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         /* Units with the same CGroup netclass */
 165         LIST_FIELDS(Unit, cgroup_netclass);
 166
 167         /* PIDs we keep an eye on. Note that a unit might have many
 168          * more, but these are the ones we care enough about to
 169          * process SIGCHLD for */
 170         Set *pids;
 171
 172         /* Used during GC sweeps */
 173         unsigned gc_marker;
 174
 175         /* Error code when we didn't manage to load the unit (negative) */
 176         int load_error;
 177
 178         /* Make sure we never enter endless loops with the check unneeded logic, or the BindsTo= logic */
 179         RateLimit auto_stop_ratelimit;
 180
 181         /* Cached unit file state and preset */
 182         UnitFileState unit_file_state;
 183         int unit_file_preset;
 184
 185         /* Where the cpuacct.usage cgroup counter was at the time the unit was started */
 186         nsec_t cpuacct_usage_base;
 187
 188         /* Counterparts in the cgroup filesystem */
 189         char *cgroup_path;
 190         CGroupMask cgroup_realized_mask;
 191         CGroupMask cgroup_subtree_mask;
 192         CGroupMask cgroup_members_mask;
 193         int cgroup_inotify_wd;
 194
 195         uint32_t cgroup_netclass_id;
 196
 197         /* How to start OnFailure units */
 198         JobMode on_failure_job_mode;
 199
 200         /* Garbage collect us we nobody wants or requires us anymore */
 201         bool stop_when_unneeded;
 202
 203         /* Create default dependencies */
 204         bool default_dependencies;
 205
 206         /* Refuse manual starting, allow starting only indirectly via dependency. */
 207         bool refuse_manual_start;
 208
 209         /* Don't allow the user to stop this unit manually, allow stopping only indirectly via dependency. */
 210         bool refuse_manual_stop;
 211
 212         /* Allow isolation requests */
 213         bool allow_isolate;
 214
 215         /* Ignore this unit when isolating */
 216         bool ignore_on_isolate;
 217
 218         /* Ignore this unit when snapshotting */
 219         bool ignore_on_snapshot;
 220
 221         /* Did the last condition check succeed? */
 222         bool condition_result;
 223         bool assert_result;
 224
 225         /* Is this a transient unit? */
 226         bool transient;
 227
 228         bool in_load_queue:1;
 229         bool in_dbus_queue:1;
 230         bool in_cleanup_queue:1;
 231         bool in_gc_queue:1;
 232         bool in_cgroup_queue:1;
 233
 234         bool sent_dbus_new_signal:1;
 235
 236         bool no_gc:1;
 237
 238         bool in_audit:1;
 239
 240         bool cgroup_realized:1;
 241         bool cgroup_members_mask_valid:1;
 242         bool cgroup_subtree_mask_valid:1;
 243
 244         /* Did we already invoke unit_coldplug() for this unit? */
 245         bool coldplugged:1;
 246 };
 247
 248 struct UnitStatusMessageFormats {
 249         const char *starting_stopping[2];
 250         const char *finished_start_job[_JOB_RESULT_MAX];
 251         const char *finished_stop_job[_JOB_RESULT_MAX];
 252 };
 253
 254 typedef enum UnitSetPropertiesMode {
 255         UNIT_CHECK = 0,
 256         UNIT_RUNTIME = 1,
 257         UNIT_PERSISTENT = 2,
 258 } UnitSetPropertiesMode;
 259
 260 #include "socket.h"
 261 #include "busname.h"
 262 #include "target.h"
 263 #include "snapshot.h"
 264 #include "device.h"
 265 #include "automount.h"
 266 #include "swap.h"
 267 #include "timer.h"
 268 #include "slice.h"
 269 #include "path.h"
 270 #include "scope.h"
 271
 272 struct UnitVTable {
 273         /* How much memory does an object of this unit type need */
 274         size_t object_size;
 275
 276         /* If greater than 0, the offset into the object where
 277          * ExecContext is found, if the unit type has that */
 278         size_t exec_context_offset;
 279
 280         /* If greater than 0, the offset into the object where
 281          * CGroupContext is found, if the unit type has that */
 282         size_t cgroup_context_offset;
 283
 284         /* If greater than 0, the offset into the object where
 285          * KillContext is found, if the unit type has that */
 286         size_t kill_context_offset;
 287
 288         /* If greater than 0, the offset into the object where the
 289          * pointer to ExecRuntime is found, if the unit type has
 290          * that */
 291         size_t exec_runtime_offset;
 292
 293         /* The name of the configuration file section with the private settings of this unit */
 294         const char *private_section;
 295
 296         /* Config file sections this unit type understands, separated
 297          * by NUL chars */
 298         const char *sections;
 299
 300         /* This should reset all type-specific variables. This should
 301          * not allocate memory, and is called with zero-initialized
 302          * data. It should hence only initialize variables that need
 303          * to be set != 0. */
 304         void (*init)(Unit *u);
 305
 306         /* This should free all type-specific variables. It should be
 307          * idempotent. */
 308         void (*done)(Unit *u);
 309
 310         /* Actually load data from disk. This may fail, and should set
 311          * load_state to UNIT_LOADED, UNIT_MERGED or leave it at
 312          * UNIT_STUB if no configuration could be found. */
 313         int (*load)(Unit *u);
 314
 315         /* If a lot of units got created via enumerate(), this is
 316          * where to actually set the state and call unit_notify(). */
 317         int (*coldplug)(Unit *u);
 318
 319         void (*dump)(Unit *u, FILE *f, const char *prefix);
 320
 321         int (*start)(Unit *u);
 322         int (*stop)(Unit *u);
 323         int (*reload)(Unit *u);
 324
 325         int (*kill)(Unit *u, KillWho w, int signo, sd_bus_error *error);
 326
 327         bool (*can_reload)(Unit *u);
 328
 329         /* Write all data that cannot be restored from other sources
 330          * away using unit_serialize_item() */
 331         int (*serialize)(Unit *u, FILE *f, FDSet *fds);
 332
 333         /* Restore one item from the serialization */
 334         int (*deserialize_item)(Unit *u, const char *key, const char *data, FDSet *fds);
 335
 336         /* Try to match up fds with what we need for this unit */
 337         int (*distribute_fds)(Unit *u, FDSet *fds);
 338
 339         /* Boils down the more complex internal state of this unit to
 340          * a simpler one that the engine can understand */
 341         UnitActiveState (*active_state)(Unit *u);
 342
 343         /* Returns the substate specific to this unit type as
 344          * string. This is purely information so that we can give the
 345          * user a more fine grained explanation in which actual state a
 346          * unit is in. */
 347         const char* (*sub_state_to_string)(Unit *u);
 348
 349         /* Return true when there is reason to keep this entry around
 350          * even nothing references it and it isn't active in any
 351          * way */
 352         bool (*check_gc)(Unit *u);
 353
 354         /* When the unit is not running and no job for it queued we
 355          * shall release its runtime resources */
 356         void (*release_resources)(Unit *u);
 357
 358         /* Return true when this unit is suitable for snapshotting */
 359         bool (*check_snapshot)(Unit *u);
 360
 361         /* Invoked on every child that died */
 362         void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
 363
 364         /* Reset failed state if we are in failed state */
 365         void (*reset_failed)(Unit *u);
 366
 367         /* Called whenever any of the cgroups this unit watches for
 368          * ran empty */
 369         void (*notify_cgroup_empty)(Unit *u);
 370
 371         /* Called whenever a process of this unit sends us a message */
 372         void (*notify_message)(Unit *u, pid_t pid, char **tags, FDSet *fds);
 373
 374         /* Called whenever a name this Unit registered for comes or
 375          * goes away. */
 376         void (*bus_name_owner_change)(Unit *u, const char *name, const char *old_owner, const char *new_owner);
 377
 378         /* Called for each property that is being set */
 379         int (*bus_set_property)(Unit *u, const char *name, sd_bus_message *message, UnitSetPropertiesMode mode, sd_bus_error *error);
 380
 381         /* Called after at least one property got changed to apply the necessary change */
 382         int (*bus_commit_properties)(Unit *u);
 383
 384         /* Return the unit this unit is following */
 385         Unit *(*following)(Unit *u);
 386
 387         /* Return the set of units that are following each other */
 388         int (*following_set)(Unit *u, Set **s);
 389
 390         /* Invoked each time a unit this unit is triggering changes
 391          * state or gains/loses a job */
 392         void (*trigger_notify)(Unit *u, Unit *trigger);
 393
 394         /* Called whenever CLOCK_REALTIME made a jump */
 395         void (*time_change)(Unit *u);
 396
 397         int (*get_timeout)(Unit *u, uint64_t *timeout);
 398
 399         /* This is called for each unit type and should be used to
 400          * enumerate existing devices and load them. However,
 401          * everything that is loaded here should still stay in
 402          * inactive state. It is the job of the coldplug() call above
 403          * to put the units into the initial state.  */
 404         int (*enumerate)(Manager *m);
 405
 406         /* Type specific cleanups. */
 407         void (*shutdown)(Manager *m);
 408
 409         /* If this function is set and return false all jobs for units
 410          * of this type will immediately fail. */
 411         bool (*supported)(void);
 412
 413         /* The bus vtable */
 414         const sd_bus_vtable *bus_vtable;
 415
 416         /* The strings to print in status messages */
 417         UnitStatusMessageFormats status_message_formats;
 418
 419         /* Can units of this type have multiple names? */
 420         bool no_alias:1;
 421
 422         /* Instances make no sense for this type */
 423         bool no_instances:1;
 424
 425         /* Exclude from automatic gc */
 426         bool no_gc:1;
 427
 428         /* True if transient units of this type are OK */
 429         bool can_transient:1;
 430 };
 431
 432 extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
 433
 434 #define UNIT_VTABLE(u) unit_vtable[(u)->type]
 435
 436 /* For casting a unit into the various unit types */
 437 #define DEFINE_CAST(UPPERCASE, MixedCase)                               \
 438         static inline MixedCase* UPPERCASE(Unit *u) {                   \
 439                 if (_unlikely_(!u || u->type != UNIT_##UPPERCASE))      \
 440                         return NULL;                                    \
 441                                                                         \
 442                 return (MixedCase*) u;                                  \
 443         }
 444
 445 /* For casting the various unit types into a unit */
 446 #define UNIT(u) (&(u)->meta)
 447
 448 #define UNIT_HAS_EXEC_CONTEXT(u) (UNIT_VTABLE(u)->exec_context_offset > 0)
 449 #define UNIT_HAS_CGROUP_CONTEXT(u) (UNIT_VTABLE(u)->cgroup_context_offset > 0)
 450 #define UNIT_HAS_KILL_CONTEXT(u) (UNIT_VTABLE(u)->kill_context_offset > 0)
 451
 452 #define UNIT_TRIGGER(u) ((Unit*) set_first((u)->dependencies[UNIT_TRIGGERS]))
 453
 454 DEFINE_CAST(SERVICE, Service);
 455 DEFINE_CAST(SOCKET, Socket);
 456 DEFINE_CAST(BUSNAME, BusName);
 457 DEFINE_CAST(TARGET, Target);
 458 DEFINE_CAST(SNAPSHOT, Snapshot);
 459 DEFINE_CAST(DEVICE, Device);
 460 DEFINE_CAST(MOUNT, Mount);
 461 DEFINE_CAST(AUTOMOUNT, Automount);
 462 DEFINE_CAST(SWAP, Swap);
 463 DEFINE_CAST(TIMER, Timer);
 464 DEFINE_CAST(PATH, Path);
 465 DEFINE_CAST(SLICE, Slice);
 466 DEFINE_CAST(SCOPE, Scope);
 467
 468 Unit *unit_new(Manager *m, size_t size);
 469 void unit_free(Unit *u);
 470
 471 int unit_add_name(Unit *u, const char *name);
 472
 473 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference);
 474 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference);
 475
 476 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
 477 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
 478
 479 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
 480 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
 481
 482 int unit_add_exec_dependencies(Unit *u, ExecContext *c);
 483
 484 int unit_choose_id(Unit *u, const char *name);
 485 int unit_set_description(Unit *u, const char *description);
 486
 487 bool unit_check_gc(Unit *u);
 488
 489 void unit_add_to_load_queue(Unit *u);
 490 void unit_add_to_dbus_queue(Unit *u);
 491 void unit_add_to_cleanup_queue(Unit *u);
 492 void unit_add_to_gc_queue(Unit *u);
 493
 494 int unit_merge(Unit *u, Unit *other);
 495 int unit_merge_by_name(Unit *u, const char *other);
 496
 497 Unit *unit_follow_merge(Unit *u) _pure_;
 498
 499 int unit_load_fragment_and_dropin(Unit *u);
 500 int unit_load_fragment_and_dropin_optional(Unit *u);
 501 int unit_load(Unit *unit);
 502
 503 int unit_set_slice(Unit *u, Unit *slice);
 504 int unit_set_default_slice(Unit *u);
 505
 506 const char *unit_description(Unit *u) _pure_;
 507
 508 bool unit_has_name(Unit *u, const char *name);
 509
 510 UnitActiveState unit_active_state(Unit *u);
 511
 512 const char* unit_sub_state_to_string(Unit *u);
 513
 514 void unit_dump(Unit *u, FILE *f, const char *prefix);
 515
 516 bool unit_can_reload(Unit *u) _pure_;
 517 bool unit_can_start(Unit *u) _pure_;
 518 bool unit_can_isolate(Unit *u) _pure_;
 519
 520 int unit_start(Unit *u);
 521 int unit_stop(Unit *u);
 522 int unit_reload(Unit *u);
 523
 524 int unit_kill(Unit *u, KillWho w, int signo, sd_bus_error *error);
 525 int unit_kill_common(Unit *u, KillWho who, int signo, pid_t main_pid, pid_t control_pid, sd_bus_error *error);
 526
 527 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success);
 528
 529 int unit_watch_pid(Unit *u, pid_t pid);
 530 void unit_unwatch_pid(Unit *u, pid_t pid);
 531 void unit_unwatch_all_pids(Unit *u);
 532
 533 void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2);
 534
 535 int unit_install_bus_match(sd_bus *bus, Unit *u, const char *name);
 536 int unit_watch_bus_name(Unit *u, const char *name);
 537 void unit_unwatch_bus_name(Unit *u, const char *name);
 538
 539 bool unit_job_is_applicable(Unit *u, JobType j);
 540
 541 int set_unit_path(const char *p);
 542
 543 char *unit_dbus_path(Unit *u);
 544
 545 int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
 546
 547 bool unit_can_serialize(Unit *u) _pure_;
 548 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs);
 549 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_(4,5);
 550 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value);
 551 int unit_deserialize(Unit *u, FILE *f, FDSet *fds);
 552
 553 int unit_add_node_link(Unit *u, const char *what, bool wants);
 554
 555 int unit_coldplug(Unit *u);
 556
 557 void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) _printf_(3, 0);
 558 void unit_status_emit_starting_stopping_reloading(Unit *u, JobType t);
 559
 560 bool unit_need_daemon_reload(Unit *u);
 561
 562 void unit_reset_failed(Unit *u);
 563
 564 Unit *unit_following(Unit *u);
 565 int unit_following_set(Unit *u, Set **s);
 566
 567 const char *unit_slice_name(Unit *u);
 568
 569 bool unit_stop_pending(Unit *u) _pure_;
 570 bool unit_inactive_or_pending(Unit *u) _pure_;
 571 bool unit_active_or_pending(Unit *u);
 572
 573 int unit_add_default_target_dependency(Unit *u, Unit *target);
 574
 575 void unit_start_on_failure(Unit *u);
 576 void unit_trigger_notify(Unit *u);
 577
 578 UnitFileState unit_get_unit_file_state(Unit *u);
 579 int unit_get_unit_file_preset(Unit *u);
 580
 581 Unit* unit_ref_set(UnitRef *ref, Unit *u);
 582 void unit_ref_unset(UnitRef *ref);
 583
 584 #define UNIT_DEREF(ref) ((ref).unit)
 585 #define UNIT_ISSET(ref) (!!(ref).unit)
 586
 587 int unit_patch_contexts(Unit *u);
 588
 589 ExecContext *unit_get_exec_context(Unit *u) _pure_;
 590 KillContext *unit_get_kill_context(Unit *u) _pure_;
 591 CGroupContext *unit_get_cgroup_context(Unit *u) _pure_;
 592
 593 ExecRuntime *unit_get_exec_runtime(Unit *u) _pure_;
 594
 595 int unit_setup_exec_runtime(Unit *u);
 596
 597 int unit_write_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
 598 int unit_write_drop_in_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) _printf_(4,5);
 599
 600 int unit_write_drop_in_private(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
 601 int unit_write_drop_in_private_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) _printf_(4,5);
 602
 603 int unit_remove_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name);
 604
 605 int unit_kill_context(Unit *u, KillContext *c, KillOperation k, pid_t main_pid, pid_t control_pid, bool main_pid_alien);
 606
 607 int unit_make_transient(Unit *u);
 608
 609 int unit_require_mounts_for(Unit *u, const char *path);
 610
 611 bool unit_type_supported(UnitType t);
 612
 613 static inline bool unit_supported(Unit *u) {
 614         return unit_type_supported(u->type);
 615 }
 616
 617 void unit_warn_if_dir_nonempty(Unit *u, const char* where);
 618 int unit_fail_if_symlink(Unit *u, const char* where);
 619
 620 const char *unit_active_state_to_string(UnitActiveState i) _const_;
 621 UnitActiveState unit_active_state_from_string(const char *s) _pure_;
 622
 623 /* Macros which append UNIT= or USER_UNIT= to the message */
 624
 625 #define log_unit_full(unit, level, error, ...)                          \
 626         ({                                                              \
 627                 Unit *_u = (unit);                                      \
 628                 _u ? log_object_internal(level, error, __FILE__, __LINE__, __func__, _u->manager->unit_log_field, _u->id, ##__VA_ARGS__) : \
 629                         log_internal(level, error, __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
 630         })
 631
 632 #define log_unit_debug(unit, ...)   log_unit_full(unit, LOG_DEBUG, 0, ##__VA_ARGS__)
 633 #define log_unit_info(unit, ...)    log_unit_full(unit, LOG_INFO, 0, ##__VA_ARGS__)
 634 #define log_unit_notice(unit, ...)  log_unit_full(unit, LOG_NOTICE, 0, ##__VA_ARGS__)
 635 #define log_unit_warning(unit, ...) log_unit_full(unit, LOG_WARNING, 0, ##__VA_ARGS__)
 636 #define log_unit_error(unit, ...)   log_unit_full(unit, LOG_ERR, 0, ##__VA_ARGS__)
 637
 638 #define log_unit_debug_errno(unit, error, ...)   log_unit_full(unit, LOG_DEBUG, error, ##__VA_ARGS__)
 639 #define log_unit_info_errno(unit, error, ...)    log_unit_full(unit, LOG_INFO, error, ##__VA_ARGS__)
 640 #define log_unit_notice_errno(unit, error, ...)  log_unit_full(unit, LOG_NOTICE, error, ##__VA_ARGS__)
 641 #define log_unit_warning_errno(unit, error, ...) log_unit_full(unit, LOG_WARNING, error, ##__VA_ARGS__)
 642 #define log_unit_error_errno(unit, error, ...)   log_unit_full(unit, LOG_ERR, error, ##__VA_ARGS__)
 643
 644 #define LOG_UNIT_MESSAGE(unit, fmt, ...) "MESSAGE=%s: " fmt, (unit)->id, ##__VA_ARGS__
 645 #define LOG_UNIT_ID(unit) (unit)->manager->unit_log_format_string, (unit)->id