Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : #pragma once
3 :
4 : #include <stdbool.h>
5 :
6 : #include "sd-event.h"
7 :
8 : #include "list.h"
9 : #include "unit-name.h"
10 :
11 : typedef struct Job Job;
12 : typedef struct JobDependency JobDependency;
13 : typedef enum JobType JobType;
14 : typedef enum JobState JobState;
15 : typedef enum JobMode JobMode;
16 : typedef enum JobResult JobResult;
17 :
18 : /* Be careful when changing the job types! Adjust job_merging_table[] accordingly! */
19 : enum JobType {
20 : JOB_START, /* if a unit does not support being started, we'll just wait until it becomes active */
21 : JOB_VERIFY_ACTIVE,
22 :
23 : JOB_STOP,
24 :
25 : JOB_RELOAD, /* if running, reload */
26 :
27 : /* Note that restarts are first treated like JOB_STOP, but
28 : * then instead of finishing are patched to become
29 : * JOB_START. */
30 : JOB_RESTART, /* If running, stop. Then start unconditionally. */
31 :
32 : _JOB_TYPE_MAX_MERGING,
33 :
34 : /* JOB_NOP can enter into a transaction, but as it won't pull in
35 : * any dependencies and it uses the special 'nop_job' slot in Unit,
36 : * it won't have to merge with anything (except possibly into another
37 : * JOB_NOP, previously installed). JOB_NOP is special-cased in
38 : * job_type_is_*() functions so that the transaction can be
39 : * activated. */
40 : JOB_NOP = _JOB_TYPE_MAX_MERGING, /* do nothing */
41 :
42 : _JOB_TYPE_MAX_IN_TRANSACTION,
43 :
44 : /* JOB_TRY_RESTART can never appear in a transaction, because
45 : * it always collapses into JOB_RESTART or JOB_NOP before entering.
46 : * Thus we never need to merge it with anything. */
47 : JOB_TRY_RESTART = _JOB_TYPE_MAX_IN_TRANSACTION, /* if running, stop and then start */
48 :
49 : /* Similar to JOB_TRY_RESTART but collapses to JOB_RELOAD or JOB_NOP */
50 : JOB_TRY_RELOAD,
51 :
52 : /* JOB_RELOAD_OR_START won't enter into a transaction and cannot result
53 : * from transaction merging (there's no way for JOB_RELOAD and
54 : * JOB_START to meet in one transaction). It can result from a merge
55 : * during job installation, but then it will immediately collapse into
56 : * one of the two simpler types. */
57 : JOB_RELOAD_OR_START, /* if running, reload, otherwise start */
58 :
59 : _JOB_TYPE_MAX,
60 : _JOB_TYPE_INVALID = -1
61 : };
62 :
63 : enum JobState {
64 : JOB_WAITING,
65 : JOB_RUNNING,
66 : _JOB_STATE_MAX,
67 : _JOB_STATE_INVALID = -1
68 : };
69 :
70 : enum JobMode {
71 : JOB_FAIL, /* Fail if a conflicting job is already queued */
72 : JOB_REPLACE, /* Replace an existing conflicting job */
73 : JOB_REPLACE_IRREVERSIBLY,/* Like JOB_REPLACE + produce irreversible jobs */
74 : JOB_ISOLATE, /* Start a unit, and stop all others */
75 : JOB_FLUSH, /* Flush out all other queued jobs when queueing this one */
76 : JOB_IGNORE_DEPENDENCIES, /* Ignore both requirement and ordering dependencies */
77 : JOB_IGNORE_REQUIREMENTS, /* Ignore requirement dependencies */
78 : _JOB_MODE_MAX,
79 : _JOB_MODE_INVALID = -1
80 : };
81 :
82 : enum JobResult {
83 : JOB_DONE, /* Job completed successfully (or skipped due to a failed ConditionXYZ=) */
84 : JOB_CANCELED, /* Job canceled by a conflicting job installation or by explicit cancel request */
85 : JOB_TIMEOUT, /* Job timeout elapsed */
86 : JOB_FAILED, /* Job failed */
87 : JOB_DEPENDENCY, /* A required dependency job did not result in JOB_DONE */
88 : JOB_SKIPPED, /* Negative result of JOB_VERIFY_ACTIVE or skip due to ExecCondition= */
89 : JOB_INVALID, /* JOB_RELOAD of inactive unit */
90 : JOB_ASSERT, /* Couldn't start a unit, because an assert didn't hold */
91 : JOB_UNSUPPORTED, /* Couldn't start a unit, because the unit type is not supported on the system */
92 : JOB_COLLECTED, /* Job was garbage collected, since nothing needed it anymore */
93 : JOB_ONCE, /* Unit was started before, and hence can't be started again */
94 : _JOB_RESULT_MAX,
95 : _JOB_RESULT_INVALID = -1
96 : };
97 :
98 : #include "unit.h"
99 :
100 : struct JobDependency {
101 : /* Encodes that the 'subject' job needs the 'object' job in
102 : * some way. This structure is used only while building a transaction. */
103 : Job *subject;
104 : Job *object;
105 :
106 : LIST_FIELDS(JobDependency, subject);
107 : LIST_FIELDS(JobDependency, object);
108 :
109 : bool matters:1;
110 : bool conflicts:1;
111 : };
112 :
113 : struct Job {
114 : Manager *manager;
115 : Unit *unit;
116 :
117 : LIST_FIELDS(Job, transaction);
118 : LIST_FIELDS(Job, dbus_queue);
119 : LIST_FIELDS(Job, gc_queue);
120 :
121 : LIST_HEAD(JobDependency, subject_list);
122 : LIST_HEAD(JobDependency, object_list);
123 :
124 : /* Used for graph algs as a "I have been here" marker */
125 : Job* marker;
126 : unsigned generation;
127 :
128 : uint32_t id;
129 :
130 : JobType type;
131 : JobState state;
132 :
133 : sd_event_source *timer_event_source;
134 : usec_t begin_usec;
135 : usec_t begin_running_usec;
136 :
137 : /*
138 : * This tracks where to send signals, and also which clients
139 : * are allowed to call DBus methods on the job (other than
140 : * root).
141 : *
142 : * There can be more than one client, because of job merging.
143 : */
144 : sd_bus_track *bus_track;
145 : char **deserialized_clients;
146 :
147 : JobResult result;
148 :
149 : unsigned run_queue_idx;
150 :
151 : bool installed:1;
152 : bool in_run_queue:1;
153 : bool matters_to_anchor:1;
154 : bool in_dbus_queue:1;
155 : bool sent_dbus_new_signal:1;
156 : bool ignore_order:1;
157 : bool irreversible:1;
158 : bool in_gc_queue:1;
159 : bool ref_by_private_bus:1;
160 : };
161 :
162 : Job* job_new(Unit *unit, JobType type);
163 : Job* job_new_raw(Unit *unit);
164 : void job_unlink(Job *job);
165 : Job* job_free(Job *job);
166 : Job* job_install(Job *j);
167 : int job_install_deserialized(Job *j);
168 : void job_uninstall(Job *j);
169 : void job_dump(Job *j, FILE *f, const char *prefix);
170 : int job_serialize(Job *j, FILE *f);
171 : int job_deserialize(Job *j, FILE *f);
172 : int job_coldplug(Job *j);
173 :
174 : JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts);
175 : void job_dependency_free(JobDependency *l);
176 :
177 : int job_merge(Job *j, Job *other);
178 :
179 : JobType job_type_lookup_merge(JobType a, JobType b) _pure_;
180 :
181 1392 : _pure_ static inline bool job_type_is_mergeable(JobType a, JobType b) {
182 1392 : return job_type_lookup_merge(a, b) >= 0;
183 : }
184 :
185 62 : _pure_ static inline bool job_type_is_conflicting(JobType a, JobType b) {
186 62 : return a != JOB_NOP && b != JOB_NOP && !job_type_is_mergeable(a, b);
187 : }
188 :
189 0 : _pure_ static inline bool job_type_is_superset(JobType a, JobType b) {
190 : /* Checks whether operation a is a "superset" of b in its actions */
191 0 : if (b == JOB_NOP)
192 0 : return true;
193 0 : if (a == JOB_NOP)
194 0 : return false;
195 0 : return a == job_type_lookup_merge(a, b);
196 : }
197 :
198 : bool job_type_is_redundant(JobType a, UnitActiveState b) _pure_;
199 :
200 : /* Collapses a state-dependent job type into a simpler type by observing
201 : * the state of the unit which it is going to be applied to. */
202 : JobType job_type_collapse(JobType t, Unit *u);
203 :
204 : int job_type_merge_and_collapse(JobType *a, JobType b, Unit *u);
205 :
206 : void job_add_to_run_queue(Job *j);
207 : void job_add_to_dbus_queue(Job *j);
208 :
209 : int job_start_timer(Job *j, bool job_running);
210 :
211 : int job_run_and_invalidate(Job *j);
212 : int job_finish_and_invalidate(Job *j, JobResult result, bool recursive, bool already);
213 :
214 : char *job_dbus_path(Job *j);
215 :
216 : void job_shutdown_magic(Job *j);
217 :
218 : int job_get_timeout(Job *j, usec_t *timeout) _pure_;
219 :
220 : bool job_may_gc(Job *j);
221 : void job_add_to_gc_queue(Job *j);
222 :
223 : int job_get_before(Job *j, Job*** ret);
224 : int job_get_after(Job *j, Job*** ret);
225 :
226 0 : DEFINE_TRIVIAL_CLEANUP_FUNC(Job*, job_free);
227 :
228 : const char* job_type_to_string(JobType t) _const_;
229 : JobType job_type_from_string(const char *s) _pure_;
230 :
231 : const char* job_state_to_string(JobState t) _const_;
232 : JobState job_state_from_string(const char *s) _pure_;
233 :
234 : const char* job_mode_to_string(JobMode t) _const_;
235 : JobMode job_mode_from_string(const char *s) _pure_;
236 :
237 : const char* job_result_to_string(JobResult t) _const_;
238 : JobResult job_result_from_string(const char *s) _pure_;
239 :
240 : const char* job_type_to_access_method(JobType t);
241 :
242 : int job_compare(Job *a, Job *b, UnitDependency assume_dep);
|
