#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 "path-util.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, size_t size) {

Unit *u;

assert(m);

assert(size >= sizeof(Unit));

u = malloc0(size);

if (!u)

return NULL;

u->names = set_new(string_hash_func, string_compare_func);

if (!u->names) {

free(u);

return NULL;

}

u->manager = m;

u->type = _UNIT_TYPE_INVALID;

u->deserialized_job = _JOB_TYPE_INVALID;

u->default_dependencies = true;

u->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->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->instance)

return -EINVAL;

s = unit_name_replace_instance(text, u->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->type != _UNIT_TYPE_INVALID && t != u->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,

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

r = -EINVAL;

goto fail;

}

if (unit_vtable[t]->no_alias &&

!set_isempty(u->names) &&

!set_get(u->names, s)) {

r = -EEXIST;

goto fail;

}

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

r = -E2BIG;

goto fail;

}

if ((r = set_put(u->names, s)) < 0) {

if (r == -EEXIST)

r = 0;

goto fail;

}

if ((r = hashmap_put(u->manager->units, s, u)) < 0) {

set_remove(u->names, s);

goto fail;

}

if (u->type == _UNIT_TYPE_INVALID) {

u->type = t;

u->id = s;

u->instance = i;

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

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->instance)

return -EINVAL;

if (!(t = unit_name_replace_instance(name, u->instance)))

return -ENOMEM;

name = t;

}

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

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

free(t);

if (!s)

return -ENOENT;

if ((r = unit_name_to_instance(s, &i)) < 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 (!(s = strdup(description)))

return -ENOMEM;

free(u->description);

u->description = s;

unit_add_to_dbus_queue(u);

return 0;

}

bool unit_check_gc(Unit *u) {

assert(u);

if (u->load_state == UNIT_STUB)

return true;

if (UNIT_VTABLE(u)->no_gc)

return true;

if (u->no_gc)

return true;

if (u->job)

return true;

if (u->nop_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->type != _UNIT_TYPE_INVALID);

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

return;

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

u->in_gc_queue = true;

u->manager->n_in_gc_queue ++;

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

u->manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);

}

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 (!bus_has_subscriber(u->manager)) {

u->sent_dbus_new_signal = true;

return;

}

LIST_PREPEND(Unit, 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);

}

void unit_free(Unit *u) {

UnitDependency d;

Iterator i;

char *t;

assert(u);

bus_unit_send_removed_signal(u);

if (u->load_state != UNIT_STUB)

if (UNIT_VTABLE(u)->done)

UNIT_VTABLE(u)->done(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->requires_mounts_for) {

LIST_REMOVE(Unit, has_requires_mounts_for, u->manager->has_requires_mounts_for, u);

strv_free(u->requires_mounts_for);

}

if (u->type != _UNIT_TYPE_INVALID)

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

if (u->in_load_queue)

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

if (u->in_dbus_queue)

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

if (u->in_cleanup_queue)

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

if (u->in_gc_queue) {

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

u->manager->n_in_gc_queue--;

}

cgroup_bonding_free_list(u->cgroup_bondings, u->manager->n_reloading <= 0);

cgroup_attribute_free_list(u->cgroup_attributes);

free(u->description);

strv_free(u->documentation);

free(u->fragment_path);

free(u->source_path);

free(u->instance);

set_free_free(u->names);

condition_free_list(u->conditions);

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 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->names, &other->names);

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);

}

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->dependencies[d], i) {

UnitDependency k;

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

if ((r = set_remove_and_put(back->dependencies[k], other, u)) < 0) {

if (r == -EEXIST)

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

else

assert(r == -ENOENT);

}

}

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

set_free(other->dependencies[d]);

other->dependencies[d] = NULL;

}

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

UnitDependency d;

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_ERROR)

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;

/* Merge names */

merge_names(u, other);

/* 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, 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;

char *s = NULL;

assert(u);

assert(name);

if (unit_name_is_template(name)) {

if (!u->instance)

return -EINVAL;

if (!(s = unit_name_replace_instance(name, u->instance)))

return -ENOMEM;

name = s;

}

if (!(other = manager_get_unit(u->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->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->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

if (u->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->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;

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->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->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)));

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);

if ((following = unit_following(u)))

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

if (u->job_timeout > 0)

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

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

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));

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) {

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->stop_when_unneeded),

prefix, yes_no(u->refuse_manual_start),

prefix, yes_no(u->refuse_manual_stop),

prefix, yes_no(u->default_dependencies),

prefix, yes_no(u->on_failure_isolate),

prefix, yes_no(u->ignore_on_isolate),

prefix, yes_no(u->ignore_on_snapshot));

LIST_FOREACH(by_unit, b, u->cgroup_bondings)

fprintf(f, "%s\tControlGroup: %s:%s\n",

prefix, b->controller, b->path);

LIST_FOREACH(by_unit, a, u->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->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);

free(p2);

}

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->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;

}

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 */

if ((r = unit_load_fragment(u)) < 0)

return r;

if (u->load_state == UNIT_STUB)

u->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->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_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->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->in_load_queue) {

LIST_REMOVE(Unit, 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)

if ((r = UNIT_VTABLE(u)->load(u)) < 0)

goto fail;

if (u->load_state == UNIT_STUB) {

r = -ENOENT;

goto fail;

}

if (u->load_state == UNIT_LOADED &&

u->default_dependencies)

if ((r = unit_add_default_dependencies(u)) < 0)

goto fail;

if (u->load_state == UNIT_LOADED) {

r = unit_add_mount_links(u);

if (r < 0)

return r;

}

if (u->on_failure_isolate &&

set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) {

log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",

u->id);

r = -EINVAL;

goto fail;

}

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 = UNIT_ERROR;

u->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->id, strerror(-r));

return r;

}

bool unit_condition_test(Unit *u) {

assert(u);

dual_timestamp_get(&u->condition_timestamp);

u->condition_result = condition_test_list(u->conditions);

return u->condition_result;

}

static void unit_status_print_starting_stopping(Unit *u, bool stopping) {

const UnitStatusMessageFormats *format_table;

const char *format;

format_table = &UNIT_VTABLE(u)->status_message_formats;

if (!format_table)

return;

format = format_table->starting_stopping[stopping];

if (!format)

return;

unit_status_printf(u, "", format, unit_description(u));

}

int unit_start(Unit *u) {

UnitActiveState state;

Unit *following;

assert(u);

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_debug("Starting of %s requested but condition failed. Ignoring.", u->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->id, following->id);

return unit_start(following);

}

unit_status_print_starting_stopping(u, false);

/* 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);

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;

if ((following = unit_following(u))) {

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

return unit_stop(following);

}

unit_status_print_starting_stopping(u, true);

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)

return -ENOEXEC;

if ((following = unit_following(u))) {

log_debug("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) {

Iterator i;

Unit *other;

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;

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

if (unit_pending_active(other))

return;

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

if (unit_pending_active(other))

return;

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

if (unit_pending_active(other))

return;

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

if (unit_pending_active(other))

return;

log_info("Service %s is not needed anymore. Stopping.", u->id);

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

manager_add_job(u->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->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_REQUISITE], 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_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_trigger_on_failure(Unit *u) {

Unit *other;

Iterator i;

assert(u);

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

return;

log_info("Triggering OnFailure= dependencies of %s.", u->id);

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

int r;

if ((r = manager_add_job(u->manager, JOB_START, other, u->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,

if (u->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->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;

timer_unit_notify(u, ns);

path_unit_notify(u, ns);

}

if (UNIT_IS_INACTIVE_OR_FAILED(ns))

cgroup_bonding_trim_list(u->cgroup_bondings, true);

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 (u->manager->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_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->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,

bus_init(u->manager, true);

if (u->type == UNIT_SERVICE &&

!UNIT_IS_ACTIVE_OR_RELOADING(os) &&

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

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

manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_START, true);

u->in_audit = true;

}

if (!UNIT_IS_ACTIVE_OR_RELOADING(os))

manager_send_unit_plymouth(u->manager, 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) &&

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

/* Hmm, if there was no start record written

if (!u->in_audit) {

manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);

if (ns == UNIT_INACTIVE)

manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_STOP, true);

} else

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

manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);

u->in_audit = false;

}

}

manager_recheck_journal(u->manager);

/* Maybe we finished startup and are now ready for being

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->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->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

return hashmap_put(u->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->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

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->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->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:

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");

}

}

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_BINDS_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_BINDS_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,

[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

};

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

if (u == other)

return 0;

if ((r = set_ensure_allocated(&u->dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)

return r;

if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)

if ((r = set_ensure_allocated(&other->dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)

return r;

if (add_reference)

if ((r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||

(r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)

return r;

if ((q = set_put(u->dependencies[d], other)) < 0)

return q;

if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)

if ((v = set_put(other->dependencies[inverse_table[d]], u)) < 0) {

r = v;

goto fail;

}

if (add_reference) {

if ((w = set_put(u->dependencies[UNIT_REFERENCES], other)) < 0) {

r = w;

goto fail;

}

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

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 = path_get_file_name(path);

if (!unit_name_is_template(name)) {

*p = NULL;

return name;

}

if (u->instance)

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

else {

char *i;

if (!(i = unit_name_to_prefix(u->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->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->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->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->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) {

assert(u);

if (!u->id)

return NULL;

return unit_dbus_path_from_name(u->id);

}

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->manager->cgroup_bondings, b->path);

LIST_PREPEND(CGroupBonding, by_path, l, b);

if ((r = hashmap_replace(u->manager->cgroup_bondings, b->path, l)) < 0) {

LIST_REMOVE(CGroupBonding, by_path, l, b);

return r;

}

}

LIST_PREPEND(CGroupBonding, by_unit, u->cgroup_bondings, b);

b->unit = u;

return 0;

}

static char *default_cgroup_path(Unit *u) {

char *p;

assert(u);

if (u->instance) {

char *t;

t = unit_name_template(u->id);

if (!t)

return NULL;

p = strjoin(u->manager->cgroup_hierarchy, "/", t, "/", u->instance, NULL);

free(t);

} else

p = strjoin(u->manager->cgroup_hierarchy, "/", u->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->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->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

if (!u->manager->cgroup_hierarchy)

return 0;

if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)

return r;

STRV_FOREACH(c, u->manager->default_controllers)

unit_add_one_default_cgroup(u, *c);

LIST_FOREACH(by_unit, a, u->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->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->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->id, type)))

return -ENOMEM;

assert(!unit_has_name(u, t));

r = manager_load_unit(u->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->id, type)))

return -ENOMEM;

assert(!unit_has_name(u, t));

found = manager_get_unit(u->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->id);

}

static char *specifier_prefix(char specifier, void *data, void *userdata) {

Unit *u = userdata;

assert(u);

return unit_name_to_prefix(u->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->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->instance)

return unit_name_unescape(u->instance);

return strdup("");

}

static char *specifier_filename(char specifier, void *data, void *userdata) {

Unit *u = userdata;

assert(u);

if (u->instance)

return unit_name_path_unescape(u->instance);

return unit_name_to_path(u->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->manager->cgroup_hierarchy);

if (path_get_parent(u->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->manager->running_as == MANAGER_USER) {

const char *e;

e = getenv("XDG_RUNTIME_DIR");

if (e)

return strdup(e);

}

return strdup("/run");

}

static char *specifier_user_name(char specifier, void *data, void *userdata) {

Service *s = userdata;

int r;

const char *username;

/* get USER env from our own env if set */

if (!s->exec_context.user)

return getusername_malloc();

/* fish username from passwd */

username = s->exec_context.user;

r = get_user_creds(&username, NULL, NULL, NULL, NULL);

if (r < 0)

return NULL;

return strdup(username);

}

static char *specifier_user_home(char specifier, void *data, void *userdata) {

Service *s = userdata;

int r;

const char *username, *home;

/* return HOME if set, otherwise from passwd */

if (!s->exec_context.user) {

char *h;

r = get_home_dir(&h);

if (r < 0)

return NULL;

return h;

}

username = s->exec_context.user;

r = get_user_creds(&username, NULL, NULL, &home, NULL);

if (r < 0)

return NULL;

return strdup(home);

}

static char *specifier_user_shell(char specifier, void *data, void *userdata) {

Service *s = userdata;

int r;

const char *username, *shell;

/* return HOME if set, otherwise from passwd */

if (!s->exec_context.user) {

char *sh;

r = get_shell(&sh);

if (r < 0)

return strdup("/bin/sh");

return sh;

}

username = s->exec_context.user;

r = get_user_creds(&username, NULL, NULL, NULL, &shell);

if (r < 0)

return strdup("/bin/sh");

return strdup(shell);

}

char *unit_name_printf(Unit *u, const char* format) {

/*

const Specifier table[] = {

{ 'n', specifier_string, u->id },

{ 'N', specifier_prefix_and_instance, NULL },

{ 'p', specifier_prefix, NULL },

{ 'i', specifier_string, u->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

const Specifier table[] = {

{ 'n', specifier_string, u->id },

{ 'N', specifier_prefix_and_instance, NULL },

{ 'p', specifier_prefix, NULL },

{ 'P', specifier_prefix_unescaped, NULL },

{ 'i', specifier_string, u->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 },

{ 'u', specifier_user_name, NULL },

{ 'h', specifier_user_home, NULL },

{ 's', specifier_user_shell, 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

return hashmap_put(u->manager->watch_bus, name, u);

}

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

assert(u);

assert(name);

hashmap_remove_value(u->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, bool serialize_jobs) {

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 (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);

}

}

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);

if (dual_timestamp_is_set(&u->condition_timestamp))

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

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

/* new-style serialized job */

Job *j = job_new_raw(u);

if (!j)

return -ENOMEM;

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 */

JobType type = job_type_from_string(v);

if (type < 0)

log_debug("Failed to parse job type value %s", v);

else

u->deserialized_job = type;

}

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, "condition-result")) {

int b;

if ((b = parse_boolean(v)) < 0)

log_debug("Failed to parse condition result value %s", v);

else

u->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;

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

if (!e)

return -ENOMEM;

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

free(e);

if (r < 0)

return r;

if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BINDS_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->job) {

r = job_coldplug(u->job);

if (r < 0)

return r;

} else if (u->deserialized_job >= 0) {

/* legacy */

r = manager_add_job(u->manager, u->deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL);

if (r < 0)

return r;

u->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 (!manager_get_show_status(u->manager))

return;

if (!manager_is_booting_or_shutting_down(u->manager))

return;

va_start(ap, format);

status_vprintf(status, true, format, ap);

va_end(ap);

}

bool unit_need_daemon_reload(Unit *u) {

struct stat st;

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;

}

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->job && u->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->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, DBusError *error) {

assert(u);

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

assert(signo > 0);

assert(signo < _NSIG);

if (!UNIT_VTABLE(u)->kill)

return -ENOTSUP;

return UNIT_VTABLE(u)->kill(u, w, 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->unit_file_state < 0 && u->fragment_path)

u->unit_file_state = unit_file_get_state(

u->manager->running_as == MANAGER_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,

NULL, path_get_file_name(u->fragment_path));

return u->unit_file_state;

}

Unit* unit_ref_set(UnitRef *ref, Unit *u) {

assert(ref);

assert(u);

if (ref->unit)

unit_ref_unset(ref);

ref->unit = u;

LIST_PREPEND(UnitRef, refs, u->refs, ref);

return u;

}

void unit_ref_unset(UnitRef *ref) {

assert(ref);

if (!ref->unit)

return;

LIST_REMOVE(UnitRef, refs, ref->unit->refs, ref);

ref->unit = NULL;

}

int unit_add_one_mount_link(Unit *u, Mount *m) {

char **i;

assert(u);

assert(m);

if (u->load_state != UNIT_LOADED ||

UNIT(m)->load_state != UNIT_LOADED)

return 0;

STRV_FOREACH(i, u->requires_mounts_for) {

if (UNIT(m) == u)

continue;

if (!path_startswith(*i, m->where))

continue;

return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);

}

return 0;

}

int unit_add_mount_links(Unit *u) {

Unit *other;

int r;

assert(u);

LIST_FOREACH(units_by_type, other, u->manager->units_by_type[UNIT_MOUNT]) {

r = unit_add_one_mount_link(u, MOUNT(other));

if (r < 0)

return r;

}

return 0;

}

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

unsigned i;

int r;

assert(u);

assert(c);

/* This only copies in the ones that need memory */

for (i = 0; i < RLIMIT_NLIMITS; i++)

if (u->manager->rlimit[i] && !c->rlimit[i]) {

c->rlimit[i] = newdup(struct rlimit, u->manager->rlimit[i], 1);

if (!c->rlimit[i])

return -ENOMEM;

}

if (u->manager->running_as == MANAGER_USER &&

!c->working_directory) {

r = get_home_dir(&c->working_directory);

if (r < 0)

return r;

}

return 0;

}

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_BINDS_TO] = "BindsTo",

[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",

[UNIT_TRIGGERS] = "Triggers",

[UNIT_TRIGGERED_BY] = "TriggeredBy",

[UNIT_PROPAGATES_RELOAD_TO] = "PropagatesReloadTo",

[UNIT_RELOAD_PROPAGATED_FROM] = "ReloadPropagatedFrom"

};

DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);