Add SPDX license identifiers to source files under the LGPL

[thirdparty/systemd.git] / src / core / slice.c

diff --git a/src/core/slice.c b/src/core/slice.c
index b414462066e891df87c341e9f04ec5d00931e794..5ab1e6f898764b687206f5ed499e5366820ddea5 100644 (file)
--- a/src/core/slice.c
+++ b/src/core/slice.c
@@ -1,5 +1,4 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
@@ -21,19 +20,28 @@
 
 #include <errno.h>
 
+#include "alloc-util.h"
+#include "dbus-slice.h"
 #include "log.h"
-#include "strv.h"
+#include "slice.h"
 #include "special.h"
+#include "string-util.h"
+#include "strv.h"
 #include "unit-name.h"
 #include "unit.h"
-#include "slice.h"
-#include "dbus-slice.h"
 
 static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = {
         [SLICE_DEAD] = UNIT_INACTIVE,
         [SLICE_ACTIVE] = UNIT_ACTIVE
 };
 
+static void slice_init(Unit *u) {
+        assert(u);
+        assert(u->load_state == UNIT_STUB);
+
+        u->ignore_on_isolate = true;
+}
+
 static void slice_set_state(Slice *t, SliceState state) {
         SliceState old_state;
         assert(t);
@@ -83,18 +91,20 @@ static int slice_add_default_dependencies(Slice *s) {
 
         assert(s);
 
+        if (!UNIT(s)->default_dependencies)
+                return 0;
+
         /* Make sure slices are unloaded on shutdown */
         r = unit_add_two_dependencies_by_name(
                         UNIT(s),
                         UNIT_BEFORE, UNIT_CONFLICTS,
-                        SPECIAL_SHUTDOWN_TARGET, NULL, true);
+                        SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT);
         if (r < 0)
                 return r;
 
         return 0;
 }
 
-
 static int slice_verify(Slice *s) {
         _cleanup_free_ char *parent = NULL;
         int r;
@@ -121,12 +131,38 @@ static int slice_verify(Slice *s) {
         return 0;
 }
 
+static int slice_load_root_slice(Unit *u) {
+        assert(u);
+
+        if (!unit_has_name(u, SPECIAL_ROOT_SLICE))
+                return 0;
+
+        u->perpetual = true;
+
+        /* The root slice is a bit special. For example it is always running and cannot be terminated. Because of its
+         * special semantics we synthesize it here, instead of relying on the unit file on disk. */
+
+        u->default_dependencies = false;
+        u->ignore_on_isolate = true;
+
+        if (!u->description)
+                u->description = strdup("Root Slice");
+        if (!u->documentation)
+                u->documentation = strv_new("man:systemd.special(7)", NULL);
+
+        return 1;
+}
+
 static int slice_load(Unit *u) {
         Slice *s = SLICE(u);
         int r;
 
         assert(s);
+        assert(u->load_state == UNIT_STUB);
 
+        r = slice_load_root_slice(u);
+        if (r < 0)
+                return r;
         r = unit_load_fragment_and_dropin_optional(u);
         if (r < 0)
                 return r;
@@ -142,11 +178,9 @@ static int slice_load(Unit *u) {
                 if (r < 0)
                         return r;
 
-                if (u->default_dependencies) {
-                        r = slice_add_default_dependencies(s);
-                        if (r < 0)
-                                return r;
-                }
+                r = slice_add_default_dependencies(s);
+                if (r < 0)
+                        return r;
         }
 
         return slice_verify(s);
@@ -179,12 +213,18 @@ static void slice_dump(Unit *u, FILE *f, const char *prefix) {
 
 static int slice_start(Unit *u) {
         Slice *t = SLICE(u);
+        int r;
 
         assert(t);
         assert(t->state == SLICE_DEAD);
 
+        r = unit_acquire_invocation_id(u);
+        if (r < 0)
+                return r;
+
         (void) unit_realize_cgroup(u);
-        (void) unit_reset_cpu_usage(u);
+        (void) unit_reset_cpu_accounting(u);
+        (void) unit_reset_ip_accounting(u);
 
         slice_set_state(t, SLICE_ACTIVE);
         return 1;
@@ -253,7 +293,7 @@ _pure_ static const char *slice_sub_state_to_string(Unit *u) {
         return slice_state_to_string(SLICE(u)->state);
 }
 
-static int slice_enumerate(Manager *m) {
+static void slice_enumerate(Manager *m) {
         Unit *u;
         int r;
 
@@ -261,39 +301,20 @@ static int slice_enumerate(Manager *m) {
 
         u = manager_get_unit(m, SPECIAL_ROOT_SLICE);
         if (!u) {
-                u = unit_new(m, sizeof(Slice));
-                if (!u)
-                        return log_oom();
-
-                r = unit_add_name(u, SPECIAL_ROOT_SLICE);
+                r = unit_new_for_name(m, sizeof(Slice), SPECIAL_ROOT_SLICE, &u);
                 if (r < 0) {
-                        unit_free(u);
-                        return log_error_errno(r, "Failed to add -.slice name");
+                        log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_SLICE " unit: %m");
+                        return;
                 }
         }
 
-        u->default_dependencies = false;
-        u->no_gc = true;
+        u->perpetual = true;
         SLICE(u)->deserialized_state = SLICE_ACTIVE;
 
-        if (!u->description)
-                u->description = strdup("Root Slice");
-        if (!u->documentation)
-                (void) strv_extend(&u->documentation, "man:systemd.special(7)");
-
         unit_add_to_load_queue(u);
         unit_add_to_dbus_queue(u);
-
-        return 0;
 }
 
-static const char* const slice_state_table[_SLICE_STATE_MAX] = {
-        [SLICE_DEAD] = "dead",
-        [SLICE_ACTIVE] = "active"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(slice_state, SliceState);
-
 const UnitVTable slice_vtable = {
         .object_size = sizeof(Slice),
         .cgroup_context_offset = offsetof(Slice, cgroup_context),
@@ -304,9 +325,9 @@ const UnitVTable slice_vtable = {
                 "Install\0",
         .private_section = "Slice",
 
-        .no_alias = true,
-        .no_instances = true,
+        .can_transient = true,
 
+        .init = slice_init,
         .load = slice_load,
 
         .coldplug = slice_coldplug,