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service: make main pid guessing optional, and reread pid file after reloads

This commit is contained in:
Lennart Poettering 2011-02-13 18:51:30 +01:00
parent e9fbc77c8f
commit 3185a36b05
6 changed files with 47 additions and 12 deletions
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6
TODO
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@ -9,6 +9,8 @@ Bugs:
Features:
* Maybe store in unit files whether a service should be enabled by default on package installation
* perhaps add "systemctl reenable" as combination of "systemctl disable" and "systemctl enable"
* need a way to apply mount options of api vfs from systemd unit files instead of fstab
@ -23,12 +25,8 @@ Features:
* gnome-shell python script/glxinfo/is-accelerated wech
* PID heuristik bei Type=forking ausmachbar machen
* maybe introduce ExecRestartPre=
* reload PID file after reload, allow dynamically changing main PIDs
* figure out what happened to bluez patch
* introduce StandardOutput=syslog+console and StandardOutput=kmsg+console to support fsck output at boot

24
man/systemd.service.xml
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@ -215,6 +215,30 @@
</listitem>
</varlistentry>
<varlistentry>
<term><varname>GuessMainPID=</varname></term>
<listitem><para>Takes a boolean value
that specifies whether systemd should
try to guess the main PID of a service
should if it cannot be determined
reliably. This option is ignored
unless <option>Type=forking</option>
is set and <option>PIDFile=</option>
is unset because for the other types
or with an explicitly configured PID
file the main PID is always known. The
guessing algorithm might come to
incorrect conclusions if a daemon
consists of more than one process. If
the main PID cannot be determined
failure detection and automatic
restarting of a service will not work
reliably. Defaults to
<option>yes</option>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>PIDFile=</varname></term>

5
src/dbus-service.c
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@ -127,8 +127,9 @@ DBusHandlerResult bus_service_message_handler(Unit *u, DBusConnection *connectio
BUS_EXEC_CONTEXT_PROPERTIES("org.freedesktop.systemd1.Service", u->service.exec_context),
{ "org.freedesktop.systemd1.Service", "PermissionsStartOnly", bus_property_append_bool, "b", &u->service.permissions_start_only },
{ "org.freedesktop.systemd1.Service", "RootDirectoryStartOnly", bus_property_append_bool, "b", &u->service.root_directory_start_only },
{ "org.freedesktop.systemd1.Service", "RemainAfterExit", bus_property_append_bool, "b", &u->service.remain_after_exit },
BUS_EXEC_STATUS_PROPERTIES("org.freedesktop.systemd1.Service", u->service.main_exec_status, "ExecMain"),
{ "org.freedesktop.systemd1.Service", "RemainAfterExit", bus_property_append_bool, "b", &u->service.remain_after_exit },
{ "org.freedesktop.systemd1.Service", "GuessMainPID", bus_property_append_bool, "b", &u->service.guess_main_pid },
BUS_EXEC_STATUS_PROPERTIES("org.freedesktop.systemd1.Service", u->service.main_exec_status, "ExecMain"),
{ "org.freedesktop.systemd1.Service", "MainPID", bus_property_append_pid, "u", &u->service.main_pid },
{ "org.freedesktop.systemd1.Service", "ControlPID", bus_property_append_pid, "u", &u->service.control_pid },
#ifdef HAVE_SYSV_COMPAT

1
src/load-fragment.c
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@ -1854,6 +1854,7 @@ static int load_from_path(Unit *u, const char *path) {
{ "PermissionsStartOnly", config_parse_bool, &u->service.permissions_start_only, "Service" },
{ "RootDirectoryStartOnly", config_parse_bool, &u->service.root_directory_start_only, "Service" },
{ "RemainAfterExit", config_parse_bool, &u->service.remain_after_exit, "Service" },
{ "GuessMainPID", config_parse_bool, &u->service.guess_main_pid, "Service" },
#ifdef HAVE_SYSV_COMPAT
{ "SysVStartPriority", config_parse_sysv_priority, &u->service.sysv_start_priority, "Service" },
#else

22
src/service.c
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@ -118,6 +118,7 @@ static void service_init(Unit *u) {
s->sysv_start_priority = -1;
#endif
s->socket_fd = -1;
s->guess_main_pid = true;
exec_context_init(&s->exec_context);
@ -1151,6 +1152,7 @@ static void service_dump(Unit *u, FILE *f, const char *prefix) {
"%sPermissionsStartOnly: %s\n"
"%sRootDirectoryStartOnly: %s\n"
"%sRemainAfterExit: %s\n"
"%sGuessMainPID: %s\n"
"%sType: %s\n"
"%sRestart: %s\n"
"%sNotifyAccess: %s\n",
@ -1158,6 +1160,7 @@ static void service_dump(Unit *u, FILE *f, const char *prefix) {
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));
@ -1236,11 +1239,6 @@ static int service_load_pid_file(Service *s) {
assert(s);
if (s->main_pid_known)
return 0;
assert(s->main_pid <= 0);
if (!s->pid_file)
return -ENOENT;
@ -1275,9 +1273,14 @@ static int service_search_main_pid(Service *s) {
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)
@ -2674,9 +2677,16 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
log_warning("%s: failed to load PID file %s: %s", s->meta.id, s->pid_file, strerror(-r));
}
/* Fall through */
s->reload_failure = !success;
service_enter_running(s, true);
break;
case SERVICE_RELOAD:
if (success) {
service_load_pid_file(s);
service_search_main_pid(s);
}
s->reload_failure = !success;
service_enter_running(s, true);
break;

1
src/service.h
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@ -125,6 +125,7 @@ struct Service {
bool permissions_start_only;
bool root_directory_start_only;
bool remain_after_exit;
bool guess_main_pid;
/* If we shut down, remember why */
bool failure:1;