#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"

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

};

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)->id, "Stopping watch for %s's PID file %s", UNIT(s)->id, 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)->id, "%s: Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", UNIT(s)->id, 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)->id, r, "%s failed to reset watchdog timer: %m", UNIT(s)->id);

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)->id, r, "%s failed to add watchdog timer: %m", UNIT(s)->id);

return;

}

/* Let's process everything else which might be a sign

r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);

}

if (r < 0)

log_unit_warning_errno(UNIT(s)->id, r, "%s failed to install watchdog timer: %m", UNIT(s)->id);

}

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_debug("Releasing all resources for %s", u->id);

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

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;

}

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)->id, r, "%s: Couldn't add fd to fd store: %m", UNIT(s)->id);

if (r > 0) {

log_unit_debug(UNIT(s)->id, "%s: added fd to fd store.", UNIT(s)->id);

fd = -1;

}

}

if (fdset_size(fds) > 0)

log_unit_warning(UNIT(s)->id, "%s: tried to store more fds than FDStoreMax=%u allows, closing remaining.", UNIT(s)->id, 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);

}

return sd_event_add_time(

UNIT(s)->manager->event,

&s->timer_event_source,

CLOCK_MONOTONIC,

now(CLOCK_MONOTONIC) + usec, 0,

service_dispatch_timer, s);

}

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)->id, "%s lacks both ExecStart= and ExecStop= setting. Refusing.", UNIT(s)->id);

return -EINVAL;

}

if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) {

log_unit_error(UNIT(s)->id, "%s has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.", UNIT(s)->id);

return -EINVAL;

}

if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START]) {

log_unit_error(UNIT(s)->id, "%s has no ExecStart= setting, which is only allowed for RemainAfterExit=yes services. Refusing.", UNIT(s)->id);

return -EINVAL;

}

if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) {

log_unit_error(UNIT(s)->id, "%s has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.", UNIT(s)->id);

return -EINVAL;

}

if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {

log_unit_error(UNIT(s)->id, "%s has Restart= setting other than no, which isn't allowed for Type=oneshot services. Refusing.", UNIT(s)->id);

return -EINVAL;

}

if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) {

log_unit_error(UNIT(s)->id, "%s has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing.", UNIT(s)->id);

return -EINVAL;

}

if (s->type == SERVICE_DBUS && !s->bus_name) {

log_unit_error(UNIT(s)->id, "%s is of type D-Bus but no D-Bus service name has been specified. Refusing.", UNIT(s)->id);

return -EINVAL;

}

if (s->bus_name && s->type != SERVICE_DBUS)

log_unit_warning(UNIT(s)->id, "%s has a D-Bus service name specified, but is not of type dbus. Ignoring.", UNIT(s)->id);

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)->id, "%s has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.", UNIT(s)->id);

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

/* 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

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) {

#ifdef ENABLE_KDBUS

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;

#endif

r = unit_watch_bus_name(UNIT(s), s->bus_name);

if (r < 0)

return r;

}

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

r = unit_load_dropin(u);

if (r < 0)

return r;

/* This is a new unit? Then let's add in some

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(UNIT(s)->id, "PID file %s not readable (yet?) after %s.", 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)->id, 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)->id, "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)->id, "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)->id, "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(UNIT(s)->id, "Failed to watch PID "PID_FMT" from service %s", pid, UNIT(s)->id);

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

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)->id, "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(UNIT(s)->id, "Failed to watch PID "PID_FMT" from service %s", pid, UNIT(s)->id);

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_SIGTERM, SERVICE_STOP_SIGKILL,

SERVICE_STOP_SIGABRT, 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_SIGTERM, SERVICE_STOP_SIGKILL,

SERVICE_STOP_SIGABRT, 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_SIGTERM, SERVICE_STOP_SIGKILL,

SERVICE_STOP_SIGABRT, 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_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,

SERVICE_STOP_SIGABRT, 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,

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

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)->id, "%s changed %s -> %s", UNIT(s)->id, 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, Hashmap *deferred_work) {

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_SIGTERM, SERVICE_STOP_SIGKILL,

SERVICE_STOP_SIGABRT, 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_SIGTERM, SERVICE_STOP_SIGKILL,

SERVICE_STOP_SIGABRT, 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_SIGTERM, SERVICE_STOP_SIGKILL,

SERVICE_STOP_SIGABRT, 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 != SYSTEMD_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;

#ifdef ENABLE_KDBUS

if (s->exec_context.bus_endpoint) {

r = bus_kernel_create_endpoint(UNIT(s)->manager->running_as == SYSTEMD_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.

exec_params.bus_endpoint_fd = s->bus_endpoint_fd = r;

}

#endif

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.unit_id = UNIT(s)->id;

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(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

/* If we know the pid file, then lets just check if it is

if (s->main_pid_known) {

/* If it's an alien child let's check if it is still

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,

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 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)->id, "%s failed.", UNIT(s)->id);

failure_action(UNIT(s)->manager, s->failure_action, s->reboot_arg);

}

if (allow_restart &&

!s->forbid_restart &&

(s->restart == SERVICE_RESTART_ALWAYS ||

(s->restart == SERVICE_RESTART_ON_SUCCESS && s->result == SERVICE_SUCCESS) ||

(s->restart == SERVICE_RESTART_ON_FAILURE && s->result != SERVICE_SUCCESS) ||

(s->restart == SERVICE_RESTART_ON_ABNORMAL && !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE)) ||

(s->restart == SERVICE_RESTART_ON_WATCHDOG && s->result == SERVICE_FAILURE_WATCHDOG) ||

(s->restart == SERVICE_RESTART_ON_ABORT && IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP)) ||

(s->main_exec_status.code == CLD_EXITED && set_contains(s->restart_force_status.status, INT_TO_PTR(s->main_exec_status.status))) ||

(IN_SET(s->main_exec_status.code, CLD_KILLED, CLD_DUMPED) && set_contains(s->restart_force_status.signal, INT_TO_PTR(s->main_exec_status.status)))) &&

(s->main_exec_status.code != CLD_EXITED || !set_contains(s->restart_prevent_status.status, INT_TO_PTR(s->main_exec_status.status))) &&

(!IN_SET(s->main_exec_status.code, CLD_KILLED, CLD_DUMPED) || !set_contains(s->restart_prevent_status.signal, INT_TO_PTR(s->main_exec_status.status)))) {

r = service_arm_timer(s, s->restart_usec);

if (r < 0)

goto fail;

service_set_state(s, SERVICE_AUTO_RESTART);

}

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

if (s->pid_file)

unlink_noerrno(s->pid_file);

return;

fail:

log_unit_warning_errno(UNIT(s)->id, r, "%s failed to run install restart timer: %m", UNIT(s)->id);

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)->id, r, "%s failed to run 'stop-post' task: %m", UNIT(s)->id);

service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);

}

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 != SERVICE_STOP_SIGTERM && state != SERVICE_FINAL_SIGTERM && state != SERVICE_STOP_SIGABRT) ?

KILL_KILL : (state == SERVICE_STOP_SIGABRT ? KILL_ABORT : KILL_TERMINATE),

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 (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGABRT)

service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);

else if (state == SERVICE_STOP_SIGKILL)

service_enter_stop_post(s, SERVICE_SUCCESS);

else if (state == SERVICE_FINAL_SIGTERM)

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)->id, r, "%s failed to kill processes: %m", UNIT(s)->id);

if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL ||

state == SERVICE_STOP_SIGABRT)

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)->id, r, "%s failed to run 'stop' task: %m", UNIT(s)->id);

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()

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)->id, r, "%s failed to run 'start-post' task: %m", UNIT(s)->id);

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

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

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

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

/* For D-Bus services we know the main pid right away,

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)->id, r, "%s failed to run 'start' task: %m", UNIT(s)->id);

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

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)->id, r, "%s failed to run 'start-pre' task: %m", UNIT(s)->id);

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)->id, "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

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,

log_unit_debug(UNIT(s)->id, "%s scheduled restart job.", UNIT(s)->id);

return;

fail:

log_unit_warning(UNIT(s)->id, "%s failed to schedule restart job: %s", UNIT(s)->id, 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)->id, r, "%s failed to run 'reload' task: %m", UNIT(s)->id);

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)->id, r, "%s failed to run next control task: %m", UNIT(s)->id);

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)->id, r, "%s failed to run next main task: %m", UNIT(s)->id);

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)->id, "start request repeated too quickly for %s", UNIT(s)->id);

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

if (s->state == SERVICE_STOP ||

s->state == SERVICE_STOP_SIGABRT ||

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;

/* A service that will be restarted must be stopped first to

if (s->state == SERVICE_AUTO_RESTART)

return -EAGAIN;

assert(s->state == SERVICE_DEAD || s->state == 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 here. */

s->forbid_restart = true;

/* Already on it */

if (s->state == SERVICE_STOP ||

s->state == SERVICE_STOP_SIGABRT ||

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 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

if (s->state == SERVICE_START_PRE ||

s->state == SERVICE_START ||

s->state == SERVICE_START_POST ||

s->state == SERVICE_RELOAD) {

service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);

return 0;

}

assert(s->state == SERVICE_RUNNING ||

s->state == 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 0;

}

_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));

if (s->status_text)

unit_serialize_item(u, f, "status-text", s->status_text);

/* FIXME: There's a minor uncleanliness here: if there are

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->id, "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->id, "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->id, "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->id, "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->id, "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->id, "Failed to parse main-pid-known value %s", value);

else

s->main_pid_known = b;

} else if (streq(key, "status-text")) {

char *t;

t = strdup(value);

if (!t)

log_oom();

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->id, "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->id, "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->id, "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->id, "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->id, 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->id, "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->id, "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->id, "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->id, "Failed to parse forbid-restart value %s", value);

else

s->forbid_restart = b;

} else

log_unit_debug(u->id, "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,

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)->id, "Setting watch for %s's PID file %s", UNIT(s)->id, 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)->id, "Trying to read %s's PID file %s in case it changed", UNIT(s)->id, s->pid_file_pathspec->path);

service_retry_pid_file(s);

return 0;

fail:

log_unit_error_errno(UNIT(s)->id, r, "Failed to set a watch for %s's PID file %s: %m", UNIT(s)->id, 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

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)->id, "inotify event for %s", UNIT(s)->id);

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->id, "%s: cgroup is empty", u->id);

switch (s->state) {

/* Waiting for SIGCHLD is usually more interesting,

case SERVICE_START:

case SERVICE_START_POST:

/* If we were hoping for the daemon to write its PID file,

if (s->pid_file_pathspec) {

log_unit_warning(u->id, "%s never wrote its PID file. Failing.", UNIT(s)->id);

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.

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

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

if (s->exec_command[SERVICE_EXEC_START]->ignore)

f = SERVICE_SUCCESS;

}

log_unit_struct(u->id,

f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,

LOG_MESSAGE("%s: main process exited, code=%s, status=%i/%s",

u->id, 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 *

log_unit_debug(u->id, "%s running next main command for state %s", u->id, service_state_to_string(s->state));

service_run_next_main(s);

} else {

/* The service exited, so the service is officially

s->main_command = NULL;

switch (s->state) {

case SERVICE_START_POST:

case SERVICE_RELOAD:

case SERVICE_STOP:

/* Need to wait until the operation is

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->id,

f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,

"%s: control process exited, code=%s status=%i",

u->id, sigchld_code_to_string(code), status);

if (f != SERVICE_SUCCESS)

s->result = f;

/* Immediately get rid of the cgroup, so that the

service_kill_control_processes(s);

if (s->control_command &&

s->control_command->command_next &&

f == SERVICE_SUCCESS) {

/* There is another command to *

log_unit_debug(u->id, "%s running next control command for state %s", u->id, service_state_to_string(s->state));

service_run_next_control(s);

} else {

/* No further commands for this step, so let's

s->control_command = NULL;

s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;

log_unit_debug(u->id, "%s got final SIGCHLD for state %s", u->id, 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.

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

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

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)->id, "%s %s operation timed out. Terminating.", UNIT(s)->id, 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)->id, "%s start-post operation timed out. Stopping.", UNIT(s)->id);

service_enter_stop(s, SERVICE_FAILURE_TIMEOUT);

break;

case SERVICE_RELOAD:

log_unit_warning(UNIT(s)->id, "%s reload operation timed out. Stopping.", UNIT(s)->id);

s->reload_result = SERVICE_FAILURE_TIMEOUT;

service_enter_running(s, SERVICE_SUCCESS);

break;

case SERVICE_STOP:

log_unit_warning(UNIT(s)->id, "%s stopping timed out. Terminating.", UNIT(s)->id);

service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);

break;

case SERVICE_STOP_SIGABRT:

log_unit_warning(UNIT(s)->id,

"%s stop-sigabrt timed out. Terminating.", UNIT(s)->id);

service_enter_signal(s, SERVICE_STOP_SIGTERM, s->result);

break;

case SERVICE_STOP_SIGTERM:

if (s->kill_context.send_sigkill) {

log_unit_warning(UNIT(s)->id, "%s stop-sigterm timed out. Killing.", UNIT(s)->id);

service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT);

} else {

log_unit_warning(UNIT(s)->id, "%s stop-sigterm timed out. Skipping SIGKILL.", UNIT(s)->id);

service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);

}

break;

case SERVICE_STOP_SIGKILL:

/* Uh, we sent a SIGKILL and it is still not gone?

log_unit_warning(UNIT(s)->id, "%s still around after SIGKILL. Ignoring.", UNIT(s)->id);

service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);

break;

case SERVICE_STOP_POST:

log_unit_warning(UNIT(s)->id, "%s stop-post timed out. Terminating.", UNIT(s)->id);

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)->id, "%s stop-final-sigterm timed out. Killing.", UNIT(s)->id);

service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT);

} else {

log_unit_warning(UNIT(s)->id, "%s stop-final-sigterm timed out. Skipping SIGKILL. Entering failed mode.", UNIT(s)->id);

service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false);

}

break;

case SERVICE_FINAL_SIGKILL:

log_unit_warning(UNIT(s)->id, "%s still around after final SIGKILL. Entering failed mode.", UNIT(s)->id);

service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true);

break;

case SERVICE_AUTO_RESTART:

log_unit_info(UNIT(s)->id,

s->restart_usec > 0 ?

"%s holdoff time over, scheduling restart." :

"%s has no holdoff time, scheduling restart.",

UNIT(s)->id);

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)->id, "%s watchdog timeout (limit %s)!", UNIT(s)->id,

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, ", ");

log_unit_debug(u->id, "%s: Got notification message from PID "PID_FMT" (%s)",

u->id, pid, isempty(cc) ? "n/a" : cc);

if (s->notify_access == NOTIFY_NONE) {

log_unit_warning(u->id, "%s: Got notification message from PID "PID_FMT", but reception is disabled.", u->id, pid);

return;

}

if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) {

if (s->main_pid != 0)

log_unit_warning(u->id, "%s: Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, u->id, pid, s->main_pid);

else

log_unit_debug(u->id, "%s: Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", u->id, pid);

return;

}

/* 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->id, "Failed to parse MAINPID= field in notification message: %s", e);

else {

log_unit_debug(u->id, "%s: got MAINPID=%s", u->id, e);

service_set_main_pid(s, pid);

unit_watch_pid(UNIT(s), pid);

notify_dbus = true;

}

}

/* Interpret RELOADING= */

if (strv_find(tags, "RELOADING=1")) {

log_unit_debug(u->id, "%s: got RELOADING=1", u->id);

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")) {

log_unit_debug(u->id, "%s: got READY=1", u->id);

s->notify_state = NOTIFY_READY;

/* Type=notify services inform us about completed

if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START)

service_enter_start_post(s);

/* Sending READY=1 while we are reloading informs us

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")) {

log_unit_debug(u->id, "%s: got STOPPING=1", u->id);

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->id, "Status message in notification is not UTF-8 clean.");

else {

log_unit_debug(u->id, "%s: got STATUS=%s", u->id, e);

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->id, "Failed to parse ERRNO= field in notification message: %s", e);

else {

log_unit_debug(u->id, "%s: got ERRNO=%s", u->id, e);

if (s->status_errno != status_errno) {

s->status_errno = status_errno;

notify_dbus = true;

}

}

}

/* Interpret WATCHDOG= */

if (strv_find(tags, "WATCHDOG=1")) {

log_unit_debug(u->id, "%s: got WATCHDOG=1", u->id);

service_reset_watchdog(s);

}

/* Add the passed fds to the fd store */

if (strv_find(tags, "FDSTORE=1")) {

log_unit_debug(u->id, "%s: got FDSTORE=1", u->id);

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->id, "%s's D-Bus name %s changed owner from %s to %s", u->id, name, old_owner, new_owner);

else if (old_owner)

log_unit_debug(u->id, "%s's D-Bus name %s no longer registered by %s", u->id, name, old_owner);

else

log_unit_debug(u->id, "%s's D-Bus name %s now registered by %s", u->id, name, new_owner);

s->bus_name_good = !!new_owner;

if (s->type == SERVICE_DBUS) {

/* service_enter_running() will figure out what to

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) {