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systemd/src/service.c

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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 General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <signal.h>
#include <dirent.h>
#include <unistd.h>
#include "unit.h"
#include "service.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
#include "strv.h"
#include "unit-name.h"
#include "dbus-service.h"
#include "special.h"
#include "bus-errors.h"
#include "exit-status.h"
#include "def.h"
#include "util.h"
#ifdef HAVE_SYSV_COMPAT
#define DEFAULT_SYSV_TIMEOUT_USEC (5*USEC_PER_MINUTE)
typedef enum RunlevelType {
RUNLEVEL_UP,
RUNLEVEL_DOWN,
RUNLEVEL_SYSINIT
} RunlevelType;
static const struct {
const char *path;
const char *target;
const RunlevelType type;
} rcnd_table[] = {
/* Standard SysV runlevels for start-up */
{ "rc1.d", SPECIAL_RESCUE_TARGET, RUNLEVEL_UP },
{ "rc2.d", SPECIAL_RUNLEVEL2_TARGET, RUNLEVEL_UP },
{ "rc3.d", SPECIAL_RUNLEVEL3_TARGET, RUNLEVEL_UP },
{ "rc4.d", SPECIAL_RUNLEVEL4_TARGET, RUNLEVEL_UP },
{ "rc5.d", SPECIAL_RUNLEVEL5_TARGET, RUNLEVEL_UP },
#ifdef TARGET_SUSE
/* SUSE style boot.d */
{ "boot.d", SPECIAL_SYSINIT_TARGET, RUNLEVEL_SYSINIT },
#endif
#if defined(TARGET_DEBIAN) || defined(TARGET_UBUNTU) || defined(TARGET_ANGSTROM)
/* Debian style rcS.d */
{ "rcS.d", SPECIAL_SYSINIT_TARGET, RUNLEVEL_SYSINIT },
#endif
/* Standard SysV runlevels for shutdown */
{ "rc0.d", SPECIAL_POWEROFF_TARGET, RUNLEVEL_DOWN },
{ "rc6.d", SPECIAL_REBOOT_TARGET, RUNLEVEL_DOWN }
/* Note that the order here matters, as we read the
directories in this order, and we want to make sure that
sysv_start_priority is known when we first load the
unit. And that value we only know from S links. Hence
UP/SYSINIT must be read before DOWN */
};
#define RUNLEVELS_UP "12345"
/* #define RUNLEVELS_DOWN "06" */
/* #define RUNLEVELS_BOOT "bBsS" */
#endif
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_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 void service_init(Unit *u) {
Service *s = SERVICE(u);
assert(u);
assert(u->meta.load_state == UNIT_STUB);
s->timeout_usec = DEFAULT_TIMEOUT_USEC;
s->restart_usec = DEFAULT_RESTART_USEC;
s->timer_watch.type = WATCH_INVALID;
#ifdef HAVE_SYSV_COMPAT
s->sysv_start_priority = -1;
s->sysv_start_priority_from_rcnd = -1;
#endif
s->socket_fd = -1;
s->guess_main_pid = true;
exec_context_init(&s->exec_context);
RATELIMIT_INIT(s->ratelimit, 10*USEC_PER_SEC, 5);
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 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;
s->main_pid = pid;
s->main_pid_known = true;
if (get_parent_of_pid(pid, &ppid) >= 0 && ppid != getpid()) {
log_warning("%s: Supervising process %lu which is not our child. We'll most likely not notice when it exits.",
s->meta.id, (unsigned long) pid);
s->main_pid_alien = true;
} else
s->main_pid_alien = false;
exec_status_start(&s->main_exec_status, pid);
return 0;
}
static void service_close_socket_fd(Service *s) {
assert(s);
if (s->socket_fd < 0)
return;
close_nointr_nofail(s->socket_fd);
s->socket_fd = -1;
}
static void service_connection_unref(Service *s) {
assert(s);
if (!s->accept_socket)
return;
socket_connection_unref(s->accept_socket);
s->accept_socket = NULL;
}
static void service_done(Unit *u) {
Service *s = SERVICE(u);
assert(s);
free(s->pid_file);
s->pid_file = NULL;
#ifdef HAVE_SYSV_COMPAT
free(s->sysv_path);
s->sysv_path = NULL;
free(s->sysv_runlevels);
s->sysv_runlevels = NULL;
#endif
free(s->status_text);
s->status_text = NULL;
exec_context_done(&s->exec_context);
exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
s->control_command = NULL;
s->main_command = NULL;
/* 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);
if (s->bus_name) {
unit_unwatch_bus_name(UNIT(u), s->bus_name);
free(s->bus_name);
s->bus_name = NULL;
}
service_close_socket_fd(s);
service_connection_unref(s);
set_free(s->configured_sockets);
unit_unwatch_timer(u, &s->timer_watch);
}
#ifdef HAVE_SYSV_COMPAT
static char *sysv_translate_name(const char *name) {
char *r;
if (!(r = new(char, strlen(name) + sizeof(".service"))))
return NULL;
#if defined(TARGET_DEBIAN) || defined(TARGET_UBUNTU) || defined(TARGET_ANGSTROM)
if (endswith(name, ".sh"))
/* Drop Debian-style .sh suffix */
strcpy(stpcpy(r, name) - 3, ".service");
#endif
#ifdef TARGET_SUSE
if (startswith(name, "boot."))
/* Drop SuSE-style boot. prefix */
strcpy(stpcpy(r, name + 5), ".service");
#endif
#ifdef TARGET_FRUGALWARE
if (startswith(name, "rc."))
/* Drop Frugalware-style rc. prefix */
strcpy(stpcpy(r, name + 3), ".service");
#endif
else
/* Normal init scripts */
strcpy(stpcpy(r, name), ".service");
return r;
}
static int sysv_translate_facility(const char *name, const char *filename, char **_r) {
/* We silently ignore the $ prefix here. According to the LSB
* spec it simply indicates whether something is a
* standardized name or a distribution-specific one. Since we
* just follow what already exists and do not introduce new
* uses or names we don't care who introduced a new name. */
static const char * const table[] = {
/* LSB defined facilities */
"local_fs", SPECIAL_LOCAL_FS_TARGET,
#ifndef TARGET_MANDRIVA
/* Due to unfortunate name selection in Mandriva,
* $network is provided by network-up which is ordered
* after network which actually starts interfaces.
* To break the loop, just ignore it */
"network", SPECIAL_NETWORK_TARGET,
#endif
"named", SPECIAL_NSS_LOOKUP_TARGET,
"portmap", SPECIAL_RPCBIND_TARGET,
"remote_fs", SPECIAL_REMOTE_FS_TARGET,
"syslog", SPECIAL_SYSLOG_TARGET,
"time", SPECIAL_TIME_SYNC_TARGET,
/* common extensions */
"mail-transfer-agent", SPECIAL_MAIL_TRANSFER_AGENT_TARGET,
"x-display-manager", SPECIAL_DISPLAY_MANAGER_SERVICE,
"null", NULL,
#if defined(TARGET_DEBIAN) || defined(TARGET_UBUNTU) || defined(TARGET_ANGSTROM)
"mail-transport-agent", SPECIAL_MAIL_TRANSFER_AGENT_TARGET,
#endif
#ifdef TARGET_FEDORA
"MTA", SPECIAL_MAIL_TRANSFER_AGENT_TARGET,
"smtpdaemon", SPECIAL_MAIL_TRANSFER_AGENT_TARGET,
"httpd", SPECIAL_HTTP_DAEMON_TARGET,
#endif
#ifdef TARGET_SUSE
"smtp", SPECIAL_MAIL_TRANSFER_AGENT_TARGET,
#endif
};
unsigned i;
char *r;
const char *n;
assert(name);
assert(_r);
n = *name == '$' ? name + 1 : name;
for (i = 0; i < ELEMENTSOF(table); i += 2) {
if (!streq(table[i], n))
continue;
if (!table[i+1])
return 0;
if (!(r = strdup(table[i+1])))
return -ENOMEM;
goto finish;
}
/* If we don't know this name, fallback heuristics to figure
* out whether something is a target or a service alias. */
if (*name == '$') {
if (!unit_prefix_is_valid(n))
return -EINVAL;
/* Facilities starting with $ are most likely targets */
r = unit_name_build(n, NULL, ".target");
} else if (filename && streq(name, filename))
/* Names equaling the file name of the services are redundant */
return 0;
else
/* Everything else we assume to be normal service names */
r = sysv_translate_name(n);
if (!r)
return -ENOMEM;
finish:
*_r = r;
return 1;
}
static int sysv_fix_order(Service *s) {
Meta *other;
int r;
assert(s);
if (s->sysv_start_priority < 0)
return 0;
/* For each pair of services where at least one lacks a LSB
* header, we use the start priority value to order things. */
LIST_FOREACH(units_by_type, other, s->meta.manager->units_by_type[UNIT_SERVICE]) {
Service *t;
UnitDependency d;
bool special_s, special_t;
t = (Service*) other;
if (s == t)
continue;
if (t->meta.load_state != UNIT_LOADED)
continue;
if (t->sysv_start_priority < 0)
continue;
/* If both units have modern headers we don't care
* about the priorities */
if ((s->meta.fragment_path || s->sysv_has_lsb) &&
(t->meta.fragment_path || t->sysv_has_lsb))
continue;
special_s = s->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, s->sysv_runlevels);
special_t = t->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, t->sysv_runlevels);
if (special_t && !special_s)
d = UNIT_AFTER;
else if (special_s && !special_t)
d = UNIT_BEFORE;
else if (t->sysv_start_priority < s->sysv_start_priority)
d = UNIT_AFTER;
else if (t->sysv_start_priority > s->sysv_start_priority)
d = UNIT_BEFORE;
else
continue;
/* FIXME: Maybe we should compare the name here lexicographically? */
if ((r = unit_add_dependency(UNIT(s), d, UNIT(t), true)) < 0)
return r;
}
return 0;
}
static ExecCommand *exec_command_new(const char *path, const char *arg1) {
ExecCommand *c;
if (!(c = new0(ExecCommand, 1)))
return NULL;
if (!(c->path = strdup(path))) {
free(c);
return NULL;
}
if (!(c->argv = strv_new(path, arg1, NULL))) {
free(c->path);
free(c);
return NULL;
}
return c;
}
static int sysv_exec_commands(Service *s) {
ExecCommand *c;
assert(s);
assert(s->sysv_path);
if (!(c = exec_command_new(s->sysv_path, "start")))
return -ENOMEM;
exec_command_append_list(s->exec_command+SERVICE_EXEC_START, c);
if (!(c = exec_command_new(s->sysv_path, "stop")))
return -ENOMEM;
exec_command_append_list(s->exec_command+SERVICE_EXEC_STOP, c);
if (!(c = exec_command_new(s->sysv_path, "reload")))
return -ENOMEM;
exec_command_append_list(s->exec_command+SERVICE_EXEC_RELOAD, c);
return 0;
}
static int service_load_sysv_path(Service *s, const char *path) {
FILE *f;
Unit *u;
unsigned line = 0;
int r;
enum {
NORMAL,
DESCRIPTION,
LSB,
LSB_DESCRIPTION
} state = NORMAL;
char *short_description = NULL, *long_description = NULL, *chkconfig_description = NULL, *description;
struct stat st;
assert(s);
assert(path);
u = UNIT(s);
if (!(f = fopen(path, "re"))) {
r = errno == ENOENT ? 0 : -errno;
goto finish;
}
zero(st);
if (fstat(fileno(f), &st) < 0) {
r = -errno;
goto finish;
}
free(s->sysv_path);
if (!(s->sysv_path = strdup(path))) {
r = -ENOMEM;
goto finish;
}
s->sysv_mtime = timespec_load(&st.st_mtim);
if (null_or_empty(&st)) {
u->meta.load_state = UNIT_MASKED;
r = 0;
goto finish;
}
while (!feof(f)) {
char l[LINE_MAX], *t;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
r = -errno;
log_error("Failed to read configuration file '%s': %s", path, strerror(-r));
goto finish;
}
line++;
t = strstrip(l);
if (*t != '#')
continue;
if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) {
state = LSB;
s->sysv_has_lsb = true;
continue;
}
if ((state == LSB_DESCRIPTION || state == LSB) && streq(t, "### END INIT INFO")) {
state = NORMAL;
continue;
}
t++;
t += strspn(t, WHITESPACE);
if (state == NORMAL) {
/* Try to parse Red Hat style chkconfig headers */
if (startswith_no_case(t, "chkconfig:")) {
int start_priority;
char runlevels[16], *k;
state = NORMAL;
if (sscanf(t+10, "%15s %i %*i",
runlevels,
&start_priority) != 2) {
log_warning("[%s:%u] Failed to parse chkconfig line. Ignoring.", path, line);
continue;
}
/* A start priority gathered from the
* symlink farms is preferred over the
* data from the LSB header. */
if (start_priority < 0 || start_priority > 99)
log_warning("[%s:%u] Start priority out of range. Ignoring.", path, line);
else
s->sysv_start_priority = start_priority;
char_array_0(runlevels);
k = delete_chars(runlevels, WHITESPACE "-");
if (k[0]) {
char *d;
if (!(d = strdup(k))) {
r = -ENOMEM;
goto finish;
}
free(s->sysv_runlevels);
s->sysv_runlevels = d;
}
} else if (startswith_no_case(t, "description:")) {
size_t k = strlen(t);
char *d;
const char *j;
if (t[k-1] == '\\') {
state = DESCRIPTION;
t[k-1] = 0;
}
if ((j = strstrip(t+12)) && *j) {
if (!(d = strdup(j))) {
r = -ENOMEM;
goto finish;
}
} else
d = NULL;
free(chkconfig_description);
chkconfig_description = d;
} else if (startswith_no_case(t, "pidfile:")) {
char *fn;
state = NORMAL;
fn = strstrip(t+8);
if (!path_is_absolute(fn)) {
log_warning("[%s:%u] PID file not absolute. Ignoring.", path, line);
continue;
}
if (!(fn = strdup(fn))) {
r = -ENOMEM;
goto finish;
}
free(s->pid_file);
s->pid_file = fn;
}
} else if (state == DESCRIPTION) {
/* Try to parse Red Hat style description
* continuation */
size_t k = strlen(t);
char *j;
if (t[k-1] == '\\')
t[k-1] = 0;
else
state = NORMAL;
if ((j = strstrip(t)) && *j) {
char *d = NULL;
if (chkconfig_description)
d = join(chkconfig_description, " ", j, NULL);
else
d = strdup(j);
if (!d) {
r = -ENOMEM;
goto finish;
}
free(chkconfig_description);
chkconfig_description = d;
}
} else if (state == LSB || state == LSB_DESCRIPTION) {
if (startswith_no_case(t, "Provides:")) {
char *i, *w;
size_t z;
state = LSB;
FOREACH_WORD_QUOTED(w, z, t+9, i) {
char *n, *m;
if (!(n = strndup(w, z))) {
r = -ENOMEM;
goto finish;
}
r = sysv_translate_facility(n, file_name_from_path(path), &m);
free(n);
if (r < 0)
goto finish;
if (r == 0)
continue;
if (unit_name_to_type(m) == UNIT_SERVICE)
r = unit_add_name(u, m);
else
/* NB: SysV targets
* which are provided
* by a service are
* pulled in by the
* services, as an
* indication that the
* generic service is
* now available. This
* is strictly
* one-way. The
* targets do NOT pull
* in the SysV
* services! */
r = unit_add_two_dependencies_by_name(u, UNIT_BEFORE, UNIT_WANTS, m, NULL, true);
if (r < 0)
log_error("[%s:%u] Failed to add LSB Provides name %s, ignoring: %s", path, line, m, strerror(-r));
free(m);
}
} else if (startswith_no_case(t, "Required-Start:") ||
startswith_no_case(t, "Should-Start:") ||
startswith_no_case(t, "X-Start-Before:") ||
startswith_no_case(t, "X-Start-After:")) {
char *i, *w;
size_t z;
state = LSB;
FOREACH_WORD_QUOTED(w, z, strchr(t, ':')+1, i) {
char *n, *m;
if (!(n = strndup(w, z))) {
r = -ENOMEM;
goto finish;
}
r = sysv_translate_facility(n, file_name_from_path(path), &m);
if (r < 0) {
log_error("[%s:%u] Failed to translate LSB dependency %s, ignoring: %s", path, line, n, strerror(-r));
free(n);
continue;
}
free(n);
if (r == 0)
continue;
r = unit_add_dependency_by_name(u, startswith_no_case(t, "X-Start-Before:") ? UNIT_BEFORE : UNIT_AFTER, m, NULL, true);
if (r < 0)
log_error("[%s:%u] Failed to add dependency on %s, ignoring: %s", path, line, m, strerror(-r));
free(m);
}
} else if (startswith_no_case(t, "Default-Start:")) {
char *k, *d;
state = LSB;
k = delete_chars(t+14, WHITESPACE "-");
if (k[0] != 0) {
if (!(d = strdup(k))) {
r = -ENOMEM;
goto finish;
}
free(s->sysv_runlevels);
s->sysv_runlevels = d;
}
} else if (startswith_no_case(t, "Description:")) {
char *d, *j;
state = LSB_DESCRIPTION;
if ((j = strstrip(t+12)) && *j) {
if (!(d = strdup(j))) {
r = -ENOMEM;
goto finish;
}
} else
d = NULL;
free(long_description);
long_description = d;
} else if (startswith_no_case(t, "Short-Description:")) {
char *d, *j;
state = LSB;
if ((j = strstrip(t+18)) && *j) {
if (!(d = strdup(j))) {
r = -ENOMEM;
goto finish;
}
} else
d = NULL;
free(short_description);
short_description = d;
} else if (state == LSB_DESCRIPTION) {
if (startswith(l, "#\t") || startswith(l, "# ")) {
char *j;
if ((j = strstrip(t)) && *j) {
char *d = NULL;
if (long_description)
d = join(long_description, " ", t, NULL);
else
d = strdup(j);
if (!d) {
r = -ENOMEM;
goto finish;
}
free(long_description);
long_description = d;
}
} else
state = LSB;
}
}
}
if ((r = sysv_exec_commands(s)) < 0)
goto finish;
if (s->sysv_runlevels && !chars_intersect(RUNLEVELS_UP, s->sysv_runlevels)) {
/* If there a runlevels configured for this service
* but none of the standard ones, then we assume this
* is some special kind of service (which might be
* needed for early boot) and don't create any links
* to it. */
s->meta.default_dependencies = false;
/* Don't timeout special services during boot (like fsck) */
s->timeout_usec = 0;
} else
s->timeout_usec = DEFAULT_SYSV_TIMEOUT_USEC;
/* Special setting for all SysV services */
s->type = SERVICE_FORKING;
s->remain_after_exit = !s->pid_file;
s->restart = SERVICE_RESTART_NO;
if (s->meta.manager->sysv_console)
s->exec_context.std_output = EXEC_OUTPUT_TTY;
s->exec_context.kill_mode = KILL_PROCESS;
/* We use the long description only if
* no short description is set. */
if (short_description)
description = short_description;
else if (chkconfig_description)
description = chkconfig_description;
else if (long_description)
description = long_description;
else
description = NULL;
if (description) {
char *d;
if (!(d = strappend(s->sysv_has_lsb ? "LSB: " : "SYSV: ", description))) {
r = -ENOMEM;
goto finish;
}
u->meta.description = d;
}
/* The priority that has been set in /etc/rcN.d/ hierarchies
* takes precedence over what is stored as default in the LSB
* header */
if (s->sysv_start_priority_from_rcnd >= 0)
s->sysv_start_priority = s->sysv_start_priority_from_rcnd;
u->meta.load_state = UNIT_LOADED;
r = 0;
finish:
if (f)
fclose(f);
free(short_description);
free(long_description);
free(chkconfig_description);
return r;
}
static int service_load_sysv_name(Service *s, const char *name) {
char **p;
assert(s);
assert(name);
/* For SysV services we strip the boot.*, rc.* and *.sh
* prefixes/suffixes. */
#if defined(TARGET_DEBIAN) || defined(TARGET_UBUNTU) || defined(TARGET_ANGSTROM)
if (endswith(name, ".sh.service"))
return -ENOENT;
#endif
#ifdef TARGET_SUSE
if (startswith(name, "boot."))
return -ENOENT;
#endif
#ifdef TARGET_FRUGALWARE
if (startswith(name, "rc."))
return -ENOENT;
#endif
STRV_FOREACH(p, s->meta.manager->lookup_paths.sysvinit_path) {
char *path;
int r;
path = join(*p, "/", name, NULL);
if (!path)
return -ENOMEM;
assert(endswith(path, ".service"));
path[strlen(path)-8] = 0;
r = service_load_sysv_path(s, path);
#if defined(TARGET_DEBIAN) || defined(TARGET_UBUNTU) || defined(TARGET_ANGSTROM)
if (r >= 0 && s->meta.load_state == UNIT_STUB) {
/* Try Debian style *.sh source'able init scripts */
strcat(path, ".sh");
r = service_load_sysv_path(s, path);
}
#endif
free(path);
#ifdef TARGET_SUSE
if (r >= 0 && s->meta.load_state == UNIT_STUB) {
/* Try SUSE style boot.* init scripts */
path = join(*p, "/boot.", name, NULL);
if (!path)
return -ENOMEM;
/* Drop .service suffix */
path[strlen(path)-8] = 0;
r = service_load_sysv_path(s, path);
free(path);
}
#endif
#ifdef TARGET_FRUGALWARE
if (r >= 0 && s->meta.load_state == UNIT_STUB) {
/* Try Frugalware style rc.* init scripts */
path = join(*p, "/rc.", name, NULL);
if (!path)
return -ENOMEM;
/* Drop .service suffix */
path[strlen(path)-8] = 0;
r = service_load_sysv_path(s, path);
free(path);
}
#endif
if (r < 0)
return r;
if ((s->meta.load_state != UNIT_STUB))
break;
}
return 0;
}
static int service_load_sysv(Service *s) {
const char *t;
Iterator i;
int r;
assert(s);
/* Load service data from SysV init scripts, preferably with
* LSB headers ... */
if (strv_isempty(s->meta.manager->lookup_paths.sysvinit_path))
return 0;
if ((t = s->meta.id))
if ((r = service_load_sysv_name(s, t)) < 0)
return r;
if (s->meta.load_state == UNIT_STUB)
SET_FOREACH(t, s->meta.names, i) {
if (t == s->meta.id)
continue;
if ((r = service_load_sysv_name(s, t)) < 0)
return r;
if (s->meta.load_state != UNIT_STUB)
break;
}
return 0;
}
#endif
static int fsck_fix_order(Service *s) {
Meta *other;
int r;
assert(s);
if (s->fsck_passno <= 0)
return 0;
/* For each pair of services where both have an fsck priority
* we order things based on it. */
LIST_FOREACH(units_by_type, other, s->meta.manager->units_by_type[UNIT_SERVICE]) {
Service *t;
UnitDependency d;
t = (Service*) other;
if (s == t)
continue;
if (t->meta.load_state != UNIT_LOADED)
continue;
if (t->fsck_passno <= 0)
continue;
if (t->fsck_passno < s->fsck_passno)
d = UNIT_AFTER;
else if (t->fsck_passno > s->fsck_passno)
d = UNIT_BEFORE;
else
continue;
if ((r = unit_add_dependency(UNIT(s), d, UNIT(t), true)) < 0)
return r;
}
return 0;
}
static int service_verify(Service *s) {
assert(s);
if (s->meta.load_state != UNIT_LOADED)
return 0;
if (!s->exec_command[SERVICE_EXEC_START]) {
log_error("%s lacks ExecStart setting. Refusing.", s->meta.id);
return -EINVAL;
}
if (s->type != SERVICE_ONESHOT &&
s->exec_command[SERVICE_EXEC_START]->command_next) {
log_error("%s has more than one ExecStart setting, which is only allowed for Type=oneshot services. Refusing.", s->meta.id);
return -EINVAL;
}
if (s->type == SERVICE_ONESHOT &&
s->exec_command[SERVICE_EXEC_RELOAD]) {
log_error("%s has an ExecReload setting, which is not allowed for Type=oneshot services. Refusing.", s->meta.id);
return -EINVAL;
}
if (s->type == SERVICE_DBUS && !s->bus_name) {
log_error("%s is of type D-Bus but no D-Bus service name has been specified. Refusing.", s->meta.id);
return -EINVAL;
}
if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) {
log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.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
* majority of services. */
/* First, pull in base system */
if (s->meta.manager->running_as == MANAGER_SYSTEM) {
if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_BASIC_TARGET, NULL, true)) < 0)
return r;
} else if (s->meta.manager->running_as == MANAGER_USER) {
if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SOCKETS_TARGET, NULL, true)) < 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 = s->meta.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 = s->meta.manager->default_std_output;
}
static int service_load(Unit *u) {
int r;
Service *s = SERVICE(u);
assert(s);
/* Load a .service file */
if ((r = unit_load_fragment(u)) < 0)
return r;
#ifdef HAVE_SYSV_COMPAT
/* Load a classic init script as a fallback, if we couldn't find anything */
if (u->meta.load_state == UNIT_STUB)
if ((r = service_load_sysv(s)) < 0)
return r;
#endif
/* Still nothing found? Then let's give up */
if (u->meta.load_state == UNIT_STUB)
return -ENOENT;
/* We were able to load something, then let's add in the
* dropin directories. */
if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
return r;
/* This is a new unit? Then let's add in some extras */
if (u->meta.load_state == UNIT_LOADED) {
service_fix_output(s);
if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
return r;
if ((r = unit_add_default_cgroups(u)) < 0)
return r;
#ifdef HAVE_SYSV_COMPAT
if ((r = sysv_fix_order(s)) < 0)
return r;
#endif
if ((r = fsck_fix_order(s)) < 0)
return r;
if (s->bus_name)
if ((r = unit_watch_bus_name(u, s->bus_name)) < 0)
return r;
if (s->type == SERVICE_NOTIFY && s->notify_access == NOTIFY_NONE)
s->notify_access = NOTIFY_MAIN;
if (s->type == SERVICE_DBUS || s->bus_name)
if ((r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_REQUIRES, SPECIAL_DBUS_SOCKET, NULL, true)) < 0)
return r;
if (s->meta.default_dependencies)
if ((r = service_add_default_dependencies(s)) < 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;
char *p2;
assert(s);
p2 = strappend(prefix, "\t");
prefix2 = p2 ? p2 : prefix;
fprintf(f,
"%sService State: %s\n"
"%sPermissionsStartOnly: %s\n"
"%sRootDirectoryStartOnly: %s\n"
"%sRemainAfterExit: %s\n"
"%sGuessMainPID: %s\n"
"%sType: %s\n"
"%sRestart: %s\n"
"%sNotifyAccess: %s\n",
prefix, service_state_to_string(s->state),
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));
if (s->control_pid > 0)
fprintf(f,
"%sControl PID: %lu\n",
prefix, (unsigned long) s->control_pid);
if (s->main_pid > 0)
fprintf(f,
"%sMain PID: %lu\n"
"%sMain PID Known: %s\n"
"%sMain PID Alien: %s\n",
prefix, (unsigned long) 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));
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);
}
#ifdef HAVE_SYSV_COMPAT
if (s->sysv_path)
fprintf(f,
"%sSysV Init Script Path: %s\n"
"%sSysV Init Script has LSB Header: %s\n"
"%sSysVEnabled: %s\n",
prefix, s->sysv_path,
prefix, yes_no(s->sysv_has_lsb),
prefix, yes_no(s->sysv_enabled));
if (s->sysv_start_priority >= 0)
fprintf(f,
"%sSysVStartPriority: %i\n",
prefix, s->sysv_start_priority);
if (s->sysv_runlevels)
fprintf(f, "%sSysVRunLevels: %s\n",
prefix, s->sysv_runlevels);
#endif
if (s->fsck_passno > 0)
fprintf(f,
"%sFsckPassNo: %i\n",
prefix, s->fsck_passno);
if (s->status_text)
fprintf(f, "%sStatus Text: %s\n",
prefix, s->status_text);
free(p2);
}
static int service_load_pid_file(Service *s, bool warn_if_missing) {
char *k;
int r;
pid_t pid;
assert(s);
if (!s->pid_file)
return -ENOENT;
if ((r = read_one_line_file(s->pid_file, &k)) < 0) {
if (warn_if_missing)
log_warning("Failed to read PID file %s after %s. The service might be broken.",
s->pid_file, service_state_to_string(s->state));
return r;
}
r = parse_pid(k, &pid);
free(k);
if (r < 0)
return r;
if (kill(pid, 0) < 0 && errno != EPERM) {
log_warning("PID %lu read from file %s does not exist. Your service or init script might be broken.",
(unsigned long) pid, s->pid_file);
return -ESRCH;
}
if (s->main_pid_known) {
if (pid == s->main_pid)
return 0;
log_debug("Main PID changing: %lu -> %lu",
(unsigned long) s->main_pid, (unsigned long) pid);
service_unwatch_main_pid(s);
s->main_pid_known = false;
}
if ((r = service_set_main_pid(s, pid)) < 0)
return r;
if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
/* FIXME: we need to do something here */
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);
if ((pid = cgroup_bonding_search_main_pid_list(s->meta.cgroup_bondings)) <= 0)
return -ENOENT;
if ((r = service_set_main_pid(s, pid)) < 0)
return r;
if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
/* FIXME: we need to do something here */
return r;
return 0;
}
static int service_get_sockets(Service *s, Set **_set) {
Set *set;
Iterator i;
char *t;
int r;
assert(s);
assert(_set);
if (s->socket_fd >= 0)
return 0;
if (!set_isempty(s->configured_sockets))
return 0;
/* Collects all Socket objects that belong to this
* service. Note that a service might have multiple sockets
* via multiple names. */
if (!(set = set_new(NULL, NULL)))
return -ENOMEM;
SET_FOREACH(t, s->meta.names, i) {
char *k;
Unit *p;
/* Look for all socket objects that go by any of our
* units and collect their fds */
if (!(k = unit_name_change_suffix(t, ".socket"))) {
r = -ENOMEM;
goto fail;
}
p = manager_get_unit(s->meta.manager, k);
free(k);
if (!p)
continue;
if ((r = set_put(set, p)) < 0)
goto fail;
}
*_set = set;
return 0;
fail:
set_free(set);
return r;
}
static int service_notify_sockets_dead(Service *s) {
Iterator i;
Set *set, *free_set = NULL;
Socket *sock;
int r;
assert(s);
/* Notifies all our sockets when we die */
if (s->socket_fd >= 0)
return 0;
if (!set_isempty(s->configured_sockets))
set = s->configured_sockets;
else {
if ((r = service_get_sockets(s, &free_set)) < 0)
return r;
set = free_set;
}
SET_FOREACH(sock, set, i)
socket_notify_service_dead(sock);
set_free(free_set);
return 0;
}
static void service_set_state(Service *s, ServiceState state) {
ServiceState old_state;
assert(s);
old_state = s->state;
s->state = state;
if (state != SERVICE_START_PRE &&
state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL &&
state != SERVICE_STOP_POST &&
state != SERVICE_FINAL_SIGTERM &&
state != SERVICE_FINAL_SIGKILL &&
state != SERVICE_AUTO_RESTART)
unit_unwatch_timer(UNIT(s), &s->timer_watch);
if (state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RUNNING &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL) {
service_unwatch_main_pid(s);
s->main_command = NULL;
}
if (state != SERVICE_START_PRE &&
state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL &&
state != SERVICE_STOP_POST &&
state != SERVICE_FINAL_SIGTERM &&
state != SERVICE_FINAL_SIGKILL) {
service_unwatch_control_pid(s);
s->control_command = NULL;
s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
}
if (state == SERVICE_DEAD ||
state == SERVICE_STOP ||
state == SERVICE_STOP_SIGTERM ||
state == SERVICE_STOP_SIGKILL ||
state == SERVICE_STOP_POST ||
state == SERVICE_FINAL_SIGTERM ||
state == SERVICE_FINAL_SIGKILL ||
state == SERVICE_FAILED ||
state == SERVICE_AUTO_RESTART)
service_notify_sockets_dead(s);
if (state != SERVICE_START_PRE &&
state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RUNNING &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL &&
state != SERVICE_STOP_POST &&
state != SERVICE_FINAL_SIGTERM &&
state != SERVICE_FINAL_SIGKILL &&
!(state == SERVICE_DEAD && s->meta.job)) {
service_close_socket_fd(s);
service_connection_unref(s);
}
/* For the inactive states unit_notify() will trim the cgroup,
* but for exit we have to do that ourselves... */
if (state == SERVICE_EXITED && s->meta.manager->n_reloading <= 0)
cgroup_bonding_trim_list(s->meta.cgroup_bondings, true);
if (old_state != state)
log_debug("%s changed %s -> %s", s->meta.id, service_state_to_string(old_state), service_state_to_string(state));
unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], !s->reload_failure);
s->reload_failure = false;
}
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 (s->deserialized_state == SERVICE_START_PRE ||
s->deserialized_state == SERVICE_START ||
s->deserialized_state == SERVICE_START_POST ||
s->deserialized_state == SERVICE_RELOAD ||
s->deserialized_state == SERVICE_STOP ||
s->deserialized_state == SERVICE_STOP_SIGTERM ||
s->deserialized_state == SERVICE_STOP_SIGKILL ||
s->deserialized_state == SERVICE_STOP_POST ||
s->deserialized_state == SERVICE_FINAL_SIGTERM ||
s->deserialized_state == SERVICE_FINAL_SIGKILL ||
s->deserialized_state == SERVICE_AUTO_RESTART) {
if (s->deserialized_state == SERVICE_AUTO_RESTART || s->timeout_usec > 0) {
usec_t k;
k = s->deserialized_state == SERVICE_AUTO_RESTART ? s->restart_usec : s->timeout_usec;
if ((r = unit_watch_timer(UNIT(s), k, &s->timer_watch)) < 0)
return r;
}
}
if ((s->deserialized_state == SERVICE_START &&
(s->type == SERVICE_FORKING ||
s->type == SERVICE_DBUS ||
s->type == SERVICE_ONESHOT ||
s->type == SERVICE_NOTIFY)) ||
s->deserialized_state == SERVICE_START_POST ||
s->deserialized_state == SERVICE_RUNNING ||
s->deserialized_state == SERVICE_RELOAD ||
s->deserialized_state == SERVICE_STOP ||
s->deserialized_state == SERVICE_STOP_SIGTERM ||
s->deserialized_state == SERVICE_STOP_SIGKILL)
if (s->main_pid > 0)
if ((r = unit_watch_pid(UNIT(s), s->main_pid)) < 0)
return r;
if (s->deserialized_state == SERVICE_START_PRE ||
s->deserialized_state == SERVICE_START ||
s->deserialized_state == SERVICE_START_POST ||
s->deserialized_state == SERVICE_RELOAD ||
s->deserialized_state == SERVICE_STOP ||
s->deserialized_state == SERVICE_STOP_SIGTERM ||
s->deserialized_state == SERVICE_STOP_SIGKILL ||
s->deserialized_state == SERVICE_STOP_POST ||
s->deserialized_state == SERVICE_FINAL_SIGTERM ||
s->deserialized_state == SERVICE_FINAL_SIGKILL)
if (s->control_pid > 0)
if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0)
return r;
service_set_state(s, s->deserialized_state);
}
return 0;
}
static int service_collect_fds(Service *s, int **fds, unsigned *n_fds) {
Iterator i;
int r;
int *rfds = NULL;
unsigned rn_fds = 0;
Set *set, *free_set = NULL;
Socket *sock;
assert(s);
assert(fds);
assert(n_fds);
if (s->socket_fd >= 0)
return 0;
if (!set_isempty(s->configured_sockets))
set = s->configured_sockets;
else {
if ((r = service_get_sockets(s, &free_set)) < 0)
return r;
set = free_set;
}
SET_FOREACH(sock, set, i) {
int *cfds;
unsigned cn_fds;
if ((r = socket_collect_fds(sock, &cfds, &cn_fds)) < 0)
goto fail;
if (!cfds)
continue;
if (!rfds) {
rfds = cfds;
rn_fds = cn_fds;
} else {
int *t;
if (!(t = new(int, rn_fds+cn_fds))) {
free(cfds);
r = -ENOMEM;
goto fail;
}
memcpy(t, rfds, rn_fds * sizeof(int));
memcpy(t+rn_fds, cfds, cn_fds * sizeof(int));
free(rfds);
free(cfds);
rfds = t;
rn_fds = rn_fds+cn_fds;
}
}
*fds = rfds;
*n_fds = rn_fds;
set_free(free_set);
return 0;
fail:
set_free(set);
free(rfds);
return r;
}
static int service_spawn(
Service *s,
ExecCommand *c,
bool timeout,
bool pass_fds,
bool apply_permissions,
bool apply_chroot,
bool apply_tty_stdin,
bool set_notify_socket,
pid_t *_pid) {
pid_t pid;
int r;
int *fds = NULL, *fdsbuf = NULL;
unsigned n_fds = 0, n_env = 0;
char **argv = NULL, **final_env = NULL, **our_env = NULL;
assert(s);
assert(c);
assert(_pid);
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 {
if ((r = service_collect_fds(s, &fdsbuf, &n_fds)) < 0)
goto fail;
fds = fdsbuf;
}
}
if (timeout && s->timeout_usec) {
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
goto fail;
} else
unit_unwatch_timer(UNIT(s), &s->timer_watch);
if (!(argv = unit_full_printf_strv(UNIT(s), c->argv))) {
r = -ENOMEM;
goto fail;
}
if (!(our_env = new0(char*, 4))) {
r = -ENOMEM;
goto fail;
}
if (set_notify_socket)
if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", s->meta.manager->notify_socket) < 0) {
r = -ENOMEM;
goto fail;
}
if (s->main_pid > 0)
if (asprintf(our_env + n_env++, "MAINPID=%lu", (unsigned long) s->main_pid) < 0) {
r = -ENOMEM;
goto fail;
}
if (!(final_env = strv_env_merge(2,
s->meta.manager->environment,
our_env,
NULL))) {
r = -ENOMEM;
goto fail;
}
r = exec_spawn(c,
argv,
&s->exec_context,
fds, n_fds,
final_env,
apply_permissions,
apply_chroot,
apply_tty_stdin,
s->meta.manager->confirm_spawn,
s->meta.cgroup_bondings,
s->meta.cgroup_attributes,
&pid);
if (r < 0)
goto fail;
if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
/* FIXME: we need to do something here */
goto fail;
free(fdsbuf);
strv_free(argv);
strv_free(our_env);
strv_free(final_env);
*_pid = pid;
return 0;
fail:
free(fdsbuf);
strv_free(argv);
strv_free(our_env);
strv_free(final_env);
if (timeout)
unit_unwatch_timer(UNIT(s), &s->timer_watch);
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 lets 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)
return kill(s->main_pid, 0) >= 0 || errno != ESRCH;
/* .. 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;
}
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 ((r = cgroup_bonding_is_empty_list(s->meta.cgroup_bondings)) < 0)
return r;
return !r;
}
static void service_enter_dead(Service *s, bool success, bool allow_restart) {
int r;
assert(s);
if (!success)
s->failure = true;
if (allow_restart &&
!s->forbid_restart &&
(s->restart == SERVICE_RESTART_ALWAYS ||
(s->restart == SERVICE_RESTART_ON_SUCCESS && !s->failure) ||
(s->restart == SERVICE_RESTART_ON_FAILURE && s->failure) ||
(s->restart == SERVICE_RESTART_ON_ABORT && s->failure &&
(s->main_exec_status.code == CLD_KILLED ||
s->main_exec_status.code == CLD_DUMPED)))) {
if ((r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch)) < 0)
goto fail;
service_set_state(s, SERVICE_AUTO_RESTART);
} else
service_set_state(s, s->failure ? SERVICE_FAILED : SERVICE_DEAD);
s->forbid_restart = false;
return;
fail:
log_warning("%s failed to run install restart timer: %s", s->meta.id, strerror(-r));
service_enter_dead(s, false, false);
}
static void service_enter_signal(Service *s, ServiceState state, bool success);
static void service_enter_stop_post(Service *s, bool success) {
int r;
assert(s);
if (!success)
s->failure = true;
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST])) {
s->control_command_id = SERVICE_EXEC_STOP_POST;
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
true,
false,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_STOP_POST);
} else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, true);
return;
fail:
log_warning("%s failed to run 'stop-post' task: %s", s->meta.id, strerror(-r));
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
}
static void service_enter_signal(Service *s, ServiceState state, bool success) {
int r;
Set *pid_set = NULL;
bool wait_for_exit = false;
assert(s);
if (!success)
s->failure = true;
if (s->exec_context.kill_mode != KILL_NONE) {
int sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? s->exec_context.kill_signal : SIGKILL;
if (s->main_pid > 0) {
if (kill_and_sigcont(s->main_pid, sig) < 0 && errno != ESRCH)
log_warning("Failed to kill main process %li: %m", (long) s->main_pid);
else
wait_for_exit = !s->main_pid_alien;
}
if (s->control_pid > 0) {
if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH)
log_warning("Failed to kill control process %li: %m", (long) s->control_pid);
else
wait_for_exit = true;
}
if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) {
if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
r = -ENOMEM;
goto fail;
}
/* Exclude the main/control pids from being killed via the cgroup */
if (s->main_pid > 0)
if ((r = set_put(pid_set, LONG_TO_PTR(s->main_pid))) < 0)
goto fail;
if (s->control_pid > 0)
if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0)
goto fail;
if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
log_warning("Failed to kill control group: %s", strerror(-r));
} else if (r > 0)
wait_for_exit = true;
set_free(pid_set);
pid_set = NULL;
}
}
if (wait_for_exit) {
if (s->timeout_usec > 0)
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
goto fail;
service_set_state(s, state);
} else if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
service_enter_stop_post(s, true);
else
service_enter_dead(s, true, true);
return;
fail:
log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r));
if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
service_enter_stop_post(s, false);
else
service_enter_dead(s, false, true);
if (pid_set)
set_free(pid_set);
}
static void service_enter_stop(Service *s, bool success) {
int r;
assert(s);
if (!success)
s->failure = true;
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP])) {
s->control_command_id = SERVICE_EXEC_STOP;
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
false,
false,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_STOP);
} else
service_enter_signal(s, SERVICE_STOP_SIGTERM, true);
return;
fail:
log_warning("%s failed to run 'stop' task: %s", s->meta.id, strerror(-r));
service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
}
static void service_enter_running(Service *s, bool success) {
int main_pid_ok, cgroup_ok;
assert(s);
if (!success)
s->failure = true;
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))
service_set_state(s, SERVICE_RUNNING);
else if (s->remain_after_exit)
service_set_state(s, SERVICE_EXITED);
else
service_enter_stop(s, true);
}
static void service_enter_start_post(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST])) {
s->control_command_id = SERVICE_EXEC_START_POST;
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
false,
false,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_START_POST);
} else
service_enter_running(s, true);
return;
fail:
log_warning("%s failed to run 'start-post' task: %s", s->meta.id, strerror(-r));
service_enter_stop(s, false);
}
static void service_enter_start(Service *s) {
pid_t pid;
int r;
ExecCommand *c;
assert(s);
assert(s->exec_command[SERVICE_EXEC_START]);
assert(!s->exec_command[SERVICE_EXEC_START]->command_next || s->type == SERVICE_ONESHOT);
if (s->type == SERVICE_FORKING)
service_unwatch_control_pid(s);
else
service_unwatch_main_pid(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 ((r = service_spawn(s,
c,
s->type == SERVICE_FORKING || s->type == SERVICE_DBUS || s->type == SERVICE_NOTIFY,
true,
true,
true,
true,
s->notify_access != NOTIFY_NONE,
&pid)) < 0)
goto fail;
if (s->type == SERVICE_SIMPLE) {
/* 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_warning("%s failed to run 'start' task: %s", s->meta.id, strerror(-r));
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
}
static void service_enter_start_pre(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE])) {
s->control_command_id = SERVICE_EXEC_START_PRE;
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
true,
false,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_START_PRE);
} else
service_enter_start(s);
return;
fail:
log_warning("%s failed to run 'start-pre' task: %s", s->meta.id, strerror(-r));
service_enter_dead(s, false, true);
}
static void service_enter_restart(Service *s) {
int r;
DBusError error;
assert(s);
dbus_error_init(&error);
if (s->meta.job) {
log_info("Job pending for unit, delaying automatic restart.");
if ((r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch)) < 0)
goto fail;
}
service_enter_dead(s, true, false);
if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s), JOB_FAIL, false, &error, NULL)) < 0)
goto fail;
log_debug("%s scheduled restart job.", s->meta.id);
return;
fail:
log_warning("%s failed to schedule restart job: %s", s->meta.id, bus_error(&error, -r));
service_enter_dead(s, false, false);
dbus_error_free(&error);
}
static void service_enter_reload(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD])) {
s->control_command_id = SERVICE_EXEC_RELOAD;
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
false,
false,
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_RELOAD);
} else
service_enter_running(s, true);
return;
fail:
log_warning("%s failed to run 'reload' task: %s", s->meta.id, strerror(-r));
s->reload_failure = true;
service_enter_running(s, true);
}
static void service_run_next_control(Service *s, bool success) {
int r;
assert(s);
assert(s->control_command);
assert(s->control_command->command_next);
if (!success)
s->failure = true;
assert(s->control_command_id != SERVICE_EXEC_START);
s->control_command = s->control_command->command_next;
service_unwatch_control_pid(s);
if ((r = service_spawn(s,
s->control_command,
true,
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,
false,
&s->control_pid)) < 0)
goto fail;
return;
fail:
log_warning("%s failed to run next control task: %s", s->meta.id, strerror(-r));
if (s->state == SERVICE_START_PRE)
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
else if (s->state == SERVICE_STOP)
service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
else if (s->state == SERVICE_STOP_POST)
service_enter_dead(s, false, true);
else if (s->state == SERVICE_RELOAD) {
s->reload_failure = true;
service_enter_running(s, true);
} else
service_enter_stop(s, false);
}
static void service_run_next_main(Service *s, bool success) {
pid_t pid;
int r;
assert(s);
assert(s->main_command);
assert(s->main_command->command_next);
assert(s->type == SERVICE_ONESHOT);
if (!success)
s->failure = true;
s->main_command = s->main_command->command_next;
service_unwatch_main_pid(s);
if ((r = service_spawn(s,
s->main_command,
false,
true,
true,
true,
true,
s->notify_access != NOTIFY_NONE,
&pid)) < 0)
goto fail;
service_set_main_pid(s, pid);
return;
fail:
log_warning("%s failed to run next main task: %s", s->meta.id, strerror(-r));
service_enter_stop(s, false);
}
static int service_start(Unit *u) {
Service *s = SERVICE(u);
assert(s);
/* We cannot fulfill this request right now, try again later
* please! */
if (s->state == SERVICE_STOP ||
s->state == SERVICE_STOP_SIGTERM ||
s->state == SERVICE_STOP_SIGKILL ||
s->state == SERVICE_STOP_POST ||
s->state == SERVICE_FINAL_SIGTERM ||
s->state == SERVICE_FINAL_SIGKILL)
return -EAGAIN;
/* Already on it! */
if (s->state == SERVICE_START_PRE ||
s->state == SERVICE_START ||
s->state == SERVICE_START_POST)
return 0;
assert(s->state == SERVICE_DEAD || s->state == SERVICE_FAILED || s->state == SERVICE_AUTO_RESTART);
/* Make sure we don't enter a busy loop of some kind. */
if (!ratelimit_test(&s->ratelimit)) {
log_warning("%s start request repeated too quickly, refusing to start.", u->meta.id);
return -ECANCELED;
}
s->failure = false;
s->main_pid_known = false;
s->main_pid_alien = false;
s->forbid_restart = false;
service_enter_start_pre(s);
return 0;
}
static int service_stop(Unit *u) {
Service *s = SERVICE(u);
assert(s);
/* This is a user request, so don't do restarts on this
* shutdown. */
s->forbid_restart = true;
/* Already on it */
if (s->state == SERVICE_STOP ||
s->state == SERVICE_STOP_SIGTERM ||
s->state == SERVICE_STOP_SIGKILL ||
s->state == SERVICE_STOP_POST ||
s->state == SERVICE_FINAL_SIGTERM ||
s->state == SERVICE_FINAL_SIGKILL)
return 0;
/* Don't allow a restart */
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 (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, true);
return 0;
}
assert(s->state == SERVICE_RUNNING ||
s->state == SERVICE_EXITED);
service_enter_stop(s, true);
return 0;
}
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;
}
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);
assert(u);
assert(f);
assert(fds);
unit_serialize_item(u, f, "state", service_state_to_string(s->state));
unit_serialize_item(u, f, "failure", yes_no(s->failure));
if (s->control_pid > 0)
unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid);
if (s->main_pid_known && s->main_pid > 0)
unit_serialize_item_format(u, f, "main-pid", "%lu", (unsigned long) 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);
/* 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;
if ((copy = fdset_put_dup(fds, s->socket_fd)) < 0)
return copy;
unit_serialize_item_format(u, f, "socket-fd", "%i", copy);
}
if (s->main_exec_status.pid > 0) {
unit_serialize_item_format(u, f, "main-exec-status-pid", "%lu", (unsigned long) 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);
}
}
return 0;
}
static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
Service *s = SERVICE(u);
assert(u);
assert(key);
assert(value);
assert(fds);
if (streq(key, "state")) {
ServiceState state;
if ((state = service_state_from_string(value)) < 0)
log_debug("Failed to parse state value %s", value);
else
s->deserialized_state = state;
} else if (streq(key, "failure")) {
int b;
if ((b = parse_boolean(value)) < 0)
log_debug("Failed to parse failure value %s", value);
else
s->failure = b || s->failure;
} else if (streq(key, "control-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_debug("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_debug("Failed to parse main-pid value %s", value);
else
service_set_main_pid(s, (pid_t) pid);
} else if (streq(key, "main-pid-known")) {
int b;
if ((b = parse_boolean(value)) < 0)
log_debug("Failed to parse main-pid-known value %s", value);
else
s->main_pid_known = b;
} else if (streq(key, "status-text")) {
char *t;
if ((t = strdup(value))) {
free(s->status_text);
s->status_text = t;
}
} else if (streq(key, "control-command")) {
ServiceExecCommand id;
if ((id = service_exec_command_from_string(value)) < 0)
log_debug("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_debug("Failed to parse socket-fd value %s", value);
else {
if (s->socket_fd >= 0)
close_nointr_nofail(s->socket_fd);
s->socket_fd = fdset_remove(fds, fd);
}
} else if (streq(key, "main-exec-status-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_debug("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_debug("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_debug("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
log_debug("Unknown serialization key '%s'", key);
return 0;
}
static UnitActiveState service_active_state(Unit *u) {
assert(u);
return state_translation_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;
#ifdef HAVE_SYSV_COMPAT
if (s->sysv_path)
return true;
#endif
return false;
}
static bool service_check_snapshot(Unit *u) {
Service *s = SERVICE(u);
assert(s);
return !s->got_socket_fd;
}
static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
Service *s = SERVICE(u);
bool success;
assert(s);
assert(pid >= 0);
if (!s->meta.fragment_path)
success = is_clean_exit_lsb(code, status);
else
success = is_clean_exit(code, status);
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 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 */
if (s->main_command) {
s->main_command->exec_status = s->main_exec_status;
if (s->main_command->ignore)
success = true;
}
log_full(success ? LOG_DEBUG : LOG_NOTICE,
"%s: main process exited, code=%s, status=%i", u->meta.id, sigchld_code_to_string(code), status);
s->failure = s->failure || !success;
if (s->main_command &&
s->main_command->command_next &&
success) {
/* There is another command to *
* execute, so let's do that. */
log_debug("%s running next main command for state %s", u->meta.id, service_state_to_string(s->state));
service_run_next_main(s, success);
} 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 (success)
service_enter_start_post(s);
else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
} else {
assert(s->type == SERVICE_DBUS || s->type == SERVICE_NOTIFY);
/* Fall through */
}
case SERVICE_RUNNING:
service_enter_running(s, success);
break;
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (!control_pid_good(s))
service_enter_stop_post(s, success);
/* If there is still a control process, wait for that first */
break;
default:
assert_not_reached("Uh, main process died at wrong time.");
}
}
} else if (s->control_pid == pid) {
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)
success = true;
}
log_full(success ? LOG_DEBUG : LOG_NOTICE,
"%s: control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
s->failure = s->failure || !success;
if (s->control_command &&
s->control_command->command_next &&
success) {
/* There is another command to *
* execute, so let's do that. */
log_debug("%s running next control command for state %s", u->meta.id, service_state_to_string(s->state));
service_run_next_control(s, success);
} 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_debug("%s got final SIGCHLD for state %s", u->meta.id, service_state_to_string(s->state));
switch (s->state) {
case SERVICE_START_PRE:
if (success)
service_enter_start(s);
else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_START:
assert(s->type == SERVICE_FORKING);
/* Let's try to load the pid
* file here if we can. We
* ignore the return value,
* since the PID file might
* actually be created by a
* START_POST script */
if (success) {
service_load_pid_file(s, !s->exec_command[SERVICE_EXEC_START_POST]);
service_search_main_pid(s);
service_enter_start_post(s);
} else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_START_POST:
if (success) {
service_load_pid_file(s, true);
service_search_main_pid(s);
}
s->reload_failure = !success;
service_enter_running(s, true);
break;
case SERVICE_RELOAD:
if (success) {
service_load_pid_file(s, true);
service_search_main_pid(s);
}
s->reload_failure = !success;
service_enter_running(s, true);
break;
case SERVICE_STOP:
service_enter_signal(s, SERVICE_STOP_SIGTERM, success);
break;
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (main_pid_good(s) <= 0)
service_enter_stop_post(s, success);
/* If there is still a service
* process around, wait until
* that one quit, too */
break;
case SERVICE_STOP_POST:
case SERVICE_FINAL_SIGTERM:
case SERVICE_FINAL_SIGKILL:
service_enter_dead(s, success, true);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
}
}
/* Notify clients about changed exit status */
unit_add_to_dbus_queue(u);
}
static void service_timer_event(Unit *u, uint64_t elapsed, Watch* w) {
Service *s = SERVICE(u);
assert(s);
assert(elapsed == 1);
assert(w == &s->timer_watch);
switch (s->state) {
case SERVICE_START_PRE:
case SERVICE_START:
log_warning("%s operation timed out. Terminating.", u->meta.id);
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_START_POST:
log_warning("%s operation timed out. Stopping.", u->meta.id);
service_enter_stop(s, false);
break;
case SERVICE_RELOAD:
log_warning("%s operation timed out. Stopping.", u->meta.id);
s->reload_failure = true;
service_enter_running(s, true);
break;
case SERVICE_STOP:
log_warning("%s stopping timed out. Terminating.", u->meta.id);
service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
break;
case SERVICE_STOP_SIGTERM:
if (s->exec_context.send_sigkill) {
log_warning("%s stopping timed out. Killing.", u->meta.id);
service_enter_signal(s, SERVICE_STOP_SIGKILL, false);
} else {
log_warning("%s stopping timed out. Skipping SIGKILL.", u->meta.id);
service_enter_stop_post(s, false);
}
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_warning("%s still around after SIGKILL. Ignoring.", u->meta.id);
service_enter_stop_post(s, false);
break;
case SERVICE_STOP_POST:
log_warning("%s stopping timed out (2). Terminating.", u->meta.id);
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_FINAL_SIGTERM:
if (s->exec_context.send_sigkill) {
log_warning("%s stopping timed out (2). Killing.", u->meta.id);
service_enter_signal(s, SERVICE_FINAL_SIGKILL, false);
} else {
log_warning("%s stopping timed out (2). Skipping SIGKILL. Entering failed mode.", u->meta.id);
service_enter_dead(s, false, true);
}
break;
case SERVICE_FINAL_SIGKILL:
log_warning("%s still around after SIGKILL (2). Entering failed mode.", u->meta.id);
service_enter_dead(s, false, true);
break;
case SERVICE_AUTO_RESTART:
log_info("%s holdoff time over, scheduling restart.", u->meta.id);
service_enter_restart(s);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
}
static void service_cgroup_notify_event(Unit *u) {
Service *s = SERVICE(u);
assert(u);
log_debug("%s: cgroup is empty", u->meta.id);
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_RUNNING:
service_enter_running(s, true);
break;
case SERVICE_STOP_SIGTERM:
case SERVICE_STOP_SIGKILL:
if (main_pid_good(s) <= 0 && !control_pid_good(s))
service_enter_stop_post(s, true);
break;
case SERVICE_FINAL_SIGTERM:
case SERVICE_FINAL_SIGKILL:
if (main_pid_good(s) <= 0 && !control_pid_good(s))
service_enter_dead(s, true, true);
break;
default:
;
}
}
static void service_notify_message(Unit *u, pid_t pid, char **tags) {
Service *s = SERVICE(u);
const char *e;
assert(u);
if (s->notify_access == NOTIFY_NONE) {
log_warning("%s: Got notification message from PID %lu, but reception is disabled.",
u->meta.id, (unsigned long) pid);
return;
}
if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) {
log_warning("%s: Got notification message from PID %lu, but reception only permitted for PID %lu",
u->meta.id, (unsigned long) pid, (unsigned long) s->main_pid);
return;
}
log_debug("%s: Got message", u->meta.id);
/* Interpret MAINPID= */
if ((e = strv_find_prefix(tags, "MAINPID=")) &&
(s->state == SERVICE_START ||
s->state == SERVICE_START_POST ||
s->state == SERVICE_RUNNING ||
s->state == SERVICE_RELOAD)) {
if (parse_pid(e + 8, &pid) < 0)
log_warning("Failed to parse notification message %s", e);
else {
log_debug("%s: got %s", u->meta.id, e);
service_set_main_pid(s, pid);
}
}
/* Interpret READY= */
if (s->type == SERVICE_NOTIFY &&
s->state == SERVICE_START &&
strv_find(tags, "READY=1")) {
log_debug("%s: got READY=1", u->meta.id);
service_enter_start_post(s);
}
/* Interpret STATUS= */
if ((e = strv_find_prefix(tags, "STATUS="))) {
char *t;
if (e[7]) {
if (!(t = strdup(e+7))) {
log_error("Failed to allocate string.");
return;
}
log_debug("%s: got %s", u->meta.id, e);
free(s->status_text);
s->status_text = t;
} else {
free(s->status_text);
s->status_text = NULL;
}
}
/* Notify clients about changed status or main pid */
unit_add_to_dbus_queue(u);
}
#ifdef HAVE_SYSV_COMPAT
#ifdef TARGET_SUSE
static void sysv_facility_in_insserv_conf(Manager *mgr) {
FILE *f=NULL;
int r;
if (!(f = fopen("/etc/insserv.conf", "re"))) {
r = errno == ENOENT ? 0 : -errno;
goto finish;
}
while (!feof(f)) {
char l[LINE_MAX], *t;
char **parsed = NULL;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
r = -errno;
log_error("Failed to read configuration file '/etc/insserv.conf': %s", strerror(-r));
goto finish;
}
t = strstrip(l);
if (*t != '$' && *t != '<')
continue;
parsed = strv_split(t,WHITESPACE);
/* we ignore <interactive>, not used, equivalent to X-Interactive */
if (parsed && !startswith_no_case (parsed[0], "<interactive>")) {
char *facility;
Unit *u;
if (sysv_translate_facility(parsed[0], NULL, &facility) < 0)
continue;
if ((u = manager_get_unit(mgr, facility)) && (u->meta.type == UNIT_TARGET)) {
UnitDependency e;
char *dep = NULL, *name, **j;
STRV_FOREACH (j, parsed+1) {
if (*j[0]=='+') {
e = UNIT_WANTS;
name = *j+1;
}
else {
e = UNIT_REQUIRES;
name = *j;
}
if (sysv_translate_facility(name, NULL, &dep) < 0)
continue;
r = unit_add_two_dependencies_by_name(u, UNIT_BEFORE, e, dep, NULL, true);
free(dep);
}
}
free(facility);
}
strv_free(parsed);
}
finish:
if (f)
fclose(f);
}
#endif
static int service_enumerate(Manager *m) {
char **p;
unsigned i;
DIR *d = NULL;
char *path = NULL, *fpath = NULL, *name = NULL;
Set *runlevel_services[ELEMENTSOF(rcnd_table)], *shutdown_services = NULL;
Unit *service;
Iterator j;
int r;
assert(m);
if (m->running_as != MANAGER_SYSTEM)
return 0;
zero(runlevel_services);
STRV_FOREACH(p, m->lookup_paths.sysvrcnd_path)
for (i = 0; i < ELEMENTSOF(rcnd_table); i ++) {
struct dirent *de;
free(path);
path = join(*p, "/", rcnd_table[i].path, NULL);
if (!path) {
r = -ENOMEM;
goto finish;
}
if (d)
closedir(d);
if (!(d = opendir(path))) {
if (errno != ENOENT)
log_warning("opendir() failed on %s: %s", path, strerror(errno));
continue;
}
while ((de = readdir(d))) {
int a, b;
if (ignore_file(de->d_name))
continue;
if (de->d_name[0] != 'S' && de->d_name[0] != 'K')
continue;
if (strlen(de->d_name) < 4)
continue;
a = undecchar(de->d_name[1]);
b = undecchar(de->d_name[2]);
if (a < 0 || b < 0)
continue;
free(fpath);
fpath = join(path, "/", de->d_name, NULL);
if (!fpath) {
r = -ENOMEM;
goto finish;
}
if (access(fpath, X_OK) < 0) {
if (errno != ENOENT)
log_warning("access() failed on %s: %s", fpath, strerror(errno));
continue;
}
free(name);
if (!(name = sysv_translate_name(de->d_name + 3))) {
r = -ENOMEM;
goto finish;
}
if ((r = manager_load_unit_prepare(m, name, NULL, NULL, &service)) < 0) {
log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
continue;
}
if (de->d_name[0] == 'S') {
if (rcnd_table[i].type == RUNLEVEL_UP || rcnd_table[i].type == RUNLEVEL_SYSINIT) {
SERVICE(service)->sysv_start_priority_from_rcnd =
MAX(a*10 + b, SERVICE(service)->sysv_start_priority_from_rcnd);
SERVICE(service)->sysv_enabled = true;
}
if ((r = set_ensure_allocated(&runlevel_services[i], trivial_hash_func, trivial_compare_func)) < 0)
goto finish;
if ((r = set_put(runlevel_services[i], service)) < 0)
goto finish;
} else if (de->d_name[0] == 'K' &&
(rcnd_table[i].type == RUNLEVEL_DOWN ||
rcnd_table[i].type == RUNLEVEL_SYSINIT)) {
if ((r = set_ensure_allocated(&shutdown_services, trivial_hash_func, trivial_compare_func)) < 0)
goto finish;
if ((r = set_put(shutdown_services, service)) < 0)
goto finish;
}
}
}
/* Now we loaded all stubs and are aware of the lowest
start-up priority for all services, not let's actually load
the services, this will also tell us which services are
actually native now */
manager_dispatch_load_queue(m);
/* If this is a native service, rely on native ways to pull in
* a service, don't pull it in via sysv rcN.d links. */
for (i = 0; i < ELEMENTSOF(rcnd_table); i ++)
SET_FOREACH(service, runlevel_services[i], j) {
service = unit_follow_merge(service);
if (service->meta.fragment_path)
continue;
if ((r = unit_add_two_dependencies_by_name_inverse(service, UNIT_AFTER, UNIT_WANTS, rcnd_table[i].target, NULL, true)) < 0)
goto finish;
}
/* We honour K links only for halt/reboot. For the normal
* runlevels we assume the stop jobs will be implicitly added
* by the core logic. Also, we don't really distinguish here
* between the runlevels 0 and 6 and just add them to the
* special shutdown target. On SUSE the boot.d/ runlevel is
* also used for shutdown, so we add links for that too to the
* shutdown target.*/
SET_FOREACH(service, shutdown_services, j) {
service = unit_follow_merge(service);
if (service->meta.fragment_path)
continue;
if ((r = unit_add_two_dependencies_by_name(service, UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true)) < 0)
goto finish;
}
r = 0;
#ifdef TARGET_SUSE
sysv_facility_in_insserv_conf (m);
#endif
finish:
free(path);
free(fpath);
free(name);
for (i = 0; i < ELEMENTSOF(rcnd_table); i++)
set_free(runlevel_services[i]);
set_free(shutdown_services);
if (d)
closedir(d);
return r;
}
#endif
static void service_bus_name_owner_change(
Unit *u,
const char *name,
const char *old_owner,
const char *new_owner) {
Service *s = SERVICE(u);
assert(s);
assert(name);
assert(streq(s->bus_name, name));
assert(old_owner || new_owner);
if (old_owner && new_owner)
log_debug("%s's D-Bus name %s changed owner from %s to %s", u->meta.id, name, old_owner, new_owner);
else if (old_owner)
log_debug("%s's D-Bus name %s no longer registered by %s", u->meta.id, name, old_owner);
else
log_debug("%s's D-Bus name %s now registered by %s", u->meta.id, 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, true);
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)) {
/* Try to acquire PID from bus service */
log_debug("Trying to acquire PID from D-Bus name...");
bus_query_pid(u->meta.manager, name);
}
}
static void service_bus_query_pid_done(
Unit *u,
const char *name,
pid_t pid) {
Service *s = SERVICE(u);
assert(s);
assert(name);
log_debug("%s's D-Bus name %s is now owned by process %u", u->meta.id, name, (unsigned) pid);
if (s->main_pid <= 0 &&
(s->state == SERVICE_START ||
s->state == SERVICE_START_POST ||
s->state == SERVICE_RUNNING ||
s->state == SERVICE_RELOAD))
service_set_main_pid(s, pid);
}
int service_set_socket_fd(Service *s, int fd, Socket *sock) {
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 (s->meta.load_state != UNIT_LOADED)
return -EINVAL;
if (s->socket_fd >= 0)
return -EBUSY;
if (s->state != SERVICE_DEAD)
return -EAGAIN;
s->socket_fd = fd;
s->got_socket_fd = true;
s->accept_socket = sock;
return 0;
}
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->failure = false;
}
static bool service_need_daemon_reload(Unit *u) {
Service *s = SERVICE(u);
assert(s);
#ifdef HAVE_SYSV_COMPAT
if (s->sysv_path) {
struct stat st;
zero(st);
if (stat(s->sysv_path, &st) < 0)
/* What, cannot access this anymore? */
return true;
if (s->sysv_mtime > 0 &&
timespec_load(&st.st_mtim) != s->sysv_mtime)
return true;
}
#endif
return false;
}
static int service_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
Service *s = SERVICE(u);
int r = 0;
Set *pid_set = NULL;
assert(s);
if (s->main_pid <= 0 && who == KILL_MAIN) {
dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No main process to kill");
return -ESRCH;
}
if (s->control_pid <= 0 && who == KILL_CONTROL) {
dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
return -ESRCH;
}
if (who == KILL_CONTROL || who == KILL_ALL)
if (s->control_pid > 0)
if (kill(s->control_pid, signo) < 0)
r = -errno;
if (who == KILL_MAIN || who == KILL_ALL)
if (s->main_pid > 0)
if (kill(s->main_pid, signo) < 0)
r = -errno;
if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
int q;
if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
return -ENOMEM;
/* Exclude the control/main pid from being killed via the cgroup */
if (s->control_pid > 0)
if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) {
r = q;
goto finish;
}
if (s->main_pid > 0)
if ((q = set_put(pid_set, LONG_TO_PTR(s->main_pid))) < 0) {
r = q;
goto finish;
}
if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0)
if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
r = q;
}
finish:
if (pid_set)
set_free(pid_set);
return r;
}
static const char* const service_state_table[_SERVICE_STATE_MAX] = {
[SERVICE_DEAD] = "dead",
[SERVICE_START_PRE] = "start-pre",
[SERVICE_START] = "start",
[SERVICE_START_POST] = "start-post",
[SERVICE_RUNNING] = "running",
[SERVICE_EXITED] = "exited",
[SERVICE_RELOAD] = "reload",
[SERVICE_STOP] = "stop",
[SERVICE_STOP_SIGTERM] = "stop-sigterm",
[SERVICE_STOP_SIGKILL] = "stop-sigkill",
[SERVICE_STOP_POST] = "stop-post",
[SERVICE_FINAL_SIGTERM] = "final-sigterm",
[SERVICE_FINAL_SIGKILL] = "final-sigkill",
[SERVICE_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_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"
};
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);
const UnitVTable service_vtable = {
.suffix = ".service",
.sections =
"Unit\0"
"Service\0"
"Install\0",
.show_status = true,
.init = service_init,
.done = service_done,
.load = service_load,
.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,
.timer_event = service_timer_event,
.reset_failed = service_reset_failed,
.need_daemon_reload = service_need_daemon_reload,
.cgroup_notify_empty = service_cgroup_notify_event,
.notify_message = service_notify_message,
.bus_name_owner_change = service_bus_name_owner_change,
.bus_query_pid_done = service_bus_query_pid_done,
.bus_interface = "org.freedesktop.systemd1.Service",
.bus_message_handler = bus_service_message_handler,
.bus_invalidating_properties = bus_service_invalidating_properties,
#ifdef HAVE_SYSV_COMPAT
.enumerate = service_enumerate
#endif
};
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