1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
7 This file is part of systemd.
9 Copyright 2010 Lennart Poettering
11 systemd is free software; you can redistribute it and/or modify it
12 under the terms of the GNU Lesser General Public License as published by
13 the Free Software Foundation; either version 2.1 of the License, or
14 (at your option) any later version.
16 systemd is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Lesser General Public License for more details.
21 You should have received a copy of the GNU Lesser General Public License
22 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 typedef struct Job Job;
30 typedef struct JobDependency JobDependency;
31 typedef struct JobBusClient JobBusClient;
32 typedef enum JobType JobType;
33 typedef enum JobState JobState;
34 typedef enum JobMode JobMode;
35 typedef enum JobResult JobResult;
37 /* Be careful when changing the job types! Adjust job_merging_table[] accordingly! */
39 JOB_START, /* if a unit does not support being started, we'll just wait until it becomes active */
44 JOB_RELOAD, /* if running, reload */
46 /* Note that restarts are first treated like JOB_STOP, but
47 * then instead of finishing are patched to become
49 JOB_RESTART, /* If running, stop. Then start unconditionally. */
51 _JOB_TYPE_MAX_MERGING,
53 /* JOB_NOP can enter into a transaction, but as it won't pull in
54 * any dependencies, it won't have to merge with anything.
55 * job_install() avoids the problem of merging JOB_NOP too (it's
56 * special-cased, only merges with other JOB_NOPs). */
57 JOB_NOP = _JOB_TYPE_MAX_MERGING, /* do nothing */
59 _JOB_TYPE_MAX_IN_TRANSACTION,
61 /* JOB_TRY_RESTART can never appear in a transaction, because
62 * it always collapses into JOB_RESTART or JOB_NOP before entering.
63 * Thus we never need to merge it with anything. */
64 JOB_TRY_RESTART = _JOB_TYPE_MAX_IN_TRANSACTION, /* if running, stop and then start */
66 /* JOB_RELOAD_OR_START won't enter into a transaction and cannot result
67 * from transaction merging (there's no way for JOB_RELOAD and
68 * JOB_START to meet in one transaction). It can result from a merge
69 * during job installation, but then it will immediately collapse into
70 * one of the two simpler types. */
71 JOB_RELOAD_OR_START, /* if running, reload, otherwise start */
74 _JOB_TYPE_INVALID = -1
81 _JOB_STATE_INVALID = -1
85 JOB_FAIL, /* Fail if a conflicting job is already queued */
86 JOB_REPLACE, /* Replace an existing conflicting job */
87 JOB_ISOLATE, /* Start a unit, and stop all others */
88 JOB_IGNORE_DEPENDENCIES, /* Ignore both requirement and ordering dependencies */
89 JOB_IGNORE_REQUIREMENTS, /* Ignore requirement dependencies */
91 _JOB_MODE_INVALID = -1
102 _JOB_RESULT_INVALID = -1
110 struct JobDependency {
111 /* Encodes that the 'subject' job needs the 'object' job in
112 * some way. This structure is used only while building a transaction. */
116 LIST_FIELDS(JobDependency, subject);
117 LIST_FIELDS(JobDependency, object);
123 struct JobBusClient {
124 LIST_FIELDS(JobBusClient, client);
125 /* Note that this bus object is not ref counted here. */
134 LIST_FIELDS(Job, transaction);
135 LIST_FIELDS(Job, run_queue);
136 LIST_FIELDS(Job, dbus_queue);
138 LIST_HEAD(JobDependency, subject_list);
139 LIST_HEAD(JobDependency, object_list);
141 /* Used for graph algs as a "I have been here" marker */
152 /* There can be more than one client, because of job merging. */
153 LIST_HEAD(JobBusClient, bus_client_list);
159 bool matters_to_anchor:1;
161 bool in_dbus_queue:1;
162 bool sent_dbus_new_signal:1;
164 bool forgot_bus_clients:1;
167 JobBusClient* job_bus_client_new(DBusConnection *connection, const char *name);
169 Job* job_new(Unit *unit, JobType type);
170 Job* job_new_raw(Unit *unit);
171 void job_free(Job *job);
172 Job* job_install(Job *j);
173 int job_install_deserialized(Job *j);
174 void job_uninstall(Job *j);
175 void job_dump(Job *j, FILE*f, const char *prefix);
176 int job_serialize(Job *j, FILE *f, FDSet *fds);
177 int job_deserialize(Job *j, FILE *f, FDSet *fds);
178 int job_coldplug(Job *j);
180 JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts);
181 void job_dependency_free(JobDependency *l);
183 int job_merge(Job *j, Job *other);
185 JobType job_type_lookup_merge(JobType a, JobType b);
187 static inline bool job_type_is_mergeable(JobType a, JobType b) {
188 return job_type_lookup_merge(a, b) >= 0;
191 static inline bool job_type_is_conflicting(JobType a, JobType b) {
192 return !job_type_is_mergeable(a, b);
195 static inline bool job_type_is_superset(JobType a, JobType b) {
196 /* Checks whether operation a is a "superset" of b in its actions */
197 return a == job_type_lookup_merge(a, b);
200 bool job_type_is_redundant(JobType a, UnitActiveState b);
202 /* Collapses a state-dependent job type into a simpler type by observing
203 * the state of the unit which it is going to be applied to. */
204 void job_type_collapse(JobType *t, Unit *u);
206 int job_type_merge_and_collapse(JobType *a, JobType b, Unit *u);
208 bool job_is_runnable(Job *j);
210 void job_add_to_run_queue(Job *j);
211 void job_add_to_dbus_queue(Job *j);
213 int job_start_timer(Job *j);
214 void job_timer_event(Job *j, uint64_t n_elapsed, Watch *w);
216 int job_run_and_invalidate(Job *j);
217 int job_finish_and_invalidate(Job *j, JobResult result, bool recursive);
219 char *job_dbus_path(Job *j);
221 const char* job_type_to_string(JobType t);
222 JobType job_type_from_string(const char *s);
224 const char* job_state_to_string(JobState t);
225 JobState job_state_from_string(const char *s);
227 const char* job_mode_to_string(JobMode t);
228 JobMode job_mode_from_string(const char *s);
230 const char* job_result_to_string(JobResult t);
231 JobResult job_result_from_string(const char *s);