src/core/unit.h

   1 #pragma once
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <stdbool.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 typedef struct Unit Unit;
  27 typedef struct UnitVTable UnitVTable;
  28 typedef struct UnitRef UnitRef;
  29 typedef struct UnitStatusMessageFormats UnitStatusMessageFormats;
  30
  31 #include "condition.h"
  32 #include "failure-action.h"
  33 #include "install.h"
  34 #include "list.h"
  35 #include "unit-name.h"
  36
  37 typedef enum KillOperation {
  38         KILL_TERMINATE,
  39         KILL_TERMINATE_AND_LOG,
  40         KILL_KILL,
  41         KILL_ABORT,
  42         _KILL_OPERATION_MAX,
  43         _KILL_OPERATION_INVALID = -1
  44 } KillOperation;
  45
  46 static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) {
  47         return t == UNIT_ACTIVE || t == UNIT_RELOADING;
  48 }
  49
  50 static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t) {
  51         return t == UNIT_ACTIVE || t == UNIT_ACTIVATING || t == UNIT_RELOADING;
  52 }
  53
  54 static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t) {
  55         return t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING;
  56 }
  57
  58 static inline bool UNIT_IS_INACTIVE_OR_FAILED(UnitActiveState t) {
  59         return t == UNIT_INACTIVE || t == UNIT_FAILED;
  60 }
  61
  62 #include "job.h"
  63
  64 struct UnitRef {
  65         /* Keeps tracks of references to a unit. This is useful so
  66          * that we can merge two units if necessary and correct all
  67          * references to them */
  68
  69         Unit* unit;
  70         LIST_FIELDS(UnitRef, refs);
  71 };
  72
  73 struct Unit {
  74         Manager *manager;
  75
  76         UnitType type;
  77         UnitLoadState load_state;
  78         Unit *merged_into;
  79
  80         char *id; /* One name is special because we use it for identification. Points to an entry in the names set */
  81         char *instance;
  82
  83         Set *names;
  84         Set *dependencies[_UNIT_DEPENDENCY_MAX];
  85
  86         char **requires_mounts_for;
  87
  88         char *description;
  89         char **documentation;
  90
  91         char *fragment_path; /* if loaded from a config file this is the primary path to it */
  92         char *source_path; /* if converted, the source file */
  93         char **dropin_paths;
  94
  95         usec_t fragment_mtime;
  96         usec_t source_mtime;
  97         usec_t dropin_mtime;
  98
  99         /* If this is a transient unit we are currently writing, this is where we are writing it to */
 100         FILE *transient_file;
 101
 102         /* If there is something to do with this unit, then this is the installed job for it */
 103         Job *job;
 104
 105         /* JOB_NOP jobs are special and can be installed without disturbing the real job. */
 106         Job *nop_job;
 107
 108         /* The slot used for watching NameOwnerChanged signals */
 109         sd_bus_slot *match_bus_slot;
 110
 111         /* References to this unit from clients */
 112         sd_bus_track *bus_track;
 113         char **deserialized_refs;
 114
 115         /* Job timeout and action to take */
 116         usec_t job_timeout;
 117         FailureAction job_timeout_action;
 118         char *job_timeout_reboot_arg;
 119
 120         /* References to this */
 121         LIST_HEAD(UnitRef, refs);
 122
 123         /* Conditions to check */
 124         LIST_HEAD(Condition, conditions);
 125         LIST_HEAD(Condition, asserts);
 126
 127         dual_timestamp condition_timestamp;
 128         dual_timestamp assert_timestamp;
 129
 130         /* Updated whenever the low-level state changes */
 131         dual_timestamp state_change_timestamp;
 132
 133         /* Updated whenever the (high-level) active state enters or leaves the active or inactive states */
 134         dual_timestamp inactive_exit_timestamp;
 135         dual_timestamp active_enter_timestamp;
 136         dual_timestamp active_exit_timestamp;
 137         dual_timestamp inactive_enter_timestamp;
 138
 139         UnitRef slice;
 140
 141         /* Per type list */
 142         LIST_FIELDS(Unit, units_by_type);
 143
 144         /* All units which have requires_mounts_for set */
 145         LIST_FIELDS(Unit, has_requires_mounts_for);
 146
 147         /* Load queue */
 148         LIST_FIELDS(Unit, load_queue);
 149
 150         /* D-Bus queue */
 151         LIST_FIELDS(Unit, dbus_queue);
 152
 153         /* Cleanup queue */
 154         LIST_FIELDS(Unit, cleanup_queue);
 155
 156         /* GC queue */
 157         LIST_FIELDS(Unit, gc_queue);
 158
 159         /* CGroup realize members queue */
 160         LIST_FIELDS(Unit, cgroup_queue);
 161
 162         /* Units with the same CGroup netclass */
 163         LIST_FIELDS(Unit, cgroup_netclass);
 164
 165         /* PIDs we keep an eye on. Note that a unit might have many
 166          * more, but these are the ones we care enough about to
 167          * process SIGCHLD for */
 168         Set *pids;
 169
 170         /* Used in sigchld event invocation to avoid repeat events being invoked */
 171         uint64_t sigchldgen;
 172
 173         /* Used during GC sweeps */
 174         unsigned gc_marker;
 175
 176         /* Error code when we didn't manage to load the unit (negative) */
 177         int load_error;
 178
 179         /* Put a ratelimit on unit starting */
 180         RateLimit start_limit;
 181         FailureAction start_limit_action;
 182         char *reboot_arg;
 183
 184         /* Make sure we never enter endless loops with the check unneeded logic, or the BindsTo= logic */
 185         RateLimit auto_stop_ratelimit;
 186
 187         /* Reference to a specific UID/GID */
 188         uid_t ref_uid;
 189         gid_t ref_gid;
 190
 191         /* Cached unit file state and preset */
 192         UnitFileState unit_file_state;
 193         int unit_file_preset;
 194
 195         /* Where the cpu.stat or cpuacct.usage was at the time the unit was started */
 196         nsec_t cpu_usage_base;
 197         nsec_t cpu_usage_last; /* the most recently read value */
 198
 199         /* Counterparts in the cgroup filesystem */
 200         char *cgroup_path;
 201         CGroupMask cgroup_realized_mask;
 202         CGroupMask cgroup_enabled_mask;
 203         CGroupMask cgroup_subtree_mask;
 204         CGroupMask cgroup_members_mask;
 205         int cgroup_inotify_wd;
 206
 207         /* How to start OnFailure units */
 208         JobMode on_failure_job_mode;
 209
 210         /* Garbage collect us we nobody wants or requires us anymore */
 211         bool stop_when_unneeded;
 212
 213         /* Create default dependencies */
 214         bool default_dependencies;
 215
 216         /* Refuse manual starting, allow starting only indirectly via dependency. */
 217         bool refuse_manual_start;
 218
 219         /* Don't allow the user to stop this unit manually, allow stopping only indirectly via dependency. */
 220         bool refuse_manual_stop;
 221
 222         /* Allow isolation requests */
 223         bool allow_isolate;
 224
 225         /* Ignore this unit when isolating */
 226         bool ignore_on_isolate;
 227
 228         /* Did the last condition check succeed? */
 229         bool condition_result;
 230         bool assert_result;
 231
 232         /* Is this a transient unit? */
 233         bool transient;
 234
 235         bool in_load_queue:1;
 236         bool in_dbus_queue:1;
 237         bool in_cleanup_queue:1;
 238         bool in_gc_queue:1;
 239         bool in_cgroup_queue:1;
 240
 241         bool sent_dbus_new_signal:1;
 242
 243         bool no_gc:1;
 244
 245         bool in_audit:1;
 246
 247         bool cgroup_realized:1;
 248         bool cgroup_members_mask_valid:1;
 249         bool cgroup_subtree_mask_valid:1;
 250
 251         bool start_limit_hit:1;
 252
 253         /* Did we already invoke unit_coldplug() for this unit? */
 254         bool coldplugged:1;
 255
 256         /* For transient units: whether to add a bus track reference after creating the unit */
 257         bool bus_track_add:1;
 258 };
 259
 260 struct UnitStatusMessageFormats {
 261         const char *starting_stopping[2];
 262         const char *finished_start_job[_JOB_RESULT_MAX];
 263         const char *finished_stop_job[_JOB_RESULT_MAX];
 264 };
 265
 266 typedef enum UnitSetPropertiesMode {
 267         UNIT_CHECK = 0,
 268         UNIT_RUNTIME = 1,
 269         UNIT_PERSISTENT = 2,
 270 } UnitSetPropertiesMode;
 271
 272 #include "automount.h"
 273 #include "busname.h"
 274 #include "device.h"
 275 #include "path.h"
 276 #include "scope.h"
 277 #include "slice.h"
 278 #include "socket.h"
 279 #include "swap.h"
 280 #include "target.h"
 281 #include "timer.h"
 282
 283 struct UnitVTable {
 284         /* How much memory does an object of this unit type need */
 285         size_t object_size;
 286
 287         /* If greater than 0, the offset into the object where
 288          * ExecContext is found, if the unit type has that */
 289         size_t exec_context_offset;
 290
 291         /* If greater than 0, the offset into the object where
 292          * CGroupContext is found, if the unit type has that */
 293         size_t cgroup_context_offset;
 294
 295         /* If greater than 0, the offset into the object where
 296          * KillContext is found, if the unit type has that */
 297         size_t kill_context_offset;
 298
 299         /* If greater than 0, the offset into the object where the
 300          * pointer to ExecRuntime is found, if the unit type has
 301          * that */
 302         size_t exec_runtime_offset;
 303
 304         /* If greater than 0, the offset into the object where the pointer to DynamicCreds is found, if the unit type
 305          * has that. */
 306         size_t dynamic_creds_offset;
 307
 308         /* The name of the configuration file section with the private settings of this unit */
 309         const char *private_section;
 310
 311         /* Config file sections this unit type understands, separated
 312          * by NUL chars */
 313         const char *sections;
 314
 315         /* This should reset all type-specific variables. This should
 316          * not allocate memory, and is called with zero-initialized
 317          * data. It should hence only initialize variables that need
 318          * to be set != 0. */
 319         void (*init)(Unit *u);
 320
 321         /* This should free all type-specific variables. It should be
 322          * idempotent. */
 323         void (*done)(Unit *u);
 324
 325         /* Actually load data from disk. This may fail, and should set
 326          * load_state to UNIT_LOADED, UNIT_MERGED or leave it at
 327          * UNIT_STUB if no configuration could be found. */
 328         int (*load)(Unit *u);
 329
 330         /* If a lot of units got created via enumerate(), this is
 331          * where to actually set the state and call unit_notify(). */
 332         int (*coldplug)(Unit *u);
 333
 334         void (*dump)(Unit *u, FILE *f, const char *prefix);
 335
 336         int (*start)(Unit *u);
 337         int (*stop)(Unit *u);
 338         int (*reload)(Unit *u);
 339
 340         int (*kill)(Unit *u, KillWho w, int signo, sd_bus_error *error);
 341
 342         bool (*can_reload)(Unit *u);
 343
 344         /* Write all data that cannot be restored from other sources
 345          * away using unit_serialize_item() */
 346         int (*serialize)(Unit *u, FILE *f, FDSet *fds);
 347
 348         /* Restore one item from the serialization */
 349         int (*deserialize_item)(Unit *u, const char *key, const char *data, FDSet *fds);
 350
 351         /* Try to match up fds with what we need for this unit */
 352         void (*distribute_fds)(Unit *u, FDSet *fds);
 353
 354         /* Boils down the more complex internal state of this unit to
 355          * a simpler one that the engine can understand */
 356         UnitActiveState (*active_state)(Unit *u);
 357
 358         /* Returns the substate specific to this unit type as
 359          * string. This is purely information so that we can give the
 360          * user a more fine grained explanation in which actual state a
 361          * unit is in. */
 362         const char* (*sub_state_to_string)(Unit *u);
 363
 364         /* Return true when there is reason to keep this entry around
 365          * even nothing references it and it isn't active in any
 366          * way */
 367         bool (*check_gc)(Unit *u);
 368
 369         /* When the unit is not running and no job for it queued we
 370          * shall release its runtime resources */
 371         void (*release_resources)(Unit *u);
 372
 373         /* Invoked on every child that died */
 374         void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
 375
 376         /* Reset failed state if we are in failed state */
 377         void (*reset_failed)(Unit *u);
 378
 379         /* Called whenever any of the cgroups this unit watches for
 380          * ran empty */
 381         void (*notify_cgroup_empty)(Unit *u);
 382
 383         /* Called whenever a process of this unit sends us a message */
 384         void (*notify_message)(Unit *u, pid_t pid, char **tags, FDSet *fds);
 385
 386         /* Called whenever a name this Unit registered for comes or goes away. */
 387         void (*bus_name_owner_change)(Unit *u, const char *name, const char *old_owner, const char *new_owner);
 388
 389         /* Called for each property that is being set */
 390         int (*bus_set_property)(Unit *u, const char *name, sd_bus_message *message, UnitSetPropertiesMode mode, sd_bus_error *error);
 391
 392         /* Called after at least one property got changed to apply the necessary change */
 393         int (*bus_commit_properties)(Unit *u);
 394
 395         /* Return the unit this unit is following */
 396         Unit *(*following)(Unit *u);
 397
 398         /* Return the set of units that are following each other */
 399         int (*following_set)(Unit *u, Set **s);
 400
 401         /* Invoked each time a unit this unit is triggering changes
 402          * state or gains/loses a job */
 403         void (*trigger_notify)(Unit *u, Unit *trigger);
 404
 405         /* Called whenever CLOCK_REALTIME made a jump */
 406         void (*time_change)(Unit *u);
 407
 408         /* Returns the next timeout of a unit */
 409         int (*get_timeout)(Unit *u, usec_t *timeout);
 410
 411         /* Returns the main PID if there is any defined, or 0. */
 412         pid_t (*main_pid)(Unit *u);
 413
 414         /* Returns the main PID if there is any defined, or 0. */
 415         pid_t (*control_pid)(Unit *u);
 416
 417         /* This is called for each unit type and should be used to
 418          * enumerate existing devices and load them. However,
 419          * everything that is loaded here should still stay in
 420          * inactive state. It is the job of the coldplug() call above
 421          * to put the units into the initial state.  */
 422         void (*enumerate)(Manager *m);
 423
 424         /* Type specific cleanups. */
 425         void (*shutdown)(Manager *m);
 426
 427         /* If this function is set and return false all jobs for units
 428          * of this type will immediately fail. */
 429         bool (*supported)(void);
 430
 431         /* The bus vtable */
 432         const sd_bus_vtable *bus_vtable;
 433
 434         /* The strings to print in status messages */
 435         UnitStatusMessageFormats status_message_formats;
 436
 437         /* True if transient units of this type are OK */
 438         bool can_transient:1;
 439 };
 440
 441 extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
 442
 443 #define UNIT_VTABLE(u) unit_vtable[(u)->type]
 444
 445 /* For casting a unit into the various unit types */
 446 #define DEFINE_CAST(UPPERCASE, MixedCase)                               \
 447         static inline MixedCase* UPPERCASE(Unit *u) {                   \
 448                 if (_unlikely_(!u || u->type != UNIT_##UPPERCASE))      \
 449                         return NULL;                                    \
 450                                                                         \
 451                 return (MixedCase*) u;                                  \
 452         }
 453
 454 /* For casting the various unit types into a unit */
 455 #define UNIT(u) (&(u)->meta)
 456
 457 #define UNIT_HAS_EXEC_CONTEXT(u) (UNIT_VTABLE(u)->exec_context_offset > 0)
 458 #define UNIT_HAS_CGROUP_CONTEXT(u) (UNIT_VTABLE(u)->cgroup_context_offset > 0)
 459 #define UNIT_HAS_KILL_CONTEXT(u) (UNIT_VTABLE(u)->kill_context_offset > 0)
 460
 461 #define UNIT_TRIGGER(u) ((Unit*) set_first((u)->dependencies[UNIT_TRIGGERS]))
 462
 463 DEFINE_CAST(SERVICE, Service);
 464 DEFINE_CAST(SOCKET, Socket);
 465 DEFINE_CAST(BUSNAME, BusName);
 466 DEFINE_CAST(TARGET, Target);
 467 DEFINE_CAST(DEVICE, Device);
 468 DEFINE_CAST(MOUNT, Mount);
 469 DEFINE_CAST(AUTOMOUNT, Automount);
 470 DEFINE_CAST(SWAP, Swap);
 471 DEFINE_CAST(TIMER, Timer);
 472 DEFINE_CAST(PATH, Path);
 473 DEFINE_CAST(SLICE, Slice);
 474 DEFINE_CAST(SCOPE, Scope);
 475
 476 Unit *unit_new(Manager *m, size_t size);
 477 void unit_free(Unit *u);
 478
 479 int unit_add_name(Unit *u, const char *name);
 480
 481 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference);
 482 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference);
 483
 484 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference);
 485 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference);
 486
 487 int unit_add_exec_dependencies(Unit *u, ExecContext *c);
 488
 489 int unit_choose_id(Unit *u, const char *name);
 490 int unit_set_description(Unit *u, const char *description);
 491
 492 bool unit_check_gc(Unit *u);
 493
 494 void unit_add_to_load_queue(Unit *u);
 495 void unit_add_to_dbus_queue(Unit *u);
 496 void unit_add_to_cleanup_queue(Unit *u);
 497 void unit_add_to_gc_queue(Unit *u);
 498
 499 int unit_merge(Unit *u, Unit *other);
 500 int unit_merge_by_name(Unit *u, const char *other);
 501
 502 Unit *unit_follow_merge(Unit *u) _pure_;
 503
 504 int unit_load_fragment_and_dropin(Unit *u);
 505 int unit_load_fragment_and_dropin_optional(Unit *u);
 506 int unit_load(Unit *unit);
 507
 508 int unit_set_slice(Unit *u, Unit *slice);
 509 int unit_set_default_slice(Unit *u);
 510
 511 const char *unit_description(Unit *u) _pure_;
 512
 513 bool unit_has_name(Unit *u, const char *name);
 514
 515 UnitActiveState unit_active_state(Unit *u);
 516
 517 const char* unit_sub_state_to_string(Unit *u);
 518
 519 void unit_dump(Unit *u, FILE *f, const char *prefix);
 520
 521 bool unit_can_reload(Unit *u) _pure_;
 522 bool unit_can_start(Unit *u) _pure_;
 523 bool unit_can_isolate(Unit *u) _pure_;
 524
 525 int unit_start(Unit *u);
 526 int unit_stop(Unit *u);
 527 int unit_reload(Unit *u);
 528
 529 int unit_kill(Unit *u, KillWho w, int signo, sd_bus_error *error);
 530 int unit_kill_common(Unit *u, KillWho who, int signo, pid_t main_pid, pid_t control_pid, sd_bus_error *error);
 531
 532 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success);
 533
 534 int unit_watch_pid(Unit *u, pid_t pid);
 535 void unit_unwatch_pid(Unit *u, pid_t pid);
 536 void unit_unwatch_all_pids(Unit *u);
 537
 538 void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2);
 539
 540 int unit_install_bus_match(Unit *u, sd_bus *bus, const char *name);
 541 int unit_watch_bus_name(Unit *u, const char *name);
 542 void unit_unwatch_bus_name(Unit *u, const char *name);
 543
 544 bool unit_job_is_applicable(Unit *u, JobType j);
 545
 546 int set_unit_path(const char *p);
 547
 548 char *unit_dbus_path(Unit *u);
 549
 550 int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
 551
 552 bool unit_can_serialize(Unit *u) _pure_;
 553
 554 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs);
 555 int unit_deserialize(Unit *u, FILE *f, FDSet *fds);
 556
 557 int unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value);
 558 int unit_serialize_item_escaped(Unit *u, FILE *f, const char *key, const char *value);
 559 int unit_serialize_item_fd(Unit *u, FILE *f, FDSet *fds, const char *key, int fd);
 560 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_(4,5);
 561
 562 int unit_add_node_link(Unit *u, const char *what, bool wants, UnitDependency d);
 563
 564 int unit_coldplug(Unit *u);
 565
 566 void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) _printf_(3, 0);
 567 void unit_status_emit_starting_stopping_reloading(Unit *u, JobType t);
 568
 569 bool unit_need_daemon_reload(Unit *u);
 570
 571 void unit_reset_failed(Unit *u);
 572
 573 Unit *unit_following(Unit *u);
 574 int unit_following_set(Unit *u, Set **s);
 575
 576 const char *unit_slice_name(Unit *u);
 577
 578 bool unit_stop_pending(Unit *u) _pure_;
 579 bool unit_inactive_or_pending(Unit *u) _pure_;
 580 bool unit_active_or_pending(Unit *u);
 581
 582 int unit_add_default_target_dependency(Unit *u, Unit *target);
 583
 584 void unit_start_on_failure(Unit *u);
 585 void unit_trigger_notify(Unit *u);
 586
 587 UnitFileState unit_get_unit_file_state(Unit *u);
 588 int unit_get_unit_file_preset(Unit *u);
 589
 590 Unit* unit_ref_set(UnitRef *ref, Unit *u);
 591 void unit_ref_unset(UnitRef *ref);
 592
 593 #define UNIT_DEREF(ref) ((ref).unit)
 594 #define UNIT_ISSET(ref) (!!(ref).unit)
 595
 596 int unit_patch_contexts(Unit *u);
 597
 598 ExecContext *unit_get_exec_context(Unit *u) _pure_;
 599 KillContext *unit_get_kill_context(Unit *u) _pure_;
 600 CGroupContext *unit_get_cgroup_context(Unit *u) _pure_;
 601
 602 ExecRuntime *unit_get_exec_runtime(Unit *u) _pure_;
 603
 604 int unit_setup_exec_runtime(Unit *u);
 605 int unit_setup_dynamic_creds(Unit *u);
 606
 607 int unit_write_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
 608 int unit_write_drop_in_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) _printf_(4,5);
 609
 610 int unit_write_drop_in_private(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
 611 int unit_write_drop_in_private_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) _printf_(4,5);
 612
 613 int unit_kill_context(Unit *u, KillContext *c, KillOperation k, pid_t main_pid, pid_t control_pid, bool main_pid_alien);
 614
 615 int unit_make_transient(Unit *u);
 616
 617 int unit_require_mounts_for(Unit *u, const char *path);
 618
 619 bool unit_type_supported(UnitType t);
 620
 621 bool unit_is_pristine(Unit *u);
 622
 623 pid_t unit_control_pid(Unit *u);
 624 pid_t unit_main_pid(Unit *u);
 625
 626 static inline bool unit_supported(Unit *u) {
 627         return unit_type_supported(u->type);
 628 }
 629
 630 void unit_warn_if_dir_nonempty(Unit *u, const char* where);
 631 int unit_fail_if_symlink(Unit *u, const char* where);
 632
 633 int unit_start_limit_test(Unit *u);
 634
 635 void unit_unref_uid(Unit *u, bool destroy_now);
 636 int unit_ref_uid(Unit *u, uid_t uid, bool clean_ipc);
 637
 638 void unit_unref_gid(Unit *u, bool destroy_now);
 639 int unit_ref_gid(Unit *u, gid_t gid, bool clean_ipc);
 640
 641 int unit_ref_uid_gid(Unit *u, uid_t uid, gid_t gid);
 642 void unit_unref_uid_gid(Unit *u, bool destroy_now);
 643
 644 void unit_notify_user_lookup(Unit *u, uid_t uid, gid_t gid);
 645
 646 /* Macros which append UNIT= or USER_UNIT= to the message */
 647
 648 #define log_unit_full(unit, level, error, ...)                          \
 649         ({                                                              \
 650                 Unit *_u = (unit);                                      \
 651                 _u ? log_object_internal(level, error, __FILE__, __LINE__, __func__, _u->manager->unit_log_field, _u->id, ##__VA_ARGS__) : \
 652                         log_internal(level, error, __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
 653         })
 654
 655 #define log_unit_debug(unit, ...)   log_unit_full(unit, LOG_DEBUG, 0, ##__VA_ARGS__)
 656 #define log_unit_info(unit, ...)    log_unit_full(unit, LOG_INFO, 0, ##__VA_ARGS__)
 657 #define log_unit_notice(unit, ...)  log_unit_full(unit, LOG_NOTICE, 0, ##__VA_ARGS__)
 658 #define log_unit_warning(unit, ...) log_unit_full(unit, LOG_WARNING, 0, ##__VA_ARGS__)
 659 #define log_unit_error(unit, ...)   log_unit_full(unit, LOG_ERR, 0, ##__VA_ARGS__)
 660
 661 #define log_unit_debug_errno(unit, error, ...)   log_unit_full(unit, LOG_DEBUG, error, ##__VA_ARGS__)
 662 #define log_unit_info_errno(unit, error, ...)    log_unit_full(unit, LOG_INFO, error, ##__VA_ARGS__)
 663 #define log_unit_notice_errno(unit, error, ...)  log_unit_full(unit, LOG_NOTICE, error, ##__VA_ARGS__)
 664 #define log_unit_warning_errno(unit, error, ...) log_unit_full(unit, LOG_WARNING, error, ##__VA_ARGS__)
 665 #define log_unit_error_errno(unit, error, ...)   log_unit_full(unit, LOG_ERR, error, ##__VA_ARGS__)
 666
 667 #define LOG_UNIT_MESSAGE(unit, fmt, ...) "MESSAGE=%s: " fmt, (unit)->id, ##__VA_ARGS__
 668 #define LOG_UNIT_ID(unit) (unit)->manager->unit_log_format_string, (unit)->id