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authorLennart Poettering <lennart@poettering.net>2014-01-31 17:45:13 +0100
committerLennart Poettering <lennart@poettering.net>2014-01-31 17:48:36 +0100
commit2d4a39e759c4ab846ad8a546abeddd40bc8d736e (patch)
tree6076c82b7c28bc2f80570b72427cc27a2ed28357
parentfb818b2ea194ec182aa3e776d38883dc615910a1 (diff)
core: introduce new stop protocol for unit scopes
By specifiy a Controller property when creating the scope a client can specify a bus name that will be notified with a RequestStop bus signal when the scope has been asked to shut down, instead of sending SIGTERM to the scope processes themselves. https://bugzilla.redhat.com/show_bug.cgi?id=1032695
-rw-r--r--src/core/dbus-scope.c55
-rw-r--r--src/core/dbus-scope.h2
-rw-r--r--src/core/scope.c26
-rw-r--r--src/core/scope.h2
-rw-r--r--src/run/run.c8
5 files changed, 86 insertions, 7 deletions
diff --git a/src/core/dbus-scope.c b/src/core/dbus-scope.c
index bb251edc76..d5a2048516 100644
--- a/src/core/dbus-scope.c
+++ b/src/core/dbus-scope.c
@@ -26,13 +26,16 @@
#include "dbus-kill.h"
#include "dbus-scope.h"
#include "bus-util.h"
+#include "bus-internal.h"
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, scope_result, ScopeResult);
const sd_bus_vtable bus_scope_vtable[] = {
SD_BUS_VTABLE_START(0),
+ SD_BUS_PROPERTY("Controller", "s", NULL, offsetof(Scope, controller), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("TimeoutStopUSec", "t", bus_property_get_usec, offsetof(Scope, timeout_stop_usec), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Scope, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+ SD_BUS_SIGNAL("RequestStop", NULL, 0),
SD_BUS_VTABLE_END
};
@@ -86,6 +89,32 @@ static int bus_scope_set_transient_property(
return 1;
+ } else if (streq(name, "Controller")) {
+ const char *controller;
+ char *c;
+
+ r = sd_bus_message_read(message, "s", &controller);
+ if (r < 0)
+ return r;
+
+ if (!isempty(controller) && !service_name_is_valid(controller))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Controller '%s' is not a valid bus name.", controller);
+
+ if (mode != UNIT_CHECK) {
+ if (isempty(controller))
+ c = NULL;
+ else {
+ c = strdup(controller);
+ if (!c)
+ return -ENOMEM;
+ }
+
+ free(s->controller);
+ s->controller = c;
+ }
+
+ return 1;
+
} else if (streq(name, "TimeoutStopUSec")) {
if (mode != UNIT_CHECK) {
@@ -145,3 +174,29 @@ int bus_scope_commit_properties(Unit *u) {
unit_realize_cgroup(u);
return 0;
}
+
+int bus_scope_send_request_stop(Scope *s) {
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ assert(s);
+
+ if (!s->controller)
+ return 0;
+
+ p = unit_dbus_path(UNIT(s));
+ if (!p)
+ return -ENOMEM;
+
+ r = sd_bus_message_new_signal(
+ UNIT(s)->manager->api_bus,
+ p,
+ "org.freedesktop.systemd1.Scope",
+ "RequestStop",
+ &m);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send_to(UNIT(s)->manager->api_bus, m, /* s->controller */ NULL, NULL);
+}
diff --git a/src/core/dbus-scope.h b/src/core/dbus-scope.h
index 7e8f0053da..33beda47b7 100644
--- a/src/core/dbus-scope.h
+++ b/src/core/dbus-scope.h
@@ -28,3 +28,5 @@ extern const sd_bus_vtable bus_scope_vtable[];
int bus_scope_set_property(Unit *u, const char *name, sd_bus_message *i, UnitSetPropertiesMode mode, sd_bus_error *error);
int bus_scope_commit_properties(Unit *u);
+
+int bus_scope_send_request_stop(Scope *s);
diff --git a/src/core/scope.c b/src/core/scope.c
index 5beb4f80c4..0c1d17e68c 100644
--- a/src/core/scope.c
+++ b/src/core/scope.c
@@ -64,6 +64,8 @@ static void scope_done(Unit *u) {
cgroup_context_done(&s->cgroup_context);
+ free(s->controller);
+
set_free(s->pids);
s->pids = NULL;
@@ -217,6 +219,7 @@ static void scope_enter_dead(Scope *s, ScopeResult f) {
}
static void scope_enter_signal(Scope *s, ScopeState state, ScopeResult f) {
+ bool skip_signal = false;
int r;
assert(s);
@@ -224,13 +227,22 @@ static void scope_enter_signal(Scope *s, ScopeState state, ScopeResult f) {
if (f != SCOPE_SUCCESS)
s->result = f;
- r = unit_kill_context(
- UNIT(s),
- &s->kill_context,
- state != SCOPE_STOP_SIGTERM,
- -1, -1, false);
- if (r < 0)
- goto fail;
+ /* If we have a controller set let's ask the controller nicely
+ * to terminate the scope, instead of us going directly into
+ * SIGTERM beserk mode */
+ if (state == SCOPE_STOP_SIGTERM)
+ skip_signal = bus_scope_send_request_stop(s) > 0;
+
+ if (!skip_signal) {
+ r = unit_kill_context(
+ UNIT(s),
+ &s->kill_context,
+ state != SCOPE_STOP_SIGTERM,
+ -1, -1, false);
+ if (r < 0)
+ goto fail;
+ } else
+ r = 1;
if (r > 0) {
r = scope_arm_timer(s);
diff --git a/src/core/scope.h b/src/core/scope.h
index 4d8a1714bc..014b50c765 100644
--- a/src/core/scope.h
+++ b/src/core/scope.h
@@ -55,6 +55,8 @@ struct Scope {
usec_t timeout_stop_usec;
+ char *controller;
+
Set *pids;
sd_event_source *timer_event_source;
diff --git a/src/run/run.c b/src/run/run.c
index 1b14e40e4d..b9e1700d33 100644
--- a/src/run/run.c
+++ b/src/run/run.c
@@ -356,6 +356,14 @@ static int start_transient_scope(
if (r < 0)
return r;
+ {
+ const char *unique_id;
+ sd_bus_get_unique_name(bus, &unique_id);
+ r = sd_bus_message_append(m, "(sv)", "Controller", "s", unique_id);
+ if (r < 0)
+ return r;
+ }
+
r = message_start_transient_unit_send(bus, m, error, NULL);
if (r < 0)
return r;