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systemd/src/unit.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
#include <sys/poll.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include "set.h"
#include "unit.h"
#include "macro.h"
#include "strv.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
#include "unit-name.h"
#include "specifier.h"
#include "dbus-unit.h"
#include "special.h"
#include "cgroup-util.h"
#include "missing.h"
#include "cgroup-attr.h"
const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
[UNIT_SERVICE] = &service_vtable,
[UNIT_TIMER] = &timer_vtable,
[UNIT_SOCKET] = &socket_vtable,
[UNIT_TARGET] = &target_vtable,
[UNIT_DEVICE] = &device_vtable,
[UNIT_MOUNT] = &mount_vtable,
[UNIT_AUTOMOUNT] = &automount_vtable,
[UNIT_SNAPSHOT] = &snapshot_vtable,
[UNIT_SWAP] = &swap_vtable,
[UNIT_PATH] = &path_vtable
};
Unit *unit_new(Manager *m) {
Unit *u;
assert(m);
if (!(u = new0(Unit, 1)))
return NULL;
if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
free(u);
return NULL;
}
u->meta.manager = m;
u->meta.type = _UNIT_TYPE_INVALID;
u->meta.deserialized_job = _JOB_TYPE_INVALID;
u->meta.default_dependencies = true;
u->meta.unit_file_state = _UNIT_FILE_STATE_INVALID;
return u;
}
bool unit_has_name(Unit *u, const char *name) {
assert(u);
assert(name);
return !!set_get(u->meta.names, (char*) name);
}
int unit_add_name(Unit *u, const char *text) {
UnitType t;
char *s, *i = NULL;
int r;
assert(u);
assert(text);
if (unit_name_is_template(text)) {
if (!u->meta.instance)
return -EINVAL;
s = unit_name_replace_instance(text, u->meta.instance);
} else
s = strdup(text);
if (!s)
return -ENOMEM;
if (!unit_name_is_valid(s, false)) {
r = -EINVAL;
goto fail;
}
assert_se((t = unit_name_to_type(s)) >= 0);
if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
r = -EINVAL;
goto fail;
}
if ((r = unit_name_to_instance(s, &i)) < 0)
goto fail;
if (i && unit_vtable[t]->no_instances) {
r = -EINVAL;
goto fail;
}
/* Ensure that this unit is either instanced or not instanced,
* but not both. */
if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
r = -EINVAL;
goto fail;
}
if (unit_vtable[t]->no_alias &&
!set_isempty(u->meta.names) &&
!set_get(u->meta.names, s)) {
r = -EEXIST;
goto fail;
}
if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
r = -E2BIG;
goto fail;
}
if ((r = set_put(u->meta.names, s)) < 0) {
if (r == -EEXIST)
r = 0;
goto fail;
}
if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
set_remove(u->meta.names, s);
goto fail;
}
if (u->meta.type == _UNIT_TYPE_INVALID) {
u->meta.type = t;
u->meta.id = s;
u->meta.instance = i;
LIST_PREPEND(Meta, units_by_type, u->meta.manager->units_by_type[t], &u->meta);
if (UNIT_VTABLE(u)->init)
UNIT_VTABLE(u)->init(u);
} else
free(i);
unit_add_to_dbus_queue(u);
return 0;
fail:
free(s);
free(i);
return r;
}
int unit_choose_id(Unit *u, const char *name) {
char *s, *t = NULL, *i;
int r;
assert(u);
assert(name);
if (unit_name_is_template(name)) {
if (!u->meta.instance)
return -EINVAL;
if (!(t = unit_name_replace_instance(name, u->meta.instance)))
return -ENOMEM;
name = t;
}
/* Selects one of the names of this unit as the id */
s = set_get(u->meta.names, (char*) name);
free(t);
if (!s)
return -ENOENT;
if ((r = unit_name_to_instance(s, &i)) < 0)
return r;
u->meta.id = s;
free(u->meta.instance);
u->meta.instance = i;
unit_add_to_dbus_queue(u);
return 0;
}
int unit_set_description(Unit *u, const char *description) {
char *s;
assert(u);
if (!(s = strdup(description)))
return -ENOMEM;
free(u->meta.description);
u->meta.description = s;
unit_add_to_dbus_queue(u);
return 0;
}
bool unit_check_gc(Unit *u) {
assert(u);
if (u->meta.load_state == UNIT_STUB)
return true;
if (UNIT_VTABLE(u)->no_gc)
return true;
if (u->meta.no_gc)
return true;
if (u->meta.job)
return true;
if (unit_active_state(u) != UNIT_INACTIVE)
return true;
if (UNIT_VTABLE(u)->check_gc)
if (UNIT_VTABLE(u)->check_gc(u))
return true;
return false;
}
void unit_add_to_load_queue(Unit *u) {
assert(u);
assert(u->meta.type != _UNIT_TYPE_INVALID);
if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
return;
LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
u->meta.in_load_queue = true;
}
void unit_add_to_cleanup_queue(Unit *u) {
assert(u);
if (u->meta.in_cleanup_queue)
return;
LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
u->meta.in_cleanup_queue = true;
}
void unit_add_to_gc_queue(Unit *u) {
assert(u);
if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
return;
if (unit_check_gc(u))
return;
LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
u->meta.in_gc_queue = true;
u->meta.manager->n_in_gc_queue ++;
if (u->meta.manager->gc_queue_timestamp <= 0)
u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
}
void unit_add_to_dbus_queue(Unit *u) {
assert(u);
assert(u->meta.type != _UNIT_TYPE_INVALID);
if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
return;
/* Shortcut things if nobody cares */
if (!bus_has_subscriber(u->meta.manager)) {
u->meta.sent_dbus_new_signal = true;
return;
}
LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
u->meta.in_dbus_queue = true;
}
static void bidi_set_free(Unit *u, Set *s) {
Iterator i;
Unit *other;
assert(u);
/* Frees the set and makes sure we are dropped from the
* inverse pointers */
SET_FOREACH(other, s, i) {
UnitDependency d;
for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
set_remove(other->meta.dependencies[d], u);
unit_add_to_gc_queue(other);
}
set_free(s);
}
void unit_free(Unit *u) {
UnitDependency d;
Iterator i;
char *t;
assert(u);
bus_unit_send_removed_signal(u);
if (u->meta.load_state != UNIT_STUB)
if (UNIT_VTABLE(u)->done)
UNIT_VTABLE(u)->done(u);
SET_FOREACH(t, u->meta.names, i)
hashmap_remove_value(u->meta.manager->units, t, u);
if (u->meta.job)
job_free(u->meta.job);
for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
bidi_set_free(u, u->meta.dependencies[d]);
if (u->meta.type != _UNIT_TYPE_INVALID)
LIST_REMOVE(Meta, units_by_type, u->meta.manager->units_by_type[u->meta.type], &u->meta);
if (u->meta.in_load_queue)
LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
if (u->meta.in_dbus_queue)
LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
if (u->meta.in_cleanup_queue)
LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
if (u->meta.in_gc_queue) {
LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
u->meta.manager->n_in_gc_queue--;
}
cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_reloading <= 0);
cgroup_attribute_free_list(u->meta.cgroup_attributes);
free(u->meta.description);
free(u->meta.fragment_path);
set_free_free(u->meta.names);
condition_free_list(u->meta.conditions);
free(u->meta.instance);
free(u);
}
UnitActiveState unit_active_state(Unit *u) {
assert(u);
if (u->meta.load_state == UNIT_MERGED)
return unit_active_state(unit_follow_merge(u));
/* After a reload it might happen that a unit is not correctly
* loaded but still has a process around. That's why we won't
* shortcut failed loading to UNIT_INACTIVE_FAILED. */
return UNIT_VTABLE(u)->active_state(u);
}
const char* unit_sub_state_to_string(Unit *u) {
assert(u);
return UNIT_VTABLE(u)->sub_state_to_string(u);
}
static void complete_move(Set **s, Set **other) {
assert(s);
assert(other);
if (!*other)
return;
if (*s)
set_move(*s, *other);
else {
*s = *other;
*other = NULL;
}
}
static void merge_names(Unit *u, Unit *other) {
char *t;
Iterator i;
assert(u);
assert(other);
complete_move(&u->meta.names, &other->meta.names);
set_free_free(other->meta.names);
other->meta.names = NULL;
other->meta.id = NULL;
SET_FOREACH(t, u->meta.names, i)
assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
}
static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
Iterator i;
Unit *back;
int r;
assert(u);
assert(other);
assert(d < _UNIT_DEPENDENCY_MAX);
/* Fix backwards pointers */
SET_FOREACH(back, other->meta.dependencies[d], i) {
UnitDependency k;
for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
if (r == -EEXIST)
set_remove(back->meta.dependencies[k], other);
else
assert(r == -ENOENT);
}
}
complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
set_free(other->meta.dependencies[d]);
other->meta.dependencies[d] = NULL;
}
int unit_merge(Unit *u, Unit *other) {
UnitDependency d;
assert(u);
assert(other);
assert(u->meta.manager == other->meta.manager);
assert(u->meta.type != _UNIT_TYPE_INVALID);
other = unit_follow_merge(other);
if (other == u)
return 0;
if (u->meta.type != other->meta.type)
return -EINVAL;
if (!u->meta.instance != !other->meta.instance)
return -EINVAL;
if (other->meta.load_state != UNIT_STUB &&
other->meta.load_state != UNIT_ERROR)
return -EEXIST;
if (other->meta.job)
return -EEXIST;
if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
return -EEXIST;
/* Merge names */
merge_names(u, other);
/* Merge dependencies */
for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
merge_dependencies(u, other, d);
other->meta.load_state = UNIT_MERGED;
other->meta.merged_into = u;
/* If there is still some data attached to the other node, we
* don't need it anymore, and can free it. */
if (other->meta.load_state != UNIT_STUB)
if (UNIT_VTABLE(other)->done)
UNIT_VTABLE(other)->done(other);
unit_add_to_dbus_queue(u);
unit_add_to_cleanup_queue(other);
return 0;
}
int unit_merge_by_name(Unit *u, const char *name) {
Unit *other;
int r;
char *s = NULL;
assert(u);
assert(name);
if (unit_name_is_template(name)) {
if (!u->meta.instance)
return -EINVAL;
if (!(s = unit_name_replace_instance(name, u->meta.instance)))
return -ENOMEM;
name = s;
}
if (!(other = manager_get_unit(u->meta.manager, name)))
r = unit_add_name(u, name);
else
r = unit_merge(u, other);
free(s);
return r;
}
Unit* unit_follow_merge(Unit *u) {
assert(u);
while (u->meta.load_state == UNIT_MERGED)
assert_se(u = u->meta.merged_into);
return u;
}
int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
int r;
assert(u);
assert(c);
if (c->std_output != EXEC_OUTPUT_KMSG &&
c->std_output != EXEC_OUTPUT_SYSLOG &&
c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
c->std_error != EXEC_OUTPUT_KMSG &&
c->std_error != EXEC_OUTPUT_SYSLOG &&
c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
return 0;
/* If syslog or kernel logging is requested, make sure our own
* logging daemon is run first. */
if (u->meta.manager->running_as == MANAGER_SYSTEM)
if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true)) < 0)
return r;
return 0;
}
const char *unit_description(Unit *u) {
assert(u);
if (u->meta.description)
return u->meta.description;
return strna(u->meta.id);
}
void unit_dump(Unit *u, FILE *f, const char *prefix) {
char *t;
UnitDependency d;
Iterator i;
char *p2;
const char *prefix2;
char
timestamp1[FORMAT_TIMESTAMP_MAX],
timestamp2[FORMAT_TIMESTAMP_MAX],
timestamp3[FORMAT_TIMESTAMP_MAX],
timestamp4[FORMAT_TIMESTAMP_MAX],
timespan[FORMAT_TIMESPAN_MAX];
Unit *following;
assert(u);
assert(u->meta.type >= 0);
if (!prefix)
prefix = "";
p2 = strappend(prefix, "\t");
prefix2 = p2 ? p2 : prefix;
fprintf(f,
"%s-> Unit %s:\n"
"%s\tDescription: %s\n"
"%s\tInstance: %s\n"
"%s\tUnit Load State: %s\n"
"%s\tUnit Active State: %s\n"
"%s\tInactive Exit Timestamp: %s\n"
"%s\tActive Enter Timestamp: %s\n"
"%s\tActive Exit Timestamp: %s\n"
"%s\tInactive Enter Timestamp: %s\n"
"%s\tGC Check Good: %s\n"
"%s\tNeed Daemon Reload: %s\n",
prefix, u->meta.id,
prefix, unit_description(u),
prefix, strna(u->meta.instance),
prefix, unit_load_state_to_string(u->meta.load_state),
prefix, unit_active_state_to_string(unit_active_state(u)),
prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
prefix, yes_no(unit_check_gc(u)),
prefix, yes_no(unit_need_daemon_reload(u)));
SET_FOREACH(t, u->meta.names, i)
fprintf(f, "%s\tName: %s\n", prefix, t);
if ((following = unit_following(u)))
fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
if (u->meta.fragment_path)
fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
if (u->meta.job_timeout > 0)
fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
condition_dump_list(u->meta.conditions, f, prefix);
if (dual_timestamp_is_set(&u->meta.condition_timestamp))
fprintf(f,
"%s\tCondition Timestamp: %s\n"
"%s\tCondition Result: %s\n",
prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
prefix, yes_no(u->meta.condition_result));
for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
Unit *other;
SET_FOREACH(other, u->meta.dependencies[d], i)
fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
}
if (u->meta.load_state == UNIT_LOADED) {
CGroupBonding *b;
CGroupAttribute *a;
fprintf(f,
"%s\tStopWhenUnneeded: %s\n"
"%s\tRefuseManualStart: %s\n"
"%s\tRefuseManualStop: %s\n"
"%s\tDefaultDependencies: %s\n"
"%s\tOnFailureIsolate: %s\n"
"%s\tIgnoreOnIsolate: %s\n"
"%s\tIgnoreOnSnapshot: %s\n",
prefix, yes_no(u->meta.stop_when_unneeded),
prefix, yes_no(u->meta.refuse_manual_start),
prefix, yes_no(u->meta.refuse_manual_stop),
prefix, yes_no(u->meta.default_dependencies),
prefix, yes_no(u->meta.on_failure_isolate),
prefix, yes_no(u->meta.ignore_on_isolate),
prefix, yes_no(u->meta.ignore_on_snapshot));
LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
fprintf(f, "%s\tControlGroup: %s:%s\n",
prefix, b->controller, b->path);
LIST_FOREACH(by_unit, a, u->meta.cgroup_attributes) {
char *v = NULL;
if (a->map_callback)
a->map_callback(a->controller, a->name, a->value, &v);
fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
prefix, a->controller, a->name, v ? v : a->value);
free(v);
}
if (UNIT_VTABLE(u)->dump)
UNIT_VTABLE(u)->dump(u, f, prefix2);
} else if (u->meta.load_state == UNIT_MERGED)
fprintf(f,
"%s\tMerged into: %s\n",
prefix, u->meta.merged_into->meta.id);
else if (u->meta.load_state == UNIT_ERROR)
fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
if (u->meta.job)
job_dump(u->meta.job, f, prefix2);
free(p2);
}
/* Common implementation for multiple backends */
int unit_load_fragment_and_dropin(Unit *u) {
int r;
assert(u);
/* Load a .service file */
if ((r = unit_load_fragment(u)) < 0)
return r;
if (u->meta.load_state == UNIT_STUB)
return -ENOENT;
/* Load drop-in directory data */
if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
return r;
return 0;
}
/* Common implementation for multiple backends */
int unit_load_fragment_and_dropin_optional(Unit *u) {
int r;
assert(u);
/* Same as unit_load_fragment_and_dropin(), but whether
* something can be loaded or not doesn't matter. */
/* Load a .service file */
if ((r = unit_load_fragment(u)) < 0)
return r;
if (u->meta.load_state == UNIT_STUB)
u->meta.load_state = UNIT_LOADED;
/* Load drop-in directory data */
if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
return r;
return 0;
}
int unit_add_default_target_dependency(Unit *u, Unit *target) {
assert(u);
assert(target);
if (target->meta.type != UNIT_TARGET)
return 0;
/* Only add the dependency if both units are loaded, so that
* that loop check below is reliable */
if (u->meta.load_state != UNIT_LOADED ||
target->meta.load_state != UNIT_LOADED)
return 0;
/* If either side wants no automatic dependencies, then let's
* skip this */
if (!u->meta.default_dependencies ||
!target->meta.default_dependencies)
return 0;
/* Don't create loops */
if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
return 0;
return unit_add_dependency(target, UNIT_AFTER, u, true);
}
static int unit_add_default_dependencies(Unit *u) {
static const UnitDependency deps[] = {
UNIT_REQUIRED_BY,
UNIT_REQUIRED_BY_OVERRIDABLE,
UNIT_WANTED_BY,
UNIT_BOUND_BY
};
Unit *target;
Iterator i;
int r;
unsigned k;
assert(u);
for (k = 0; k < ELEMENTSOF(deps); k++)
SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
if ((r = unit_add_default_target_dependency(u, target)) < 0)
return r;
return 0;
}
int unit_load(Unit *u) {
int r;
assert(u);
if (u->meta.in_load_queue) {
LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
u->meta.in_load_queue = false;
}
if (u->meta.type == _UNIT_TYPE_INVALID)
return -EINVAL;
if (u->meta.load_state != UNIT_STUB)
return 0;
if (UNIT_VTABLE(u)->load)
if ((r = UNIT_VTABLE(u)->load(u)) < 0)
goto fail;
if (u->meta.load_state == UNIT_STUB) {
r = -ENOENT;
goto fail;
}
if (u->meta.load_state == UNIT_LOADED &&
u->meta.default_dependencies)
if ((r = unit_add_default_dependencies(u)) < 0)
goto fail;
if (u->meta.on_failure_isolate &&
set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
u->meta.id);
r = -EINVAL;
goto fail;
}
assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
unit_add_to_dbus_queue(unit_follow_merge(u));
unit_add_to_gc_queue(u);
return 0;
fail:
u->meta.load_state = UNIT_ERROR;
u->meta.load_error = r;
unit_add_to_dbus_queue(u);
unit_add_to_gc_queue(u);
log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
return r;
}
bool unit_condition_test(Unit *u) {
assert(u);
dual_timestamp_get(&u->meta.condition_timestamp);
u->meta.condition_result = condition_test_list(u->meta.conditions);
return u->meta.condition_result;
}
/* Errors:
* -EBADR: This unit type does not support starting.
* -EALREADY: Unit is already started.
* -EAGAIN: An operation is already in progress. Retry later.
* -ECANCELED: Too many requests for now.
*/
int unit_start(Unit *u) {
UnitActiveState state;
Unit *following;
assert(u);
if (u->meta.load_state != UNIT_LOADED)
return -EINVAL;
/* If this is already started, then this will succeed. Note
* that this will even succeed if this unit is not startable
* by the user. This is relied on to detect when we need to
* wait for units and when waiting is finished. */
state = unit_active_state(u);
if (UNIT_IS_ACTIVE_OR_RELOADING(state))
return -EALREADY;
/* If the conditions failed, don't do anything at all. If we
* already are activating this call might still be useful to
* speed up activation in case there is some hold-off time,
* but we don't want to recheck the condition in that case. */
if (state != UNIT_ACTIVATING &&
!unit_condition_test(u)) {
log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
return -EALREADY;
}
/* Forward to the main object, if we aren't it. */
if ((following = unit_following(u))) {
log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
return unit_start(following);
}
/* If it is stopped, but we cannot start it, then fail */
if (!UNIT_VTABLE(u)->start)
return -EBADR;
/* We don't suppress calls to ->start() here when we are
* already starting, to allow this request to be used as a
* "hurry up" call, for example when the unit is in some "auto
* restart" state where it waits for a holdoff timer to elapse
* before it will start again. */
unit_add_to_dbus_queue(u);
unit_status_printf(u, NULL, "Starting %s...", unit_description(u));
return UNIT_VTABLE(u)->start(u);
}
bool unit_can_start(Unit *u) {
assert(u);
return !!UNIT_VTABLE(u)->start;
}
bool unit_can_isolate(Unit *u) {
assert(u);
return unit_can_start(u) &&
u->meta.allow_isolate;
}
/* Errors:
* -EBADR: This unit type does not support stopping.
* -EALREADY: Unit is already stopped.
* -EAGAIN: An operation is already in progress. Retry later.
*/
int unit_stop(Unit *u) {
UnitActiveState state;
Unit *following;
assert(u);
state = unit_active_state(u);
if (UNIT_IS_INACTIVE_OR_FAILED(state))
return -EALREADY;
if ((following = unit_following(u))) {
log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
return unit_stop(following);
}
if (!UNIT_VTABLE(u)->stop)
return -EBADR;
unit_add_to_dbus_queue(u);
unit_status_printf(u, NULL, "Stopping %s...", unit_description(u));
return UNIT_VTABLE(u)->stop(u);
}
/* Errors:
* -EBADR: This unit type does not support reloading.
* -ENOEXEC: Unit is not started.
* -EAGAIN: An operation is already in progress. Retry later.
*/
int unit_reload(Unit *u) {
UnitActiveState state;
Unit *following;
assert(u);
if (u->meta.load_state != UNIT_LOADED)
return -EINVAL;
if (!unit_can_reload(u))
return -EBADR;
state = unit_active_state(u);
if (state == UNIT_RELOADING)
return -EALREADY;
if (state != UNIT_ACTIVE)
return -ENOEXEC;
if ((following = unit_following(u))) {
log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
return unit_reload(following);
}
unit_add_to_dbus_queue(u);
return UNIT_VTABLE(u)->reload(u);
}
bool unit_can_reload(Unit *u) {
assert(u);
if (!UNIT_VTABLE(u)->reload)
return false;
if (!UNIT_VTABLE(u)->can_reload)
return true;
return UNIT_VTABLE(u)->can_reload(u);
}
static void unit_check_unneeded(Unit *u) {
Iterator i;
Unit *other;
assert(u);
/* If this service shall be shut down when unneeded then do
* so. */
if (!u->meta.stop_when_unneeded)
return;
if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
return;
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
if (unit_pending_active(other))
return;
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
if (unit_pending_active(other))
return;
SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
if (unit_pending_active(other))
return;
SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
if (unit_pending_active(other))
return;
log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
/* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
}
static void retroactively_start_dependencies(Unit *u) {
Iterator i;
Unit *other;
assert(u);
assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
}
static void retroactively_stop_dependencies(Unit *u) {
Iterator i;
Unit *other;
assert(u);
assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
/* Pull down units which are bound to us recursively if enabled */
SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
}
static void check_unneeded_dependencies(Unit *u) {
Iterator i;
Unit *other;
assert(u);
assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
/* Garbage collect services that might not be needed anymore, if enabled */
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_unneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_unneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_unneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_unneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_unneeded(other);
SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
unit_check_unneeded(other);
}
void unit_trigger_on_failure(Unit *u) {
Unit *other;
Iterator i;
assert(u);
if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
return;
log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
int r;
if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
}
}
void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
bool unexpected;
assert(u);
assert(os < _UNIT_ACTIVE_STATE_MAX);
assert(ns < _UNIT_ACTIVE_STATE_MAX);
/* Note that this is called for all low-level state changes,
* even if they might map to the same high-level
* UnitActiveState! That means that ns == os is OK an expected
* behaviour here. For example: if a mount point is remounted
* this function will be called too! */
if (u->meta.manager->n_reloading <= 0) {
dual_timestamp ts;
dual_timestamp_get(&ts);
if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
u->meta.inactive_exit_timestamp = ts;
else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
u->meta.inactive_enter_timestamp = ts;
if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
u->meta.active_enter_timestamp = ts;
else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
u->meta.active_exit_timestamp = ts;
timer_unit_notify(u, ns);
path_unit_notify(u, ns);
}
if (UNIT_IS_INACTIVE_OR_FAILED(ns))
cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
if (u->meta.job) {
unexpected = false;
if (u->meta.job->state == JOB_WAITING)
/* So we reached a different state for this
* job. Let's see if we can run it now if it
* failed previously due to EAGAIN. */
job_add_to_run_queue(u->meta.job);
/* Let's check whether this state change constitutes a
* finished job, or maybe contradicts a running job and
* hence needs to invalidate jobs. */
switch (u->meta.job->type) {
case JOB_START:
case JOB_VERIFY_ACTIVE:
if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
job_finish_and_invalidate(u->meta.job, JOB_DONE);
else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
unexpected = true;
if (UNIT_IS_INACTIVE_OR_FAILED(ns))
job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
}
break;
case JOB_RELOAD:
case JOB_RELOAD_OR_START:
if (u->meta.job->state == JOB_RUNNING) {
if (ns == UNIT_ACTIVE)
job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
unexpected = true;
if (UNIT_IS_INACTIVE_OR_FAILED(ns))
job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
}
}
break;
case JOB_STOP:
case JOB_RESTART:
case JOB_TRY_RESTART:
if (UNIT_IS_INACTIVE_OR_FAILED(ns))
job_finish_and_invalidate(u->meta.job, JOB_DONE);
else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
unexpected = true;
job_finish_and_invalidate(u->meta.job, JOB_FAILED);
}
break;
default:
assert_not_reached("Job type unknown");
}
} else
unexpected = true;
if (u->meta.manager->n_reloading <= 0) {
/* If this state change happened without being
* requested by a job, then let's retroactively start
* or stop dependencies. We skip that step when
* deserializing, since we don't want to create any
* additional jobs just because something is already
* activated. */
if (unexpected) {
if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
retroactively_start_dependencies(u);
else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
retroactively_stop_dependencies(u);
}
/* stop unneeded units regardless if going down was expected or not */
if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
check_unneeded_dependencies(u);
if (ns != os && ns == UNIT_FAILED) {
log_notice("Unit %s entered failed state.", u->meta.id);
unit_trigger_on_failure(u);
}
}
/* Some names are special */
if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
/* The bus just might have become available,
* hence try to connect to it, if we aren't
* yet connected. */
bus_init(u->meta.manager, true);
if (u->meta.type == UNIT_SERVICE &&
!UNIT_IS_ACTIVE_OR_RELOADING(os) &&
u->meta.manager->n_reloading <= 0) {
/* Write audit record if we have just finished starting up */
manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
u->meta.in_audit = true;
}
if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
manager_send_unit_plymouth(u->meta.manager, u);
} else {
/* We don't care about D-Bus here, since we'll get an
* asynchronous notification for it anyway. */
if (u->meta.type == UNIT_SERVICE &&
UNIT_IS_INACTIVE_OR_FAILED(ns) &&
!UNIT_IS_INACTIVE_OR_FAILED(os) &&
u->meta.manager->n_reloading <= 0) {
/* Hmm, if there was no start record written
* write it now, so that we always have a nice
* pair */
if (!u->meta.in_audit) {
manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
if (ns == UNIT_INACTIVE)
manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
} else
/* Write audit record if we have just finished shutting down */
manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
u->meta.in_audit = false;
}
}
manager_recheck_syslog(u->meta.manager);
/* Maybe we finished startup and are now ready for being
* stopped because unneeded? */
unit_check_unneeded(u);
unit_add_to_dbus_queue(u);
unit_add_to_gc_queue(u);
}
int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
struct epoll_event ev;
assert(u);
assert(fd >= 0);
assert(w);
assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
zero(ev);
ev.data.ptr = w;
ev.events = events;
if (epoll_ctl(u->meta.manager->epoll_fd,
w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
fd,
&ev) < 0)
return -errno;
w->fd = fd;
w->type = WATCH_FD;
w->data.unit = u;
return 0;
}
void unit_unwatch_fd(Unit *u, Watch *w) {
assert(u);
assert(w);
if (w->type == WATCH_INVALID)
return;
assert(w->type == WATCH_FD);
assert(w->data.unit == u);
assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
w->fd = -1;
w->type = WATCH_INVALID;
w->data.unit = NULL;
}
int unit_watch_pid(Unit *u, pid_t pid) {
assert(u);
assert(pid >= 1);
/* Watch a specific PID. We only support one unit watching
* each PID for now. */
return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
}
void unit_unwatch_pid(Unit *u, pid_t pid) {
assert(u);
assert(pid >= 1);
hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
}
int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
struct itimerspec its;
int flags, fd;
bool ours;
assert(u);
assert(w);
assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
/* This will try to reuse the old timer if there is one */
if (w->type == WATCH_UNIT_TIMER) {
assert(w->data.unit == u);
assert(w->fd >= 0);
ours = false;
fd = w->fd;
} else if (w->type == WATCH_INVALID) {
ours = true;
if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
return -errno;
} else
assert_not_reached("Invalid watch type");
zero(its);
if (delay <= 0) {
/* Set absolute time in the past, but not 0, since we
* don't want to disarm the timer */
its.it_value.tv_sec = 0;
its.it_value.tv_nsec = 1;
flags = TFD_TIMER_ABSTIME;
} else {
timespec_store(&its.it_value, delay);
flags = 0;
}
/* This will also flush the elapse counter */
if (timerfd_settime(fd, flags, &its, NULL) < 0)
goto fail;
if (w->type == WATCH_INVALID) {
struct epoll_event ev;
zero(ev);
ev.data.ptr = w;
ev.events = EPOLLIN;
if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
goto fail;
}
w->type = WATCH_UNIT_TIMER;
w->fd = fd;
w->data.unit = u;
return 0;
fail:
if (ours)
close_nointr_nofail(fd);
return -errno;
}
void unit_unwatch_timer(Unit *u, Watch *w) {
assert(u);
assert(w);
if (w->type == WATCH_INVALID)
return;
assert(w->type == WATCH_UNIT_TIMER);
assert(w->data.unit == u);
assert(w->fd >= 0);
assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
close_nointr_nofail(w->fd);
w->fd = -1;
w->type = WATCH_INVALID;
w->data.unit = NULL;
}
bool unit_job_is_applicable(Unit *u, JobType j) {
assert(u);
assert(j >= 0 && j < _JOB_TYPE_MAX);
switch (j) {
case JOB_VERIFY_ACTIVE:
case JOB_START:
case JOB_STOP:
return true;
case JOB_RESTART:
case JOB_TRY_RESTART:
return unit_can_start(u);
case JOB_RELOAD:
return unit_can_reload(u);
case JOB_RELOAD_OR_START:
return unit_can_reload(u) && unit_can_start(u);
default:
assert_not_reached("Invalid job type");
}
}
int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
[UNIT_REQUIRES] = UNIT_REQUIRED_BY,
[UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
[UNIT_WANTS] = UNIT_WANTED_BY,
[UNIT_REQUISITE] = UNIT_REQUIRED_BY,
[UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
[UNIT_BIND_TO] = UNIT_BOUND_BY,
[UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
[UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
[UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
[UNIT_BOUND_BY] = UNIT_BIND_TO,
[UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
[UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
[UNIT_BEFORE] = UNIT_AFTER,
[UNIT_AFTER] = UNIT_BEFORE,
[UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
[UNIT_REFERENCES] = UNIT_REFERENCED_BY,
[UNIT_REFERENCED_BY] = UNIT_REFERENCES
};
int r, q = 0, v = 0, w = 0;
assert(u);
assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
assert(other);
u = unit_follow_merge(u);
other = unit_follow_merge(other);
/* We won't allow dependencies on ourselves. We will not
* consider them an error however. */
if (u == other)
return 0;
if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
return r;
if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
return r;
if (add_reference)
if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
(r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
return r;
if ((q = set_put(u->meta.dependencies[d], other)) < 0)
return q;
if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
r = v;
goto fail;
}
if (add_reference) {
if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
r = w;
goto fail;
}
if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
goto fail;
}
unit_add_to_dbus_queue(u);
return 0;
fail:
if (q > 0)
set_remove(u->meta.dependencies[d], other);
if (v > 0)
set_remove(other->meta.dependencies[inverse_table[d]], u);
if (w > 0)
set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
return r;
}
int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
int r;
assert(u);
if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
return r;
if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
return r;
return 0;
}
static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
char *s;
assert(u);
assert(name || path);
if (!name)
name = file_name_from_path(path);
if (!unit_name_is_template(name)) {
*p = NULL;
return name;
}
if (u->meta.instance)
s = unit_name_replace_instance(name, u->meta.instance);
else {
char *i;
if (!(i = unit_name_to_prefix(u->meta.id)))
return NULL;
s = unit_name_replace_instance(name, i);
free(i);
}
if (!s)
return NULL;
*p = s;
return s;
}
int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
Unit *other;
int r;
char *s;
assert(u);
assert(name || path);
if (!(name = resolve_template(u, name, path, &s)))
return -ENOMEM;
if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
goto finish;
r = unit_add_dependency(u, d, other, add_reference);
finish:
free(s);
return r;
}
int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
Unit *other;
int r;
char *s;
assert(u);
assert(name || path);
if (!(name = resolve_template(u, name, path, &s)))
return -ENOMEM;
if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
goto finish;
r = unit_add_two_dependencies(u, d, e, other, add_reference);
finish:
free(s);
return r;
}
int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
Unit *other;
int r;
char *s;
assert(u);
assert(name || path);
if (!(name = resolve_template(u, name, path, &s)))
return -ENOMEM;
if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
goto finish;
r = unit_add_dependency(other, d, u, add_reference);
finish:
free(s);
return r;
}
int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
Unit *other;
int r;
char *s;
assert(u);
assert(name || path);
if (!(name = resolve_template(u, name, path, &s)))
return -ENOMEM;
if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
goto finish;
if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
goto finish;
finish:
free(s);
return r;
}
int set_unit_path(const char *p) {
char *cwd, *c;
int r;
/* This is mostly for debug purposes */
if (path_is_absolute(p)) {
if (!(c = strdup(p)))
return -ENOMEM;
} else {
if (!(cwd = get_current_dir_name()))
return -errno;
r = asprintf(&c, "%s/%s", cwd, p);
free(cwd);
if (r < 0)
return -ENOMEM;
}
if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
r = -errno;
free(c);
return r;
}
return 0;
}
char *unit_dbus_path(Unit *u) {
char *p, *e;
assert(u);
if (!u->meta.id)
return NULL;
if (!(e = bus_path_escape(u->meta.id)))
return NULL;
p = strappend("/org/freedesktop/systemd1/unit/", e);
free(e);
return p;
}
int unit_add_cgroup(Unit *u, CGroupBonding *b) {
int r;
assert(u);
assert(b);
assert(b->path);
if (!b->controller) {
if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
return -ENOMEM;
b->ours = true;
}
/* Ensure this hasn't been added yet */
assert(!b->unit);
if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
CGroupBonding *l;
l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
LIST_PREPEND(CGroupBonding, by_path, l, b);
if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
LIST_REMOVE(CGroupBonding, by_path, l, b);
return r;
}
}
LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
b->unit = u;
return 0;
}
static char *default_cgroup_path(Unit *u) {
char *p;
assert(u);
if (u->meta.instance) {
char *t;
t = unit_name_template(u->meta.id);
if (!t)
return NULL;
p = join(u->meta.manager->cgroup_hierarchy, "/", t, "/", u->meta.instance, NULL);
free(t);
} else
p = join(u->meta.manager->cgroup_hierarchy, "/", u->meta.id, NULL);
return p;
}
int unit_add_cgroup_from_text(Unit *u, const char *name) {
char *controller = NULL, *path = NULL;
CGroupBonding *b = NULL;
bool ours = false;
int r;
assert(u);
assert(name);
if ((r = cg_split_spec(name, &controller, &path)) < 0)
return r;
if (!path) {
path = default_cgroup_path(u);
ours = true;
}
if (!controller) {
controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
ours = true;
}
if (!path || !controller) {
free(path);
free(controller);
return -ENOMEM;
}
if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
r = -EEXIST;
goto fail;
}
if (!(b = new0(CGroupBonding, 1))) {
r = -ENOMEM;
goto fail;
}
b->controller = controller;
b->path = path;
b->ours = ours;
b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
if ((r = unit_add_cgroup(u, b)) < 0)
goto fail;
return 0;
fail:
free(path);
free(controller);
free(b);
return r;
}
static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
CGroupBonding *b = NULL;
int r = -ENOMEM;
assert(u);
if (!controller)
controller = SYSTEMD_CGROUP_CONTROLLER;
if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
return 0;
if (!(b = new0(CGroupBonding, 1)))
return -ENOMEM;
if (!(b->controller = strdup(controller)))
goto fail;
if (!(b->path = default_cgroup_path(u)))
goto fail;
b->ours = true;
b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
if ((r = unit_add_cgroup(u, b)) < 0)
goto fail;
return 0;
fail:
free(b->path);
free(b->controller);
free(b);
return r;
}
int unit_add_default_cgroups(Unit *u) {
CGroupAttribute *a;
char **c;
int r;
assert(u);
/* Adds in the default cgroups, if they weren't specified
* otherwise. */
if (!u->meta.manager->cgroup_hierarchy)
return 0;
if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
return r;
STRV_FOREACH(c, u->meta.manager->default_controllers)
unit_add_one_default_cgroup(u, *c);
LIST_FOREACH(by_unit, a, u->meta.cgroup_attributes)
unit_add_one_default_cgroup(u, a->controller);
return 0;
}
CGroupBonding* unit_get_default_cgroup(Unit *u) {
assert(u);
return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
}
int unit_add_cgroup_attribute(Unit *u, const char *controller, const char *name, const char *value, CGroupAttributeMapCallback map_callback) {
int r;
char *c = NULL;
CGroupAttribute *a;
assert(u);
assert(name);
assert(value);
if (!controller) {
const char *dot;
dot = strchr(name, '.');
if (!dot)
return -EINVAL;
c = strndup(name, dot - name);
if (!c)
return -ENOMEM;
controller = c;
}
if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
r = -EINVAL;
goto finish;
}
a = new0(CGroupAttribute, 1);
if (!a) {
r = -ENOMEM;
goto finish;
}
if (c) {
a->controller = c;
c = NULL;
} else
a->controller = strdup(controller);
a->name = strdup(name);
a->value = strdup(value);
if (!a->controller || !a->name || !a->value) {
free(a->controller);
free(a->name);
free(a->value);
free(a);
return -ENOMEM;
}
a->map_callback = map_callback;
LIST_PREPEND(CGroupAttribute, by_unit, u->meta.cgroup_attributes, a);
r = 0;
finish:
free(c);
return r;
}
int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
char *t;
int r;
assert(u);
assert(type);
assert(_found);
if (!(t = unit_name_change_suffix(u->meta.id, type)))
return -ENOMEM;
assert(!unit_has_name(u, t));
r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
free(t);
assert(r < 0 || *_found != u);
return r;
}
int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
Unit *found;
char *t;
assert(u);
assert(type);
assert(_found);
if (!(t = unit_name_change_suffix(u->meta.id, type)))
return -ENOMEM;
assert(!unit_has_name(u, t));
found = manager_get_unit(u->meta.manager, t);
free(t);
if (!found)
return -ENOENT;
*_found = found;
return 0;
}
static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
Unit *u = userdata;
assert(u);
return unit_name_to_prefix_and_instance(u->meta.id);
}
static char *specifier_prefix(char specifier, void *data, void *userdata) {
Unit *u = userdata;
assert(u);
return unit_name_to_prefix(u->meta.id);
}
static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
Unit *u = userdata;
char *p, *r;
assert(u);
if (!(p = unit_name_to_prefix(u->meta.id)))
return NULL;
r = unit_name_unescape(p);
free(p);
return r;
}
static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
Unit *u = userdata;
assert(u);
if (u->meta.instance)
return unit_name_unescape(u->meta.instance);
return strdup("");
}
static char *specifier_filename(char specifier, void *data, void *userdata) {
Unit *u = userdata;
assert(u);
if (u->meta.instance)
return unit_name_path_unescape(u->meta.instance);
return unit_name_to_path(u->meta.instance);
}
static char *specifier_cgroup(char specifier, void *data, void *userdata) {
Unit *u = userdata;
assert(u);
return default_cgroup_path(u);
}
static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
Unit *u = userdata;
char *p;
assert(u);
if (specifier == 'r')
return strdup(u->meta.manager->cgroup_hierarchy);
if (parent_of_path(u->meta.manager->cgroup_hierarchy, &p) < 0)
return strdup("");
if (streq(p, "/")) {
free(p);
return strdup("");
}
return p;
}
static char *specifier_runtime(char specifier, void *data, void *userdata) {
Unit *u = userdata;
assert(u);
if (u->meta.manager->running_as == MANAGER_USER) {
const char *e;
e = getenv("XDG_RUNTIME_DIR");
if (e)
return strdup(e);
}
return strdup("/run");
}
char *unit_name_printf(Unit *u, const char* format) {
/*
* This will use the passed string as format string and
* replace the following specifiers:
*
* %n: the full id of the unit (foo@bar.waldo)
* %N: the id of the unit without the suffix (foo@bar)
* %p: the prefix (foo)
* %i: the instance (bar)
*/
const Specifier table[] = {
{ 'n', specifier_string, u->meta.id },
{ 'N', specifier_prefix_and_instance, NULL },
{ 'p', specifier_prefix, NULL },
{ 'i', specifier_string, u->meta.instance },
{ 0, NULL, NULL }
};
assert(u);
assert(format);
return specifier_printf(format, table, u);
}
char *unit_full_printf(Unit *u, const char *format) {
/* This is similar to unit_name_printf() but also supports
* unescaping. Also, adds a couple of additional codes:
*
* %c cgroup path of unit
* %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
* %R parent of root cgroup path (e.g. "/usr/lennart/shared")
* %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
*/
const Specifier table[] = {
{ 'n', specifier_string, u->meta.id },
{ 'N', specifier_prefix_and_instance, NULL },
{ 'p', specifier_prefix, NULL },
{ 'P', specifier_prefix_unescaped, NULL },
{ 'i', specifier_string, u->meta.instance },
{ 'I', specifier_instance_unescaped, NULL },
{ 'f', specifier_filename, NULL },
{ 'c', specifier_cgroup, NULL },
{ 'r', specifier_cgroup_root, NULL },
{ 'R', specifier_cgroup_root, NULL },
{ 't', specifier_runtime, NULL },
{ 0, NULL, NULL }
};
assert(u);
assert(format);
return specifier_printf(format, table, u);
}
char **unit_full_printf_strv(Unit *u, char **l) {
size_t n;
char **r, **i, **j;
/* Applies unit_full_printf to every entry in l */
assert(u);
n = strv_length(l);
if (!(r = new(char*, n+1)))
return NULL;
for (i = l, j = r; *i; i++, j++)
if (!(*j = unit_full_printf(u, *i)))
goto fail;
*j = NULL;
return r;
fail:
for (j--; j >= r; j--)
free(*j);
free(r);
return NULL;
}
int unit_watch_bus_name(Unit *u, const char *name) {
assert(u);
assert(name);
/* Watch a specific name on the bus. We only support one unit
* watching each name for now. */
return hashmap_put(u->meta.manager->watch_bus, name, u);
}
void unit_unwatch_bus_name(Unit *u, const char *name) {
assert(u);
assert(name);
hashmap_remove_value(u->meta.manager->watch_bus, name, u);
}
bool unit_can_serialize(Unit *u) {
assert(u);
return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
}
int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
int r;
assert(u);
assert(f);
assert(fds);
if (!unit_can_serialize(u))
return 0;
if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
return r;
if (u->meta.job)
unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
if (dual_timestamp_is_set(&u->meta.condition_timestamp))
unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
/* End marker */
fputc('\n', f);
return 0;
}
void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
va_list ap;
assert(u);
assert(f);
assert(key);
assert(format);
fputs(key, f);
fputc('=', f);
va_start(ap, format);
vfprintf(f, format, ap);
va_end(ap);
fputc('\n', f);
}
void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
assert(u);
assert(f);
assert(key);
assert(value);
fprintf(f, "%s=%s\n", key, value);
}
int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
int r;
assert(u);
assert(f);
assert(fds);
if (!unit_can_serialize(u))
return 0;
for (;;) {
char line[LINE_MAX], *l, *v;
size_t k;
if (!fgets(line, sizeof(line), f)) {
if (feof(f))
return 0;
return -errno;
}
char_array_0(line);
l = strstrip(line);
/* End marker */
if (l[0] == 0)
return 0;
k = strcspn(l, "=");
if (l[k] == '=') {
l[k] = 0;
v = l+k+1;
} else
v = l+k;
if (streq(l, "job")) {
JobType type;
if ((type = job_type_from_string(v)) < 0)
log_debug("Failed to parse job type value %s", v);
else
u->meta.deserialized_job = type;
continue;
} else if (streq(l, "inactive-exit-timestamp")) {
dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
continue;
} else if (streq(l, "active-enter-timestamp")) {
dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
continue;
} else if (streq(l, "active-exit-timestamp")) {
dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
continue;
} else if (streq(l, "inactive-enter-timestamp")) {
dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
continue;
} else if (streq(l, "condition-timestamp")) {
dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
continue;
} else if (streq(l, "condition-result")) {
int b;
if ((b = parse_boolean(v)) < 0)
log_debug("Failed to parse condition result value %s", v);
else
u->meta.condition_result = b;
continue;
}
if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
return r;
}
}
int unit_add_node_link(Unit *u, const char *what, bool wants) {
Unit *device;
char *e;
int r;
assert(u);
if (!what)
return 0;
/* Adds in links to the device node that this unit is based on */
if (!is_device_path(what))
return 0;
if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
return -ENOMEM;
r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
free(e);
if (r < 0)
return r;
if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
return r;
if (wants)
if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
return r;
return 0;
}
int unit_coldplug(Unit *u) {
int r;
assert(u);
if (UNIT_VTABLE(u)->coldplug)
if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
return r;
if (u->meta.deserialized_job >= 0) {
if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
return r;
u->meta.deserialized_job = _JOB_TYPE_INVALID;
}
return 0;
}
void unit_status_printf(Unit *u, const char *status, const char *format, ...) {
va_list ap;
assert(u);
assert(format);
if (!UNIT_VTABLE(u)->show_status)
return;
if (!manager_get_show_status(u->meta.manager))
return;
if (!manager_is_booting_or_shutting_down(u->meta.manager))
return;
va_start(ap, format);
status_vprintf(status, true, format, ap);
va_end(ap);
}
bool unit_need_daemon_reload(Unit *u) {
assert(u);
if (u->meta.fragment_path) {
struct stat st;
zero(st);
if (stat(u->meta.fragment_path, &st) < 0)
/* What, cannot access this anymore? */
return true;
if (u->meta.fragment_mtime > 0 &&
timespec_load(&st.st_mtim) != u->meta.fragment_mtime)
return true;
}
if (UNIT_VTABLE(u)->need_daemon_reload)
return UNIT_VTABLE(u)->need_daemon_reload(u);
return false;
}
void unit_reset_failed(Unit *u) {
assert(u);
if (UNIT_VTABLE(u)->reset_failed)
UNIT_VTABLE(u)->reset_failed(u);
}
Unit *unit_following(Unit *u) {
assert(u);
if (UNIT_VTABLE(u)->following)
return UNIT_VTABLE(u)->following(u);
return NULL;
}
bool unit_pending_inactive(Unit *u) {
assert(u);
/* Returns true if the unit is inactive or going down */
if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
return true;
if (u->meta.job && u->meta.job->type == JOB_STOP)
return true;
return false;
}
bool unit_pending_active(Unit *u) {
assert(u);
/* Returns true if the unit is active or going up */
if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
return true;
if (u->meta.job &&
(u->meta.job->type == JOB_START ||
u->meta.job->type == JOB_RELOAD_OR_START ||
u->meta.job->type == JOB_RESTART))
return true;
return false;
}
UnitType unit_name_to_type(const char *n) {
UnitType t;
assert(n);
for (t = 0; t < _UNIT_TYPE_MAX; t++)
if (endswith(n, unit_vtable[t]->suffix))
return t;
return _UNIT_TYPE_INVALID;
}
bool unit_name_is_valid(const char *n, bool template_ok) {
UnitType t;
t = unit_name_to_type(n);
if (t < 0 || t >= _UNIT_TYPE_MAX)
return false;
return unit_name_is_valid_no_type(n, template_ok);
}
int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
assert(u);
assert(w >= 0 && w < _KILL_WHO_MAX);
assert(m >= 0 && m < _KILL_MODE_MAX);
assert(signo > 0);
assert(signo < _NSIG);
if (m == KILL_NONE)
return 0;
if (!UNIT_VTABLE(u)->kill)
return -ENOTSUP;
return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
}
int unit_following_set(Unit *u, Set **s) {
assert(u);
assert(s);
if (UNIT_VTABLE(u)->following_set)
return UNIT_VTABLE(u)->following_set(u, s);
*s = NULL;
return 0;
}
UnitFileState unit_get_unit_file_state(Unit *u) {
assert(u);
if (u->meta.unit_file_state < 0 && u->meta.fragment_path)
u->meta.unit_file_state = unit_file_get_state(
u->meta.manager->running_as == MANAGER_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
NULL, file_name_from_path(u->meta.fragment_path));
return u->meta.unit_file_state;
}
static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
[UNIT_STUB] = "stub",
[UNIT_LOADED] = "loaded",
[UNIT_ERROR] = "error",
[UNIT_MERGED] = "merged",
[UNIT_MASKED] = "masked"
};
DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
[UNIT_ACTIVE] = "active",
[UNIT_RELOADING] = "reloading",
[UNIT_INACTIVE] = "inactive",
[UNIT_FAILED] = "failed",
[UNIT_ACTIVATING] = "activating",
[UNIT_DEACTIVATING] = "deactivating"
};
DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
[UNIT_REQUIRES] = "Requires",
[UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
[UNIT_WANTS] = "Wants",
[UNIT_REQUISITE] = "Requisite",
[UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
[UNIT_REQUIRED_BY] = "RequiredBy",
[UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
[UNIT_BIND_TO] = "BindTo",
[UNIT_WANTED_BY] = "WantedBy",
[UNIT_CONFLICTS] = "Conflicts",
[UNIT_CONFLICTED_BY] = "ConflictedBy",
[UNIT_BOUND_BY] = "BoundBy",
[UNIT_BEFORE] = "Before",
[UNIT_AFTER] = "After",
[UNIT_REFERENCES] = "References",
[UNIT_REFERENCED_BY] = "ReferencedBy",
[UNIT_ON_FAILURE] = "OnFailure"
};
DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
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