src/core/unit.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <stdbool.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27
  28 typedef struct Unit Unit;
  29 typedef struct UnitVTable UnitVTable;
  30 typedef enum UnitActiveState UnitActiveState;
  31 typedef struct UnitRef UnitRef;
  32 typedef struct UnitStatusMessageFormats UnitStatusMessageFormats;
  33
  34 #include "list.h"
  35 #include "condition.h"
  36 #include "install.h"
  37 #include "unit-name.h"
  38 #include "failure-action.h"
  39
  40 enum UnitActiveState {
  41         UNIT_ACTIVE,
  42         UNIT_RELOADING,
  43         UNIT_INACTIVE,
  44         UNIT_FAILED,
  45         UNIT_ACTIVATING,
  46         UNIT_DEACTIVATING,
  47         _UNIT_ACTIVE_STATE_MAX,
  48         _UNIT_ACTIVE_STATE_INVALID = -1
  49 };
  50
  51 typedef enum KillOperation {
  52         KILL_TERMINATE,
  53         KILL_KILL,
  54         KILL_ABORT,
  55         _KILL_OPERATION_MAX,
  56         _KILL_OPERATION_INVALID = -1
  57 } KillOperation;
  58
  59 static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) {
  60         return t == UNIT_ACTIVE || t == UNIT_RELOADING;
  61 }
  62
  63 static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t) {
  64         return t == UNIT_ACTIVE || t == UNIT_ACTIVATING || t == UNIT_RELOADING;
  65 }
  66
  67 static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t) {
  68         return t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING;
  69 }
  70
  71 static inline bool UNIT_IS_INACTIVE_OR_FAILED(UnitActiveState t) {
  72         return t == UNIT_INACTIVE || t == UNIT_FAILED;
  73 }
  74
  75 #include "job.h"
  76
  77 struct UnitRef {
  78         /* Keeps tracks of references to a unit. This is useful so
  79          * that we can merge two units if necessary and correct all
  80          * references to them */
  81
  82         Unit* unit;
  83         LIST_FIELDS(UnitRef, refs);
  84 };
  85
  86 struct Unit {
  87         Manager *manager;
  88
  89         UnitType type;
  90         UnitLoadState load_state;
  91         Unit *merged_into;
  92
  93         char *id; /* One name is special because we use it for identification. Points to an entry in the names set */
  94         char *instance;
  95
  96         Set *names;
  97         Set *dependencies[_UNIT_DEPENDENCY_MAX];
  98
  99         char **requires_mounts_for;
 100
 101         char *description;
 102         char **documentation;
 103
 104         char *fragment_path; /* if loaded from a config file this is the primary path to it */
 105         char *source_path; /* if converted, the source file */
 106         char **dropin_paths;
 107
 108         usec_t fragment_mtime;
 109         usec_t source_mtime;
 110         usec_t dropin_mtime;
 111
 112         /* If there is something to do with this unit, then this is the installed job for it */
 113         Job *job;
 114
 115         /* JOB_NOP jobs are special and can be installed without disturbing the real job. */
 116         Job *nop_job;
 117
 118         /* The slot used for watching NameOwnerChanged signals */
 119         sd_bus_slot *match_bus_slot;
 120
 121         /* Job timeout and action to take */
 122         usec_t job_timeout;
 123         FailureAction job_timeout_action;
 124         char *job_timeout_reboot_arg;
 125
 126         /* References to this */
 127         LIST_HEAD(UnitRef, refs);
 128
 129         /* Conditions to check */
 130         LIST_HEAD(Condition, conditions);
 131         LIST_HEAD(Condition, asserts);
 132
 133         dual_timestamp condition_timestamp;
 134         dual_timestamp assert_timestamp;
 135
 136         dual_timestamp inactive_exit_timestamp;
 137         dual_timestamp active_enter_timestamp;
 138         dual_timestamp active_exit_timestamp;
 139         dual_timestamp inactive_enter_timestamp;
 140
 141         UnitRef slice;
 142
 143         /* Per type list */
 144         LIST_FIELDS(Unit, units_by_type);
 145
 146         /* All units which have requires_mounts_for set */
 147         LIST_FIELDS(Unit, has_requires_mounts_for);
 148
 149         /* Load queue */
 150         LIST_FIELDS(Unit, load_queue);
 151
 152         /* D-Bus queue */
 153         LIST_FIELDS(Unit, dbus_queue);
 154
 155         /* Cleanup queue */
 156         LIST_FIELDS(Unit, cleanup_queue);
 157
 158         /* GC queue */
 159         LIST_FIELDS(Unit, gc_queue);
 160
 161         /* CGroup realize members queue */
 162         LIST_FIELDS(Unit, cgroup_queue);
 163
 164         /* PIDs we keep an eye on. Note that a unit might have many
 165          * more, but these are the ones we care enough about to
 166          * process SIGCHLD for */
 167         Set *pids;
 168
 169         /* Used during GC sweeps */
 170         unsigned gc_marker;
 171
 172         /* Error code when we didn't manage to load the unit (negative) */
 173         int load_error;
 174
 175         /* Make sure we never enter endless loops with the check unneeded logic, or the BindsTo= logic */
 176         RateLimit auto_stop_ratelimit;
 177
 178         /* Cached unit file state and preset */
 179         UnitFileState unit_file_state;
 180         int unit_file_preset;
 181
 182         /* Where the cpuacct.usage cgroup counter was at the time the unit was started */
 183         nsec_t cpuacct_usage_base;
 184
 185         /* Counterparts in the cgroup filesystem */
 186         char *cgroup_path;
 187         CGroupControllerMask cgroup_realized_mask;
 188         CGroupControllerMask cgroup_subtree_mask;
 189         CGroupControllerMask cgroup_members_mask;
 190
 191         /* How to start OnFailure units */
 192         JobMode on_failure_job_mode;
 193
 194         /* Garbage collect us we nobody wants or requires us anymore */
 195         bool stop_when_unneeded;
 196
 197         /* Create default dependencies */
 198         bool default_dependencies;
 199
 200         /* Refuse manual starting, allow starting only indirectly via dependency. */
 201         bool refuse_manual_start;
 202
 203         /* Don't allow the user to stop this unit manually, allow stopping only indirectly via dependency. */
 204         bool refuse_manual_stop;
 205
 206         /* Allow isolation requests */
 207         bool allow_isolate;
 208
 209         /* Ignore this unit when isolating */
 210         bool ignore_on_isolate;
 211
 212         /* Ignore this unit when snapshotting */
 213         bool ignore_on_snapshot;
 214
 215         /* Did the last condition check succeed? */
 216         bool condition_result;
 217         bool assert_result;
 218
 219         /* Is this a transient unit? */
 220         bool transient;
 221
 222         bool in_load_queue:1;
 223         bool in_dbus_queue:1;
 224         bool in_cleanup_queue:1;
 225         bool in_gc_queue:1;
 226         bool in_cgroup_queue:1;
 227
 228         bool sent_dbus_new_signal:1;
 229
 230         bool no_gc:1;
 231
 232         bool in_audit:1;
 233
 234         bool cgroup_realized:1;
 235         bool cgroup_members_mask_valid:1;
 236         bool cgroup_subtree_mask_valid:1;
 237
 238         /* Did we already invoke unit_coldplug() for this unit? */
 239         bool coldplugged:1;
 240 };
 241
 242 struct UnitStatusMessageFormats {
 243         const char *starting_stopping[2];
 244         const char *finished_start_job[_JOB_RESULT_MAX];
 245         const char *finished_stop_job[_JOB_RESULT_MAX];
 246 };
 247
 248 typedef enum UnitSetPropertiesMode {
 249         UNIT_CHECK = 0,
 250         UNIT_RUNTIME = 1,
 251         UNIT_PERSISTENT = 2,
 252 } UnitSetPropertiesMode;
 253
 254 #include "socket.h"
 255 #include "busname.h"
 256 #include "target.h"
 257 #include "snapshot.h"
 258 #include "device.h"
 259 #include "automount.h"
 260 #include "swap.h"
 261 #include "timer.h"
 262 #include "slice.h"
 263 #include "path.h"
 264 #include "scope.h"
 265
 266 struct UnitVTable {
 267         /* How much memory does an object of this unit type need */
 268         size_t object_size;
 269
 270         /* If greater than 0, the offset into the object where
 271          * ExecContext is found, if the unit type has that */
 272         size_t exec_context_offset;
 273
 274         /* If greater than 0, the offset into the object where
 275          * CGroupContext is found, if the unit type has that */
 276         size_t cgroup_context_offset;
 277
 278         /* If greater than 0, the offset into the object where
 279          * KillContext is found, if the unit type has that */
 280         size_t kill_context_offset;
 281
 282         /* If greater than 0, the offset into the object where the
 283          * pointer to ExecRuntime is found, if the unit type has
 284          * that */
 285         size_t exec_runtime_offset;
 286
 287         /* The name of the configuration file section with the private settings of this unit */
 288         const char *private_section;
 289
 290         /* Config file sections this unit type understands, separated
 291          * by NUL chars */
 292         const char *sections;
 293
 294         /* This should reset all type-specific variables. This should
 295          * not allocate memory, and is called with zero-initialized
 296          * data. It should hence only initialize variables that need
 297          * to be set != 0. */
 298         void (*init)(Unit *u);
 299
 300         /* This should free all type-specific variables. It should be
 301          * idempotent. */
 302         void (*done)(Unit *u);
 303
 304         /* Actually load data from disk. This may fail, and should set
 305          * load_state to UNIT_LOADED, UNIT_MERGED or leave it at
 306          * UNIT_STUB if no configuration could be found. */
 307         int (*load)(Unit *u);
 308
 309         /* If a lot of units got created via enumerate(), this is
 310          * where to actually set the state and call unit_notify(). */
 311         int (*coldplug)(Unit *u);
 312
 313         void (*dump)(Unit *u, FILE *f, const char *prefix);
 314
 315         int (*start)(Unit *u);
 316         int (*stop)(Unit *u);
 317         int (*reload)(Unit *u);
 318
 319         int (*kill)(Unit *u, KillWho w, int signo, sd_bus_error *error);
 320
 321         bool (*can_reload)(Unit *u);
 322
 323         /* Write all data that cannot be restored from other sources
 324          * away using unit_serialize_item() */
 325         int (*serialize)(Unit *u, FILE *f, FDSet *fds);
 326
 327         /* Restore one item from the serialization */
 328         int (*deserialize_item)(Unit *u, const char *key, const char *data, FDSet *fds);
 329
 330         /* Try to match up fds with what we need for this unit */
 331         int (*distribute_fds)(Unit *u, FDSet *fds);
 332
 333         /* Boils down the more complex internal state of this unit to
 334          * a simpler one that the engine can understand */
 335         UnitActiveState (*active_state)(Unit *u);
 336
 337         /* Returns the substate specific to this unit type as
 338          * string. This is purely information so that we can give the
 339          * user a more fine grained explanation in which actual state a
 340          * unit is in. */
 341         const char* (*sub_state_to_string)(Unit *u);
 342
 343         /* Return true when there is reason to keep this entry around
 344          * even nothing references it and it isn't active in any
 345          * way */
 346         bool (*check_gc)(Unit *u);
 347
 348         /* When the unit is not running and no job for it queued we
 349          * shall release its runtime resources */
 350         void (*release_resources)(Unit *u);
 351
 352         /* Return true when this unit is suitable for snapshotting */
 353         bool (*check_snapshot)(Unit *u);
 354
 355         /* Invoked on every child that died */
 356         void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
 357
 358         /* Reset failed state if we are in failed state */
 359         void (*reset_failed)(Unit *u);
 360
 361         /* Called whenever any of the cgroups this unit watches for
 362          * ran empty */
 363         void (*notify_cgroup_empty)(Unit *u);
 364
 365         /* Called whenever a process of this unit sends us a message */
 366         void (*notify_message)(Unit *u, pid_t pid, char **tags, FDSet *fds);
 367
 368         /* Called whenever a name this Unit registered for comes or
 369          * goes away. */
 370         void (*bus_name_owner_change)(Unit *u, const char *name, const char *old_owner, const char *new_owner);
 371
 372         /* Called for each property that is being set */
 373         int (*bus_set_property)(Unit *u, const char *name, sd_bus_message *message, UnitSetPropertiesMode mode, sd_bus_error *error);
 374
 375         /* Called after at least one property got changed to apply the necessary change */
 376         int (*bus_commit_properties)(Unit *u);
 377
 378         /* Return the unit this unit is following */
 379         Unit *(*following)(Unit *u);
 380
 381         /* Return the set of units that are following each other */
 382         int (*following_set)(Unit *u, Set **s);
 383
 384         /* Invoked each time a unit this unit is triggering changes
 385          * state or gains/loses a job */
 386         void (*trigger_notify)(Unit *u, Unit *trigger);
 387
 388         /* Called whenever CLOCK_REALTIME made a jump */
 389         void (*time_change)(Unit *u);
 390
 391         int (*get_timeout)(Unit *u, uint64_t *timeout);
 392
 393         /* This is called for each unit type and should be used to
 394          * enumerate existing devices and load them. However,
 395          * everything that is loaded here should still stay in
 396          * inactive state. It is the job of the coldplug() call above
 397          * to put the units into the initial state.  */
 398         int (*enumerate)(Manager *m);
 399
 400         /* Type specific cleanups. */
 401         void (*shutdown)(Manager *m);
 402
 403         /* If this function is set and return false all jobs for units
 404          * of this type will immediately fail. */
 405         bool (*supported)(void);
 406
 407         /* The bus vtable */
 408         const sd_bus_vtable *bus_vtable;
 409
 410         /* The strings to print in status messages */
 411         UnitStatusMessageFormats status_message_formats;
 412
 413         /* Can units of this type have multiple names? */
 414         bool no_alias:1;
 415
 416         /* Instances make no sense for this type */
 417         bool no_instances:1;
 418
 419         /* Exclude from automatic gc */
 420         bool no_gc:1;
 421
 422         /* True if transient units of this type are OK */
 423         bool can_transient:1;
 424 };
 425
 426 extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
 427
 428 #define UNIT_VTABLE(u) unit_vtable[(u)->type]
 429
 430 /* For casting a unit into the various unit types */
 431 #define DEFINE_CAST(UPPERCASE, MixedCase)                               \
 432         static inline MixedCase* UPPERCASE(Unit *u) {                   \
 433                 if (_unlikely_(!u || u->type != UNIT_##UPPERCASE))      \
 434                         return NULL;                                    \
 435                                                                         \
 436                 return (MixedCase*) u;                                  \
 437         }
 438
 439 /* For casting the various unit types into a unit */
 440 #define UNIT(u) (&(u)->meta)
 441
 442 #define UNIT_HAS_EXEC_CONTEXT(u) (UNIT_VTABLE(u)->exec_context_offset > 0)
 443 #define UNIT_HAS_CGROUP_CONTEXT(u) (UNIT_VTABLE(u)->cgroup_context_offset > 0)
 444 #define UNIT_HAS_KILL_CONTEXT(u) (UNIT_VTABLE(u)->kill_context_offset > 0)
 445
 446 #define UNIT_TRIGGER(u) ((Unit*) set_first((u)->dependencies[UNIT_TRIGGERS]))
 447
 448 DEFINE_CAST(SERVICE, Service);
 449 DEFINE_CAST(SOCKET, Socket);
 450 DEFINE_CAST(BUSNAME, BusName);
 451 DEFINE_CAST(TARGET, Target);
 452 DEFINE_CAST(SNAPSHOT, Snapshot);
 453 DEFINE_CAST(DEVICE, Device);
 454 DEFINE_CAST(MOUNT, Mount);
 455 DEFINE_CAST(AUTOMOUNT, Automount);
 456 DEFINE_CAST(SWAP, Swap);
 457 DEFINE_CAST(TIMER, Timer);
 458 DEFINE_CAST(PATH, Path);
 459 DEFINE_CAST(SLICE, Slice);
 460 DEFINE_CAST(SCOPE, Scope);
 461
 462 Unit *unit_new(Manager *m, size_t size);
 463 void unit_free(Unit *u);
 464
 465 int unit_add_name(Unit *u, const char *name);
 466
 467 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference);
 468 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference);
 469
 470 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
 471 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
 472
 473 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
 474 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
 475
 476 int unit_add_exec_dependencies(Unit *u, ExecContext *c);
 477
 478 int unit_choose_id(Unit *u, const char *name);
 479 int unit_set_description(Unit *u, const char *description);
 480
 481 bool unit_check_gc(Unit *u);
 482
 483 void unit_add_to_load_queue(Unit *u);
 484 void unit_add_to_dbus_queue(Unit *u);
 485 void unit_add_to_cleanup_queue(Unit *u);
 486 void unit_add_to_gc_queue(Unit *u);
 487
 488 int unit_merge(Unit *u, Unit *other);
 489 int unit_merge_by_name(Unit *u, const char *other);
 490
 491 Unit *unit_follow_merge(Unit *u) _pure_;
 492
 493 int unit_load_fragment_and_dropin(Unit *u);
 494 int unit_load_fragment_and_dropin_optional(Unit *u);
 495 int unit_load(Unit *unit);
 496
 497 int unit_set_slice(Unit *u, Unit *slice);
 498 int unit_set_default_slice(Unit *u);
 499
 500 const char *unit_description(Unit *u) _pure_;
 501
 502 bool unit_has_name(Unit *u, const char *name);
 503
 504 UnitActiveState unit_active_state(Unit *u);
 505
 506 const char* unit_sub_state_to_string(Unit *u);
 507
 508 void unit_dump(Unit *u, FILE *f, const char *prefix);
 509
 510 bool unit_can_reload(Unit *u) _pure_;
 511 bool unit_can_start(Unit *u) _pure_;
 512 bool unit_can_isolate(Unit *u) _pure_;
 513
 514 int unit_start(Unit *u);
 515 int unit_stop(Unit *u);
 516 int unit_reload(Unit *u);
 517
 518 int unit_kill(Unit *u, KillWho w, int signo, sd_bus_error *error);
 519 int unit_kill_common(Unit *u, KillWho who, int signo, pid_t main_pid, pid_t control_pid, sd_bus_error *error);
 520
 521 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success);
 522
 523 int unit_watch_pid(Unit *u, pid_t pid);
 524 void unit_unwatch_pid(Unit *u, pid_t pid);
 525 int unit_watch_all_pids(Unit *u);
 526 void unit_unwatch_all_pids(Unit *u);
 527
 528 void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2);
 529
 530 int unit_install_bus_match(sd_bus *bus, Unit *u, const char *name);
 531 int unit_watch_bus_name(Unit *u, const char *name);
 532 void unit_unwatch_bus_name(Unit *u, const char *name);
 533
 534 bool unit_job_is_applicable(Unit *u, JobType j);
 535
 536 int set_unit_path(const char *p);
 537
 538 char *unit_dbus_path(Unit *u);
 539
 540 int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
 541
 542 bool unit_can_serialize(Unit *u) _pure_;
 543 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs);
 544 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_(4,5);
 545 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value);
 546 int unit_deserialize(Unit *u, FILE *f, FDSet *fds);
 547
 548 int unit_add_node_link(Unit *u, const char *what, bool wants);
 549
 550 int unit_coldplug(Unit *u);
 551
 552 void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) _printf_(3, 0);
 553 void unit_status_emit_starting_stopping_reloading(Unit *u, JobType t);
 554
 555 bool unit_need_daemon_reload(Unit *u);
 556
 557 void unit_reset_failed(Unit *u);
 558
 559 Unit *unit_following(Unit *u);
 560 int unit_following_set(Unit *u, Set **s);
 561
 562 const char *unit_slice_name(Unit *u);
 563
 564 bool unit_stop_pending(Unit *u) _pure_;
 565 bool unit_inactive_or_pending(Unit *u) _pure_;
 566 bool unit_active_or_pending(Unit *u);
 567
 568 int unit_add_default_target_dependency(Unit *u, Unit *target);
 569
 570 char *unit_default_cgroup_path(Unit *u);
 571
 572 void unit_start_on_failure(Unit *u);
 573 void unit_trigger_notify(Unit *u);
 574
 575 UnitFileState unit_get_unit_file_state(Unit *u);
 576 int unit_get_unit_file_preset(Unit *u);
 577
 578 Unit* unit_ref_set(UnitRef *ref, Unit *u);
 579 void unit_ref_unset(UnitRef *ref);
 580
 581 #define UNIT_DEREF(ref) ((ref).unit)
 582 #define UNIT_ISSET(ref) (!!(ref).unit)
 583
 584 int unit_patch_contexts(Unit *u);
 585
 586 ExecContext *unit_get_exec_context(Unit *u) _pure_;
 587 KillContext *unit_get_kill_context(Unit *u) _pure_;
 588 CGroupContext *unit_get_cgroup_context(Unit *u) _pure_;
 589
 590 ExecRuntime *unit_get_exec_runtime(Unit *u) _pure_;
 591
 592 int unit_setup_exec_runtime(Unit *u);
 593
 594 int unit_write_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
 595 int unit_write_drop_in_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) _printf_(4,5);
 596
 597 int unit_write_drop_in_private(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
 598 int unit_write_drop_in_private_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) _printf_(4,5);
 599
 600 int unit_remove_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name);
 601
 602 int unit_kill_context(Unit *u, KillContext *c, KillOperation k, pid_t main_pid, pid_t control_pid, bool main_pid_alien);
 603
 604 int unit_make_transient(Unit *u);
 605
 606 int unit_require_mounts_for(Unit *u, const char *path);
 607
 608 bool unit_type_supported(UnitType t);
 609
 610 static inline bool unit_supported(Unit *u) {
 611         return unit_type_supported(u->type);
 612 }
 613
 614 void unit_warn_if_dir_nonempty(Unit *u, const char* where);
 615 int unit_fail_if_symlink(Unit *u, const char* where);
 616
 617 const char *unit_active_state_to_string(UnitActiveState i) _const_;
 618 UnitActiveState unit_active_state_from_string(const char *s) _pure_;
 619
 620 /* Macros which append UNIT= or USER_UNIT= to the message */
 621
 622 #define log_unit_full(unit, level, error, ...)                          \
 623         ({                                                              \
 624                 Unit *_u = (unit);                                      \
 625                 _u ? log_object_internal(level, error, __FILE__, __LINE__, __func__, _u->manager->unit_log_field, _u->id, ##__VA_ARGS__) : \
 626                         log_internal(level, error, __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
 627         })
 628
 629 #define log_unit_debug(unit, ...)   log_unit_full(unit, LOG_DEBUG, 0, ##__VA_ARGS__)
 630 #define log_unit_info(unit, ...)    log_unit_full(unit, LOG_INFO, 0, ##__VA_ARGS__)
 631 #define log_unit_notice(unit, ...)  log_unit_full(unit, LOG_NOTICE, 0, ##__VA_ARGS__)
 632 #define log_unit_warning(unit, ...) log_unit_full(unit, LOG_WARNING, 0, ##__VA_ARGS__)
 633 #define log_unit_error(unit, ...)   log_unit_full(unit, LOG_ERR, 0, ##__VA_ARGS__)
 634
 635 #define log_unit_debug_errno(unit, error, ...)   log_unit_full(unit, LOG_DEBUG, error, ##__VA_ARGS__)
 636 #define log_unit_info_errno(unit, error, ...)    log_unit_full(unit, LOG_INFO, error, ##__VA_ARGS__)
 637 #define log_unit_notice_errno(unit, error, ...)  log_unit_full(unit, LOG_NOTICE, error, ##__VA_ARGS__)
 638 #define log_unit_warning_errno(unit, error, ...) log_unit_full(unit, LOG_WARNING, error, ##__VA_ARGS__)
 639 #define log_unit_error_errno(unit, error, ...)   log_unit_full(unit, LOG_ERR, error, ##__VA_ARGS__)
 640
 641 #define LOG_UNIT_MESSAGE(unit, fmt, ...) "MESSAGE=%s: " fmt, (unit)->id, ##__VA_ARGS__
 642 #define LOG_UNIT_ID(unit) (unit)->manager->unit_log_format_string, (unit)->id