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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdbool.h>
#include "sd-event.h"
#include "list.h"
#include "unit-name.h"
typedef struct Job Job;
typedef struct JobDependency JobDependency;
typedef enum JobType JobType;
typedef enum JobState JobState;
typedef enum JobMode JobMode;
typedef enum JobResult JobResult;
/* Be careful when changing the job types! Adjust job_merging_table[] accordingly! */
enum JobType {
JOB_START, /* if a unit does not support being started, we'll just wait until it becomes active */
JOB_VERIFY_ACTIVE,
JOB_STOP,
JOB_RELOAD, /* if running, reload */
/* Note that restarts are first treated like JOB_STOP, but
* then instead of finishing are patched to become
* JOB_START. */
JOB_RESTART, /* If running, stop. Then start unconditionally. */
_JOB_TYPE_MAX_MERGING,
/* JOB_NOP can enter into a transaction, but as it won't pull in
* any dependencies and it uses the special 'nop_job' slot in Unit,
* it won't have to merge with anything (except possibly into another
* JOB_NOP, previously installed). JOB_NOP is special-cased in
* job_type_is_*() functions so that the transaction can be
* activated. */
JOB_NOP = _JOB_TYPE_MAX_MERGING, /* do nothing */
_JOB_TYPE_MAX_IN_TRANSACTION,
/* JOB_TRY_RESTART can never appear in a transaction, because
* it always collapses into JOB_RESTART or JOB_NOP before entering.
* Thus we never need to merge it with anything. */
JOB_TRY_RESTART = _JOB_TYPE_MAX_IN_TRANSACTION, /* if running, stop and then start */
/* Similar to JOB_TRY_RESTART but collapses to JOB_RELOAD or JOB_NOP */
JOB_TRY_RELOAD,
/* JOB_RELOAD_OR_START won't enter into a transaction and cannot result
* from transaction merging (there's no way for JOB_RELOAD and
* JOB_START to meet in one transaction). It can result from a merge
* during job installation, but then it will immediately collapse into
* one of the two simpler types. */
JOB_RELOAD_OR_START, /* if running, reload, otherwise start */
_JOB_TYPE_MAX,
_JOB_TYPE_INVALID = -1
};
enum JobState {
JOB_WAITING,
JOB_RUNNING,
_JOB_STATE_MAX,
_JOB_STATE_INVALID = -1
};
enum JobMode {
JOB_FAIL, /* Fail if a conflicting job is already queued */
JOB_REPLACE, /* Replace an existing conflicting job */
JOB_REPLACE_IRREVERSIBLY,/* Like JOB_REPLACE + produce irreversible jobs */
JOB_ISOLATE, /* Start a unit, and stop all others */
JOB_FLUSH, /* Flush out all other queued jobs when queing this one */
JOB_IGNORE_DEPENDENCIES, /* Ignore both requirement and ordering dependencies */
JOB_IGNORE_REQUIREMENTS, /* Ignore requirement dependencies */
_JOB_MODE_MAX,
_JOB_MODE_INVALID = -1
};
enum JobResult {
JOB_DONE, /* Job completed successfully */
JOB_CANCELED, /* Job canceled by a conflicting job installation or by explicit cancel request */
JOB_TIMEOUT, /* Job timeout elapsed */
JOB_FAILED, /* Job failed */
JOB_DEPENDENCY, /* A required dependency job did not result in JOB_DONE */
JOB_SKIPPED, /* Negative result of JOB_VERIFY_ACTIVE */
JOB_INVALID, /* JOB_RELOAD of inactive unit */
JOB_ASSERT, /* Couldn't start a unit, because an assert didn't hold */
JOB_UNSUPPORTED, /* Couldn't start a unit, because the unit type is not supported on the system */
_JOB_RESULT_MAX,
_JOB_RESULT_INVALID = -1
};
#include "unit.h"
struct JobDependency {
/* Encodes that the 'subject' job needs the 'object' job in
* some way. This structure is used only while building a transaction. */
Job *subject;
Job *object;
LIST_FIELDS(JobDependency, subject);
LIST_FIELDS(JobDependency, object);
bool matters;
bool conflicts;
};
struct Job {
Manager *manager;
Unit *unit;
LIST_FIELDS(Job, transaction);
LIST_FIELDS(Job, run_queue);
LIST_FIELDS(Job, dbus_queue);
LIST_HEAD(JobDependency, subject_list);
LIST_HEAD(JobDependency, object_list);
/* Used for graph algs as a "I have been here" marker */
Job* marker;
unsigned generation;
uint32_t id;
JobType type;
JobState state;
sd_event_source *timer_event_source;
usec_t begin_usec;
/*
* This tracks where to send signals, and also which clients
* are allowed to call DBus methods on the job (other than
* root).
*
* There can be more than one client, because of job merging.
*/
sd_bus_track *clients;
char **deserialized_clients;
JobResult result;
bool installed:1;
bool in_run_queue:1;
bool matters_to_anchor:1;
bool in_dbus_queue:1;
bool sent_dbus_new_signal:1;
bool ignore_order:1;
bool irreversible:1;
};
Job* job_new(Unit *unit, JobType type);
Job* job_new_raw(Unit *unit);
void job_free(Job *job);
Job* job_install(Job *j);
int job_install_deserialized(Job *j);
void job_uninstall(Job *j);
void job_dump(Job *j, FILE*f, const char *prefix);
int job_serialize(Job *j, FILE *f, FDSet *fds);
int job_deserialize(Job *j, FILE *f, FDSet *fds);
int job_coldplug(Job *j);
JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts);
void job_dependency_free(JobDependency *l);
int job_merge(Job *j, Job *other);
JobType job_type_lookup_merge(JobType a, JobType b) _pure_;
_pure_ static inline bool job_type_is_mergeable(JobType a, JobType b) {
return job_type_lookup_merge(a, b) >= 0;
}
_pure_ static inline bool job_type_is_conflicting(JobType a, JobType b) {
return a != JOB_NOP && b != JOB_NOP && !job_type_is_mergeable(a, b);
}
_pure_ static inline bool job_type_is_superset(JobType a, JobType b) {
/* Checks whether operation a is a "superset" of b in its actions */
if (b == JOB_NOP)
return true;
if (a == JOB_NOP)
return false;
return a == job_type_lookup_merge(a, b);
}
bool job_type_is_redundant(JobType a, UnitActiveState b) _pure_;
/* Collapses a state-dependent job type into a simpler type by observing
* the state of the unit which it is going to be applied to. */
JobType job_type_collapse(JobType t, Unit *u);
int job_type_merge_and_collapse(JobType *a, JobType b, Unit *u);
void job_add_to_run_queue(Job *j);
void job_add_to_dbus_queue(Job *j);
int job_start_timer(Job *j);
int job_run_and_invalidate(Job *j);
int job_finish_and_invalidate(Job *j, JobResult result, bool recursive);
char *job_dbus_path(Job *j);
void job_shutdown_magic(Job *j);
int job_get_timeout(Job *j, usec_t *timeout) _pure_;
const char* job_type_to_string(JobType t) _const_;
JobType job_type_from_string(const char *s) _pure_;
const char* job_state_to_string(JobState t) _const_;
JobState job_state_from_string(const char *s) _pure_;
const char* job_mode_to_string(JobMode t) _const_;
JobMode job_mode_from_string(const char *s) _pure_;
const char* job_result_to_string(JobResult t) _const_;
JobResult job_result_from_string(const char *s) _pure_;
const char* job_type_to_access_method(JobType t);
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