#include <errno.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/stat.h>

#include "sd-id128.h"

#include "sd-messages.h"

#include "set.h"

#include "macro.h"

#include "strv.h"

#include "path-util.h"

#include "log.h"

#include "cgroup-util.h"

#include "missing.h"

#include "mkdir.h"

#include "fileio-label.h"

#include "formats-util.h"

#include "process-util.h"

#include "virt.h"

#include "bus-common-errors.h"

#include "bus-util.h"

#include "dropin.h"

#include "unit-name.h"

#include "special.h"

#include "unit.h"

#include "load-fragment.h"

#include "load-dropin.h"

#include "dbus.h"

#include "dbus-unit.h"

#include "execute.h"

const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {

[UNIT_SERVICE] = &service_vtable,

[UNIT_SOCKET] = &socket_vtable,

[UNIT_BUSNAME] = &busname_vtable,

[UNIT_TARGET] = &target_vtable,

[UNIT_SNAPSHOT] = &snapshot_vtable,

[UNIT_DEVICE] = &device_vtable,

[UNIT_MOUNT] = &mount_vtable,

[UNIT_AUTOMOUNT] = &automount_vtable,

[UNIT_SWAP] = &swap_vtable,

[UNIT_TIMER] = &timer_vtable,

[UNIT_PATH] = &path_vtable,

[UNIT_SLICE] = &slice_vtable,

[UNIT_SCOPE] = &scope_vtable

};

static void maybe_warn_about_dependency(Unit *u, const char *other, UnitDependency dependency);

Unit *unit_new(Manager *m, size_t size) {

Unit *u;

assert(m);

assert(size >= sizeof(Unit));

u = malloc0(size);

if (!u)

return NULL;

u->names = set_new(&string_hash_ops);

if (!u->names) {

free(u);

return NULL;

}

u->manager = m;

u->type = _UNIT_TYPE_INVALID;

u->default_dependencies = true;

u->unit_file_state = _UNIT_FILE_STATE_INVALID;

u->unit_file_preset = -1;

u->on_failure_job_mode = JOB_REPLACE;

u->cgroup_inotify_wd = -1;

RATELIMIT_INIT(u->auto_stop_ratelimit, 10 * USEC_PER_SEC, 16);

return u;

}

bool unit_has_name(Unit *u, const char *name) {

assert(u);

assert(name);

return !!set_get(u->names, (char*) name);

}

static void unit_init(Unit *u) {

CGroupContext *cc;

ExecContext *ec;

KillContext *kc;

assert(u);

assert(u->manager);

assert(u->type >= 0);

cc = unit_get_cgroup_context(u);

if (cc) {

cgroup_context_init(cc);

/* Copy in the manager defaults into the cgroup

cc->cpu_accounting = u->manager->default_cpu_accounting;

cc->blockio_accounting = u->manager->default_blockio_accounting;

cc->memory_accounting = u->manager->default_memory_accounting;

cc->tasks_accounting = u->manager->default_tasks_accounting;

}

ec = unit_get_exec_context(u);

if (ec)

exec_context_init(ec);

kc = unit_get_kill_context(u);

if (kc)

kill_context_init(kc);

if (UNIT_VTABLE(u)->init)

UNIT_VTABLE(u)->init(u);

}

int unit_add_name(Unit *u, const char *text) {

_cleanup_free_ char *s = NULL, *i = NULL;

UnitType t;

int r;

assert(u);

assert(text);

if (unit_name_is_valid(text, UNIT_NAME_TEMPLATE)) {

if (!u->instance)

return -EINVAL;

r = unit_name_replace_instance(text, u->instance, &s);

if (r < 0)

return r;

} else {

s = strdup(text);

if (!s)

return -ENOMEM;

}

if (set_contains(u->names, s))

return 0;

if (hashmap_contains(u->manager->units, s))

return -EEXIST;

if (!unit_name_is_valid(s, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))

return -EINVAL;

t = unit_name_to_type(s);

if (t < 0)

return -EINVAL;

if (u->type != _UNIT_TYPE_INVALID && t != u->type)

return -EINVAL;

r = unit_name_to_instance(s, &i);

if (r < 0)

return r;

if (i && unit_vtable[t]->no_instances)

return -EINVAL;

/* Ensure that this unit is either instanced or not instanced,

if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i)

return -EINVAL;

if (unit_vtable[t]->no_alias && !set_isempty(u->names))

return -EEXIST;

if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES)

return -E2BIG;

r = set_put(u->names, s);

if (r < 0)

return r;

assert(r > 0);

r = hashmap_put(u->manager->units, s, u);

if (r < 0) {

(void) set_remove(u->names, s);

return r;

}

if (u->type == _UNIT_TYPE_INVALID) {

u->type = t;

u->id = s;

u->instance = i;

LIST_PREPEND(units_by_type, u->manager->units_by_type[t], u);

unit_init(u);

i = NULL;

}

s = NULL;

unit_add_to_dbus_queue(u);

return 0;

}

int unit_choose_id(Unit *u, const char *name) {

_cleanup_free_ char *t = NULL;

char *s, *i;

int r;

assert(u);

assert(name);

if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE)) {

if (!u->instance)

return -EINVAL;

r = unit_name_replace_instance(name, u->instance, &t);

if (r < 0)

return r;

name = t;

}

/* Selects one of the names of this unit as the id */

s = set_get(u->names, (char*) name);

if (!s)

return -ENOENT;

/* Determine the new instance from the new id */

r = unit_name_to_instance(s, &i);

if (r < 0)

return r;

u->id = s;

free(u->instance);

u->instance = i;

unit_add_to_dbus_queue(u);

return 0;

}

int unit_set_description(Unit *u, const char *description) {

char *s;

assert(u);

if (isempty(description))

s = NULL;

else {

s = strdup(description);

if (!s)

return -ENOMEM;

}

free(u->description);

u->description = s;

unit_add_to_dbus_queue(u);

return 0;

}

bool unit_check_gc(Unit *u) {

UnitActiveState state;

assert(u);

if (u->job)

return true;

if (u->nop_job)

return true;

state = unit_active_state(u);

/* If the unit is inactive and failed and no job is queued for

if (UNIT_IS_INACTIVE_OR_FAILED(state) &&

UNIT_VTABLE(u)->release_resources)

UNIT_VTABLE(u)->release_resources(u);

/* But we keep the unit object around for longer when it is

if (state != UNIT_INACTIVE)

return true;

if (UNIT_VTABLE(u)->no_gc)

return true;

if (u->no_gc)

return true;

if (u->refs)

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->type != _UNIT_TYPE_INVALID);

if (u->load_state != UNIT_STUB || u->in_load_queue)

return;

LIST_PREPEND(load_queue, u->manager->load_queue, u);

u->in_load_queue = true;

}

void unit_add_to_cleanup_queue(Unit *u) {

assert(u);

if (u->in_cleanup_queue)

return;

LIST_PREPEND(cleanup_queue, u->manager->cleanup_queue, u);

u->in_cleanup_queue = true;

}

void unit_add_to_gc_queue(Unit *u) {

assert(u);

if (u->in_gc_queue || u->in_cleanup_queue)

return;

if (unit_check_gc(u))

return;

LIST_PREPEND(gc_queue, u->manager->gc_queue, u);

u->in_gc_queue = true;

u->manager->n_in_gc_queue ++;

}

void unit_add_to_dbus_queue(Unit *u) {

assert(u);

assert(u->type != _UNIT_TYPE_INVALID);

if (u->load_state == UNIT_STUB || u->in_dbus_queue)

return;

/* Shortcut things if nobody cares */

if (sd_bus_track_count(u->manager->subscribed) <= 0 &&

set_isempty(u->manager->private_buses)) {

u->sent_dbus_new_signal = true;

return;

}

LIST_PREPEND(dbus_queue, u->manager->dbus_unit_queue, u);

u->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

SET_FOREACH(other, s, i) {

UnitDependency d;

for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)

set_remove(other->dependencies[d], u);

unit_add_to_gc_queue(other);

}

set_free(s);

}

static void unit_remove_transient(Unit *u) {

char **i;

assert(u);

if (!u->transient)

return;

if (u->fragment_path)

(void) unlink(u->fragment_path);

STRV_FOREACH(i, u->dropin_paths) {

_cleanup_free_ char *p = NULL;

int r;

(void) unlink(*i);

r = path_get_parent(*i, &p);

if (r >= 0)

(void) rmdir(p);

}

}

static void unit_free_requires_mounts_for(Unit *u) {

char **j;

STRV_FOREACH(j, u->requires_mounts_for) {

char s[strlen(*j) + 1];

PATH_FOREACH_PREFIX_MORE(s, *j) {

char *y;

Set *x;

x = hashmap_get2(u->manager->units_requiring_mounts_for, s, (void**) &y);

if (!x)

continue;

set_remove(x, u);

if (set_isempty(x)) {

hashmap_remove(u->manager->units_requiring_mounts_for, y);

free(y);

set_free(x);

}

}

}

u->requires_mounts_for = strv_free(u->requires_mounts_for);

}

static void unit_done(Unit *u) {

ExecContext *ec;

CGroupContext *cc;

assert(u);

if (u->type < 0)

return;

if (UNIT_VTABLE(u)->done)

UNIT_VTABLE(u)->done(u);

ec = unit_get_exec_context(u);

if (ec)

exec_context_done(ec);

cc = unit_get_cgroup_context(u);

if (cc)

cgroup_context_done(cc);

}

void unit_free(Unit *u) {

UnitDependency d;

Iterator i;

char *t;

assert(u);

if (u->manager->n_reloading <= 0)

unit_remove_transient(u);

bus_unit_send_removed_signal(u);

unit_done(u);

sd_bus_slot_unref(u->match_bus_slot);

unit_free_requires_mounts_for(u);

SET_FOREACH(t, u->names, i)

hashmap_remove_value(u->manager->units, t, u);

if (u->job) {

Job *j = u->job;

job_uninstall(j);

job_free(j);

}

if (u->nop_job) {

Job *j = u->nop_job;

job_uninstall(j);

job_free(j);

}

for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)

bidi_set_free(u, u->dependencies[d]);

if (u->type != _UNIT_TYPE_INVALID)

LIST_REMOVE(units_by_type, u->manager->units_by_type[u->type], u);

if (u->in_load_queue)

LIST_REMOVE(load_queue, u->manager->load_queue, u);

if (u->in_dbus_queue)

LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);

if (u->in_cleanup_queue)

LIST_REMOVE(cleanup_queue, u->manager->cleanup_queue, u);

if (u->in_gc_queue) {

LIST_REMOVE(gc_queue, u->manager->gc_queue, u);

u->manager->n_in_gc_queue--;

}

if (u->in_cgroup_queue)

LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);

unit_release_cgroup(u);

(void) manager_update_failed_units(u->manager, u, false);

set_remove(u->manager->startup_units, u);

free(u->description);

strv_free(u->documentation);

free(u->fragment_path);

free(u->source_path);

strv_free(u->dropin_paths);

free(u->instance);

free(u->job_timeout_reboot_arg);

set_free_free(u->names);

unit_unwatch_all_pids(u);

condition_free_list(u->conditions);

condition_free_list(u->asserts);

unit_ref_unset(&u->slice);

while (u->refs)

unit_ref_unset(u->refs);

free(u);

}

UnitActiveState unit_active_state(Unit *u) {

assert(u);

if (u->load_state == UNIT_MERGED)

return unit_active_state(unit_follow_merge(u));

/* After a reload it might happen that a unit is not correctly

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 int complete_move(Set **s, Set **other) {

int r;

assert(s);

assert(other);

if (!*other)

return 0;

if (*s) {

r = set_move(*s, *other);

if (r < 0)

return r;

} else {

*s = *other;

*other = NULL;

}

return 0;

}

static int merge_names(Unit *u, Unit *other) {

char *t;

Iterator i;

int r;

assert(u);

assert(other);

r = complete_move(&u->names, &other->names);

if (r < 0)

return r;

set_free_free(other->names);

other->names = NULL;

other->id = NULL;

SET_FOREACH(t, u->names, i)

assert_se(hashmap_replace(u->manager->units, t, u) == 0);

return 0;

}

static int reserve_dependencies(Unit *u, Unit *other, UnitDependency d) {

unsigned n_reserve;

assert(u);

assert(other);

assert(d < _UNIT_DEPENDENCY_MAX);

/*

if (!u->dependencies[d])

return 0;

/* merge_dependencies() will skip a u-on-u dependency */

n_reserve = set_size(other->dependencies[d]) - !!set_get(other->dependencies[d], u);

return set_reserve(u->dependencies[d], n_reserve);

}

static void merge_dependencies(Unit *u, Unit *other, const char *other_id, UnitDependency d) {

Iterator i;

Unit *back;

int r;

assert(u);

assert(other);

assert(d < _UNIT_DEPENDENCY_MAX);

/* Fix backwards pointers */

SET_FOREACH(back, other->dependencies[d], i) {

UnitDependency k;

for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++) {

/* Do not add dependencies between u and itself */

if (back == u) {

if (set_remove(back->dependencies[k], other))

maybe_warn_about_dependency(u, other_id, k);

} else {

r = set_remove_and_put(back->dependencies[k], other, u);

if (r == -EEXIST)

set_remove(back->dependencies[k], other);

else

assert(r >= 0 || r == -ENOENT);

}

}

}

/* Also do not move dependencies on u to itself */

back = set_remove(other->dependencies[d], u);

if (back)

maybe_warn_about_dependency(u, other_id, d);

/* The move cannot fail. The caller must have performed a reservation. */

assert_se(complete_move(&u->dependencies[d], &other->dependencies[d]) == 0);

other->dependencies[d] = set_free(other->dependencies[d]);

}

int unit_merge(Unit *u, Unit *other) {

UnitDependency d;

const char *other_id = NULL;

int r;

assert(u);

assert(other);

assert(u->manager == other->manager);

assert(u->type != _UNIT_TYPE_INVALID);

other = unit_follow_merge(other);

if (other == u)

return 0;

if (u->type != other->type)

return -EINVAL;

if (!u->instance != !other->instance)

return -EINVAL;

if (other->load_state != UNIT_STUB &&

other->load_state != UNIT_NOT_FOUND)

return -EEXIST;

if (other->job)

return -EEXIST;

if (other->nop_job)

return -EEXIST;

if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))

return -EEXIST;

if (other->id)

other_id = strdupa(other->id);

/* Make reservations to ensure merge_dependencies() won't fail */

for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {

r = reserve_dependencies(u, other, d);

/*

if (r < 0)

return r;

}

/* Merge names */

r = merge_names(u, other);

if (r < 0)

return r;

/* Redirect all references */

while (other->refs)

unit_ref_set(other->refs, u);

/* Merge dependencies */

for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)

merge_dependencies(u, other, other_id, d);

other->load_state = UNIT_MERGED;

other->merged_into = u;

/* If there is still some data attached to the other node, we

if (other->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;

_cleanup_free_ char *s = NULL;

assert(u);

assert(name);

if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE)) {

if (!u->instance)

return -EINVAL;

r = unit_name_replace_instance(name, u->instance, &s);

if (r < 0)

return r;

name = s;

}

other = manager_get_unit(u->manager, name);

if (other)

return unit_merge(u, other);

return unit_add_name(u, name);

}

Unit* unit_follow_merge(Unit *u) {

assert(u);

while (u->load_state == UNIT_MERGED)

assert_se(u = u->merged_into);

return u;

}

int unit_add_exec_dependencies(Unit *u, ExecContext *c) {

int r;

assert(u);

assert(c);

if (c->working_directory) {

r = unit_require_mounts_for(u, c->working_directory);

if (r < 0)

return r;

}

if (c->root_directory) {

r = unit_require_mounts_for(u, c->root_directory);

if (r < 0)

return r;

}

if (u->manager->running_as != MANAGER_SYSTEM)

return 0;

if (c->private_tmp) {

r = unit_require_mounts_for(u, "/tmp");

if (r < 0)

return r;

r = unit_require_mounts_for(u, "/var/tmp");

if (r < 0)

return r;

}

if (c->std_output != EXEC_OUTPUT_KMSG &&

c->std_output != EXEC_OUTPUT_SYSLOG &&

c->std_output != EXEC_OUTPUT_JOURNAL &&

c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&

c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&

c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&

c->std_error != EXEC_OUTPUT_KMSG &&

c->std_error != EXEC_OUTPUT_SYSLOG &&

c->std_error != EXEC_OUTPUT_JOURNAL &&

c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&

c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&

c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)

return 0;

/* If syslog or kernel logging is requested, make sure our own

r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true);

if (r < 0)

return r;

return 0;

}

const char *unit_description(Unit *u) {

assert(u);

if (u->description)

return u->description;

return strna(u->id);

}

void unit_dump(Unit *u, FILE *f, const char *prefix) {

char *t, **j;

UnitDependency d;

Iterator i;

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;

_cleanup_set_free_ Set *following_set = NULL;

int r;

assert(u);

assert(u->type >= 0);

prefix = strempty(prefix);

prefix2 = strjoina(prefix, "\t");

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"

"%s\tTransient: %s\n"

"%s\tSlice: %s\n"

"%s\tCGroup: %s\n"

"%s\tCGroup realized: %s\n"

"%s\tCGroup mask: 0x%x\n"

"%s\tCGroup members mask: 0x%x\n",

prefix, u->id,

prefix, unit_description(u),

prefix, strna(u->instance),

prefix, unit_load_state_to_string(u->load_state),

prefix, unit_active_state_to_string(unit_active_state(u)),

prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)),

prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)),

prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)),

prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)),

prefix, yes_no(unit_check_gc(u)),

prefix, yes_no(unit_need_daemon_reload(u)),

prefix, yes_no(u->transient),

prefix, strna(unit_slice_name(u)),

prefix, strna(u->cgroup_path),

prefix, yes_no(u->cgroup_realized),

prefix, u->cgroup_realized_mask,

prefix, u->cgroup_members_mask);

SET_FOREACH(t, u->names, i)

fprintf(f, "%s\tName: %s\n", prefix, t);

STRV_FOREACH(j, u->documentation)

fprintf(f, "%s\tDocumentation: %s\n", prefix, *j);

following = unit_following(u);

if (following)

fprintf(f, "%s\tFollowing: %s\n", prefix, following->id);

r = unit_following_set(u, &following_set);

if (r >= 0) {

Unit *other;

SET_FOREACH(other, following_set, i)

fprintf(f, "%s\tFollowing Set Member: %s\n", prefix, other->id);

}

if (u->fragment_path)

fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path);

if (u->source_path)

fprintf(f, "%s\tSource Path: %s\n", prefix, u->source_path);

STRV_FOREACH(j, u->dropin_paths)

fprintf(f, "%s\tDropIn Path: %s\n", prefix, *j);

if (u->job_timeout > 0)

fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout, 0));

if (u->job_timeout_action != FAILURE_ACTION_NONE)

fprintf(f, "%s\tJob Timeout Action: %s\n", prefix, failure_action_to_string(u->job_timeout_action));

if (u->job_timeout_reboot_arg)

fprintf(f, "%s\tJob Timeout Reboot Argument: %s\n", prefix, u->job_timeout_reboot_arg);

condition_dump_list(u->conditions, f, prefix, condition_type_to_string);

condition_dump_list(u->asserts, f, prefix, assert_type_to_string);

if (dual_timestamp_is_set(&u->condition_timestamp))

fprintf(f,

"%s\tCondition Timestamp: %s\n"

"%s\tCondition Result: %s\n",

prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)),

prefix, yes_no(u->condition_result));

if (dual_timestamp_is_set(&u->assert_timestamp))

fprintf(f,

"%s\tAssert Timestamp: %s\n"

"%s\tAssert Result: %s\n",

prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->assert_timestamp.realtime)),

prefix, yes_no(u->assert_result));

for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {

Unit *other;

SET_FOREACH(other, u->dependencies[d], i)

fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id);

}

if (!strv_isempty(u->requires_mounts_for)) {

fprintf(f,

"%s\tRequiresMountsFor:", prefix);

STRV_FOREACH(j, u->requires_mounts_for)

fprintf(f, " %s", *j);

fputs("\n", f);

}

if (u->load_state == UNIT_LOADED) {

fprintf(f,

"%s\tStopWhenUnneeded: %s\n"

"%s\tRefuseManualStart: %s\n"

"%s\tRefuseManualStop: %s\n"

"%s\tDefaultDependencies: %s\n"

"%s\tOnFailureJobMode: %s\n"

"%s\tIgnoreOnIsolate: %s\n"

"%s\tIgnoreOnSnapshot: %s\n",

prefix, yes_no(u->stop_when_unneeded),

prefix, yes_no(u->refuse_manual_start),

prefix, yes_no(u->refuse_manual_stop),

prefix, yes_no(u->default_dependencies),

prefix, job_mode_to_string(u->on_failure_job_mode),

prefix, yes_no(u->ignore_on_isolate),

prefix, yes_no(u->ignore_on_snapshot));

if (UNIT_VTABLE(u)->dump)

UNIT_VTABLE(u)->dump(u, f, prefix2);

} else if (u->load_state == UNIT_MERGED)

fprintf(f,

"%s\tMerged into: %s\n",

prefix, u->merged_into->id);

else if (u->load_state == UNIT_ERROR)

fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));

if (u->job)

job_dump(u->job, f, prefix2);

if (u->nop_job)

job_dump(u->nop_job, f, prefix2);

}

int unit_load_fragment_and_dropin(Unit *u) {

int r;

assert(u);

/* Load a .{service,socket,...} file */

r = unit_load_fragment(u);

if (r < 0)

return r;

if (u->load_state == UNIT_STUB)

return -ENOENT;

/* Load drop-in directory data */

r = unit_load_dropin(unit_follow_merge(u));

if (r < 0)

return r;

return 0;

}

int unit_load_fragment_and_dropin_optional(Unit *u) {

int r;

assert(u);

/* Same as unit_load_fragment_and_dropin(), but whether

/* Load a .service file */

r = unit_load_fragment(u);

if (r < 0)

return r;

if (u->load_state == UNIT_STUB)

u->load_state = UNIT_LOADED;

/* Load drop-in directory data */

r = unit_load_dropin(unit_follow_merge(u));

if (r < 0)

return r;

return 0;

}

int unit_add_default_target_dependency(Unit *u, Unit *target) {

assert(u);

assert(target);

if (target->type != UNIT_TARGET)

return 0;

/* Only add the dependency if both units are loaded, so that

if (u->load_state != UNIT_LOADED ||

target->load_state != UNIT_LOADED)

return 0;

/* If either side wants no automatic dependencies, then let's

if (!u->default_dependencies ||

!target->default_dependencies)

return 0;

/* Don't create loops */

if (set_get(target->dependencies[UNIT_BEFORE], u))

return 0;

return unit_add_dependency(target, UNIT_AFTER, u, true);

}

static int unit_add_target_dependencies(Unit *u) {

static const UnitDependency deps[] = {

UNIT_REQUIRED_BY,

UNIT_REQUIRED_BY_OVERRIDABLE,

UNIT_REQUISITE_OF,

UNIT_REQUISITE_OF_OVERRIDABLE,

UNIT_WANTED_BY,

UNIT_BOUND_BY

};

Unit *target;

Iterator i;

unsigned k;

int r = 0;

assert(u);

for (k = 0; k < ELEMENTSOF(deps); k++)

SET_FOREACH(target, u->dependencies[deps[k]], i) {

r = unit_add_default_target_dependency(u, target);

if (r < 0)

return r;

}

return r;

}

static int unit_add_slice_dependencies(Unit *u) {

assert(u);

if (!UNIT_HAS_CGROUP_CONTEXT(u))

return 0;

if (UNIT_ISSET(u->slice))

return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, UNIT_DEREF(u->slice), true);

if (streq(u->id, SPECIAL_ROOT_SLICE))

return 0;

return unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, SPECIAL_ROOT_SLICE, NULL, true);

}

static int unit_add_mount_dependencies(Unit *u) {

char **i;

int r;

assert(u);

STRV_FOREACH(i, u->requires_mounts_for) {

char prefix[strlen(*i) + 1];

PATH_FOREACH_PREFIX_MORE(prefix, *i) {

Unit *m;

r = manager_get_unit_by_path(u->manager, prefix, ".mount", &m);

if (r < 0)

return r;

if (r == 0)

continue;

if (m == u)

continue;

if (m->load_state != UNIT_LOADED)

continue;

r = unit_add_dependency(u, UNIT_AFTER, m, true);

if (r < 0)

return r;

if (m->fragment_path) {

r = unit_add_dependency(u, UNIT_REQUIRES, m, true);

if (r < 0)

return r;

}

}

}

return 0;

}

static int unit_add_startup_units(Unit *u) {

CGroupContext *c;

int r;

c = unit_get_cgroup_context(u);

if (!c)

return 0;

if (c->startup_cpu_shares == CGROUP_CPU_SHARES_INVALID &&

c->startup_blockio_weight == CGROUP_BLKIO_WEIGHT_INVALID)

return 0;

r = set_ensure_allocated(&u->manager->startup_units, NULL);

if (r < 0)

return r;

return set_put(u->manager->startup_units, u);

}

int unit_load(Unit *u) {

int r;

assert(u);

if (u->in_load_queue) {

LIST_REMOVE(load_queue, u->manager->load_queue, u);

u->in_load_queue = false;

}

if (u->type == _UNIT_TYPE_INVALID)

return -EINVAL;

if (u->load_state != UNIT_STUB)

return 0;

if (UNIT_VTABLE(u)->load) {

r = UNIT_VTABLE(u)->load(u);

if (r < 0)

goto fail;

}

if (u->load_state == UNIT_STUB) {

r = -ENOENT;

goto fail;

}

if (u->load_state == UNIT_LOADED) {

r = unit_add_target_dependencies(u);

if (r < 0)

goto fail;

r = unit_add_slice_dependencies(u);

if (r < 0)

goto fail;

r = unit_add_mount_dependencies(u);

if (r < 0)

goto fail;

r = unit_add_startup_units(u);

if (r < 0)

goto fail;

if (u->on_failure_job_mode == JOB_ISOLATE && set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) {

log_unit_error(u, "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");

r = -EINVAL;

goto fail;

}

unit_update_cgroup_members_masks(u);

}

assert((u->load_state != UNIT_MERGED) == !u->merged_into);

unit_add_to_dbus_queue(unit_follow_merge(u));

unit_add_to_gc_queue(u);

return 0;

fail:

u->load_state = u->load_state == UNIT_STUB ? UNIT_NOT_FOUND : UNIT_ERROR;

u->load_error = r;

unit_add_to_dbus_queue(u);

unit_add_to_gc_queue(u);

log_unit_debug_errno(u, r, "Failed to load configuration: %m");

return r;

}

static bool unit_condition_test_list(Unit *u, Condition *first, const char *(*to_string)(ConditionType t)) {

Condition *c;

int triggered = -1;

assert(u);

assert(to_string);

/* If the condition list is empty, then it is true */

if (!first)

return true;

/* Otherwise, if all of the non-trigger conditions apply and

LIST_FOREACH(conditions, c, first) {

int r;

r = condition_test(c);

if (r < 0)

log_unit_warning(u,

"Couldn't determine result for %s=%s%s%s, assuming failed: %m",

to_string(c->type),

c->trigger ? "|" : "",

c->negate ? "!" : "",

c->parameter);

else

log_unit_debug(u,

"%s=%s%s%s %s.",

to_string(c->type),

c->trigger ? "|" : "",

c->negate ? "!" : "",

c->parameter,

condition_result_to_string(c->result));

if (!c->trigger && r <= 0)

return false;

if (c->trigger && triggered <= 0)

triggered = r > 0;

}

return triggered != 0;

}

static bool unit_condition_test(Unit *u) {

assert(u);

dual_timestamp_get(&u->condition_timestamp);

u->condition_result = unit_condition_test_list(u, u->conditions, condition_type_to_string);

return u->condition_result;

}

static bool unit_assert_test(Unit *u) {

assert(u);

dual_timestamp_get(&u->assert_timestamp);

u->assert_result = unit_condition_test_list(u, u->asserts, assert_type_to_string);

return u->assert_result;

}

_pure_ static const char* unit_get_status_message_format(Unit *u, JobType t) {

const char *format;

const UnitStatusMessageFormats *format_table;

assert(u);

assert(t == JOB_START || t == JOB_STOP || t == JOB_RELOAD);

if (t != JOB_RELOAD) {

format_table = &UNIT_VTABLE(u)->status_message_formats;

if (format_table) {

format = format_table->starting_stopping[t == JOB_STOP];

if (format)

return format;

}

}

/* Return generic strings */

if (t == JOB_START)

return "Starting %s.";

else if (t == JOB_STOP)

return "Stopping %s.";

else

return "Reloading %s.";

}

static void unit_status_print_starting_stopping(Unit *u, JobType t) {

const char *format;

assert(u);

format = unit_get_status_message_format(u, t);

DISABLE_WARNING_FORMAT_NONLITERAL;

unit_status_printf(u, "", format);

REENABLE_WARNING;

}

static void unit_status_log_starting_stopping_reloading(Unit *u, JobType t) {

const char *format;

char buf[LINE_MAX];

sd_id128_t mid;

assert(u);

if (t != JOB_START && t != JOB_STOP && t != JOB_RELOAD)

return;

if (log_on_console())

return;

/* We log status messages for all units and all operations. */

format = unit_get_status_message_format(u, t);

DISABLE_WARNING_FORMAT_NONLITERAL;

snprintf(buf, sizeof(buf), format, unit_description(u));

REENABLE_WARNING;

mid = t == JOB_START ? SD_MESSAGE_UNIT_STARTING :

t == JOB_STOP ? SD_MESSAGE_UNIT_STOPPING :

SD_MESSAGE_UNIT_RELOADING;

/* Note that we deliberately use LOG_MESSAGE() instead of

log_struct(LOG_INFO,

LOG_MESSAGE_ID(mid),

LOG_UNIT_ID(u),

LOG_MESSAGE("%s", buf),

NULL);

}

void unit_status_emit_starting_stopping_reloading(Unit *u, JobType t) {

unit_status_log_starting_stopping_reloading(u, t);

/* Reload status messages have traditionally not been printed to console. */

if (t != JOB_RELOAD)

unit_status_print_starting_stopping(u, t);

}

int unit_start(Unit *u) {

UnitActiveState state;

Unit *following;

assert(u);

/* Units that aren't loaded cannot be started */

if (u->load_state != UNIT_LOADED)

return -EINVAL;

/* If this is already started, then this will succeed. Note

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

if (state != UNIT_ACTIVATING &&

!unit_condition_test(u)) {

log_unit_debug(u, "Starting requested but condition failed. Not starting unit.");

return -EALREADY;

}

/* If the asserts failed, fail the entire job */

if (state != UNIT_ACTIVATING &&

!unit_assert_test(u)) {

log_unit_notice(u, "Starting requested but asserts failed.");

return -EPROTO;

}

/* Units of types that aren't supported cannot be

if (!unit_supported(u))

return -EOPNOTSUPP;

/* Forward to the main object, if we aren't it. */

following = unit_following(u);

if (following) {

log_unit_debug(u, "Redirecting start request from %s to %s.", u->id, following->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

unit_add_to_dbus_queue(u);

return UNIT_VTABLE(u)->start(u);

}

bool unit_can_start(Unit *u) {

assert(u);

if (u->load_state != UNIT_LOADED)

return false;

if (!unit_supported(u))

return false;

return !!UNIT_VTABLE(u)->start;

}

bool unit_can_isolate(Unit *u) {

assert(u);

return unit_can_start(u) &&

u->allow_isolate;

}

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;

following = unit_following(u);

if (following) {

log_unit_debug(u, "Redirecting stop request from %s to %s.", u->id, following->id);

return unit_stop(following);

}

if (!UNIT_VTABLE(u)->stop)

return -EBADR;

unit_add_to_dbus_queue(u);

return UNIT_VTABLE(u)->stop(u);

}

int unit_reload(Unit *u) {

UnitActiveState state;

Unit *following;

assert(u);

if (u->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) {

log_unit_warning(u, "Unit cannot be reloaded because it is inactive.");

return -ENOEXEC;

}

following = unit_following(u);

if (following) {

log_unit_debug(u, "Redirecting reload request from %s to %s.", u->id, following->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) {

static const UnitDependency needed_dependencies[] = {

UNIT_REQUIRED_BY,

UNIT_REQUIRED_BY_OVERRIDABLE,

UNIT_REQUISITE_OF,

UNIT_REQUISITE_OF_OVERRIDABLE,

UNIT_WANTED_BY,

UNIT_BOUND_BY,

};

Unit *other;

Iterator i;

unsigned j;

int r;

assert(u);

/* If this service shall be shut down when unneeded then do

if (!u->stop_when_unneeded)

return;

if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))

return;

for (j = 0; j < ELEMENTSOF(needed_dependencies); j++)

SET_FOREACH(other, u->dependencies[needed_dependencies[j]], i)

if (unit_active_or_pending(other))

return;

/* If stopping a unit fails continously we might enter a stop

if (!ratelimit_test(&u->auto_stop_ratelimit)) {

log_unit_warning(u, "Unit not needed anymore, but not stopping since we tried this too often recently.");

return;

}

log_unit_info(u, "Unit not needed anymore. Stopping.");

/* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */

r = manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);

if (r < 0)

log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %m");

}

static void unit_check_binds_to(Unit *u) {

bool stop = false;

Unit *other;

Iterator i;

int r;

assert(u);

if (u->job)

return;

if (unit_active_state(u) != UNIT_ACTIVE)

return;

SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i) {

if (other->job)

continue;

if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))

continue;

stop = true;

break;

}

if (!stop)

return;

/* If stopping a unit fails continously we might enter a stop

if (!ratelimit_test(&u->auto_stop_ratelimit)) {

log_unit_warning(u, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other->id);

return;

}

assert(other);

log_unit_info(u, "Unit is bound to inactive unit %s. Stopping, too.", other->id);

/* A unit we need to run is gone. Sniff. Let's stop this. */

r = manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);

if (r < 0)

log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %m");

}

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->dependencies[UNIT_REQUIRES], i)

if (!set_get(u->dependencies[UNIT_AFTER], other) &&

!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))

manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);

SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)

if (!set_get(u->dependencies[UNIT_AFTER], other) &&

!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))

manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);

SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)

if (!set_get(u->dependencies[UNIT_AFTER], other) &&

!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))

manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);

SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)

if (!set_get(u->dependencies[UNIT_AFTER], other) &&

!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))

manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);

SET_FOREACH(other, u->dependencies[UNIT_CONFLICTS], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);

SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

manager_add_job(u->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->dependencies[UNIT_BOUND_BY], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

manager_add_job(u->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->dependencies[UNIT_REQUIRES], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

unit_check_unneeded(other);

SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

unit_check_unneeded(other);

SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

unit_check_unneeded(other);

SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

unit_check_unneeded(other);

SET_FOREACH(other, u->dependencies[UNIT_REQUISITE_OVERRIDABLE], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

unit_check_unneeded(other);

SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)

if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))

unit_check_unneeded(other);

}

void unit_start_on_failure(Unit *u) {

Unit *other;

Iterator i;

assert(u);

if (set_size(u->dependencies[UNIT_ON_FAILURE]) <= 0)

return;

log_unit_info(u, "Triggering OnFailure= dependencies.");

SET_FOREACH(other, u->dependencies[UNIT_ON_FAILURE], i) {

int r;

r = manager_add_job(u->manager, JOB_START, other, u->on_failure_job_mode, true, NULL, NULL);

if (r < 0)

log_unit_error_errno(u, r, "Failed to enqueue OnFailure= job: %m");

}

}

void unit_trigger_notify(Unit *u) {

Unit *other;

Iterator i;

assert(u);

SET_FOREACH(other, u->dependencies[UNIT_TRIGGERED_BY], i)

if (UNIT_VTABLE(other)->trigger_notify)

UNIT_VTABLE(other)->trigger_notify(other, u);

}

void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {

Manager *m;

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,

m = u->manager;

/* Update timestamps for state changes */

if (m->n_reloading <= 0) {

dual_timestamp ts;

dual_timestamp_get(&ts);

if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))

u->inactive_exit_timestamp = ts;

else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))

u->inactive_enter_timestamp = ts;

if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))

u->active_enter_timestamp = ts;

else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))

u->active_exit_timestamp = ts;

}

/* Keep track of failed units */

(void) manager_update_failed_units(u->manager, u, ns == UNIT_FAILED);

/* Make sure the cgroup is always removed when we become inactive */

if (UNIT_IS_INACTIVE_OR_FAILED(ns))

unit_prune_cgroup(u);

/* Note that this doesn't apply to RemainAfterExit services exiting

if (UNIT_IS_INACTIVE_OR_FAILED(os) != UNIT_IS_INACTIVE_OR_FAILED(ns)) {

ExecContext *ec;

ec = unit_get_exec_context(u);

if (ec && exec_context_may_touch_console(ec)) {

if (UNIT_IS_INACTIVE_OR_FAILED(ns)) {

m->n_on_console --;

if (m->n_on_console == 0)

/* unset no_console_output flag, since the console is free */

m->no_console_output = false;

} else

m->n_on_console ++;

}

}

if (u->job) {

unexpected = false;

if (u->job->state == JOB_WAITING)

/* So we reached a different state for this

job_add_to_run_queue(u->job);

/* Let's check whether this state change constitutes a

switch (u->job->type) {

case JOB_START:

case JOB_VERIFY_ACTIVE:

if (UNIT_IS_ACTIVE_OR_RELOADING(ns))

job_finish_and_invalidate(u->job, JOB_DONE, true);

else if (u->job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {

unexpected = true;

if (UNIT_IS_INACTIVE_OR_FAILED(ns))

job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);

}

break;

case JOB_RELOAD:

case JOB_RELOAD_OR_START:

if (u->job->state == JOB_RUNNING) {

if (ns == UNIT_ACTIVE)

job_finish_and_invalidate(u->job, reload_success ? JOB_DONE : JOB_FAILED, true);

else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {

unexpected = true;

if (UNIT_IS_INACTIVE_OR_FAILED(ns))

job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);

}

}

break;

case JOB_STOP:

case JOB_RESTART:

case JOB_TRY_RESTART:

if (UNIT_IS_INACTIVE_OR_FAILED(ns))

job_finish_and_invalidate(u->job, JOB_DONE, true);

else if (u->job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {

unexpected = true;

job_finish_and_invalidate(u->job, JOB_FAILED, true);

}

break;

default:

assert_not_reached("Job type unknown");

}

} else

unexpected = true;

if (m->n_reloading <= 0) {

/* If this state change happened without being

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_INACTIVE_OR_DEACTIVATING(ns))

check_unneeded_dependencies(u);

if (ns != os && ns == UNIT_FAILED) {

log_unit_notice(u, "Unit entered failed state.");

unit_start_on_failure(u);

}

}

/* Some names are special */

if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {

if (unit_has_name(u, SPECIAL_DBUS_SERVICE))

/* The bus might have just become available,

bus_init(m, true);

if (u->type == UNIT_SERVICE &&

!UNIT_IS_ACTIVE_OR_RELOADING(os) &&

m->n_reloading <= 0) {

/* Write audit record if we have just finished starting up */

manager_send_unit_audit(m, u, AUDIT_SERVICE_START, true);

u->in_audit = true;

}

if (!UNIT_IS_ACTIVE_OR_RELOADING(os))

manager_send_unit_plymouth(m, u);

} else {

/* We don't care about D-Bus here, since we'll get an

if (u->type == UNIT_SERVICE &&

UNIT_IS_INACTIVE_OR_FAILED(ns) &&

!UNIT_IS_INACTIVE_OR_FAILED(os) &&

m->n_reloading <= 0) {

/* Hmm, if there was no start record written

if (!u->in_audit) {

manager_send_unit_audit(m, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);

if (ns == UNIT_INACTIVE)

manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, true);

} else

/* Write audit record if we have just finished shutting down */

manager_send_unit_audit(m, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);

u->in_audit = false;

}

}

manager_recheck_journal(m);

unit_trigger_notify(u);

if (u->manager->n_reloading <= 0) {

/* Maybe we finished startup and are now ready for

unit_check_unneeded(u);

/* Maybe we finished startup, but something we needed

unit_check_binds_to(u);

}

unit_add_to_dbus_queue(u);

unit_add_to_gc_queue(u);

}

int unit_watch_pid(Unit *u, pid_t pid) {

int q, r;

assert(u);

assert(pid >= 1);

/* Watch a specific PID. We only support one or two units

r = set_ensure_allocated(&u->pids, NULL);

if (r < 0)

return r;

r = hashmap_ensure_allocated(&u->manager->watch_pids1, NULL);

if (r < 0)

return r;

r = hashmap_put(u->manager->watch_pids1, PID_TO_PTR(pid), u);

if (r == -EEXIST) {

r = hashmap_ensure_allocated(&u->manager->watch_pids2, NULL);

if (r < 0)

return r;

r = hashmap_put(u->manager->watch_pids2, PID_TO_PTR(pid), u);

}

q = set_put(u->pids, PID_TO_PTR(pid));

if (q < 0)

return q;

return r;

}

void unit_unwatch_pid(Unit *u, pid_t pid) {

assert(u);

assert(pid >= 1);

(void) hashmap_remove_value(u->manager->watch_pids1, PID_TO_PTR(pid), u);

(void) hashmap_remove_value(u->manager->watch_pids2, PID_TO_PTR(pid), u);

(void) set_remove(u->pids, PID_TO_PTR(pid));

}

void unit_unwatch_all_pids(Unit *u) {

assert(u);

while (!set_isempty(u->pids))

unit_unwatch_pid(u, PTR_TO_PID(set_first(u->pids)));

u->pids = set_free(u->pids);

}

void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2) {

Iterator i;

void *e;

assert(u);

/* Cleans dead PIDs from our list */

SET_FOREACH(e, u->pids, i) {

pid_t pid = PTR_TO_PID(e);

if (pid == except1 || pid == except2)

continue;

if (!pid_is_unwaited(pid))

unit_unwatch_pid(u, pid);

}

}

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:

case JOB_NOP:

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");

}

}

static void maybe_warn_about_dependency(Unit *u, const char *other, UnitDependency dependency) {

assert(u);

/* Only warn about some unit types */

if (!IN_SET(dependency, UNIT_CONFLICTS, UNIT_CONFLICTED_BY, UNIT_BEFORE, UNIT_AFTER, UNIT_ON_FAILURE, UNIT_TRIGGERS, UNIT_TRIGGERED_BY))

return;

if (streq_ptr(u->id, other))

log_unit_warning(u, "Dependency %s=%s dropped", unit_dependency_to_string(dependency), u->id);

else

log_unit_warning(u, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency), strna(other), u->id);

}

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_REQUISITE_OF,

[UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUISITE_OF_OVERRIDABLE,

[UNIT_BINDS_TO] = UNIT_BOUND_BY,

[UNIT_PART_OF] = UNIT_CONSISTS_OF,

[UNIT_REQUIRED_BY] = UNIT_REQUIRES,

[UNIT_REQUIRED_BY_OVERRIDABLE] = UNIT_REQUIRES_OVERRIDABLE,

[UNIT_REQUISITE_OF] = UNIT_REQUISITE,

[UNIT_REQUISITE_OF_OVERRIDABLE] = UNIT_REQUISITE_OVERRIDABLE,

[UNIT_WANTED_BY] = UNIT_WANTS,

[UNIT_BOUND_BY] = UNIT_BINDS_TO,

[UNIT_CONSISTS_OF] = UNIT_PART_OF,

[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,

[UNIT_TRIGGERS] = UNIT_TRIGGERED_BY,

[UNIT_TRIGGERED_BY] = UNIT_TRIGGERS,

[UNIT_PROPAGATES_RELOAD_TO] = UNIT_RELOAD_PROPAGATED_FROM,

[UNIT_RELOAD_PROPAGATED_FROM] = UNIT_PROPAGATES_RELOAD_TO,

[UNIT_JOINS_NAMESPACE_OF] = UNIT_JOINS_NAMESPACE_OF,

};

int r, q = 0, v = 0, w = 0;

Unit *orig_u = u, *orig_other = other;

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

if (u == other) {

maybe_warn_about_dependency(orig_u, orig_other->id, d);

return 0;

}

r = set_ensure_allocated(&u->dependencies[d], NULL);

if (r < 0)

return r;

if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID) {

r = set_ensure_allocated(&other->dependencies[inverse_table[d]], NULL);

if (r < 0)

return r;

}

if (add_reference) {

r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], NULL);

if (r < 0)

return r;

r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], NULL);

if (r < 0)

return r;

}

q = set_put(u->dependencies[d], other);

if (q < 0)

return q;

if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID && inverse_table[d] != d) {

v = set_put(other->dependencies[inverse_table[d]], u);

if (v < 0) {

r = v;

goto fail;

}

}

if (add_reference) {

w = set_put(u->dependencies[UNIT_REFERENCES], other);

if (w < 0) {

r = w;

goto fail;

}

r = set_put(other->dependencies[UNIT_REFERENCED_BY], u);

if (r < 0)

goto fail;

}

unit_add_to_dbus_queue(u);

return 0;

fail:

if (q > 0)

set_remove(u->dependencies[d], other);

if (v > 0)

set_remove(other->dependencies[inverse_table[d]], u);

if (w > 0)

set_remove(u->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);

r = unit_add_dependency(u, d, other, add_reference);

if (r < 0)

return r;

return unit_add_dependency(u, e, other, add_reference);

}

static int resolve_template(Unit *u, const char *name, const char*path, char **buf, const char **ret) {

int r;

assert(u);

assert(name || path);

assert(buf);

assert(ret);

if (!name)

name = basename(path);

if (!unit_name_is_valid(name, UNIT_NAME_TEMPLATE)) {

*buf = NULL;

*ret = name;

return 0;

}

if (u->instance)

r = unit_name_replace_instance(name, u->instance, buf);

else {

_cleanup_free_ char *i = NULL;

r = unit_name_to_prefix(u->id, &i);

if (r < 0)

return r;

r = unit_name_replace_instance(name, i, buf);

}

if (r < 0)

return r;

*ret = *buf;

return 0;

}

int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {

_cleanup_free_ char *buf = NULL;

Unit *other;

int r;

assert(u);

assert(name || path);

r = resolve_template(u, name, path, &buf, &name);

if (r < 0)

return r;

r = manager_load_unit(u->manager, name, path, NULL, &other);

if (r < 0)

return r;

return unit_add_dependency(u, d, other, add_reference);

}

int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {

_cleanup_free_ char *buf = NULL;

Unit *other;

int r;

assert(u);

assert(name || path);

r = resolve_template(u, name, path, &buf, &name);

if (r < 0)

return r;

r = manager_load_unit(u->manager, name, path, NULL, &other);

if (r < 0)

return r;

return unit_add_two_dependencies(u, d, e, other, add_reference);

}

int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {

_cleanup_free_ char *buf = NULL;

Unit *other;

int r;

assert(u);

assert(name || path);

r = resolve_template(u, name, path, &buf, &name);

if (r < 0)

return r;

r = manager_load_unit(u->manager, name, path, NULL, &other);

if (r < 0)

return r;

return unit_add_dependency(other, d, u, add_reference);

}

int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {

_cleanup_free_ char *buf = NULL;

Unit *other;

int r;

assert(u);

assert(name || path);

r = resolve_template(u, name, path, &buf, &name);

if (r < 0)

return r;

r = manager_load_unit(u->manager, name, path, NULL, &other);

if (r < 0)

return r;

return unit_add_two_dependencies(other, d, e, u, add_reference);

}

int set_unit_path(const char *p) {

/* This is mostly for debug purposes */

if (setenv("SYSTEMD_UNIT_PATH", p, 0) < 0)

return -errno;

return 0;

}

char *unit_dbus_path(Unit *u) {

assert(u);

if (!u->id)

return NULL;

return unit_dbus_path_from_name(u->id);

}

int unit_set_slice(Unit *u, Unit *slice) {

assert(u);

assert(slice);

/* Sets the unit slice if it has not been set before. Is extra

if (!UNIT_HAS_CGROUP_CONTEXT(u))

return -EOPNOTSUPP;

if (u->type == UNIT_SLICE)

return -EINVAL;

if (unit_active_state(u) != UNIT_INACTIVE)

return -EBUSY;

if (slice->type != UNIT_SLICE)

return -EINVAL;

if (unit_has_name(u, SPECIAL_INIT_SCOPE) &&

!unit_has_name(slice, SPECIAL_ROOT_SLICE))

return -EPERM;

if (UNIT_DEREF(u->slice) == slice)

return 0;

if (UNIT_ISSET(u->slice))

return -EBUSY;

unit_ref_set(&u->slice, slice);

return 1;

}

int unit_set_default_slice(Unit *u) {

_cleanup_free_ char *b = NULL;

const char *slice_name;

Unit *slice;

int r;

assert(u);

if (UNIT_ISSET(u->slice))

return 0;

if (u->instance) {

_cleanup_free_ char *prefix = NULL, *escaped = NULL;

/* Implicitly place all instantiated units in their

r = unit_name_to_prefix(u->id, &prefix);

if (r < 0)

return r;

/* The prefix is already escaped, but it might include

escaped = unit_name_escape(prefix);

if (!escaped)

return -ENOMEM;

if (u->manager->running_as == MANAGER_SYSTEM)

b = strjoin("system-", escaped, ".slice", NULL);

else

b = strappend(escaped, ".slice");

if (!b)

return -ENOMEM;

slice_name = b;

} else

slice_name =

u->manager->running_as == MANAGER_SYSTEM && !unit_has_name(u, SPECIAL_INIT_SCOPE)

? SPECIAL_SYSTEM_SLICE

: SPECIAL_ROOT_SLICE;

r = manager_load_unit(u->manager, slice_name, NULL, NULL, &slice);

if (r < 0)

return r;

return unit_set_slice(u, slice);

}

const char *unit_slice_name(Unit *u) {

assert(u);

if (!UNIT_ISSET(u->slice))

return NULL;

return UNIT_DEREF(u->slice)->id;

}

int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {

_cleanup_free_ char *t = NULL;

int r;

assert(u);

assert(type);

assert(_found);

r = unit_name_change_suffix(u->id, type, &t);

if (r < 0)

return r;

if (unit_has_name(u, t))

return -EINVAL;

r = manager_load_unit(u->manager, t, NULL, NULL, _found);

assert(r < 0 || *_found != u);

return r;

}

static int signal_name_owner_changed(sd_bus_message *message, void *userdata, sd_bus_error *error) {

const char *name, *old_owner, *new_owner;

Unit *u = userdata;

int r;

assert(message);

assert(u);

r = sd_bus_message_read(message, "sss", &name, &old_owner, &new_owner);

if (r < 0) {

bus_log_parse_error(r);

return 0;

}

if (UNIT_VTABLE(u)->bus_name_owner_change)

UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);

return 0;

}

int unit_install_bus_match(sd_bus *bus, Unit *u, const char *name) {

_cleanup_free_ char *match = NULL;

Manager *m = u->manager;

assert(m);

if (u->match_bus_slot)

return -EBUSY;

match = strjoin("type='signal',"

"sender='org.freedesktop.DBus',"

"path='/org/freedesktop/DBus',"

"interface='org.freedesktop.DBus',"

"member='NameOwnerChanged',"

"arg0='",

name,

"'",

NULL);

if (!match)

return -ENOMEM;

return sd_bus_add_match(bus, &u->match_bus_slot, match, signal_name_owner_changed, u);

}

int unit_watch_bus_name(Unit *u, const char *name) {

int r;

assert(u);

assert(name);

/* Watch a specific name on the bus. We only support one unit

if (u->manager->api_bus) {

/* If the bus is already available, install the match directly.

r = unit_install_bus_match(u->manager->api_bus, u, name);

if (r < 0)

return log_warning_errno(r, "Failed to subscribe to NameOwnerChanged signal: %m");

}

r = hashmap_put(u->manager->watch_bus, name, u);

if (r < 0) {

u->match_bus_slot = sd_bus_slot_unref(u->match_bus_slot);

return log_warning_errno(r, "Failed to put bus name to hashmap: %m");

}

return 0;

}

void unit_unwatch_bus_name(Unit *u, const char *name) {

assert(u);

assert(name);

hashmap_remove_value(u->manager->watch_bus, name, u);

u->match_bus_slot = sd_bus_slot_unref(u->match_bus_slot);

}

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, bool serialize_jobs) {

int r;

assert(u);

assert(f);

assert(fds);

if (unit_can_serialize(u)) {

ExecRuntime *rt;

r = UNIT_VTABLE(u)->serialize(u, f, fds);

if (r < 0)

return r;

rt = unit_get_exec_runtime(u);

if (rt) {

r = exec_runtime_serialize(u, rt, f, fds);

if (r < 0)

return r;

}

}

dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->inactive_exit_timestamp);

dual_timestamp_serialize(f, "active-enter-timestamp", &u->active_enter_timestamp);

dual_timestamp_serialize(f, "active-exit-timestamp", &u->active_exit_timestamp);

dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->inactive_enter_timestamp);

dual_timestamp_serialize(f, "condition-timestamp", &u->condition_timestamp);

dual_timestamp_serialize(f, "assert-timestamp", &u->assert_timestamp);

if (dual_timestamp_is_set(&u->condition_timestamp))

unit_serialize_item(u, f, "condition-result", yes_no(u->condition_result));

if (dual_timestamp_is_set(&u->assert_timestamp))

unit_serialize_item(u, f, "assert-result", yes_no(u->assert_result));

unit_serialize_item(u, f, "transient", yes_no(u->transient));

unit_serialize_item_format(u, f, "cpuacct-usage-base", "%" PRIu64, u->cpuacct_usage_base);

if (u->cgroup_path)

unit_serialize_item(u, f, "cgroup", u->cgroup_path);

unit_serialize_item(u, f, "cgroup-realized", yes_no(u->cgroup_realized));

if (serialize_jobs) {

if (u->job) {

fprintf(f, "job\n");

job_serialize(u->job, f, fds);

}

if (u->nop_job) {

fprintf(f, "job\n");

job_serialize(u->nop_job, f, fds);

}

}

/* 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) {

ExecRuntime **rt = NULL;

size_t offset;

int r;

assert(u);

assert(f);

assert(fds);

offset = UNIT_VTABLE(u)->exec_runtime_offset;

if (offset > 0)

rt = (ExecRuntime**) ((uint8_t*) u + offset);

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 (isempty(l))

return 0;

k = strcspn(l, "=");

if (l[k] == '=') {

l[k] = 0;

v = l+k+1;

} else

v = l+k;

if (streq(l, "job")) {

if (v[0] == '\0') {

/* new-style serialized job */

Job *j;

j = job_new_raw(u);

if (!j)

return log_oom();

r = job_deserialize(j, f, fds);

if (r < 0) {

job_free(j);

return r;

}

r = hashmap_put(u->manager->jobs, UINT32_TO_PTR(j->id), j);

if (r < 0) {

job_free(j);

return r;

}

r = job_install_deserialized(j);

if (r < 0) {

hashmap_remove(u->manager->jobs, UINT32_TO_PTR(j->id));

job_free(j);

return r;

}

} else /* legacy for pre-44 */

log_unit_warning(u, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v);

continue;

} else if (streq(l, "inactive-exit-timestamp")) {

dual_timestamp_deserialize(v, &u->inactive_exit_timestamp);

continue;

} else if (streq(l, "active-enter-timestamp")) {

dual_timestamp_deserialize(v, &u->active_enter_timestamp);

continue;

} else if (streq(l, "active-exit-timestamp")) {

dual_timestamp_deserialize(v, &u->active_exit_timestamp);

continue;

} else if (streq(l, "inactive-enter-timestamp")) {

dual_timestamp_deserialize(v, &u->inactive_enter_timestamp);

continue;

} else if (streq(l, "condition-timestamp")) {

dual_timestamp_deserialize(v, &u->condition_timestamp);

continue;

} else if (streq(l, "assert-timestamp")) {

dual_timestamp_deserialize(v, &u->assert_timestamp);

continue;

} else if (streq(l, "condition-result")) {

r = parse_boolean(v);

if (r < 0)

log_unit_debug(u, "Failed to parse condition result value %s, ignoring.", v);

else

u->condition_result = r;

continue;

} else if (streq(l, "assert-result")) {

r = parse_boolean(v);

if (r < 0)

log_unit_debug(u, "Failed to parse assert result value %s, ignoring.", v);

else

u->assert_result = r;

continue;

} else if (streq(l, "transient")) {

r = parse_boolean(v);

if (r < 0)

log_unit_debug(u, "Failed to parse transient bool %s, ignoring.", v);

else

u->transient = r;

continue;

} else if (streq(l, "cpuacct-usage-base")) {

r = safe_atou64(v, &u->cpuacct_usage_base);

if (r < 0)

log_unit_debug(u, "Failed to parse CPU usage %s, ignoring.", v);

continue;

} else if (streq(l, "cgroup")) {

r = unit_set_cgroup_path(u, v);

if (r < 0)

log_unit_debug_errno(u, r, "Failed to set cgroup path %s, ignoring: %m", v);

(void) unit_watch_cgroup(u);

continue;

} else if (streq(l, "cgroup-realized")) {

int b;

b = parse_boolean(v);

if (b < 0)

log_unit_debug(u, "Failed to parse cgroup-realized bool %s, ignoring.", v);

else

u->cgroup_realized = b;

continue;

}

if (unit_can_serialize(u)) {

if (rt) {

r = exec_runtime_deserialize_item(u, rt, l, v, fds);

if (r < 0) {

log_unit_warning(u, "Failed to deserialize runtime parameter '%s', ignoring.", l);

continue;

}

/* Returns positive if key was handled by the call */

if (r > 0)

continue;

}

r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds);

if (r < 0)

log_unit_warning(u, "Failed to deserialize unit parameter '%s', ignoring.", l);

}

}

}

int unit_add_node_link(Unit *u, const char *what, bool wants) {

Unit *device;

_cleanup_free_ char *e = NULL;

int r;

assert(u);

/* Adds in links to the device node that this unit is based on */

if (isempty(what))

return 0;

if (!is_device_path(what))

return 0;

/* When device units aren't supported (such as in a

if (!unit_type_supported(UNIT_DEVICE))

return 0;

r = unit_name_from_path(what, ".device", &e);

if (r < 0)

return r;

r = manager_load_unit(u->manager, e, NULL, NULL, &device);

if (r < 0)

return r;

r = unit_add_two_dependencies(u, UNIT_AFTER, u->manager->running_as == MANAGER_SYSTEM ? UNIT_BINDS_TO : UNIT_WANTS, device, true);

if (r < 0)

return r;

if (wants) {

r = unit_add_dependency(device, UNIT_WANTS, u, false);

if (r < 0)

return r;

}

return 0;

}

int unit_coldplug(Unit *u) {

int r;

assert(u);

/* Make sure we don't enter a loop, when coldplugging

if (u->coldplugged)

return 0;

u->coldplugged = true;

if (UNIT_VTABLE(u)->coldplug) {

r = UNIT_VTABLE(u)->coldplug(u);

if (r < 0)

return r;

}

if (u->job) {

r = job_coldplug(u->job);

if (r < 0)

return r;

}

return 0;

}

void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) {

DISABLE_WARNING_FORMAT_NONLITERAL;

manager_status_printf(u->manager, STATUS_TYPE_NORMAL,

status, unit_status_msg_format, unit_description(u));

REENABLE_WARNING;

}

bool unit_need_daemon_reload(Unit *u) {

_cleanup_strv_free_ char **t = NULL;

char **path;

struct stat st;

unsigned loaded_cnt, current_cnt;

assert(u);

if (u->fragment_path) {

zero(st);

if (stat(u->fragment_path, &st) < 0)

/* What, cannot access this anymore? */

return true;

if (u->fragment_mtime > 0 &&

timespec_load(&st.st_mtim) != u->fragment_mtime)

return true;

}

if (u->source_path) {

zero(st);

if (stat(u->source_path, &st) < 0)

return true;

if (u->source_mtime > 0 &&

timespec_load(&st.st_mtim) != u->source_mtime)

return true;

}

(void) unit_find_dropin_paths(u, &t);

loaded_cnt = strv_length(t);

current_cnt = strv_length(u->dropin_paths);

if (loaded_cnt == current_cnt) {

if (loaded_cnt == 0)

return false;

if (strv_overlap(u->dropin_paths, t)) {

STRV_FOREACH(path, u->dropin_paths) {

zero(st);

if (stat(*path, &st) < 0)

return true;

if (u->dropin_mtime > 0 &&

timespec_load(&st.st_mtim) > u->dropin_mtime)

return true;

}

return false;

} else

return true;

} else

return true;

}

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_stop_pending(Unit *u) {

assert(u);

/* This call does check the current state of the unit. It's

return u->job && u->job->type == JOB_STOP;

}

bool unit_inactive_or_pending(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 (unit_stop_pending(u))

return true;

return false;

}

bool unit_active_or_pending(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->job &&

(u->job->type == JOB_START ||

u->job->type == JOB_RELOAD_OR_START ||

u->job->type == JOB_RESTART))

return true;

return false;

}

int unit_kill(Unit *u, KillWho w, int signo, sd_bus_error *error) {

assert(u);

assert(w >= 0 && w < _KILL_WHO_MAX);

assert(signo > 0);

assert(signo < _NSIG);

if (!UNIT_VTABLE(u)->kill)

return -EOPNOTSUPP;

return UNIT_VTABLE(u)->kill(u, w, signo, error);

}

static Set *unit_pid_set(pid_t main_pid, pid_t control_pid) {

Set *pid_set;

int r;

pid_set = set_new(NULL);

if (!pid_set)

return NULL;

/* Exclude the main/control pids from being killed via the cgroup */

if (main_pid > 0) {

r = set_put(pid_set, PID_TO_PTR(main_pid));

if (r < 0)

goto fail;

}

if (control_pid > 0) {

r = set_put(pid_set, PID_TO_PTR(control_pid));

if (r < 0)

goto fail;

}

return pid_set;

fail:

set_free(pid_set);

return NULL;

}

int unit_kill_common(

Unit *u,

KillWho who,

int signo,

pid_t main_pid,

pid_t control_pid,

sd_bus_error *error) {

int r = 0;

if (who == KILL_MAIN) {

if (main_pid < 0)

return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_PROCESS, "%s units have no main processes", unit_type_to_string(u->type));

else if (main_pid == 0)

return sd_bus_error_set_const(error, BUS_ERROR_NO_SUCH_PROCESS, "No main process to kill");

}

if (who == KILL_CONTROL) {

if (control_pid < 0)

return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_PROCESS, "%s units have no control processes", unit_type_to_string(u->type));

else if (control_pid == 0)

return sd_bus_error_set_const(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");

}

if (who == KILL_CONTROL || who == KILL_ALL)

if (control_pid > 0)

if (kill(control_pid, signo) < 0)

r = -errno;

if (who == KILL_MAIN || who == KILL_ALL)

if (main_pid > 0)

if (kill(main_pid, signo) < 0)

r = -errno;

if (who == KILL_ALL && u->cgroup_path) {

_cleanup_set_free_ Set *pid_set = NULL;

int q;

/* Exclude the main/control pids from being killed via the cgroup */

pid_set = unit_pid_set(main_pid, control_pid);

if (!pid_set)

return -ENOMEM;

q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, signo, false, false, false, pid_set);

if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT)

r = q;

}

return r;

}

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) {