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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include "async.h"
#include "manager.h"
#include "unit.h"
#include "service.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
#include "strv.h"
#include "unit-name.h"
#include "unit-printf.h"
#include "dbus-service.h"
#include "special.h"
#include "exit-status.h"
#include "def.h"
#include "path-util.h"
#include "util.h"
#include "utf8.h"
#include "env-util.h"
#include "fileio.h"
#include "bus-error.h"
#include "bus-util.h"
#include "bus-kernel.h"
#include "formats-util.h"
#include "process-util.h"
#include "signal-util.h"
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_EXITED] = UNIT_ACTIVE,
[SERVICE_RELOAD] = UNIT_RELOADING,
[SERVICE_STOP] = UNIT_DEACTIVATING,
[SERVICE_STOP_SIGABRT] = 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_FAILED] = UNIT_FAILED,
[SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
};
/* For Type=idle we never want to delay any other jobs, hence we
* consider idle jobs active as soon as we start working on them */
static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = {
[SERVICE_DEAD] = UNIT_INACTIVE,
[SERVICE_START_PRE] = UNIT_ACTIVE,
[SERVICE_START] = UNIT_ACTIVE,
[SERVICE_START_POST] = UNIT_ACTIVE,
[SERVICE_RUNNING] = UNIT_ACTIVE,
[SERVICE_EXITED] = UNIT_ACTIVE,
[SERVICE_RELOAD] = UNIT_RELOADING,
[SERVICE_STOP] = UNIT_DEACTIVATING,
[SERVICE_STOP_SIGABRT] = 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_FAILED] = UNIT_FAILED,
[SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
};
static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata);
static void service_enter_signal(Service *s, ServiceState state, ServiceResult f);
static void service_enter_reload_by_notify(Service *s);
static void service_init(Unit *u) {
Service *s = SERVICE(u);
assert(u);
assert(u->load_state == UNIT_STUB);
s->timeout_start_usec = u->manager->default_timeout_start_usec;
s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
s->restart_usec = u->manager->default_restart_usec;
s->type = _SERVICE_TYPE_INVALID;
s->socket_fd = -1;
s->bus_endpoint_fd = -1;
s->guess_main_pid = true;
RATELIMIT_INIT(s->start_limit, u->manager->default_start_limit_interval, u->manager->default_start_limit_burst);
s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
}
static void service_unwatch_control_pid(Service *s) {
assert(s);
if (s->control_pid <= 0)
return;
unit_unwatch_pid(UNIT(s), s->control_pid);
s->control_pid = 0;
}
static void service_unwatch_main_pid(Service *s) {
assert(s);
if (s->main_pid <= 0)
return;
unit_unwatch_pid(UNIT(s), s->main_pid);
s->main_pid = 0;
}
static void service_unwatch_pid_file(Service *s) {
if (!s->pid_file_pathspec)
return;
log_unit_debug(UNIT(s), "Stopping watch for PID file %s", s->pid_file_pathspec->path);
path_spec_unwatch(s->pid_file_pathspec);
path_spec_done(s->pid_file_pathspec);
free(s->pid_file_pathspec);
s->pid_file_pathspec = NULL;
}
static int service_set_main_pid(Service *s, pid_t pid) {
pid_t ppid;
assert(s);
if (pid <= 1)
return -EINVAL;
if (pid == getpid())
return -EINVAL;
if (s->main_pid == pid && s->main_pid_known)
return 0;
if (s->main_pid != pid) {
service_unwatch_main_pid(s);
exec_status_start(&s->main_exec_status, pid);
}
s->main_pid = pid;
s->main_pid_known = true;
if (get_parent_of_pid(pid, &ppid) >= 0 && ppid != getpid()) {
log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid);
s->main_pid_alien = true;
} else
s->main_pid_alien = false;
return 0;
}
static void service_close_socket_fd(Service *s) {
assert(s);
s->socket_fd = asynchronous_close(s->socket_fd);
}
static void service_connection_unref(Service *s) {
assert(s);
if (!UNIT_ISSET(s->accept_socket))
return;
socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket)));
unit_ref_unset(&s->accept_socket);
}
static void service_stop_watchdog(Service *s) {
assert(s);
s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source);
s->watchdog_timestamp = DUAL_TIMESTAMP_NULL;
}
static void service_start_watchdog(Service *s) {
int r;
assert(s);
if (s->watchdog_usec <= 0)
return;
if (s->watchdog_event_source) {
r = sd_event_source_set_time(s->watchdog_event_source, s->watchdog_timestamp.monotonic + s->watchdog_usec);
if (r < 0) {
log_unit_warning_errno(UNIT(s), r, "Failed to reset watchdog timer: %m");
return;
}
r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT);
} else {
r = sd_event_add_time(
UNIT(s)->manager->event,
&s->watchdog_event_source,
CLOCK_MONOTONIC,
s->watchdog_timestamp.monotonic + s->watchdog_usec, 0,
service_dispatch_watchdog, s);
if (r < 0) {
log_unit_warning_errno(UNIT(s), r, "Failed to add watchdog timer: %m");
return;
}
(void) sd_event_source_set_description(s->watchdog_event_source, "service-watchdog");
/* Let's process everything else which might be a sign
* of living before we consider a service died. */
r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);
}
if (r < 0)
log_unit_warning_errno(UNIT(s), r, "Failed to install watchdog timer: %m");
}
static void service_reset_watchdog(Service *s) {
assert(s);
dual_timestamp_get(&s->watchdog_timestamp);
service_start_watchdog(s);
}
static void service_fd_store_unlink(ServiceFDStore *fs) {
if (!fs)
return;
if (fs->service) {
assert(fs->service->n_fd_store > 0);
LIST_REMOVE(fd_store, fs->service->fd_store, fs);
fs->service->n_fd_store--;
}
if (fs->event_source) {
sd_event_source_set_enabled(fs->event_source, SD_EVENT_OFF);
sd_event_source_unref(fs->event_source);
}
safe_close(fs->fd);
free(fs);
}
static void service_release_resources(Unit *u) {
Service *s = SERVICE(u);
assert(s);
if (!s->fd_store)
return;
log_unit_debug(u, "Releasing all resources.");
while (s->fd_store)
service_fd_store_unlink(s->fd_store);
assert(s->n_fd_store == 0);
}
static void service_done(Unit *u) {
Service *s = SERVICE(u);
assert(s);
free(s->pid_file);
s->pid_file = NULL;
free(s->status_text);
s->status_text = NULL;
free(s->reboot_arg);
s->reboot_arg = NULL;
s->exec_runtime = exec_runtime_unref(s->exec_runtime);
exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
s->control_command = NULL;
s->main_command = NULL;
exit_status_set_free(&s->restart_prevent_status);
exit_status_set_free(&s->restart_force_status);
exit_status_set_free(&s->success_status);
/* This will leak a process, but at least no memory or any of
* our resources */
service_unwatch_main_pid(s);
service_unwatch_control_pid(s);
service_unwatch_pid_file(s);
if (s->bus_name) {
unit_unwatch_bus_name(u, s->bus_name);
free(s->bus_name);
s->bus_name = NULL;
}
s->bus_endpoint_fd = safe_close(s->bus_endpoint_fd);
service_close_socket_fd(s);
service_connection_unref(s);
unit_ref_unset(&s->accept_socket);
service_stop_watchdog(s);
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
service_release_resources(u);
}
static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
ServiceFDStore *fs = userdata;
assert(e);
assert(fs);
/* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */
service_fd_store_unlink(fs);
return 0;
}
static int service_add_fd_store(Service *s, int fd) {
ServiceFDStore *fs;
int r;
assert(s);
assert(fd >= 0);
if (s->n_fd_store >= s->n_fd_store_max)
return 0;
LIST_FOREACH(fd_store, fs, s->fd_store) {
r = same_fd(fs->fd, fd);
if (r < 0)
return r;
if (r > 0) {
/* Already included */
safe_close(fd);
return 1;
}
}
fs = new0(ServiceFDStore, 1);
if (!fs)
return -ENOMEM;
fs->fd = fd;
fs->service = s;
r = sd_event_add_io(UNIT(s)->manager->event, &fs->event_source, fd, 0, on_fd_store_io, fs);
if (r < 0) {
free(fs);
return r;
}
(void) sd_event_source_set_description(fs->event_source, "service-fd-store");
LIST_PREPEND(fd_store, s->fd_store, fs);
s->n_fd_store++;
return 1;
}
static int service_add_fd_store_set(Service *s, FDSet *fds) {
int r;
assert(s);
if (fdset_size(fds) <= 0)
return 0;
while (s->n_fd_store < s->n_fd_store_max) {
_cleanup_close_ int fd = -1;
fd = fdset_steal_first(fds);
if (fd < 0)
break;
r = service_add_fd_store(s, fd);
if (r < 0)
return log_unit_error_errno(UNIT(s), r, "Couldn't add fd to fd store: %m");
if (r > 0) {
log_unit_debug(UNIT(s), "Added fd to fd store.");
fd = -1;
}
}
if (fdset_size(fds) > 0)
log_unit_warning(UNIT(s), "Tried to store more fds than FDStoreMax=%u allows, closing remaining.", s->n_fd_store_max);
return 0;
}
static int service_arm_timer(Service *s, usec_t usec) {
int r;
assert(s);
if (s->timer_event_source) {
r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + usec);
if (r < 0)
return r;
return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
}
r = sd_event_add_time(
UNIT(s)->manager->event,
&s->timer_event_source,
CLOCK_MONOTONIC,
now(CLOCK_MONOTONIC) + usec, 0,
service_dispatch_timer, s);
if (r < 0)
return r;
(void) sd_event_source_set_description(s->timer_event_source, "service-timer");
return 0;
}
static int service_verify(Service *s) {
assert(s);
if (UNIT(s)->load_state != UNIT_LOADED)
return 0;
if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP]) {
log_unit_error(UNIT(s), "Service lacks both ExecStart= and ExecStop= setting. Refusing.");
return -EINVAL;
}
if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) {
log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
return -EINVAL;
}
if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START]) {
log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for RemainAfterExit=yes services. Refusing.");
return -EINVAL;
}
if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) {
log_unit_error(UNIT(s), "Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
return -EINVAL;
}
if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {
log_unit_error(UNIT(s), "Service has Restart= setting other than no, which isn't allowed for Type=oneshot services. Refusing.");
return -EINVAL;
}
if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) {
log_unit_error(UNIT(s), "Service has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing.");
return -EINVAL;
}
if (s->type == SERVICE_DBUS && !s->bus_name) {
log_unit_error(UNIT(s), "Service is of type D-Bus but no D-Bus service name has been specified. Refusing.");
return -EINVAL;
}
if (s->bus_name && s->type != SERVICE_DBUS)
log_unit_warning(UNIT(s), "Service has a D-Bus service name specified, but is not of type dbus. Ignoring.");
if (s->exec_context.pam_name && !(s->kill_context.kill_mode == KILL_CONTROL_GROUP || s->kill_context.kill_mode == KILL_MIXED)) {
log_unit_error(UNIT(s), "Service has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.");
return -EINVAL;
}
return 0;
}
static int service_add_default_dependencies(Service *s) {
int r;
assert(s);
/* Add a number of automatic dependencies useful for the
* majority of services. */
/* First, pull in base system */
r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_BASIC_TARGET, NULL, true);
if (r < 0)
return r;
/* Second, activate normal shutdown */
return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static void service_fix_output(Service *s) {
assert(s);
/* If nothing has been explicitly configured, patch default
* output in. If input is socket/tty we avoid this however,
* since in that case we want output to default to the same
* place as we read input from. */
if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT &&
s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
s->exec_context.std_input == EXEC_INPUT_NULL)
s->exec_context.std_error = UNIT(s)->manager->default_std_error;
if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
s->exec_context.std_input == EXEC_INPUT_NULL)
s->exec_context.std_output = UNIT(s)->manager->default_std_output;
}
static int service_add_extras(Service *s) {
int r;
assert(s);
if (s->type == _SERVICE_TYPE_INVALID) {
/* Figure out a type automatically */
if (s->bus_name)
s->type = SERVICE_DBUS;
else if (s->exec_command[SERVICE_EXEC_START])
s->type = SERVICE_SIMPLE;
else
s->type = SERVICE_ONESHOT;
}
/* Oneshot services have disabled start timeout by default */
if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined)
s->timeout_start_usec = 0;
service_fix_output(s);
r = unit_patch_contexts(UNIT(s));
if (r < 0)
return r;
r = unit_add_exec_dependencies(UNIT(s), &s->exec_context);
if (r < 0)
return r;
r = unit_add_default_slice(UNIT(s), &s->cgroup_context);
if (r < 0)
return r;
if (s->type == SERVICE_NOTIFY && s->notify_access == NOTIFY_NONE)
s->notify_access = NOTIFY_MAIN;
if (s->watchdog_usec > 0 && s->notify_access == NOTIFY_NONE)
s->notify_access = NOTIFY_MAIN;
if (s->bus_name) {
const char *n;
n = strjoina(s->bus_name, ".busname");
r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, n, NULL, true);
if (r < 0)
return r;
r = unit_watch_bus_name(UNIT(s), s->bus_name);
if (r == -EEXIST)
return log_unit_error_errno(UNIT(s), r, "Two services allocated for the same bus name %s, refusing operation.", s->bus_name);
if (r < 0)
return log_unit_error_errno(UNIT(s), r, "Cannot watch bus name %s: %m", s->bus_name);
}
if (UNIT(s)->default_dependencies) {
r = service_add_default_dependencies(s);
if (r < 0)
return r;
}
return 0;
}
static int service_load(Unit *u) {
Service *s = SERVICE(u);
int r;
assert(s);
/* Load a .service file */
r = unit_load_fragment(u);
if (r < 0)
return r;
/* Still nothing found? Then let's give up */
if (u->load_state == UNIT_STUB)
return -ENOENT;
/* This is a new unit? Then let's add in some extras */
if (u->load_state == UNIT_LOADED) {
/* We were able to load something, then let's add in
* the dropin directories. */
r = unit_load_dropin(u);
if (r < 0)
return r;
/* This is a new unit? Then let's add in some
* extras */
r = service_add_extras(s);
if (r < 0)
return r;
}
return service_verify(s);
}
static void service_dump(Unit *u, FILE *f, const char *prefix) {
ServiceExecCommand c;
Service *s = SERVICE(u);
const char *prefix2;
assert(s);
prefix = strempty(prefix);
prefix2 = strjoina(prefix, "\t");
fprintf(f,
"%sService State: %s\n"
"%sResult: %s\n"
"%sReload Result: %s\n"
"%sPermissionsStartOnly: %s\n"
"%sRootDirectoryStartOnly: %s\n"
"%sRemainAfterExit: %s\n"
"%sGuessMainPID: %s\n"
"%sType: %s\n"
"%sRestart: %s\n"
"%sNotifyAccess: %s\n"
"%sNotifyState: %s\n",
prefix, service_state_to_string(s->state),
prefix, service_result_to_string(s->result),
prefix, service_result_to_string(s->reload_result),
prefix, yes_no(s->permissions_start_only),
prefix, yes_no(s->root_directory_start_only),
prefix, yes_no(s->remain_after_exit),
prefix, yes_no(s->guess_main_pid),
prefix, service_type_to_string(s->type),
prefix, service_restart_to_string(s->restart),
prefix, notify_access_to_string(s->notify_access),
prefix, notify_state_to_string(s->notify_state));
if (s->control_pid > 0)
fprintf(f,
"%sControl PID: "PID_FMT"\n",
prefix, s->control_pid);
if (s->main_pid > 0)
fprintf(f,
"%sMain PID: "PID_FMT"\n"
"%sMain PID Known: %s\n"
"%sMain PID Alien: %s\n",
prefix, s->main_pid,
prefix, yes_no(s->main_pid_known),
prefix, yes_no(s->main_pid_alien));
if (s->pid_file)
fprintf(f,
"%sPIDFile: %s\n",
prefix, s->pid_file);
if (s->bus_name)
fprintf(f,
"%sBusName: %s\n"
"%sBus Name Good: %s\n",
prefix, s->bus_name,
prefix, yes_no(s->bus_name_good));
kill_context_dump(&s->kill_context, f, prefix);
exec_context_dump(&s->exec_context, f, prefix);
for (c = 0; c < _SERVICE_EXEC_COMMAND_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->status_text)
fprintf(f, "%sStatus Text: %s\n",
prefix, s->status_text);
if (s->n_fd_store_max > 0) {
fprintf(f,
"%sFile Descriptor Store Max: %u\n"
"%sFile Descriptor Store Current: %u\n",
prefix, s->n_fd_store_max,
prefix, s->n_fd_store);
}
}
static int service_load_pid_file(Service *s, bool may_warn) {
_cleanup_free_ char *k = NULL;
int r;
pid_t pid;
assert(s);
if (!s->pid_file)
return -ENOENT;
r = read_one_line_file(s->pid_file, &k);
if (r < 0) {
if (may_warn)
log_unit_info_errno(UNIT(s), r, "PID file %s not readable (yet?) after %s: %m", s->pid_file, service_state_to_string(s->state));
return r;
}
r = parse_pid(k, &pid);
if (r < 0) {
if (may_warn)
log_unit_info_errno(UNIT(s), r, "Failed to read PID from file %s: %m", s->pid_file);
return r;
}
if (!pid_is_alive(pid)) {
if (may_warn)
log_unit_info(UNIT(s), "PID "PID_FMT" read from file %s does not exist or is a zombie.", pid, s->pid_file);
return -ESRCH;
}
if (s->main_pid_known) {
if (pid == s->main_pid)
return 0;
log_unit_debug(UNIT(s), "Main PID changing: "PID_FMT" -> "PID_FMT, s->main_pid, pid);
service_unwatch_main_pid(s);
s->main_pid_known = false;
} else
log_unit_debug(UNIT(s), "Main PID loaded: "PID_FMT, pid);
r = service_set_main_pid(s, pid);
if (r < 0)
return r;
r = unit_watch_pid(UNIT(s), pid);
if (r < 0) {
/* FIXME: we need to do something here */
log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" for service: %m", pid);
return r;
}
return 0;
}
static int service_search_main_pid(Service *s) {
pid_t pid;
int r;
assert(s);
/* If we know it anyway, don't ever fallback to unreliable
* heuristics */
if (s->main_pid_known)
return 0;
if (!s->guess_main_pid)
return 0;
assert(s->main_pid <= 0);
pid = unit_search_main_pid(UNIT(s));
if (pid <= 0)
return -ENOENT;
log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid);
r = service_set_main_pid(s, pid);
if (r < 0)
return r;
r = unit_watch_pid(UNIT(s), pid);
if (r < 0) {
/* FIXME: we need to do something here */
log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" from: %m", pid);
return r;
}
return 0;
}
static void service_set_state(Service *s, ServiceState state) {
ServiceState old_state;
const UnitActiveState *table;
assert(s);
table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
old_state = s->state;
s->state = state;
service_unwatch_pid_file(s);
if (!IN_SET(state,
SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
SERVICE_RELOAD,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
SERVICE_AUTO_RESTART))
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
if (!IN_SET(state,
SERVICE_START, SERVICE_START_POST,
SERVICE_RUNNING, SERVICE_RELOAD,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
service_unwatch_main_pid(s);
s->main_command = NULL;
}
if (!IN_SET(state,
SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
SERVICE_RELOAD,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
service_unwatch_control_pid(s);
s->control_command = NULL;
s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
}
if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
unit_unwatch_all_pids(UNIT(s));
if (!IN_SET(state,
SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
SERVICE_RUNNING, SERVICE_RELOAD,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) &&
!(state == SERVICE_DEAD && UNIT(s)->job)) {
service_close_socket_fd(s);
service_connection_unref(s);
}
if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
service_stop_watchdog(s);
/* For the inactive states unit_notify() will trim the cgroup,
* but for exit we have to do that ourselves... */
if (state == SERVICE_EXITED && UNIT(s)->manager->n_reloading <= 0)
unit_destroy_cgroup_if_empty(UNIT(s));
/* For remain_after_exit services, let's see if we can "release" the
* hold on the console, since unit_notify() only does that in case of
* change of state */
if (state == SERVICE_EXITED &&
s->remain_after_exit &&
UNIT(s)->manager->n_on_console > 0) {
ExecContext *ec;
ec = unit_get_exec_context(UNIT(s));
if (ec && exec_context_may_touch_console(ec)) {
Manager *m = UNIT(s)->manager;
m->n_on_console --;
if (m->n_on_console == 0)
/* unset no_console_output flag, since the console is free */
m->no_console_output = false;
}
}
if (old_state != state)
log_unit_debug(UNIT(s), "Changed %s -> %s", service_state_to_string(old_state), service_state_to_string(state));
unit_notify(UNIT(s), table[old_state], table[state], s->reload_result == SERVICE_SUCCESS);
s->reload_result = SERVICE_SUCCESS;
}
static int service_coldplug(Unit *u) {
Service *s = SERVICE(u);
int r;
assert(s);
assert(s->state == SERVICE_DEAD);
if (s->deserialized_state != s->state) {
if (IN_SET(s->deserialized_state,
SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
SERVICE_RELOAD,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
usec_t k;
k = IN_SET(s->deserialized_state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD) ? s->timeout_start_usec : s->timeout_stop_usec;
/* For the start/stop timeouts 0 means off */
if (k > 0) {
r = service_arm_timer(s, k);
if (r < 0)
return r;
}
}
if (s->deserialized_state == SERVICE_AUTO_RESTART) {
/* The restart timeouts 0 means immediately */
r = service_arm_timer(s, s->restart_usec);
if (r < 0)
return r;
}
if (pid_is_unwaited(s->main_pid) &&
((s->deserialized_state == SERVICE_START && IN_SET(s->type, SERVICE_FORKING, SERVICE_DBUS, SERVICE_ONESHOT, SERVICE_NOTIFY)) ||
IN_SET(s->deserialized_state,
SERVICE_START, SERVICE_START_POST,
SERVICE_RUNNING, SERVICE_RELOAD,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) {
r = unit_watch_pid(UNIT(s), s->main_pid);
if (r < 0)
return r;
}
if (pid_is_unwaited(s->control_pid) &&
IN_SET(s->deserialized_state,
SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
SERVICE_RELOAD,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
r = unit_watch_pid(UNIT(s), s->control_pid);
if (r < 0)
return r;
}
if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART))
unit_watch_all_pids(UNIT(s));
if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
service_start_watchdog(s);
service_set_state(s, s->deserialized_state);
}
return 0;
}
static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
_cleanup_free_ int *rfds = NULL;
unsigned rn_fds = 0;
Iterator i;
int r;
Unit *u;
assert(s);
assert(fds);
assert(n_fds);
if (s->socket_fd >= 0)
return 0;
SET_FOREACH(u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) {
int *cfds;
unsigned cn_fds;
Socket *sock;
if (u->type != UNIT_SOCKET)
continue;
sock = SOCKET(u);
r = socket_collect_fds(sock, &cfds, &cn_fds);
if (r < 0)
return r;
if (cn_fds <= 0) {
free(cfds);
continue;
}
if (!rfds) {
rfds = cfds;
rn_fds = cn_fds;
} else {
int *t;
t = realloc(rfds, (rn_fds + cn_fds) * sizeof(int));
if (!t) {
free(cfds);
return -ENOMEM;
}
memcpy(t + rn_fds, cfds, cn_fds * sizeof(int));
rfds = t;
rn_fds += cn_fds;
free(cfds);
}
}
if (s->n_fd_store > 0) {
ServiceFDStore *fs;
int *t;
t = realloc(rfds, (rn_fds + s->n_fd_store) * sizeof(int));
if (!t)
return -ENOMEM;
rfds = t;
LIST_FOREACH(fd_store, fs, s->fd_store)
rfds[rn_fds++] = fs->fd;
}
*fds = rfds;
*n_fds = rn_fds;
rfds = NULL;
return 0;
}
static int service_spawn(
Service *s,
ExecCommand *c,
usec_t timeout,
bool pass_fds,
bool apply_permissions,
bool apply_chroot,
bool apply_tty_stdin,
bool is_control,
pid_t *_pid) {
pid_t pid;
int r;
int *fds = NULL;
_cleanup_free_ int *fdsbuf = NULL;
unsigned n_fds = 0, n_env = 0;
_cleanup_free_ char *bus_endpoint_path = NULL;
_cleanup_strv_free_ char
**argv = NULL, **final_env = NULL, **our_env = NULL;
const char *path;
ExecParameters exec_params = {
.apply_permissions = apply_permissions,
.apply_chroot = apply_chroot,
.apply_tty_stdin = apply_tty_stdin,
.bus_endpoint_fd = -1,
.selinux_context_net = s->socket_fd_selinux_context_net
};
assert(s);
assert(c);
assert(_pid);
(void) unit_realize_cgroup(UNIT(s));
if (s->reset_cpu_usage) {
(void) unit_reset_cpu_usage(UNIT(s));
s->reset_cpu_usage = false;
}
r = unit_setup_exec_runtime(UNIT(s));
if (r < 0)
goto fail;
if (pass_fds ||
s->exec_context.std_input == EXEC_INPUT_SOCKET ||
s->exec_context.std_output == EXEC_OUTPUT_SOCKET ||
s->exec_context.std_error == EXEC_OUTPUT_SOCKET) {
if (s->socket_fd >= 0) {
fds = &s->socket_fd;
n_fds = 1;
} else {
r = service_collect_fds(s, &fdsbuf, &n_fds);
if (r < 0)
goto fail;
fds = fdsbuf;
}
}
if (timeout > 0) {
r = service_arm_timer(s, timeout);
if (r < 0)
goto fail;
} else
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
r = unit_full_printf_strv(UNIT(s), c->argv, &argv);
if (r < 0)
goto fail;
our_env = new0(char*, 6);
if (!our_env) {
r = -ENOMEM;
goto fail;
}
if (is_control ? s->notify_access == NOTIFY_ALL : s->notify_access != NOTIFY_NONE)
if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0) {
r = -ENOMEM;
goto fail;
}
if (s->main_pid > 0)
if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0) {
r = -ENOMEM;
goto fail;
}
if (UNIT(s)->manager->running_as != MANAGER_SYSTEM)
if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid()) < 0) {
r = -ENOMEM;
goto fail;
}
if (UNIT_DEREF(s->accept_socket)) {
union sockaddr_union sa;
socklen_t salen = sizeof(sa);
r = getpeername(s->socket_fd, &sa.sa, &salen);
if (r < 0) {
r = -errno;
goto fail;
}
if (IN_SET(sa.sa.sa_family, AF_INET, AF_INET6)) {
_cleanup_free_ char *addr = NULL;
char *t;
int port;
r = sockaddr_pretty(&sa.sa, salen, true, false, &addr);
if (r < 0)
goto fail;
t = strappend("REMOTE_ADDR=", addr);
if (!t) {
r = -ENOMEM;
goto fail;
}
our_env[n_env++] = t;
port = sockaddr_port(&sa.sa);
if (port < 0) {
r = port;
goto fail;
}
if (asprintf(&t, "REMOTE_PORT=%u", port) < 0) {
r = -ENOMEM;
goto fail;
}
our_env[n_env++] = t;
}
}
final_env = strv_env_merge(2, UNIT(s)->manager->environment, our_env, NULL);
if (!final_env) {
r = -ENOMEM;
goto fail;
}
if (is_control && UNIT(s)->cgroup_path) {
path = strjoina(UNIT(s)->cgroup_path, "/control");
cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
} else
path = UNIT(s)->cgroup_path;
if (s->exec_context.bus_endpoint) {
r = bus_kernel_create_endpoint(UNIT(s)->manager->running_as == MANAGER_SYSTEM ? "system" : "user",
UNIT(s)->id, &bus_endpoint_path);
if (r < 0)
goto fail;
/* Pass the fd to the exec_params so that the child process can upload the policy.
* Keep a reference to the fd in the service, so the endpoint is kept alive as long
* as the service is running. */
exec_params.bus_endpoint_fd = s->bus_endpoint_fd = r;
}
exec_params.argv = argv;
exec_params.fds = fds;
exec_params.n_fds = n_fds;
exec_params.environment = final_env;
exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
exec_params.cgroup_path = path;
exec_params.cgroup_delegate = s->cgroup_context.delegate;
exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
exec_params.watchdog_usec = s->watchdog_usec;
exec_params.bus_endpoint_path = bus_endpoint_path;
if (s->type == SERVICE_IDLE)
exec_params.idle_pipe = UNIT(s)->manager->idle_pipe;
r = exec_spawn(UNIT(s),
c,
&s->exec_context,
&exec_params,
s->exec_runtime,
&pid);
if (r < 0)
goto fail;
r = unit_watch_pid(UNIT(s), pid);
if (r < 0)
/* FIXME: we need to do something here */
goto fail;
*_pid = pid;
return 0;
fail:
if (timeout)
s->timer_event_source = sd_event_source_unref(s->timer_event_source);
return r;
}
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 let's just check if it is
* still valid */
if (s->main_pid_known) {
/* If it's an alien child let's check if it is still
* alive ... */
if (s->main_pid_alien && s->main_pid > 0)
return pid_is_alive(s->main_pid);
/* .. otherwise assume we'll get a SIGCHLD for it,
* which we really should wait for to collect exit
* status and code */
return s->main_pid > 0;
}
/* We don't know the pid */
return -EAGAIN;
}
_pure_ static int control_pid_good(Service *s) {
assert(s);
return s->control_pid > 0;
}
static int cgroup_good(Service *s) {
int r;
assert(s);
if (!UNIT(s)->cgroup_path)
return 0;
r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path, true);
if (r < 0)
return r;
return !r;
}
static bool service_shall_restart(Service *s) {
assert(s);
/* Don't restart after manual stops */
if (s->forbid_restart)
return false;
/* Never restart if this is configured as special exception */
if (exit_status_set_test(&s->restart_prevent_status, s->main_exec_status.code, s->main_exec_status.status))
return false;
/* Restart if the exit code/status are configured as restart triggers */
if (exit_status_set_test(&s->restart_force_status, s->main_exec_status.code, s->main_exec_status.status))
return true;
switch (s->restart) {
case SERVICE_RESTART_NO:
return false;
case SERVICE_RESTART_ALWAYS:
return true;
case SERVICE_RESTART_ON_SUCCESS:
return s->result == SERVICE_SUCCESS;
case SERVICE_RESTART_ON_FAILURE:
return s->result != SERVICE_SUCCESS;
case SERVICE_RESTART_ON_ABNORMAL:
return !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE);
case SERVICE_RESTART_ON_WATCHDOG:
return s->result == SERVICE_FAILURE_WATCHDOG;
case SERVICE_RESTART_ON_ABORT:
return IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP);
default:
assert_not_reached("unknown restart setting");
}
}
static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) {
int r;
assert(s);
if (f != SERVICE_SUCCESS)
s->result = f;
service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD);
if (s->result != SERVICE_SUCCESS) {
log_unit_warning(UNIT(s), "Failed with result '%s'.", service_result_to_string(s->result));
failure_action(UNIT(s)->manager, s->failure_action, s->reboot_arg);
}
if (allow_restart && service_shall_restart(s)) {
r = service_arm_timer(s, s->restart_usec);
if (r < 0)
goto fail;
service_set_state(s, SERVICE_AUTO_RESTART);
}
/* The next restart might not be a manual stop, hence reset the flag indicating manual stops */
s->forbid_restart = false;
/* We want fresh tmpdirs in case service is started again immediately */
exec_runtime_destroy(s->exec_runtime);
s->exec_runtime = exec_runtime_unref(s->exec_runtime);
/* Also, remove the runtime directory in */
exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
/* Try to delete the pid file. At this point it will be
* out-of-date, and some software might be confused by it, so
* let's remove it. */
if (s->pid_file)
unlink_noerrno(s->pid_file);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run install restart timer: %m");
service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
}
static void service_enter_stop_post(Service *s, ServiceResult f) {
int r;
assert(s);
if (f != SERVICE_SUCCESS)
s->result = f;
service_unwatch_control_pid(s);
unit_watch_all_pids(UNIT(s));
s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST];
if (s->control_command) {
s->control_command_id = SERVICE_EXEC_STOP_POST;
r = service_spawn(s,
s->control_command,
s->timeout_stop_usec,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
true,
true,
&s->control_pid);
if (r < 0)
goto fail;
service_set_state(s, SERVICE_STOP_POST);
} else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
}
static int state_to_kill_operation(ServiceState state) {
switch (state) {
case SERVICE_STOP_SIGABRT:
return KILL_ABORT;
case SERVICE_STOP_SIGTERM:
case SERVICE_FINAL_SIGTERM:
return KILL_TERMINATE;
case SERVICE_STOP_SIGKILL:
case SERVICE_FINAL_SIGKILL:
return KILL_KILL;
default:
return _KILL_OPERATION_INVALID;
}
}
static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) {
int r;
assert(s);
if (f != SERVICE_SUCCESS)
s->result = f;
unit_watch_all_pids(UNIT(s));
r = unit_kill_context(
UNIT(s),
&s->kill_context,
state_to_kill_operation(state),
s->main_pid,
s->control_pid,
s->main_pid_alien);
if (r < 0)
goto fail;
if (r > 0) {
if (s->timeout_stop_usec > 0) {
r = service_arm_timer(s, s->timeout_stop_usec);
if (r < 0)
goto fail;
}
service_set_state(s, state);
} else if (IN_SET(state, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM) && s->kill_context.send_sigkill)
service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);
else if (IN_SET(state, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
service_enter_stop_post(s, SERVICE_SUCCESS);
else if (state == SERVICE_FINAL_SIGTERM && s->kill_context.send_sigkill)
service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS);
else
service_enter_dead(s, SERVICE_SUCCESS, true);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
if (IN_SET(state, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES);
else
service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
}
static void service_enter_stop_by_notify(Service *s) {
assert(s);
unit_watch_all_pids(UNIT(s));
if (s->timeout_stop_usec > 0)
service_arm_timer(s, s->timeout_stop_usec);
/* The service told us it's stopping, so it's as if we SIGTERM'd it. */
service_set_state(s, SERVICE_STOP_SIGTERM);
}
static void service_enter_stop(Service *s, ServiceResult f) {
int r;
assert(s);
if (f != SERVICE_SUCCESS)
s->result = f;
service_unwatch_control_pid(s);
unit_watch_all_pids(UNIT(s));
s->control_command = s->exec_command[SERVICE_EXEC_STOP];
if (s->control_command) {
s->control_command_id = SERVICE_EXEC_STOP;
r = service_spawn(s,
s->control_command,
s->timeout_stop_usec,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
false,
true,
&s->control_pid);
if (r < 0)
goto fail;
service_set_state(s, SERVICE_STOP);
} else
service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop' task: %m");
service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
}
static void service_enter_running(Service *s, ServiceResult f) {
int main_pid_ok, cgroup_ok;
assert(s);
if (f != SERVICE_SUCCESS)
s->result = f;
main_pid_ok = main_pid_good(s);
cgroup_ok = cgroup_good(s);
if ((main_pid_ok > 0 || (main_pid_ok < 0 && cgroup_ok != 0)) &&
(s->bus_name_good || s->type != SERVICE_DBUS)) {
/* If there are any queued up sd_notify()
* notifications, process them now */
if (s->notify_state == NOTIFY_RELOADING)
service_enter_reload_by_notify(s);
else if (s->notify_state == NOTIFY_STOPPING)
service_enter_stop_by_notify(s);
else
service_set_state(s, SERVICE_RUNNING);
} else if (s->remain_after_exit)
service_set_state(s, SERVICE_EXITED);
else
service_enter_stop(s, SERVICE_SUCCESS);
}
static void service_enter_start_post(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
service_reset_watchdog(s);
s->control_command = s->exec_command[SERVICE_EXEC_START_POST];
if (s->control_command) {
s->control_command_id = SERVICE_EXEC_START_POST;
r = service_spawn(s,
s->control_command,
s->timeout_start_usec,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
false,
true,
&s->control_pid);
if (r < 0)
goto fail;
service_set_state(s, SERVICE_START_POST);
} else
service_enter_running(s, SERVICE_SUCCESS);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
}
static void service_kill_control_processes(Service *s) {
char *p;
if (!UNIT(s)->cgroup_path)
return;
p = strjoina(UNIT(s)->cgroup_path, "/control");
cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, p, SIGKILL, true, true, true, NULL);
}
static void service_enter_start(Service *s) {
ExecCommand *c;
pid_t pid;
int r;
assert(s);
service_unwatch_control_pid(s);
service_unwatch_main_pid(s);
/* We want to ensure that nobody leaks processes from
* START_PRE here, so let's go on a killing spree, People
* should not spawn long running processes from START_PRE. */
service_kill_control_processes(s);
if (s->type == SERVICE_FORKING) {
s->control_command_id = SERVICE_EXEC_START;
c = s->control_command = s->exec_command[SERVICE_EXEC_START];
s->main_command = NULL;
} else {
s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
s->control_command = NULL;
c = s->main_command = s->exec_command[SERVICE_EXEC_START];
}
if (!c) {
assert(s->type == SERVICE_ONESHOT);
service_enter_start_post(s);
return;
}
r = service_spawn(s,
c,
IN_SET(s->type, SERVICE_FORKING, SERVICE_DBUS, SERVICE_NOTIFY, SERVICE_ONESHOT) ? s->timeout_start_usec : 0,
true,
true,
true,
true,
false,
&pid);
if (r < 0)
goto fail;
if (s->type == SERVICE_SIMPLE || s->type == SERVICE_IDLE) {
/* For simple services we immediately start
* the START_POST binaries. */
service_set_main_pid(s, pid);
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;
service_set_state(s, SERVICE_START);
} else if (s->type == SERVICE_ONESHOT ||
s->type == SERVICE_DBUS ||
s->type == SERVICE_NOTIFY) {
/* For oneshot services we wait until the start
* process exited, too, but it is our main process. */
/* For D-Bus services we know the main pid right away,
* but wait for the bus name to appear on the
* bus. Notify services are similar. */
service_set_main_pid(s, pid);
service_set_state(s, SERVICE_START);
} else
assert_not_reached("Unknown service type");
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'start' task: %m");
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
}
static void service_enter_start_pre(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
s->control_command = s->exec_command[SERVICE_EXEC_START_PRE];
if (s->control_command) {
/* Before we start anything, let's clear up what might
* be left from previous runs. */
service_kill_control_processes(s);
s->control_command_id = SERVICE_EXEC_START_PRE;
r = service_spawn(s,
s->control_command,
s->timeout_start_usec,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
true,
true,
&s->control_pid);
if (r < 0)
goto fail;
service_set_state(s, SERVICE_START_PRE);
} else
service_enter_start(s);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
}
static void service_enter_restart(Service *s) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(s);
if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) {
/* Don't restart things if we are going down anyway */
log_unit_info(UNIT(s), "Stop job pending for unit, delaying automatic restart.");
r = service_arm_timer(s, s->restart_usec);
if (r < 0)
goto fail;
return;
}
/* Any units that are bound to this service must also be
* restarted. We use JOB_RESTART (instead of the more obvious
* JOB_START) here so that those dependency jobs will be added
* as well. */
r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_FAIL, false, &error, NULL);
if (r < 0)
goto fail;
/* Note that we stay in the SERVICE_AUTO_RESTART state here,
* it will be canceled as part of the service_stop() call that
* is executed as part of JOB_RESTART. */
log_unit_debug(UNIT(s), "Scheduled restart job.");
return;
fail:
log_unit_warning(UNIT(s), "Failed to schedule restart job: %s", bus_error_message(&error, -r));
service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
}
static void service_enter_reload_by_notify(Service *s) {
assert(s);
if (s->timeout_start_usec > 0)
service_arm_timer(s, s->timeout_start_usec);
service_set_state(s, SERVICE_RELOAD);
}
static void service_enter_reload(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
s->control_command = s->exec_command[SERVICE_EXEC_RELOAD];
if (s->control_command) {
s->control_command_id = SERVICE_EXEC_RELOAD;
r = service_spawn(s,
s->control_command,
s->timeout_start_usec,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
false,
true,
&s->control_pid);
if (r < 0)
goto fail;
service_set_state(s, SERVICE_RELOAD);
} else
service_enter_running(s, SERVICE_SUCCESS);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run 'reload' task: %m");
s->reload_result = SERVICE_FAILURE_RESOURCES;
service_enter_running(s, SERVICE_SUCCESS);
}
static void service_run_next_control(Service *s) {
int r;
assert(s);
assert(s->control_command);
assert(s->control_command->command_next);
assert(s->control_command_id != SERVICE_EXEC_START);
s->control_command = s->control_command->command_next;
service_unwatch_control_pid(s);
r = service_spawn(s,
s->control_command,
IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD) ? s->timeout_start_usec : s->timeout_stop_usec,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
s->control_command_id == SERVICE_EXEC_START_PRE ||
s->control_command_id == SERVICE_EXEC_STOP_POST,
true,
&s->control_pid);
if (r < 0)
goto fail;
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run next control task: %m");
if (s->state == SERVICE_START_PRE)
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
else if (s->state == SERVICE_STOP)
service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
else if (s->state == SERVICE_STOP_POST)
service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
else if (s->state == SERVICE_RELOAD) {
s->reload_result = SERVICE_FAILURE_RESOURCES;
service_enter_running(s, SERVICE_SUCCESS);
} else
service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
}
static void service_run_next_main(Service *s) {
pid_t pid;
int r;
assert(s);
assert(s->main_command);
assert(s->main_command->command_next);
assert(s->type == SERVICE_ONESHOT);
s->main_command = s->main_command->command_next;
service_unwatch_main_pid(s);
r = service_spawn(s,
s->main_command,
s->timeout_start_usec,
true,
true,
true,
true,
false,
&pid);
if (r < 0)
goto fail;
service_set_main_pid(s, pid);
return;
fail:
log_unit_warning_errno(UNIT(s), r, "Failed to run next main task: %m");
service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
}
static int service_start_limit_test(Service *s) {
assert(s);
if (ratelimit_test(&s->start_limit))
return 0;
log_unit_warning(UNIT(s), "Start request repeated too quickly.");
return failure_action(UNIT(s)->manager, s->start_limit_action, s->reboot_arg);
}
static int service_start(Unit *u) {
Service *s = SERVICE(u);
int r;
assert(s);
/* We cannot fulfill this request right now, try again later
* please! */
if (IN_SET(s->state,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
return -EAGAIN;
/* Already on it! */
if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST))
return 0;
/* A service that will be restarted must be stopped first to
* trigger BindsTo and/or OnFailure dependencies. If a user
* does not want to wait for the holdoff time to elapse, the
* service should be manually restarted, not started. We
* simply return EAGAIN here, so that any start jobs stay
* queued, and assume that the auto restart timer will
* eventually trigger the restart. */
if (s->state == SERVICE_AUTO_RESTART)
return -EAGAIN;
assert(IN_SET(s->state, SERVICE_DEAD, SERVICE_FAILED));
/* Make sure we don't enter a busy loop of some kind. */
r = service_start_limit_test(s);
if (r < 0) {
service_enter_dead(s, SERVICE_FAILURE_START_LIMIT, false);
return r;
}
s->result = SERVICE_SUCCESS;
s->reload_result = SERVICE_SUCCESS;
s->main_pid_known = false;
s->main_pid_alien = false;
s->forbid_restart = false;
s->reset_cpu_usage = true;
free(s->status_text);
s->status_text = NULL;
s->status_errno = 0;
s->notify_state = NOTIFY_UNKNOWN;
service_enter_start_pre(s);
return 1;
}
static int service_stop(Unit *u) {
Service *s = SERVICE(u);
assert(s);
/* Don't create restart jobs from manual stops. */
s->forbid_restart = true;
/* Already on it */
if (IN_SET(s->state,
SERVICE_STOP, SERVICE_STOP_SIGABRT, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
return 0;
/* A restart will be scheduled or is in progress. */
if (s->state == SERVICE_AUTO_RESTART) {
service_set_state(s, SERVICE_DEAD);
return 0;
}
/* If there's already something running we go directly into
* kill mode. */
if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD)) {
service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
return 0;
}
assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
service_enter_stop(s, SERVICE_SUCCESS);
return 1;
}
static int service_reload(Unit *u) {
Service *s = SERVICE(u);
assert(s);
assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
service_enter_reload(s);
return 1;
}
_pure_ static bool service_can_reload(Unit *u) {
Service *s = SERVICE(u);
assert(s);
return !!s->exec_command[SERVICE_EXEC_RELOAD];
}
static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
Service *s = SERVICE(u);
ServiceFDStore *fs;
assert(u);
assert(f);
assert(fds);
unit_serialize_item(u, f, "state", service_state_to_string(s->state));
unit_serialize_item(u, f, "result", service_result_to_string(s->result));
unit_serialize_item(u, f, "reload-result", service_result_to_string(s->reload_result));
if (s->control_pid > 0)
unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
if (s->main_pid_known && s->main_pid > 0)
unit_serialize_item_format(u, f, "main-pid", PID_FMT, s->main_pid);
unit_serialize_item(u, f, "main-pid-known", yes_no(s->main_pid_known));
unit_serialize_item(u, f, "bus-name-good", yes_no(s->bus_name_good));
if (s->status_text) {
_cleanup_free_ char *c = NULL;
c = cescape(s->status_text);
unit_serialize_item(u, f, "status-text", strempty(c));
}
/* FIXME: There's a minor uncleanliness here: if there are
* multiple commands attached here, we will start from the
* first one again */
if (s->control_command_id >= 0)
unit_serialize_item(u, f, "control-command", service_exec_command_to_string(s->control_command_id));
if (s->socket_fd >= 0) {
int copy;
copy = fdset_put_dup(fds, s->socket_fd);
if (copy < 0)
return copy;
unit_serialize_item_format(u, f, "socket-fd", "%i", copy);
}
if (s->bus_endpoint_fd >= 0) {
int copy;
copy = fdset_put_dup(fds, s->bus_endpoint_fd);
if (copy < 0)
return copy;
unit_serialize_item_format(u, f, "endpoint-fd", "%i", copy);
}
LIST_FOREACH(fd_store, fs, s->fd_store) {
int copy;
copy = fdset_put_dup(fds, fs->fd);
if (copy < 0)
return copy;
unit_serialize_item_format(u, f, "fd-store-fd", "%i", copy);
}
if (s->main_exec_status.pid > 0) {
unit_serialize_item_format(u, f, "main-exec-status-pid", PID_FMT, s->main_exec_status.pid);
dual_timestamp_serialize(f, "main-exec-status-start", &s->main_exec_status.start_timestamp);
dual_timestamp_serialize(f, "main-exec-status-exit", &s->main_exec_status.exit_timestamp);
if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
unit_serialize_item_format(u, f, "main-exec-status-code", "%i", s->main_exec_status.code);
unit_serialize_item_format(u, f, "main-exec-status-status", "%i", s->main_exec_status.status);
}
}
if (dual_timestamp_is_set(&s->watchdog_timestamp))
dual_timestamp_serialize(f, "watchdog-timestamp", &s->watchdog_timestamp);
if (s->forbid_restart)
unit_serialize_item(u, f, "forbid-restart", yes_no(s->forbid_restart));
return 0;
}
static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
Service *s = SERVICE(u);
int r;
assert(u);
assert(key);
assert(value);
assert(fds);
if (streq(key, "state")) {
ServiceState state;
state = service_state_from_string(value);
if (state < 0)
log_unit_debug(u, "Failed to parse state value: %s", value);
else
s->deserialized_state = state;
} else if (streq(key, "result")) {
ServiceResult f;
f = service_result_from_string(value);
if (f < 0)
log_unit_debug(u, "Failed to parse result value: %s", value);
else if (f != SERVICE_SUCCESS)
s->result = f;
} else if (streq(key, "reload-result")) {
ServiceResult f;
f = service_result_from_string(value);
if (f < 0)
log_unit_debug(u, "Failed to parse reload result value: %s", value);
else if (f != SERVICE_SUCCESS)
s->reload_result = f;
} else if (streq(key, "control-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_unit_debug(u, "Failed to parse control-pid value: %s", value);
else
s->control_pid = pid;
} else if (streq(key, "main-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_unit_debug(u, "Failed to parse main-pid value: %s", value);
else {
service_set_main_pid(s, pid);
unit_watch_pid(UNIT(s), pid);
}
} else if (streq(key, "main-pid-known")) {
int b;
b = parse_boolean(value);
if (b < 0)
log_unit_debug(u, "Failed to parse main-pid-known value: %s", value);
else
s->main_pid_known = b;
} else if (streq(key, "bus-name-good")) {
int b;
b = parse_boolean(value);
if (b < 0)
log_unit_debug(u, "Failed to parse bus-name-good value: %s", value);
else
s->bus_name_good = b;
} else if (streq(key, "status-text")) {
char *t;
r = cunescape(value, 0, &t);
if (r < 0)
log_unit_debug_errno(u, r, "Failed to unescape status text: %s", value);
else {
free(s->status_text);
s->status_text = t;
}
} else if (streq(key, "control-command")) {
ServiceExecCommand id;
id = service_exec_command_from_string(value);
if (id < 0)
log_unit_debug(u, "Failed to parse exec-command value: %s", value);
else {
s->control_command_id = id;
s->control_command = s->exec_command[id];
}
} else if (streq(key, "socket-fd")) {
int fd;
if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
log_unit_debug(u, "Failed to parse socket-fd value: %s", value);
else {
asynchronous_close(s->socket_fd);
s->socket_fd = fdset_remove(fds, fd);
}
} else if (streq(key, "endpoint-fd")) {
int fd;
if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
log_unit_debug(u, "Failed to parse endpoint-fd value: %s", value);
else {
safe_close(s->bus_endpoint_fd);
s->bus_endpoint_fd = fdset_remove(fds, fd);
}
} else if (streq(key, "fd-store-fd")) {
int fd;
if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
log_unit_debug(u, "Failed to parse fd-store-fd value: %s", value);
else {
r = service_add_fd_store(s, fd);
if (r < 0)
log_unit_error_errno(u, r, "Failed to add fd to store: %m");
else if (r > 0)
fdset_remove(fds, fd);
}
} else if (streq(key, "main-exec-status-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_unit_debug(u, "Failed to parse main-exec-status-pid value: %s", value);
else
s->main_exec_status.pid = pid;
} else if (streq(key, "main-exec-status-code")) {
int i;
if (safe_atoi(value, &i) < 0)
log_unit_debug(u, "Failed to parse main-exec-status-code value: %s", value);
else
s->main_exec_status.code = i;
} else if (streq(key, "main-exec-status-status")) {
int i;
if (safe_atoi(value, &i) < 0)
log_unit_debug(u, "Failed to parse main-exec-status-status value: %s", value);
else
s->main_exec_status.status = i;
} else if (streq(key, "main-exec-status-start"))
dual_timestamp_deserialize(value, &s->main_exec_status.start_timestamp);
else if (streq(key, "main-exec-status-exit"))
dual_timestamp_deserialize(value, &s->main_exec_status.exit_timestamp);
else if (streq(key, "watchdog-timestamp"))
dual_timestamp_deserialize(value, &s->watchdog_timestamp);
else if (streq(key, "forbid-restart")) {
int b;
b = parse_boolean(value);
if (b < 0)
log_unit_debug(u, "Failed to parse forbid-restart value: %s", value);
else
s->forbid_restart = b;
} else
log_unit_debug(u, "Unknown serialization key: %s", key);
return 0;
}
_pure_ static UnitActiveState service_active_state(Unit *u) {
const UnitActiveState *table;
assert(u);
table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
return table[SERVICE(u)->state];
}
static const char *service_sub_state_to_string(Unit *u) {
assert(u);
return service_state_to_string(SERVICE(u)->state);
}
static bool service_check_gc(Unit *u) {
Service *s = SERVICE(u);
assert(s);
/* Never clean up services that still have a process around,
* even if the service is formally dead. */
if (cgroup_good(s) > 0 ||
main_pid_good(s) > 0 ||
control_pid_good(s) > 0)
return true;
return false;
}
_pure_ static bool service_check_snapshot(Unit *u) {
Service *s = SERVICE(u);
assert(s);
return s->socket_fd < 0;
}
static int service_retry_pid_file(Service *s) {
int r;
assert(s->pid_file);
assert(s->state == SERVICE_START || s->state == SERVICE_START_POST);
r = service_load_pid_file(s, false);
if (r < 0)
return r;
service_unwatch_pid_file(s);
service_enter_running(s, SERVICE_SUCCESS);
return 0;
}
static int service_watch_pid_file(Service *s) {
int r;
log_unit_debug(UNIT(s), "Setting watch for PID file %s", s->pid_file_pathspec->path);
r = path_spec_watch(s->pid_file_pathspec, service_dispatch_io);
if (r < 0)
goto fail;
/* the pidfile might have appeared just before we set the watch */
log_unit_debug(UNIT(s), "Trying to read PID file %s in case it changed", s->pid_file_pathspec->path);
service_retry_pid_file(s);
return 0;
fail:
log_unit_error_errno(UNIT(s), r, "Failed to set a watch for PID file %s: %m", s->pid_file_pathspec->path);
service_unwatch_pid_file(s);
return r;
}
static int service_demand_pid_file(Service *s) {
PathSpec *ps;
assert(s->pid_file);
assert(!s->pid_file_pathspec);
ps = new0(PathSpec, 1);
if (!ps)
return -ENOMEM;
ps->unit = UNIT(s);
ps->path = strdup(s->pid_file);
if (!ps->path) {
free(ps);
return -ENOMEM;
}
path_kill_slashes(ps->path);
/* PATH_CHANGED would not be enough. There are daemons (sendmail) that
* keep their PID file open all the time. */
ps->type = PATH_MODIFIED;
ps->inotify_fd = -1;
s->pid_file_pathspec = ps;
return service_watch_pid_file(s);
}
static int service_dispatch_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
PathSpec *p = userdata;
Service *s;
assert(p);
s = SERVICE(p->unit);
assert(s);
assert(fd >= 0);
assert(s->state == SERVICE_START || s->state == SERVICE_START_POST);
assert(s->pid_file_pathspec);
assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd));
log_unit_debug(UNIT(s), "inotify event");
if (path_spec_fd_event(p, events) < 0)
goto fail;
if (service_retry_pid_file(s) == 0)
return 0;
if (service_watch_pid_file(s) < 0)
goto fail;
return 0;
fail:
service_unwatch_pid_file(s);
service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
return 0;
}
static void service_notify_cgroup_empty_event(Unit *u) {
Service *s = SERVICE(u);
assert(u);
log_unit_debug(u, "cgroup is empty");
switch (s->state) {
/* Waiting for SIGCHLD is usually more interesting,
* because it includes return codes/signals. Which is
* why we ignore the cgroup events for most cases,
* except when we don't know pid which to expect the
* SIGCHLD for. */
case SERVICE_START:
case SERVICE_START_POST:
/* If we were hoping for the daemon to write its PID file,
* we can give up now. */
if (s->pid_file_pathspec) {
log_unit_warning(u, "Daemon never wrote its PID file. Failing.");
service_unwatch_pid_file(s);
if (s->state == SERVICE_START)
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
else
service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
}
break;
case SERVICE_RUNNING:
/* service_enter_running() will figure out what to do */
service_enter_running(s, SERVICE_SUCCESS);
break;
case SERVICE_STOP_SIGABRT:
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (main_pid_good(s) <= 0 && !control_pid_good(s))
service_enter_stop_post(s, SERVICE_SUCCESS);
break;
case SERVICE_STOP_POST:
case SERVICE_FINAL_SIGTERM:
case SERVICE_FINAL_SIGKILL:
if (main_pid_good(s) <= 0 && !control_pid_good(s))
service_enter_dead(s, SERVICE_SUCCESS, true);
break;
default:
;
}
}
static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
Service *s = SERVICE(u);
ServiceResult f;
assert(s);
assert(pid >= 0);
if (UNIT(s)->fragment_path ? is_clean_exit(code, status, &s->success_status) :
is_clean_exit_lsb(code, status, &s->success_status))
f = SERVICE_SUCCESS;
else if (code == CLD_EXITED)
f = SERVICE_FAILURE_EXIT_CODE;
else if (code == CLD_KILLED)
f = SERVICE_FAILURE_SIGNAL;
else if (code == CLD_DUMPED)
f = SERVICE_FAILURE_CORE_DUMP;
else
assert_not_reached("Unknown code");
if (s->main_pid == pid) {
/* Forking services may occasionally move to a new PID.
* As long as they update the PID file before exiting the old
* PID, they're fine. */
if (service_load_pid_file(s, false) == 0)
return;
s->main_pid = 0;
exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status);
if (s->main_command) {
/* If this is not a forking service than the
* main process got started and hence we copy
* the exit status so that it is recorded both
* as main and as control process exit
* status */
s->main_command->exec_status = s->main_exec_status;
if (s->main_command->ignore)
f = SERVICE_SUCCESS;
} else if (s->exec_command[SERVICE_EXEC_START]) {
/* If this is a forked process, then we should
* ignore the return value if this was
* configured for the starter process */
if (s->exec_command[SERVICE_EXEC_START]->ignore)
f = SERVICE_SUCCESS;
}
log_struct(f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
LOG_UNIT_ID(u),
LOG_UNIT_MESSAGE(u, "Main process exited, code=%s, status=%i/%s",
sigchld_code_to_string(code), status,
strna(code == CLD_EXITED
? exit_status_to_string(status, EXIT_STATUS_FULL)
: signal_to_string(status))),
"EXIT_CODE=%s", sigchld_code_to_string(code),
"EXIT_STATUS=%i", status,
NULL);
if (f != SERVICE_SUCCESS)
s->result = f;
if (s->main_command &&
s->main_command->command_next &&
f == SERVICE_SUCCESS) {
/* There is another command to *
* execute, so let's do that. */
log_unit_debug(u, "Running next main command for state %s.", service_state_to_string(s->state));
service_run_next_main(s);
} else {
/* The service exited, so the service is officially
* gone. */
s->main_command = NULL;
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:
if (s->type == SERVICE_ONESHOT) {
/* This was our main goal, so let's go on */
if (f == SERVICE_SUCCESS)
service_enter_start_post(s);
else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
break;
}
/* Fall through */
case SERVICE_RUNNING:
service_enter_running(s, f);
break;
case SERVICE_STOP_SIGABRT:
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (!control_pid_good(s))
service_enter_stop_post(s, f);
/* If there is still a control process, wait for that first */
break;
case SERVICE_STOP_POST:
case SERVICE_FINAL_SIGTERM:
case SERVICE_FINAL_SIGKILL:
if (!control_pid_good(s))
service_enter_dead(s, f, true);
break;
default:
assert_not_reached("Uh, main process died at wrong time.");
}
}
} else if (s->control_pid == pid) {
s->control_pid = 0;
if (s->control_command) {
exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
if (s->control_command->ignore)
f = SERVICE_SUCCESS;
}
log_unit_full(u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
"Control process exited, code=%s status=%i",
sigchld_code_to_string(code), status);
if (f != SERVICE_SUCCESS)
s->result = f;
/* Immediately get rid of the cgroup, so that the
* kernel doesn't delay the cgroup empty messages for
* the service cgroup any longer than necessary */
service_kill_control_processes(s);
if (s->control_command &&
s->control_command->command_next &&
f == SERVICE_SUCCESS) {
/* There is another command to *
* execute, so let's do that. */
log_unit_debug(u, "Running next control command for state %s.", service_state_to_string(s->state));
service_run_next_control(s);
} else {
/* No further commands for this step, so let's
* figure out what to do next */
s->control_command = NULL;
s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
log_unit_debug(u, "Got final SIGCHLD for state %s.", service_state_to_string(s->state));
switch (s->state) {
case SERVICE_START_PRE:
if (f == SERVICE_SUCCESS)
service_enter_start(s);
else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
break;
case SERVICE_START:
if (s->type != SERVICE_FORKING)
/* Maybe spurious event due to a reload that changed the type? */
break;
if (f != SERVICE_SUCCESS) {
service_enter_signal(s, SERVICE_FINAL_SIGTERM, f);
break;
}
if (s->pid_file) {
bool has_start_post;
int r;
/* Let's try to load the pid file here if we can.
* The PID file might actually be created by a START_POST
* script. In that case don't worry if the loading fails. */
has_start_post = !!s->exec_command[SERVICE_EXEC_START_POST];
r = service_load_pid_file(s, !has_start_post);
if (!has_start_post && r < 0) {
r = service_demand_pid_file(s);
if (r < 0 || !cgroup_good(s))
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
break;
}
} else
service_search_main_pid(s);
service_enter_start_post(s);
break;
case SERVICE_START_POST:
if (f != SERVICE_SUCCESS) {
service_enter_stop(s, f);
break;
}
if (s->pid_file) {
int r;
r = service_load_pid_file(s, true);
if (r < 0) {
r = service_demand_pid_file(s);
if (r < 0 || !cgroup_good(s))
service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
break;
}
} else
service_search_main_pid(s);
service_enter_running(s, SERVICE_SUCCESS);
break;
case SERVICE_RELOAD:
if (f == SERVICE_SUCCESS) {
service_load_pid_file(s, true);
service_search_main_pid(s);
}
s->reload_result = f;
service_enter_running(s, SERVICE_SUCCESS);
break;
case SERVICE_STOP:
service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
break;
case SERVICE_STOP_SIGABRT:
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (main_pid_good(s) <= 0)
service_enter_stop_post(s, f);
/* 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:
if (main_pid_good(s) <= 0)
service_enter_dead(s, f, true);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
}
}
/* Notify clients about changed exit status */
unit_add_to_dbus_queue(u);
/* We got one SIGCHLD for the service, let's watch all
* processes that are now running of the service, and watch
* that. Among the PIDs we then watch will be children
* reassigned to us, which hopefully allows us to identify
* when all children are gone */
unit_tidy_watch_pids(u, s->main_pid, s->control_pid);
unit_watch_all_pids(u);
/* If the PID set is empty now, then let's finish this off */
if (set_isempty(u->pids))
service_notify_cgroup_empty_event(u);
}
static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
Service *s = SERVICE(userdata);
assert(s);
assert(source == s->timer_event_source);
switch (s->state) {
case SERVICE_START_PRE:
case SERVICE_START:
log_unit_warning(UNIT(s), "%s operation timed out. Terminating.", s->state == SERVICE_START ? "Start" : "Start-pre");
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT);
break;
case SERVICE_START_POST:
log_unit_warning(UNIT(s), "Start-post operation timed out. Stopping.");
service_enter_stop(s, SERVICE_FAILURE_TIMEOUT);
break;
case SERVICE_RELOAD:
log_unit_warning(UNIT(s), "Reload operation timed out. Stopping.");
s->reload_result = SERVICE_FAILURE_TIMEOUT;
service_enter_running(s, SERVICE_SUCCESS);
break;
case SERVICE_STOP:
log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
break;
case SERVICE_STOP_SIGABRT:
log_unit_warning(UNIT(s), "State 'stop-sigabrt' timed out. Terminating.");
service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
break;
case SERVICE_STOP_SIGTERM:
if (s->kill_context.send_sigkill) {
log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Killing.");
service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT);
} else {
log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Skipping SIGKILL.");
service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
}
break;
case SERVICE_STOP_SIGKILL:
/* Uh, we 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_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
break;
case SERVICE_STOP_POST:
log_unit_warning(UNIT(s), "State 'stop-post' timed out. Terminating.");
service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT);
break;
case SERVICE_FINAL_SIGTERM:
if (s->kill_context.send_sigkill) {
log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Killing.");
service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT);
} else {
log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Skipping SIGKILL. Entering failed mode.");
service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false);
}
break;
case SERVICE_FINAL_SIGKILL:
log_unit_warning(UNIT(s), "Processes still around after final SIGKILL. Entering failed mode.");
service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true);
break;
case SERVICE_AUTO_RESTART:
log_unit_info(UNIT(s),
s->restart_usec > 0 ?
"Service hold-off time over, scheduling restart." :
"Service has no hold-off time, scheduling restart.");
service_enter_restart(s);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
return 0;
}
static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata) {
Service *s = SERVICE(userdata);
char t[FORMAT_TIMESPAN_MAX];
assert(s);
assert(source == s->watchdog_event_source);
log_unit_error(UNIT(s), "Watchdog timeout (limit %s)!",
format_timespan(t, sizeof(t), s->watchdog_usec, 1));
service_enter_signal(s, SERVICE_STOP_SIGABRT, SERVICE_FAILURE_WATCHDOG);
return 0;
}
static void service_notify_message(Unit *u, pid_t pid, char **tags, FDSet *fds) {
Service *s = SERVICE(u);
_cleanup_free_ char *cc = NULL;
bool notify_dbus = false;
const char *e;
assert(u);
cc = strv_join(tags, ", ");
if (s->notify_access == NOTIFY_NONE) {
log_unit_warning(u, "Got notification message from PID "PID_FMT", but reception is disabled.", pid);
return;
} else if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) {
if (s->main_pid != 0)
log_unit_warning(u, "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid);
else
log_unit_debug(u, "Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", pid);
return;
} else
log_unit_debug(u, "Got notification message from PID "PID_FMT" (%s)", pid, isempty(cc) ? "n/a" : cc);
/* Interpret MAINPID= */
e = strv_find_startswith(tags, "MAINPID=");
if (e && IN_SET(s->state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) {
if (parse_pid(e, &pid) < 0)
log_unit_warning(u, "Failed to parse MAINPID= field in notification message: %s", e);
else {
service_set_main_pid(s, pid);
unit_watch_pid(UNIT(s), pid);
notify_dbus = true;
}
}
/* Interpret RELOADING= */
if (strv_find(tags, "RELOADING=1")) {
s->notify_state = NOTIFY_RELOADING;
if (s->state == SERVICE_RUNNING)
service_enter_reload_by_notify(s);
notify_dbus = true;
}
/* Interpret READY= */
if (strv_find(tags, "READY=1")) {
s->notify_state = NOTIFY_READY;
/* Type=notify services inform us about completed
* initialization with READY=1 */
if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START)
service_enter_start_post(s);
/* Sending READY=1 while we are reloading informs us
* that the reloading is complete */
if (s->state == SERVICE_RELOAD && s->control_pid == 0)
service_enter_running(s, SERVICE_SUCCESS);
notify_dbus = true;
}
/* Interpret STOPPING= */
if (strv_find(tags, "STOPPING=1")) {
s->notify_state = NOTIFY_STOPPING;
if (s->state == SERVICE_RUNNING)
service_enter_stop_by_notify(s);
notify_dbus = true;
}
/* Interpret STATUS= */
e = strv_find_startswith(tags, "STATUS=");
if (e) {
_cleanup_free_ char *t = NULL;
if (!isempty(e)) {
if (!utf8_is_valid(e))
log_unit_warning(u, "Status message in notification message is not UTF-8 clean.");
else {
t = strdup(e);
if (!t)
log_oom();
}
}
if (!streq_ptr(s->status_text, t)) {
free(s->status_text);
s->status_text = t;
t = NULL;
notify_dbus = true;
}
}
/* Interpret ERRNO= */
e = strv_find_startswith(tags, "ERRNO=");
if (e) {
int status_errno;
if (safe_atoi(e, &status_errno) < 0 || status_errno < 0)
log_unit_warning(u, "Failed to parse ERRNO= field in notification message: %s", e);
else {
if (s->status_errno != status_errno) {
s->status_errno = status_errno;
notify_dbus = true;
}
}
}
/* Interpret WATCHDOG= */
if (strv_find(tags, "WATCHDOG=1")) {
service_reset_watchdog(s);
}
/* Add the passed fds to the fd store */
if (strv_find(tags, "FDSTORE=1")) {
service_add_fd_store_set(s, fds);
}
/* Notify clients about changed status or main pid */
if (notify_dbus)
unit_add_to_dbus_queue(u);
}
static int service_get_timeout(Unit *u, uint64_t *timeout) {
Service *s = SERVICE(u);
int r;
if (!s->timer_event_source)
return 0;
r = sd_event_source_get_time(s->timer_event_source, timeout);
if (r < 0)
return r;
return 1;
}
static void service_bus_name_owner_change(
Unit *u,
const char *name,
const char *old_owner,
const char *new_owner) {
Service *s = SERVICE(u);
int r;
assert(s);
assert(name);
assert(streq(s->bus_name, name));
assert(old_owner || new_owner);
if (old_owner && new_owner)
log_unit_debug(u, "D-Bus name %s changed owner from %s to %s", name, old_owner, new_owner);
else if (old_owner)
log_unit_debug(u, "D-Bus name %s no longer registered by %s", name, old_owner);
else
log_unit_debug(u, "D-Bus name %s now registered by %s", name, new_owner);
s->bus_name_good = !!new_owner;
if (s->type == SERVICE_DBUS) {
/* service_enter_running() will figure out what to
* do */
if (s->state == SERVICE_RUNNING)
service_enter_running(s, SERVICE_SUCCESS);
else if (s->state == SERVICE_START && new_owner)
service_enter_start_post(s);
} else if (new_owner &&
s->main_pid <= 0 &&
(s->state == SERVICE_START ||
s->state == SERVICE_START_POST ||
s->state == SERVICE_RUNNING ||
s->state == SERVICE_RELOAD)) {
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
pid_t pid;
/* Try to acquire PID from bus service */
r = sd_bus_get_name_creds(u->manager->api_bus, name, SD_BUS_CREDS_PID, &creds);
if (r >= 0)
r = sd_bus_creds_get_pid(creds, &pid);
if (r >= 0) {
log_unit_debug(u, "D-Bus name %s is now owned by process %u", name, (unsigned) pid);
service_set_main_pid(s, pid);
unit_watch_pid(UNIT(s), pid);
}
}
}
int service_set_socket_fd(Service *s, int fd, Socket *sock, bool selinux_context_net) {
_cleanup_free_ char *peer = NULL;
int r;
assert(s);
assert(fd >= 0);
/* This is called by the socket code when instantiating a new
* service for a stream socket and the socket needs to be
* configured. */
if (UNIT(s)->load_state != UNIT_LOADED)
return -EINVAL;
if (s->socket_fd >= 0)
return -EBUSY;
if (s->state != SERVICE_DEAD)
return -EAGAIN;
if (getpeername_pretty(fd, &peer) >= 0) {
if (UNIT(s)->description) {
_cleanup_free_ char *a;
a = strjoin(UNIT(s)->description, " (", peer, ")", NULL);
if (!a)
return -ENOMEM;
r = unit_set_description(UNIT(s), a);
} else
r = unit_set_description(UNIT(s), peer);
if (r < 0)
return r;
}
s->socket_fd = fd;
s->socket_fd_selinux_context_net = selinux_context_net;
unit_ref_set(&s->accept_socket, UNIT(sock));
return unit_add_two_dependencies(UNIT(sock), UNIT_BEFORE, UNIT_TRIGGERS, UNIT(s), false);
}
static void service_reset_failed(Unit *u) {
Service *s = SERVICE(u);
assert(s);
if (s->state == SERVICE_FAILED)
service_set_state(s, SERVICE_DEAD);
s->result = SERVICE_SUCCESS;
s->reload_result = SERVICE_SUCCESS;
RATELIMIT_RESET(s->start_limit);
}
static int service_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
Service *s = SERVICE(u);
return unit_kill_common(u, who, signo, s->main_pid, s->control_pid, error);
}
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_EXITED] = "exited",
[SERVICE_RELOAD] = "reload",
[SERVICE_STOP] = "stop",
[SERVICE_STOP_SIGABRT] = "stop-sigabrt",
[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_FAILED] = "failed",
[SERVICE_AUTO_RESTART] = "auto-restart",
};
DEFINE_STRING_TABLE_LOOKUP(service_state, ServiceState);
static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
[SERVICE_RESTART_NO] = "no",
[SERVICE_RESTART_ON_SUCCESS] = "on-success",
[SERVICE_RESTART_ON_FAILURE] = "on-failure",
[SERVICE_RESTART_ON_ABNORMAL] = "on-abnormal",
[SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog",
[SERVICE_RESTART_ON_ABORT] = "on-abort",
[SERVICE_RESTART_ALWAYS] = "always",
};
DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
[SERVICE_SIMPLE] = "simple",
[SERVICE_FORKING] = "forking",
[SERVICE_ONESHOT] = "oneshot",
[SERVICE_DBUS] = "dbus",
[SERVICE_NOTIFY] = "notify",
[SERVICE_IDLE] = "idle"
};
DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_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);
static const char* const notify_access_table[_NOTIFY_ACCESS_MAX] = {
[NOTIFY_NONE] = "none",
[NOTIFY_MAIN] = "main",
[NOTIFY_ALL] = "all"
};
DEFINE_STRING_TABLE_LOOKUP(notify_access, NotifyAccess);
static const char* const notify_state_table[_NOTIFY_STATE_MAX] = {
[NOTIFY_UNKNOWN] = "unknown",
[NOTIFY_READY] = "ready",
[NOTIFY_RELOADING] = "reloading",
[NOTIFY_STOPPING] = "stopping",
};
DEFINE_STRING_TABLE_LOOKUP(notify_state, NotifyState);
static const char* const service_result_table[_SERVICE_RESULT_MAX] = {
[SERVICE_SUCCESS] = "success",
[SERVICE_FAILURE_RESOURCES] = "resources",
[SERVICE_FAILURE_TIMEOUT] = "timeout",
[SERVICE_FAILURE_EXIT_CODE] = "exit-code",
[SERVICE_FAILURE_SIGNAL] = "signal",
[SERVICE_FAILURE_CORE_DUMP] = "core-dump",
[SERVICE_FAILURE_WATCHDOG] = "watchdog",
[SERVICE_FAILURE_START_LIMIT] = "start-limit"
};
DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult);
const UnitVTable service_vtable = {
.object_size = sizeof(Service),
.exec_context_offset = offsetof(Service, exec_context),
.cgroup_context_offset = offsetof(Service, cgroup_context),
.kill_context_offset = offsetof(Service, kill_context),
.exec_runtime_offset = offsetof(Service, exec_runtime),
.sections =
"Unit\0"
"Service\0"
"Install\0",
.private_section = "Service",
.init = service_init,
.done = service_done,
.load = service_load,
.release_resources = service_release_resources,
.coldplug = service_coldplug,
.dump = service_dump,
.start = service_start,
.stop = service_stop,
.reload = service_reload,
.can_reload = service_can_reload,
.kill = service_kill,
.serialize = service_serialize,
.deserialize_item = service_deserialize_item,
.active_state = service_active_state,
.sub_state_to_string = service_sub_state_to_string,
.check_gc = service_check_gc,
.check_snapshot = service_check_snapshot,
.sigchld_event = service_sigchld_event,
.reset_failed = service_reset_failed,
.notify_cgroup_empty = service_notify_cgroup_empty_event,
.notify_message = service_notify_message,
.bus_name_owner_change = service_bus_name_owner_change,
.bus_interface = "org.freedesktop.systemd1.Service",
.bus_vtable = bus_service_vtable,
.bus_set_property = bus_service_set_property,
.bus_commit_properties = bus_service_commit_properties,
.get_timeout = service_get_timeout,
.can_transient = true,
.status_message_formats = {
.starting_stopping = {
[0] = "Starting %s...",
[1] = "Stopping %s...",
},
.finished_start_job = {
[JOB_DONE] = "Started %s.",
[JOB_FAILED] = "Failed to start %s.",
},
.finished_stop_job = {
[JOB_DONE] = "Stopped %s.",
[JOB_FAILED] = "Stopped (with error) %s.",
},
},
};