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Systemd/src/service.c
Lennart Poettering a40eb73224 unit: add DefaultDependencies= setting 
In order to simplify writing of unit files introduce default
dependencies that are added to all units unless explictly disabled in a
unit. This option can be switched off for select units that are involved
in early boot-up ot late system shutdown,

This should simplify service files for most normal daemons, but breaks
existing service files for software involved in early boot (notably
udev), which need to be updated for a DefaultDependencies=no setting)
2010-07-03 19:48:33 +02:00

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88 KiB
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/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <signal.h>
#include <dirent.h>
#include <unistd.h>
#include "unit.h"
#include "service.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
#include "strv.h"
#include "unit-name.h"
#include "dbus-service.h"
#include "special.h"
#define COMMENTS "#;\n"
#define NEWLINES "\n\r"
#define LINE_MAX 4096
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 */
{ "rc0.d", SPECIAL_POWEROFF_TARGET, RUNLEVEL_DOWN },
{ "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 },
{ "rc6.d", SPECIAL_REBOOT_TARGET, RUNLEVEL_DOWN },
/* SUSE style boot.d */
{ "boot.d", SPECIAL_SYSINIT_TARGET, RUNLEVEL_SYSINIT },
/* Debian style rcS.d */
{ "rcS.d", SPECIAL_SYSINIT_TARGET, RUNLEVEL_SYSINIT },
};
#define RUNLEVELS_UP "12345"
/* #define RUNLEVELS_DOWN "06" */
/* #define RUNLEVELS_BOOT "bBsS" */
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_MAINTENANCE] = UNIT_MAINTENANCE,
[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;
s->sysv_start_priority = -1;
s->socket_fd = -1;
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;
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 = pid;
s->main_pid_known = true;
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->socket)
return;
socket_connection_unref(s->socket);
s->socket = NULL;
}
static void service_done(Unit *u) {
Service *s = SERVICE(u);
assert(s);
free(s->pid_file);
s->pid_file = NULL;
free(s->sysv_path);
s->sysv_path = NULL;
free(s->sysv_runlevels);
s->sysv_runlevels = NULL;
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;
/* 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);
unit_unwatch_timer(u, &s->timer_watch);
}
static char *sysv_translate_name(const char *name) {
char *r;
if (!(r = new(char, strlen(name) + sizeof(".service"))))
return NULL;
if (startswith(name, "boot."))
/* Drop SuSE-style boot. prefix */
strcpy(stpcpy(r, name + 5), ".service");
else if (endswith(name, ".sh"))
/* Drop Debian-style .sh suffix */
strcpy(stpcpy(r, name) - 3, ".service");
else
/* Normal init scripts */
strcpy(stpcpy(r, name), ".service");
return r;
}
static int sysv_translate_facility(const char *name, char **_r) {
static const char * const table[] = {
/* LSB defined facilities */
"$local_fs", SPECIAL_LOCAL_FS_TARGET,
"$network", SPECIAL_NETWORK_TARGET,
"$named", SPECIAL_NSS_LOOKUP_TARGET,
"$portmap", SPECIAL_RPCBIND_TARGET,
"$remote_fs", SPECIAL_REMOTE_FS_TARGET,
"$syslog", SPECIAL_SYSLOG_TARGET,
"$time", SPECIAL_RTC_SET_TARGET,
/* Debian extensions */
"$mail-transport-agent", SPECIAL_MAIL_TRANSFER_AGENT_TARGET,
"$mail-transfer-agent", SPECIAL_MAIL_TRANSFER_AGENT_TARGET,
"$x-display-manager", SPECIAL_DISPLAY_MANAGER_SERVICE
};
unsigned i;
char *r;
for (i = 0; i < ELEMENTSOF(table); i += 2)
if (streq(table[i], name)) {
if (!(r = strdup(table[i+1])))
return -ENOMEM;
goto finish;
}
if (*name == '$')
return 0;
if (!(r = sysv_translate_name(name)))
return -ENOMEM;
finish:
if (_r)
*_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_per_type, other, s->meta.manager->units_per_type[UNIT_SERVICE]) {
Service *t;
UnitDependency d;
t = (Service*) other;
if (s == t)
continue;
if (t->sysv_start_priority < 0)
continue;
/* If both units have modern headers we don't care
* about the priorities */
if ((!s->sysv_path || s->sysv_has_lsb) &&
(!t->sysv_path || t->sysv_has_lsb))
continue;
if (t->sysv_start_priority < s->sysv_start_priority)
d = UNIT_AFTER;
else if (t->sysv_start_priority > s->sysv_start_priority)
d = UNIT_BEFORE;
else
continue;
/* FIXME: Maybe we should compare the name here lexicographically? */
if (!(r = unit_add_dependency(UNIT(s), d, UNIT(t), 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;
assert(s);
assert(path);
u = UNIT(s);
if (!(f = fopen(path, "re"))) {
r = errno == ENOENT ? 0 : -errno;
goto finish;
}
free(s->sysv_path);
if (!(s->sysv_path = strdup(path))) {
r = -ENOMEM;
goto finish;
}
while (!feof(f)) {
char l[LINE_MAX], *t;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
r = -errno;
log_error("Failed to read configuration file '%s': %s", path, strerror(-r));
goto finish;
}
line++;
t = strstrip(l);
if (*t != '#')
continue;
if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) {
state = LSB;
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 if (s->sysv_start_priority < 0)
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;
if (t[k-1] == '\\') {
state = DESCRIPTION;
t[k-1] = 0;
}
if (!(d = strdup(strstrip(t+12)))) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else if (startswith_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 *d;
if (t[k-1] == '\\')
t[k-1] = 0;
else
state = NORMAL;
assert(u->meta.description);
if (asprintf(&d, "%s %s", u->meta.description, strstrip(t)) < 0) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else if (state == LSB || state == LSB_DESCRIPTION) {
if (startswith_no_case(t, "Provides:")) {
char *i, *w;
size_t z;
state = LSB;
FOREACH_WORD(w, z, t+9, i) {
char *n, *m;
if (!(n = strndup(w, z))) {
r = -ENOMEM;
goto finish;
}
r = sysv_translate_facility(n, &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
r = unit_add_two_dependencies_by_name_inverse(u, UNIT_AFTER, UNIT_REQUIRES, m, NULL, true);
free(m);
if (r < 0)
goto finish;
}
} 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(w, z, strchr(t, ':')+1, i) {
char *n, *m;
if (!(n = strndup(w, z))) {
r = -ENOMEM;
goto finish;
}
r = sysv_translate_facility(n, &m);
free(n);
if (r < 0)
goto finish;
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);
free(m);
if (r < 0)
goto finish;
}
} 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;
state = LSB_DESCRIPTION;
if (!(d = strdup(strstrip(t+12)))) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else if (startswith_no_case(t, "Short-Description:") &&
!u->meta.description) {
char *d;
/* We use the short description only
* if no long description is set. */
state = LSB;
if (!(d = strdup(strstrip(t+18)))) {
r = -ENOMEM;
goto finish;
}
u->meta.description = d;
} else if (startswith_no_case(t, "X-Interactive:")) {
int b;
if ((b = parse_boolean(strstrip(t+14))) < 0) {
log_warning("[%s:%u] Couldn't parse interactive flag. Ignoring.", path, line);
continue;
}
if (b)
s->exec_context.std_input = EXEC_INPUT_TTY;
else
s->exec_context.std_input = EXEC_INPUT_NULL;
} else if (state == LSB_DESCRIPTION) {
if (startswith(l, "#\t") || startswith(l, "# ")) {
char *d;
assert(u->meta.description);
if (asprintf(&d, "%s %s", u->meta.description, t) < 0) {
r = -ENOMEM;
goto finish;
}
free(u->meta.description);
u->meta.description = d;
} else
state = LSB;
}
}
}
if ((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;
}
/* Special setting for all SysV services */
s->type = SERVICE_FORKING;
s->valid_no_process = true;
s->kill_mode = KILL_PROCESS_GROUP;
s->restart = SERVICE_ONCE;
u->meta.load_state = UNIT_LOADED;
r = 0;
finish:
if (f)
fclose(f);
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. or .sh
* prefixes/suffixes. */
if (startswith(name, "boot.") ||
endswith(name, ".sh.service"))
return -ENOENT;
STRV_FOREACH(p, s->meta.manager->lookup_paths.sysvinit_path) {
char *path;
int r;
if (asprintf(&path, "%s/%s", *p, name) < 0)
return -ENOMEM;
assert(endswith(path, ".service"));
path[strlen(path)-8] = 0;
r = service_load_sysv_path(s, path);
if (r >= 0 && s->meta.load_state == UNIT_STUB) {
/* Try Debian style xxx.sh source'able init scripts */
strcat(path, ".sh");
r = service_load_sysv_path(s, path);
}
free(path);
if (r >= 0 && s->meta.load_state == UNIT_STUB) {
/* Try SUSE style boot.xxx init scripts */
if (asprintf(&path, "%s/boot.%s", *p, name) < 0)
return -ENOMEM;
path[strlen(path)-8] = 0;
r = service_load_sysv_path(s, path);
free(path);
}
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;
}
static int service_add_bus_name(Service *s) {
char *n;
int r;
assert(s);
assert(s->bus_name);
if (asprintf(&n, "dbus-%s.service", s->bus_name) < 0)
return 0;
r = unit_merge_by_name(UNIT(s), n);
free(n);
return r;
}
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->exec_command[SERVICE_EXEC_START]->command_next) {
log_error("%s has more than one ExecStart setting. 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->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_SESSION) {
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 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;
/* 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;
/* 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) {
if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
return r;
if ((r = unit_add_default_cgroup(u)) < 0)
return r;
if ((r = sysv_fix_order(s)) < 0)
return r;
if (s->bus_name) {
if ((r = service_add_bus_name(s)) < 0)
return r;
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_TARGET, 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"
"%sValidNoProcess: %s\n"
"%sKillMode: %s\n"
"%sType: %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->valid_no_process),
prefix, kill_mode_to_string(s->kill_mode),
prefix, service_type_to_string(s->type),
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",
prefix, (unsigned long) s->main_pid);
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);
}
if (s->sysv_path)
fprintf(f,
"%sSysV Init Script Path: %s\n"
"%sSysV Init Script has LSB Header: %s\n",
prefix, s->sysv_path,
prefix, yes_no(s->sysv_has_lsb));
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);
if (s->status_text)
fprintf(f, "%sStatus Text: %s\n",
prefix, s->status_text);
free(p2);
}
static int service_load_pid_file(Service *s) {
char *k;
int r;
pid_t pid;
assert(s);
if (s->main_pid_known)
return 0;
assert(s->main_pid <= 0);
if (!s->pid_file)
return -ENOENT;
if ((r = read_one_line_file(s->pid_file, &k)) < 0)
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 ((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;
/* 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;
Socket *sock;
int r;
assert(s);
if (s->socket_fd >= 0)
return 0;
/* Notifies all our sockets when we die */
if ((r = service_get_sockets(s, &set)) < 0)
return r;
SET_FOREACH(sock, set, i)
socket_notify_service_dead(sock);
set_free(set);
return 0;
}
static void service_set_state(Service *s, ServiceState state) {
ServiceState old_state;
assert(s);
old_state = s->state;
s->state = state;
if (state != SERVICE_START_PRE &&
state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL &&
state != SERVICE_STOP_POST &&
state != SERVICE_FINAL_SIGTERM &&
state != SERVICE_FINAL_SIGKILL &&
state != SERVICE_AUTO_RESTART)
unit_unwatch_timer(UNIT(s), &s->timer_watch);
if (state != SERVICE_START &&
state != SERVICE_START_POST &&
state != SERVICE_RUNNING &&
state != SERVICE_RELOAD &&
state != SERVICE_STOP &&
state != SERVICE_STOP_SIGTERM &&
state != SERVICE_STOP_SIGKILL)
service_unwatch_main_pid(s);
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_MAINTENANCE ||
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);
}
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]);
}
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_FINISH ||
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;
Socket *sock;
assert(s);
assert(fds);
assert(n_fds);
if (s->socket_fd >= 0)
return 0;
if ((r = service_get_sockets(s, &set)) < 0)
return r;
SET_FOREACH(sock, set, i) {
int *cfds;
unsigned cn_fds;
if ((r = socket_collect_fds(sock, &cfds, &cn_fds)) < 0)
goto fail;
if (!cfds)
continue;
if (!rfds) {
rfds = cfds;
rn_fds = cn_fds;
} else {
int *t;
if (!(t = new(int, rn_fds+cn_fds))) {
free(cfds);
r = -ENOMEM;
goto fail;
}
memcpy(t, rfds, rn_fds);
memcpy(t+rn_fds, cfds, cn_fds);
free(rfds);
free(cfds);
rfds = t;
rn_fds = rn_fds+cn_fds;
}
}
*fds = rfds;
*n_fds = rn_fds;
set_free(set);
return 0;
fail:
set_free(set);
free(rfds);
return r;
}
static int service_spawn(
Service *s,
ExecCommand *c,
bool timeout,
bool pass_fds,
bool apply_permissions,
bool apply_chroot,
bool set_notify_socket,
pid_t *_pid) {
pid_t pid;
int r;
int *fds = NULL, *fdsbuf = NULL;
unsigned n_fds = 0;
char **argv = NULL, **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 (set_notify_socket) {
char *t;
if (asprintf(&t, "NOTIFY_SOCKET=@%s", s->meta.manager->notify_socket) < 0) {
r = -ENOMEM;
goto fail;
}
env = strv_env_set(s->meta.manager->environment, t);
free(t);
if (!env) {
r = -ENOMEM;
goto fail;
}
} else
env = s->meta.manager->environment;
r = exec_spawn(c,
argv,
&s->exec_context,
fds, n_fds,
env,
apply_permissions,
apply_chroot,
s->meta.manager->confirm_spawn,
s->meta.cgroup_bondings,
&pid);
strv_free(argv);
argv = NULL;
if (set_notify_socket)
strv_free(env);
env = NULL;
if (r < 0)
goto fail;
if (fdsbuf)
free(fdsbuf);
if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
/* FIXME: we need to do something here */
goto fail;
*_pid = pid;
return 0;
fail:
free(fds);
strv_free(argv);
if (set_notify_socket)
strv_free(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)
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->allow_restart &&
(s->restart == SERVICE_RESTART_ALWAYS ||
(s->restart == SERVICE_RESTART_ON_SUCCESS && !s->failure))) {
if ((r = unit_watch_timer(UNIT(s), s->restart_usec, &s->timer_watch)) < 0)
goto fail;
service_set_state(s, SERVICE_AUTO_RESTART);
} else
service_set_state(s, s->failure ? SERVICE_MAINTENANCE : SERVICE_DEAD);
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);
s->control_command_id = SERVICE_EXEC_STOP_POST;
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST])) {
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
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;
bool sent = false;
assert(s);
if (!success)
s->failure = true;
if (s->kill_mode != KILL_NONE) {
int sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
if (s->kill_mode == KILL_CONTROL_GROUP) {
if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig)) < 0) {
if (r != -EAGAIN && r != -ESRCH)
goto fail;
} else
sent = true;
}
if (!sent) {
r = 0;
if (s->main_pid > 0) {
if (kill(s->kill_mode == KILL_PROCESS ? s->main_pid : -s->main_pid, sig) < 0 && errno != ESRCH)
r = -errno;
else
sent = true;
}
if (s->control_pid > 0) {
if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH)
r = -errno;
else
sent = true;
}
if (r < 0)
goto fail;
}
}
if (sent && (s->main_pid > 0 || s->control_pid > 0)) {
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);
}
static void service_enter_stop(Service *s, bool success) {
int r;
assert(s);
if (!success)
s->failure = true;
service_unwatch_control_pid(s);
s->control_command_id = SERVICE_EXEC_STOP;
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP])) {
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
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->valid_no_process)
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);
s->control_command_id = SERVICE_EXEC_START_POST;
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST])) {
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
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;
assert(s);
assert(s->exec_command[SERVICE_EXEC_START]);
assert(!s->exec_command[SERVICE_EXEC_START]->command_next);
if (s->type == SERVICE_FORKING)
service_unwatch_control_pid(s);
else
service_unwatch_main_pid(s);
if ((r = service_spawn(s,
s->exec_command[SERVICE_EXEC_START],
s->type == SERVICE_FORKING || s->type == SERVICE_DBUS || s->type == SERVICE_NOTIFY,
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_command_id = SERVICE_EXEC_START;
s->control_command = s->exec_command[SERVICE_EXEC_START];
s->control_pid = pid;
service_set_state(s, SERVICE_START);
} else if (s->type == SERVICE_FINISH ||
s->type == SERVICE_DBUS ||
s->type == SERVICE_NOTIFY) {
/* For finishing 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);
s->control_command_id = SERVICE_EXEC_START_PRE;
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE])) {
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
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;
assert(s);
service_enter_dead(s, true, false);
if ((r = manager_add_job(s->meta.manager, JOB_START, UNIT(s), JOB_FAIL, false, 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, strerror(-r));
service_enter_dead(s, false, false);
}
static void service_enter_reload(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
s->control_command_id = SERVICE_EXEC_RELOAD;
if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD])) {
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
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));
service_enter_stop(s, false);
}
static void service_run_next(Service *s, bool success) {
int r;
assert(s);
assert(s->control_command);
assert(s->control_command->command_next);
if (!success)
s->failure = true;
s->control_command = s->control_command->command_next;
service_unwatch_control_pid(s);
if ((r = service_spawn(s,
s->control_command,
true,
false,
!s->permissions_start_only,
!s->root_directory_start_only,
false,
&s->control_pid)) < 0)
goto fail;
return;
fail:
log_warning("%s failed to run next 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
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_MAINTENANCE || 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->allow_restart = true;
service_enter_start_pre(s);
return 0;
}
static int service_stop(Unit *u) {
Service *s = SERVICE(u);
assert(s);
/* Cannot do this now */
if (s->state == SERVICE_START_PRE ||
s->state == SERVICE_START ||
s->state == SERVICE_START_POST ||
s->state == SERVICE_RELOAD)
return -EAGAIN;
/* 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;
if (s->state == SERVICE_AUTO_RESTART) {
service_set_state(s, SERVICE_DEAD);
return 0;
}
assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
/* This is a user request, so don't do restarts on this
* shutdown. */
s->allow_restart = false;
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));
/* 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);
}
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;
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 ((r = 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 ((r = 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, "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
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);
return !!s->sysv_path;
}
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);
success = is_clean_exit(code, status);
s->failure = s->failure || !success;
if (s->main_pid == pid) {
exec_status_fill(&s->main_exec_status, pid, code, status);
s->main_pid = 0;
if (s->type != SERVICE_FORKING) {
assert(s->exec_command[SERVICE_EXEC_START]);
s->exec_command[SERVICE_EXEC_START]->exec_status = s->main_exec_status;
}
log_debug("%s: main process exited, code=%s, status=%i", u->meta.id, sigchld_code_to_string(code), status);
/* The service exited, so the service is officially
* gone. */
switch (s->state) {
case SERVICE_START_POST:
case SERVICE_RELOAD:
case SERVICE_STOP:
/* Need to wait until the operation is
* done */
break;
case SERVICE_START:
if (s->type == SERVICE_FINISH) {
/* 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) {
if (s->control_command)
exec_status_fill(&s->control_command->exec_status, pid, code, status);
s->control_pid = 0;
log_debug("%s: control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
/* If we are shutting things down anyway we
* don't care about failing commands. */
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 command for state %s", u->meta.id, service_state_to_string(s->state));
service_run_next(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) {
if (s->pid_file)
service_load_pid_file(s);
service_enter_start_post(s);
} else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_START_POST:
if (success && s->pid_file && !s->main_pid_known) {
int r;
/* Hmm, let's see if we can
* load the pid now after the
* start-post scripts got
* executed. */
if ((r = service_load_pid_file(s)) < 0)
log_warning("%s: failed to load PID file %s: %s", s->meta.id, s->pid_file, strerror(-r));
}
/* Fall through */
case SERVICE_RELOAD:
if (success)
service_enter_running(s, true);
else
service_enter_stop(s, false);
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.");
}
}
}
}
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:
case SERVICE_RELOAD:
log_warning("%s operation timed out. Stopping.", u->meta.id);
service_enter_stop(s, false);
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:
log_warning("%s stopping timed out. Killing.", u->meta.id);
service_enter_signal(s, SERVICE_STOP_SIGKILL, false);
break;
case SERVICE_STOP_SIGKILL:
/* Uh, wie sent a SIGKILL and it is still not gone?
* Must be something we cannot kill, so let's just be
* weirded out and continue */
log_warning("%s still around after SIGKILL. Ignoring.", 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:
log_warning("%s stopping timed out (2). Killing.", u->meta.id);
service_enter_signal(s, SERVICE_FINAL_SIGKILL, false);
break;
case SERVICE_FINAL_SIGKILL:
log_warning("%s still around after SIGKILL (2). Entering maintenance mode.", u->meta.id);
service_enter_dead(s, false, true);
break;
case SERVICE_AUTO_RESTART:
log_debug("%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;
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 %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 (!(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;
}
}
static int service_enumerate(Manager *m) {
char **p;
unsigned i;
DIR *d = NULL;
char *path = NULL, *fpath = NULL, *name = NULL;
int r;
assert(m);
STRV_FOREACH(p, m->lookup_paths.sysvrcnd_path)
for (i = 0; i < ELEMENTSOF(rcnd_table); i ++) {
struct dirent *de;
free(path);
path = NULL;
if (asprintf(&path, "%s/%s", *p, rcnd_table[i].path) < 0) {
r = -ENOMEM;
goto finish;
}
if (d)
closedir(d);
if (!(d = opendir(path))) {
if (errno != ENOENT)
log_warning("opendir() failed on %s: %s", path, strerror(errno));
continue;
}
while ((de = readdir(d))) {
Unit *service;
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 = NULL;
if (asprintf(&fpath, "%s/%s/%s", *p, rcnd_table[i].path, de->d_name) < 0) {
r = -ENOMEM;
goto finish;
}
if (access(fpath, X_OK) < 0) {
if (errno != ENOENT)
log_warning("access() failed on %s: %s", fpath, strerror(errno));
continue;
}
free(name);
if (!(name = sysv_translate_name(de->d_name + 3))) {
r = -ENOMEM;
goto finish;
}
if ((r = manager_load_unit_prepare(m, name, NULL, &service)) < 0) {
log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
continue;
}
if (de->d_name[0] == 'S' &&
(rcnd_table[i].type == RUNLEVEL_UP || rcnd_table[i].type == RUNLEVEL_SYSINIT))
SERVICE(service)->sysv_start_priority =
MAX(a*10 + b, SERVICE(service)->sysv_start_priority);
manager_dispatch_load_queue(m);
service = unit_follow_merge(service);
if (de->d_name[0] == 'S') {
if ((r = unit_add_two_dependencies_by_name_inverse(service, UNIT_AFTER, UNIT_WANTS, rcnd_table[i].target, NULL, true)) < 0)
goto finish;
} else if (de->d_name[0] == 'K' &&
(rcnd_table[i].type == RUNLEVEL_DOWN ||
rcnd_table[i].type == RUNLEVEL_SYSINIT)) {
/* 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 distuingish 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.*/
if ((r = unit_add_two_dependencies_by_name_inverse(service, UNIT_AFTER, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true)) < 0)
goto finish;
}
}
}
r = 0;
finish:
free(path);
free(fpath);
free(name);
if (d)
closedir(d);
return r;
}
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->socket = sock;
return 0;
}
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_MAINTENANCE] = "maintenance",
[SERVICE_AUTO_RESTART] = "auto-restart",
};
DEFINE_STRING_TABLE_LOOKUP(service_state, ServiceState);
static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
[SERVICE_ONCE] = "once",
[SERVICE_RESTART_ON_SUCCESS] = "restart-on-success",
[SERVICE_RESTART_ALWAYS] = "restart-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_FINISH] = "finish",
[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",
.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,
.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,
.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_message_handler = bus_service_message_handler,
.enumerate = service_enumerate
};
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