6c12b52e19
"Scope" units are very much like service units, however with the difference that they are created from pre-existing processes, rather than processes that systemd itself forks off. This means they are generated programmatically via the bus API as transient units rather than from static configuration read from disk. Also, they do not provide execution-time parameters, as at the time systemd adds the processes to the scope unit they already exist and the parameters cannot be applied anymore. The primary benefit of this new unit type is to create arbitrary cgroups for worker-processes forked off an existing service. This commit also adds a a new mode to "systemd-run" to run the specified processes in a scope rather then a transient service.
323 lines
8.2 KiB
C
323 lines
8.2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include "unit.h"
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#include "slice.h"
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#include "load-fragment.h"
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#include "log.h"
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#include "dbus-slice.h"
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#include "special.h"
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#include "unit-name.h"
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static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = {
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[SLICE_DEAD] = UNIT_INACTIVE,
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[SLICE_ACTIVE] = UNIT_ACTIVE
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};
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static void slice_init(Unit *u) {
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Slice *s = SLICE(u);
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assert(u);
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assert(u->load_state == UNIT_STUB);
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cgroup_context_init(&s->cgroup_context);
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}
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static void slice_done(Unit *u) {
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Slice *s = SLICE(u);
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assert(u);
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cgroup_context_done(&s->cgroup_context);
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}
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static void slice_set_state(Slice *t, SliceState state) {
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SliceState old_state;
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assert(t);
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old_state = t->state;
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t->state = state;
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if (state != old_state)
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log_debug("%s changed %s -> %s",
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UNIT(t)->id,
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slice_state_to_string(old_state),
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slice_state_to_string(state));
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unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true);
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}
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static int slice_add_parent_slice(Slice *s) {
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char *a, *dash;
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Unit *parent;
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int r;
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assert(s);
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if (UNIT_ISSET(UNIT(s)->slice))
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return 0;
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if (unit_has_name(UNIT(s), SPECIAL_ROOT_SLICE))
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return 0;
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a = strdupa(UNIT(s)->id);
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dash = strrchr(a, '-');
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if (dash)
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strcpy(dash, ".slice");
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else
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a = (char*) SPECIAL_ROOT_SLICE;
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r = manager_load_unit(UNIT(s)->manager, a, NULL, NULL, &parent);
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if (r < 0)
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return r;
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unit_ref_set(&UNIT(s)->slice, parent);
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return 0;
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}
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static int slice_add_default_dependencies(Slice *s) {
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int r;
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assert(s);
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/* Make sure slices are unloaded on shutdown */
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r = unit_add_two_dependencies_by_name(
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UNIT(s),
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UNIT_BEFORE, UNIT_CONFLICTS,
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SPECIAL_SHUTDOWN_TARGET, NULL, true);
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if (r < 0)
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return r;
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return 0;
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}
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static int slice_verify(Slice *s) {
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assert(s);
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if (UNIT(s)->load_state != UNIT_LOADED)
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return 0;
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if (UNIT_DEREF(UNIT(s)->slice)) {
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char *a, *dash;
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a = strdupa(UNIT(s)->id);
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dash = strrchr(a, '-');
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if (dash)
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strcpy(dash, ".slice");
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else
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a = (char*) SPECIAL_ROOT_SLICE;
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if (!unit_has_name(UNIT_DEREF(UNIT(s)->slice), a)) {
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log_error_unit(UNIT(s)->id,
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"%s located outside its parent slice. Refusing.", UNIT(s)->id);
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return -EINVAL;
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}
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}
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return 0;
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}
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static int slice_load(Unit *u) {
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Slice *s = SLICE(u);
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int r;
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assert(s);
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r = unit_load_fragment_and_dropin_optional(u);
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if (r < 0)
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return r;
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/* This is a new unit? Then let's add in some extras */
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if (u->load_state == UNIT_LOADED) {
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r = slice_add_parent_slice(s);
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if (r < 0)
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return r;
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if (u->default_dependencies) {
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r = slice_add_default_dependencies(s);
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if (r < 0)
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return r;
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}
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}
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return slice_verify(s);
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}
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static int slice_coldplug(Unit *u) {
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Slice *t = SLICE(u);
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assert(t);
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assert(t->state == SLICE_DEAD);
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if (t->deserialized_state != t->state)
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slice_set_state(t, t->deserialized_state);
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return 0;
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}
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static void slice_dump(Unit *u, FILE *f, const char *prefix) {
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Slice *t = SLICE(u);
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assert(t);
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assert(f);
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fprintf(f,
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"%sSlice State: %s\n",
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prefix, slice_state_to_string(t->state));
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cgroup_context_dump(&t->cgroup_context, f, prefix);
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}
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static int slice_start(Unit *u) {
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Slice *t = SLICE(u);
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assert(t);
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assert(t->state == SLICE_DEAD);
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unit_realize_cgroup(u);
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slice_set_state(t, SLICE_ACTIVE);
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return 0;
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}
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static int slice_stop(Unit *u) {
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Slice *t = SLICE(u);
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assert(t);
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assert(t->state == SLICE_ACTIVE);
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/* We do not need to destroy the cgroup explicitly,
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* unit_notify() will do that for us anyway. */
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slice_set_state(t, SLICE_DEAD);
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return 0;
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}
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static int slice_kill(Unit *u, KillWho who, int signo, DBusError *error) {
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return unit_kill_common(u, who, signo, -1, -1, error);
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}
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static int slice_serialize(Unit *u, FILE *f, FDSet *fds) {
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Slice *s = SLICE(u);
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assert(s);
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assert(f);
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assert(fds);
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unit_serialize_item(u, f, "state", slice_state_to_string(s->state));
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return 0;
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}
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static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
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Slice *s = SLICE(u);
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assert(u);
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assert(key);
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assert(value);
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assert(fds);
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if (streq(key, "state")) {
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SliceState state;
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state = slice_state_from_string(value);
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if (state < 0)
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log_debug("Failed to parse state value %s", value);
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else
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s->deserialized_state = state;
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} else
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log_debug("Unknown serialization key '%s'", key);
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return 0;
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}
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_pure_ static UnitActiveState slice_active_state(Unit *u) {
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assert(u);
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return state_translation_table[SLICE(u)->state];
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}
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_pure_ static const char *slice_sub_state_to_string(Unit *u) {
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assert(u);
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return slice_state_to_string(SLICE(u)->state);
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}
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static const char* const slice_state_table[_SLICE_STATE_MAX] = {
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[SLICE_DEAD] = "dead",
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[SLICE_ACTIVE] = "active"
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};
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DEFINE_STRING_TABLE_LOOKUP(slice_state, SliceState);
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const UnitVTable slice_vtable = {
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.object_size = sizeof(Slice),
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.sections =
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"Unit\0"
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"Slice\0"
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"Install\0",
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.private_section = "Slice",
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.cgroup_context_offset = offsetof(Slice, cgroup_context),
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.no_alias = true,
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.no_instances = true,
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.init = slice_init,
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.load = slice_load,
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.done = slice_done,
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.coldplug = slice_coldplug,
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.dump = slice_dump,
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.start = slice_start,
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.stop = slice_stop,
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.kill = slice_kill,
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.serialize = slice_serialize,
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.deserialize_item = slice_deserialize_item,
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.active_state = slice_active_state,
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.sub_state_to_string = slice_sub_state_to_string,
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.bus_interface = "org.freedesktop.systemd1.Slice",
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.bus_message_handler = bus_slice_message_handler,
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.bus_set_property = bus_slice_set_property,
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.bus_commit_properties = bus_slice_commit_properties,
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.status_message_formats = {
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.finished_start_job = {
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[JOB_DONE] = "Created slice %s.",
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[JOB_DEPENDENCY] = "Dependency failed for %s.",
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},
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.finished_stop_job = {
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[JOB_DONE] = "Removed slice %s.",
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},
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},
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};
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