1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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 General Public License as published by
13 the Free Software Foundation; either version 2 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 General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 typedef union Unit Unit
;
29 typedef struct Meta Meta
;
30 typedef struct UnitVTable UnitVTable
;
31 typedef enum UnitType UnitType
;
32 typedef enum UnitLoadState UnitLoadState
;
33 typedef enum UnitActiveState UnitActiveState
;
34 typedef enum UnitDependency UnitDependency
;
39 #include "socket-util.h"
42 #define UNIT_NAME_MAX 128
43 #define DEFAULT_TIMEOUT_USEC (20*USEC_PER_SEC)
44 #define DEFAULT_RESTART_USEC (100*USEC_PER_MSEC)
46 typedef enum KillMode
{
47 KILL_CONTROL_GROUP
= 0,
52 _KILL_MODE_INVALID
= -1
66 _UNIT_TYPE_INVALID
= -1
75 _UNIT_LOAD_STATE_INVALID
= -1
78 enum UnitActiveState
{
80 UNIT_ACTIVE_RELOADING
,
84 _UNIT_ACTIVE_STATE_MAX
,
85 _UNIT_ACTIVE_STATE_INVALID
= -1
88 static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t
) {
89 return t
== UNIT_ACTIVE
|| t
== UNIT_ACTIVE_RELOADING
;
92 static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t
) {
93 return t
== UNIT_ACTIVE
|| t
== UNIT_ACTIVATING
|| t
== UNIT_ACTIVE_RELOADING
;
96 static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t
) {
97 return t
== UNIT_INACTIVE
|| t
== UNIT_DEACTIVATING
;
100 enum UnitDependency
{
101 /* Positive dependencies */
103 UNIT_REQUIRES_OVERRIDABLE
,
105 UNIT_REQUISITE_OVERRIDABLE
,
108 /* Inverse of the above */
109 UNIT_REQUIRED_BY
, /* inverse of 'requires' and 'requisite' is 'required_by' */
110 UNIT_REQUIRED_BY_OVERRIDABLE
, /* inverse of 'soft_requires' and 'soft_requisite' is 'soft_required_by' */
111 UNIT_WANTED_BY
, /* inverse of 'wants' */
113 /* Negative dependencies */
114 UNIT_CONFLICTS
, /* inverse of 'conflicts' is 'conflicts' */
117 UNIT_BEFORE
, /* inverse of 'before' is 'after' and vice versa */
120 /* Reference information for GC logic */
121 UNIT_REFERENCES
, /* Inverse of 'references' is 'referenced_by' */
124 _UNIT_DEPENDENCY_MAX
,
125 _UNIT_DEPENDENCY_INVALID
= -1
136 UnitLoadState load_state
;
139 char *id
; /* One name is special because we use it for identification. Points to an entry in the names set */
143 Set
*dependencies
[_UNIT_DEPENDENCY_MAX
];
146 char *fragment_path
; /* if loaded from a config file this is the primary path to it */
148 /* If there is something to do with this unit, then this is
152 usec_t active_enter_timestamp
;
153 usec_t active_exit_timestamp
;
155 /* Counterparts in the cgroup filesystem */
156 CGroupBonding
*cgroup_bondings
;
159 LIST_FIELDS(Meta
, units_per_type
);
162 LIST_FIELDS(Meta
, load_queue
);
165 LIST_FIELDS(Meta
, dbus_queue
);
168 LIST_FIELDS(Meta
, cleanup_queue
);
171 LIST_FIELDS(Meta
, gc_queue
);
173 /* Used during GC sweeps */
176 /* If we go down, pull down everything that depends on us, too */
179 /* Garbage collect us we nobody wants or requires us anymore */
180 bool stop_when_unneeded
;
182 bool in_load_queue
:1;
183 bool in_dbus_queue
:1;
184 bool in_cleanup_queue
:1;
187 bool sent_dbus_new_signal
:1;
196 #include "automount.h"
197 #include "snapshot.h"
216 /* This should reset all type-specific variables. This should
217 * not allocate memory, and is called with zero-initialized
218 * data. It should hence only initialize variables that need
220 void (*init
)(Unit
*u
);
222 /* This should free all type-specific variables. It should be
224 void (*done
)(Unit
*u
);
226 /* Actually load data from disk. This may fail, and should set
227 * load_state to UNIT_LOADED, UNIT_MERGED or leave it at
228 * UNIT_STUB if no configuration could be found. */
229 int (*load
)(Unit
*u
);
231 /* If a a lot of units got created via enumerate(), this is
232 * where to actually set the state and call unit_notify(). */
233 int (*coldplug
)(Unit
*u
);
235 void (*dump
)(Unit
*u
, FILE *f
, const char *prefix
);
237 int (*start
)(Unit
*u
);
238 int (*stop
)(Unit
*u
);
239 int (*reload
)(Unit
*u
);
241 bool (*can_reload
)(Unit
*u
);
243 /* Write all data that cannot be restored from other sources
244 * away using unit_serialize_item() */
245 int (*serialize
)(Unit
*u
, FILE *f
, FDSet
*fds
);
247 /* Restore one item from the serialization */
248 int (*deserialize_item
)(Unit
*u
, const char *key
, const char *data
, FDSet
*fds
);
250 /* Boils down the more complex internal state of this unit to
251 * a simpler one that the engine can understand */
252 UnitActiveState (*active_state
)(Unit
*u
);
254 /* Returns the substate specific to this unit type as
255 * string. This is purely information so that we can give the
256 * user a more finegrained explanation in which actual state a
258 const char* (*sub_state_to_string
)(Unit
*u
);
260 /* Return true when there is reason to keep this entry around
261 * even nothing references it and it isn't active in any
263 bool (*check_gc
)(Unit
*u
);
265 /* Return true when this unit is suitable for snapshotting */
266 bool (*check_snapshot
)(Unit
*u
);
268 void (*fd_event
)(Unit
*u
, int fd
, uint32_t events
, Watch
*w
);
269 void (*sigchld_event
)(Unit
*u
, pid_t pid
, int code
, int status
);
270 void (*timer_event
)(Unit
*u
, uint64_t n_elapsed
, Watch
*w
);
272 /* Called whenever any of the cgroups this unit watches for
274 void (*cgroup_notify_empty
)(Unit
*u
);
276 /* Called whenever a name thus Unit registered for comes or
278 void (*bus_name_owner_change
)(Unit
*u
, const char *name
, const char *old_owner
, const char *new_owner
);
280 /* Called whenever a bus PID lookup finishes */
281 void (*bus_query_pid_done
)(Unit
*u
, const char *name
, pid_t pid
);
283 /* Called for each message received on the bus */
284 DBusHandlerResult (*bus_message_handler
)(Unit
*u
, DBusMessage
*message
);
286 /* This is called for each unit type and should be used to
287 * enumerate existing devices and load them. However,
288 * everything that is loaded here should still stay in
289 * inactive state. It is the job of the coldplug() call above
290 * to put the units into the initial state. */
291 int (*enumerate
)(Manager
*m
);
293 /* Type specific cleanups. */
294 void (*shutdown
)(Manager
*m
);
296 /* Can units of this type have multiple names? */
299 /* If true units of this types can never have "Requires"
300 * dependencies, because state changes can only be observed,
304 /* Instances make no sense for this type */
307 /* Exclude this type from snapshots */
310 /* Exclude from automatic gc */
313 /* Exclude from isolation requests */
317 extern const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
];
319 #define UNIT_VTABLE(u) unit_vtable[(u)->meta.type]
321 /* For casting a unit into the various unit types */
322 #define DEFINE_CAST(UPPERCASE, MixedCase) \
323 static inline MixedCase* UPPERCASE(Unit *u) { \
324 if (!u || u->meta.type != UNIT_##UPPERCASE) \
327 return (MixedCase*) u; \
330 /* For casting the various unit types into a unit */
331 #define UNIT(u) ((Unit*) (u))
333 DEFINE_CAST(SOCKET
, Socket
);
334 DEFINE_CAST(TIMER
, Timer
);
335 DEFINE_CAST(SERVICE
, Service
);
336 DEFINE_CAST(TARGET
, Target
);
337 DEFINE_CAST(DEVICE
, Device
);
338 DEFINE_CAST(MOUNT
, Mount
);
339 DEFINE_CAST(AUTOMOUNT
, Automount
);
340 DEFINE_CAST(SNAPSHOT
, Snapshot
);
341 DEFINE_CAST(SWAP
, Swap
);
343 Unit
*unit_new(Manager
*m
);
344 void unit_free(Unit
*u
);
346 int unit_add_name(Unit
*u
, const char *name
);
348 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
, bool add_reference
);
349 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *filename
, bool add_reference
);
350 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
, const char *filename
, bool add_reference
);
352 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
);
354 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
);
355 int unit_add_cgroup_from_text(Unit
*u
, const char *name
);
356 int unit_add_default_cgroup(Unit
*u
);
357 CGroupBonding
* unit_get_default_cgroup(Unit
*u
);
359 int unit_choose_id(Unit
*u
, const char *name
);
360 int unit_set_description(Unit
*u
, const char *description
);
362 bool unit_check_gc(Unit
*u
);
364 void unit_add_to_load_queue(Unit
*u
);
365 void unit_add_to_dbus_queue(Unit
*u
);
366 void unit_add_to_cleanup_queue(Unit
*u
);
367 void unit_add_to_gc_queue(Unit
*u
);
369 int unit_merge(Unit
*u
, Unit
*other
);
370 int unit_merge_by_name(Unit
*u
, const char *other
);
372 Unit
*unit_follow_merge(Unit
*u
);
374 int unit_load_fragment_and_dropin(Unit
*u
);
375 int unit_load_fragment_and_dropin_optional(Unit
*u
);
376 int unit_load_nop(Unit
*u
);
377 int unit_load(Unit
*unit
);
379 const char *unit_description(Unit
*u
);
381 bool unit_has_name(Unit
*u
, const char *name
);
383 UnitActiveState
unit_active_state(Unit
*u
);
385 const char* unit_sub_state_to_string(Unit
*u
);
387 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
);
389 bool unit_can_reload(Unit
*u
);
390 bool unit_can_start(Unit
*u
);
392 int unit_start(Unit
*u
);
393 int unit_stop(Unit
*u
);
394 int unit_reload(Unit
*u
);
396 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
);
398 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
);
399 void unit_unwatch_fd(Unit
*u
, Watch
*w
);
401 int unit_watch_pid(Unit
*u
, pid_t pid
);
402 void unit_unwatch_pid(Unit
*u
, pid_t pid
);
404 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
);
405 void unit_unwatch_timer(Unit
*u
, Watch
*w
);
407 int unit_watch_bus_name(Unit
*u
, const char *name
);
408 void unit_unwatch_bus_name(Unit
*u
, const char *name
);
410 bool unit_job_is_applicable(Unit
*u
, JobType j
);
412 int set_unit_path(const char *p
);
414 char *unit_dbus_path(Unit
*u
);
416 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
);
417 int unit_get_related_unit(Unit
*u
, const char *type
, Unit
**_found
);
419 char *unit_name_printf(Unit
*u
, const char* text
);
420 char *unit_full_printf(Unit
*u
, const char *text
);
421 char **unit_full_printf_strv(Unit
*u
, char **l
);
423 bool unit_can_serialize(Unit
*u
);
424 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
);
425 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *value
, ...) _printf_attr(4,5);
426 void unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
);
427 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
);
429 const char *unit_type_to_string(UnitType i
);
430 UnitType
unit_type_from_string(const char *s
);
432 const char *unit_load_state_to_string(UnitLoadState i
);
433 UnitLoadState
unit_load_state_from_string(const char *s
);
435 const char *unit_active_state_to_string(UnitActiveState i
);
436 UnitActiveState
unit_active_state_from_string(const char *s
);
438 const char *unit_dependency_to_string(UnitDependency i
);
439 UnitDependency
unit_dependency_from_string(const char *s
);
441 const char *kill_mode_to_string(KillMode k
);
442 KillMode
kill_mode_from_string(const char *s
);