stop(s, false);
}
static void service_enter_start(Service *s) {
pid_t pid;
int r;
assert(s);
assert(s->exec_command[SERVICE_EXEC_START]);
assert(!s->exec_command[SERVICE_EXEC_START]->command_next);
if ((r = service_spawn(s,
s->exec_command[SERVICE_EXEC_START],
s->type == SERVICE_FORKING,
true,
true,
true,
&pid)) < 0)
goto fail;
service_set_state(s, SERVICE_START);
if (s->type == SERVICE_SIMPLE) {
/* For simple services we immediately start
* the START_POST binaries. */
s->main_pid = pid;
s->main_pid_known = true;
service_enter_start_post(s);
} else if (s->type == SERVICE_FORKING) {
/* For forking services we wait until the start
* process exited. */
s->control_pid = pid;
s->control_command = s->exec_command[SERVICE_EXEC_START];
} else if (s->type == SERVICE_FINISH) {
/* For finishing services we wait until the start
* process exited, too, but it is our main process. */
s->main_pid = pid;
s->control_command = s->exec_command[SERVICE_EXEC_START];
} else
assert_not_reached("Unknown service type");
return;
fail:
log_warning("%s failed to run start exectuable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_stop(s, false);
}
static void service_enter_start_pre(Service *s) {
int r;
assert(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE]))
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_START_PRE);
if (!s->control_command)
service_enter_start(s);
return;
fail:
log_warning("%s failed to run start-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_dead(s, false, true);
}
static void service_enter_restart(Service *s) {
int r;
assert(s);
if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s), JOB_FAIL, false, NULL)) < 0)
goto fail;
log_debug("%s scheduled restart job.", unit_id(UNIT(s)));
service_enter_dead(s, true, false);
return;
fail:
log_warning("%s failed to schedule restart job: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_dead(s, false, false);
}
static void service_enter_reload(Service *s) {
int r;
assert(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD]))
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_RELOAD);
if (!s->control_command)
service_set_state(s, SERVICE_RUNNING);
return;
fail:
log_warning("%s failed to run reload executable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_stop(s, false);
}
static void service_run_next(Service *s, bool success) {
int r;
assert(s);
assert(s->control_command);
assert(s->control_command->command_next);
if (!success)
s->failure = true;
s->control_command = s->control_command->command_next;
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
&s->control_pid)) < 0)
goto fail;
return;
fail:
log_warning("%s failed to run spawn next executable: %s", unit_id(UNIT(s)), strerror(-r));
if (s->state == SERVICE_STOP)
service_enter_stop_post(s, false);
else if (s->state == SERVICE_STOP_POST)
service_enter_dead(s, false, true);
else
service_enter_stop(s, false);
}
static int service_start(Unit *u) {
Service *s = SERVICE(u);
assert(s);
/* We cannot fulfill this request right now, try again later
* please! */
if (s->state == SERVICE_STOP ||
s->state == SERVICE_STOP_SIGTERM ||
s->state == SERVICE_STOP_SIGKILL ||
s->state == SERVICE_STOP_POST ||
s->state == SERVICE_FINAL_SIGTERM ||
s->state == SERVICE_FINAL_SIGKILL)
return -EAGAIN;
/* Already on it! */
if (s->state == SERVICE_START_PRE ||
s->state == SERVICE_START ||
s->state == SERVICE_START_POST)
return 0;
assert(s->state == SERVICE_DEAD || s->state == SERVICE_MAINTAINANCE || s->state == SERVICE_AUTO_RESTART);
/* Make sure we don't enter a busy loop of some kind. */
if (!ratelimit_test(&s->ratelimit)) {
log_warning("%s start request repeated too quickly, refusing to start.", unit_id(u));
return -EAGAIN;
}
s->failure = false;
s->main_pid_known = false;
service_enter_start_pre(s);
return 0;
}
static int service_stop(Unit *u) {
Service *s = SERVICE(u);
assert(s);
if (s->state == SERVICE_START_PRE ||
s->state == SERVICE_START ||
s->state == SERVICE_START_POST ||
s->state == SERVICE_RELOAD)
return -EAGAIN;
if (s->state == SERVICE_AUTO_RESTART) {
service_set_state(s, SERVICE_DEAD);
return 0;
}
assert(s->state == SERVICE_RUNNING);
service_enter_stop(s, true);
return 0;
}
static int service_reload(Unit *u) {
Service *s = SERVICE(u);
assert(s);
assert(s->state == SERVICE_RUNNING);
service_enter_reload(s);
return 0;
}
static bool service_can_reload(Unit *u) {
Service *s = SERVICE(u);
assert(s);
return !!s->exec_command[SERVICE_EXEC_RELOAD];
}
static UnitActiveState service_active_state(Unit *u) {
assert(u);
return state_translation_table[SERVICE(u)->state];
}
static int main_pid_good(Service *s) {
assert(s);
/* Returns 0 if the pid is dead, 1 if it is good, -1 if we
* don't know */
/* If we know the pid file, then lets just check if it is
* still valid */
if (s->main_pid_known)
return s->main_pid > 0;
/* We don't know the pid */
return -1;
}
static bool control_pid_good(Service *s) {
assert(s);
return s->control_pid > 0;
}
static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
Service *s = SERVICE(u);
bool success;
assert(s);
assert(pid >= 0);
success = code == CLD_EXITED && status == 0;
s->failure = s->failure || !success;
if (s->main_pid == pid) {
exec_status_fill(&s->main_exec_status, pid, code, status);
s->main_pid = 0;
if (s->type == SERVICE_SIMPLE || s->type == SERVICE_FINISH) {
assert(s->exec_command[SERVICE_EXEC_START]);
s->exec_command[SERVICE_EXEC_START]->exec_status = s->main_exec_status;
}
log_debug("%s: main process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
/* The service exited, so the service is officially
* gone. */
switch (s->state) {
case SERVICE_START_POST:
case SERVICE_RELOAD:
case SERVICE_STOP:
/* Need to wait until the operation is
* done */
break;
case SERVICE_START:
assert(s->type == SERVICE_FINISH);
/* This was our main goal, so let's go on */
if (success)
service_enter_start_post(s);
else
service_enter_stop(s, false);
break;
case SERVICE_RUNNING:
service_enter_stop(s, success);
break;
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (!control_pid_good(s))
service_enter_stop_post(s, success);
/* If there is still a control process, wait for that first */
break;
default:
assert_not_reached("Uh, main process died at wrong time.");
}
} else if (s->control_pid == pid) {
assert(s->control_command);
exec_status_fill(&s->control_command->exec_status, pid, code, status);
s->control_pid = 0;
log_debug("%s: control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
/* If we are shutting things down anyway we
* don't care about failing commands. */
if (s->control_command->command_next &&
(success || (s->state == SERVICE_EXEC_STOP || s->state == SERVICE_EXEC_STOP_POST)))
/* There is another command to *
* execute, so let's do that. */
service_run_next(s, success);
else {
/* No further commands for this step, so let's
* figure out what to do next */
log_debug("%s got final SIGCHLD for state %s", unit_id(u), service_state_to_string(s->state));
switch (s->state) {
case SERVICE_START_PRE:
if (success)
service_enter_start(s);
else
service_enter_stop(s, false);
break;
case SERVICE_START:
assert(s->type == SERVICE_FORKING);
/* Let's try to load the pid
* file here if we can. We
* ignore the return value,
* since the PID file might
* actually be created by a
* START_POST script */
if (success) {
if (s->pid_file)
service_load_pid_file(s);
service_enter_start_post(s);
} else
service_enter_stop(s, false);
break;
case SERVICE_START_POST:
if (success && s->pid_file && !s->main_pid_known) {
int r;
/* Hmm, let's see if we can
* load the pid now after the
* start-post scripts got
* executed. */
if ((r = service_load_pid_file(s)) < 0)
log_warning("%s: failed to load PID file %s: %s", unit_id(UNIT(s)), s->pid_file, strerror(-r));
}
/* Fall through */
case SERVICE_RELOAD:
if (success) {
if (main_pid_good(s) != 0)
service_set_state(s, SERVICE_RUNNING);
else
service_enter_stop(s, true);
} else
service_enter_stop(s, false);
break;
case SERVICE_STOP:
if (main_pid_good(s) > 0)
/* Still not dead and we know the PID? Let's go hunting. */
service_enter_signal(s, SERVICE_STOP_SIGTERM, success);
else
service_enter_stop_post(s, success);
break;
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (main_pid_good(s) <= 0)
service_enter_stop_post(s, success);
/* If there is still a service
* process around, wait until
* that one quit, too */
break;
case SERVICE_STOP_POST:
case SERVICE_FINAL_SIGTERM:
case SERVICE_FINAL_SIGKILL:
service_enter_dead(s, success, true);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
}
} else
assert_not_reached("Got SIGCHLD for unkown PID");
}
static void service_timer_event(Unit *u, uint64_t elapsed, Watch* w) {
Service *s = SERVICE(u);
assert(s);
assert(elapsed == 1);
assert(w == &s->timer_watch);
switch (s->state) {
case SERVICE_START_PRE:
case SERVICE_START:
case SERVICE_START_POST:
case SERVICE_RELOAD:
log_warning("%s operation timed out. Stopping.", unit_id(u));
service_enter_stop(s, false);
break;
case SERVICE_STOP:
log_warning("%s stopping timed out. Terminating.", unit_id(u));
service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
break;
case SERVICE_STOP_SIGTERM:
log_warning("%s stopping timed out. Killing.", unit_id(u));
service_enter_signal(s, SERVICE_STOP_SIGKILL, false);
break;
case SERVICE_STOP_SIGKILL:
/* Uh, wie sent a SIGKILL and it is still not gone?
* Must be something we cannot kill, so let's just be
* weirded out and continue */
log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
service_enter_stop_post(s, false);
break;
case SERVICE_STOP_POST:
log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_FINAL_SIGTERM:
log_warning("%s stopping timed out (2). Killing.", unit_id(u));
service_enter_signal(s, SERVICE_FINAL_SIGKILL, false);
break;
case SERVICE_FINAL_SIGKILL:
log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
service_enter_dead(s, false, true);
break;
case SERVICE_AUTO_RESTART:
log_debug("%s holdoff time over, scheduling restart.", unit_id(u));
service_enter_restart(s);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
}
static int service_enumerate(Manager *m) {
static const char * const rcnd[] = {
"../rc0.d", SPECIAL_RUNLEVEL0_TARGET,
"../rc1.d", SPECIAL_RUNLEVEL1_TARGET,
"../rc2.d", SPECIAL_RUNLEVEL2_TARGET,
"../rc3.d", SPECIAL_RUNLEVEL3_TARGET,
"../rc4.d", SPECIAL_RUNLEVEL4_TARGET,
"../rc5.d", SPECIAL_RUNLEVEL5_TARGET,
"../rc6.d", SPECIAL_RUNLEVEL6_TARGET
};
char **p;
unsigned i;
DIR *d = NULL;
char *path = NULL, *fpath = NULL, *name = NULL;
int r;
assert(m);
STRV_FOREACH(p, m->sysvinit_path)
for (i = 0; i < ELEMENTSOF(rcnd); i += 2) {
struct dirent *de;
free(path);
path = NULL;
if (asprintf(&path, "%s/%s", *p, rcnd[i]) < 0) {
r = -ENOMEM;
goto finish;
}
if (d)
closedir(d);
if (!(d = opendir(path))) {
if (errno != ENOENT)
log_warning("opendir() failed on %s: %s", path, strerror(errno));
continue;
}
while ((de = readdir(d))) {
Unit *runlevel, *service;
if (ignore_file(de->d_name))
continue;
if (de->d_name[0] != 'S' && de->d_name[0] != 'K')
continue;
if (strlen(de->d_name) < 4)
continue;
free(fpath);
fpath = NULL;
if (asprintf(&fpath, "%s/%s/%s", *p, rcnd[i], de->d_name) < 0) {
r = -ENOMEM;
goto finish;
}
if (access(fpath, X_OK) < 0) {
if (errno != ENOENT)
log_warning("access() failed on %s: %s", fpath, strerror(errno));
continue;
}
free(name);
name = NULL;
if (asprintf(&name, "%s.service", de->d_name+3) < 0) {
r = -ENOMEM;
goto finish;
}
if ((r = manager_load_unit(m, name, &service)) < 0)
goto finish;
if ((r = manager_load_unit(m, rcnd[i+1], &runlevel)) < 0)
goto finish;
if (de->d_name[0] == 'S') {
if ((r = unit_add_dependency(runlevel, UNIT_WANTS, service)) < 0)
goto finish;
if ((r = unit_add_dependency(runlevel, UNIT_AFTER, service)) < 0)
goto finish;
} else {
if ((r = unit_add_dependency(runlevel, UNIT_CONFLICTS, service)) < 0)
goto finish;
if ((r = unit_add_dependency(runlevel, UNIT_BEFORE, service)) < 0)
goto finish;
}
}
}
r = 0;
finish:
free(path);
free(fpath);
free(name);
closedir(d);
return r;
}
static const char* const service_state_table[_SERVICE_STATE_MAX] = {
[SERVICE_DEAD] = "dead",
[SERVICE_START_PRE] = "start-pre",
[SERVICE_START] = "start",
[SERVICE_START_POST] = "start-post",
[SERVICE_RUNNING] = "running",
[SERVICE_RELOAD] = "reload",
[SERVICE_STOP] = "stop",
[SERVICE_STOP_SIGTERM] = "stop-sigterm",
[SERVICE_STOP_SIGKILL] = "stop-sigkill",
[SERVICE_STOP_POST] = "stop-post",
[SERVICE_FINAL_SIGTERM] = "final-sigterm",
[SERVICE_FINAL_SIGKILL] = "final-sigkill",
[SERVICE_MAINTAINANCE] = "maintainance",
[SERVICE_AUTO_RESTART] = "auto-restart",
};
DEFINE_STRING_TABLE_LOOKUP(service_state, ServiceState);
static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
[SERVICE_ONCE] = "once",
[SERVICE_RESTART_ON_SUCCESS] = "restart-on-success",
[SERVICE_RESTART_ALWAYS] = "restart-on-failure",
};
DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
[SERVICE_FORKING] = "forking",
[SERVICE_SIMPLE] = "simple",
[SERVICE_FINISH] = "finish"
};
DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
static const char* const service_exec_command_table[_SERVICE_EXEC_MAX] = {
[SERVICE_EXEC_START_PRE] = "ExecStartPre",
[SERVICE_EXEC_START] = "ExecStart",
[SERVICE_EXEC_START_POST] = "ExecStartPost",
[SERVICE_EXEC_RELOAD] = "ExecReload",
[SERVICE_EXEC_STOP] = "ExecStop",
[SERVICE_EXEC_STOP_POST] = "ExecStopPost",
};
DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
const UnitVTable service_vtable = {
.suffix = ".service",
.init = service_init,
.done = service_done,
.dump = service_dump,
.start = service_start,
.stop = service_stop,
.reload = service_reload,
.can_reload = service_can_reload,
.active_state = service_active_state,
.sigchld_event = service_sigchld_event,
.timer_event = service_timer_event,
.enumerate = service_enumerate
};
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