blob: b40ff9b96131d073c70a4dd66cfe59afc55c9006 [file] [log] [blame] [raw]
/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include "bpf-program.h"
#include "condition.h"
#include "emergency-action.h"
#include "install.h"
#include "list.h"
#include "unit-name.h"
#include "cgroup.h"
typedef struct UnitRef UnitRef;
typedef enum KillOperation {
KILL_TERMINATE,
KILL_TERMINATE_AND_LOG,
KILL_KILL,
KILL_ABORT,
_KILL_OPERATION_MAX,
_KILL_OPERATION_INVALID = -1
} KillOperation;
typedef enum CollectMode {
COLLECT_INACTIVE,
COLLECT_INACTIVE_OR_FAILED,
_COLLECT_MODE_MAX,
_COLLECT_MODE_INVALID = -1,
} CollectMode;
static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) {
return IN_SET(t, UNIT_ACTIVE, UNIT_RELOADING);
}
static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t) {
return IN_SET(t, UNIT_ACTIVE, UNIT_ACTIVATING, UNIT_RELOADING);
}
static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t) {
return IN_SET(t, UNIT_INACTIVE, UNIT_FAILED, UNIT_DEACTIVATING);
}
static inline bool UNIT_IS_INACTIVE_OR_FAILED(UnitActiveState t) {
return IN_SET(t, UNIT_INACTIVE, UNIT_FAILED);
}
/* Stores the 'reason' a dependency was created as a bit mask, i.e. due to which configuration source it came to be. We
* use this so that we can selectively flush out parts of dependencies again. Note that the same dependency might be
* created as a result of multiple "reasons", hence the bitmask. */
typedef enum UnitDependencyMask {
/* Configured directly by the unit file, .wants/.requries symlink or drop-in, or as an immediate result of a
* non-dependency option configured that way. */
UNIT_DEPENDENCY_FILE = 1 << 0,
/* As unconditional implicit dependency (not affected by unit configuration — except by the unit name and
* type) */
UNIT_DEPENDENCY_IMPLICIT = 1 << 1,
/* A dependency effected by DefaultDependencies=yes. Note that dependencies marked this way are conceptually
* just a subset of UNIT_DEPENDENCY_FILE, as DefaultDependencies= is itself a unit file setting that can only
* be set in unit files. We make this two separate bits only to help debugging how dependencies came to be. */
UNIT_DEPENDENCY_DEFAULT = 1 << 2,
/* A dependency created from udev rules */
UNIT_DEPENDENCY_UDEV = 1 << 3,
/* A dependency created because of some unit's RequiresMountsFor= setting */
UNIT_DEPENDENCY_PATH = 1 << 4,
/* A dependency created because of data read from /proc/self/mountinfo and no other configuration source */
UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT = 1 << 5,
/* A dependency created because of data read from /proc/self/mountinfo, but conditionalized by
* DefaultDependencies= and thus also involving configuration from UNIT_DEPENDENCY_FILE sources */
UNIT_DEPENDENCY_MOUNTINFO_DEFAULT = 1 << 6,
/* A dependency created because of data read from /proc/swaps and no other configuration source */
UNIT_DEPENDENCY_PROC_SWAP = 1 << 7,
_UNIT_DEPENDENCY_MASK_FULL = (1 << 8) - 1,
} UnitDependencyMask;
/* The Unit's dependencies[] hashmaps use this structure as value. It has the same size as a void pointer, and thus can
* be stored directly as hashmap value, without any indirection. Note that this stores two masks, as both the origin
* and the destination of a dependency might have created it. */
typedef union UnitDependencyInfo {
void *data;
struct {
UnitDependencyMask origin_mask:16;
UnitDependencyMask destination_mask:16;
} _packed_;
} UnitDependencyInfo;
#include "job.h"
struct UnitRef {
/* Keeps tracks of references to a unit. This is useful so
* that we can merge two units if necessary and correct all
* references to them */
Unit *source, *target;
LIST_FIELDS(UnitRef, refs_by_target);
};
typedef enum UnitCGroupBPFState {
UNIT_CGROUP_BPF_OFF = 0,
UNIT_CGROUP_BPF_ON = 1,
UNIT_CGROUP_BPF_INVALIDATED = -1,
} UnitCGroupBPFState;
typedef struct Unit {
Manager *manager;
UnitType type;
UnitLoadState load_state;
Unit *merged_into;
char *id; /* One name is special because we use it for identification. Points to an entry in the names set */
char *instance;
Set *names;
/* For each dependency type we maintain a Hashmap whose key is the Unit* object, and the value encodes why the
* dependency exists, using the UnitDependencyInfo type */
Hashmap *dependencies[_UNIT_DEPENDENCY_MAX];
/* Similar, for RequiresMountsFor= path dependencies. The key is the path, the value the UnitDependencyInfo type */
Hashmap *requires_mounts_for;
char *description;
char **documentation;
char *fragment_path; /* if loaded from a config file this is the primary path to it */
char *source_path; /* if converted, the source file */
char **dropin_paths;
usec_t fragment_mtime;
usec_t source_mtime;
usec_t dropin_mtime;
/* If this is a transient unit we are currently writing, this is where we are writing it to */
FILE *transient_file;
/* If there is something to do with this unit, then this is the installed job for it */
Job *job;
/* JOB_NOP jobs are special and can be installed without disturbing the real job. */
Job *nop_job;
/* The slot used for watching NameOwnerChanged signals */
sd_bus_slot *match_bus_slot;
/* References to this unit from clients */
sd_bus_track *bus_track;
char **deserialized_refs;
/* Job timeout and action to take */
usec_t job_timeout;
usec_t job_running_timeout;
bool job_running_timeout_set:1;
EmergencyAction job_timeout_action;
char *job_timeout_reboot_arg;
/* References to this */
LIST_HEAD(UnitRef, refs_by_target);
/* Conditions to check */
LIST_HEAD(Condition, conditions);
LIST_HEAD(Condition, asserts);
dual_timestamp condition_timestamp;
dual_timestamp assert_timestamp;
/* Updated whenever the low-level state changes */
dual_timestamp state_change_timestamp;
/* Updated whenever the (high-level) active state enters or leaves the active or inactive states */
dual_timestamp inactive_exit_timestamp;
dual_timestamp active_enter_timestamp;
dual_timestamp active_exit_timestamp;
dual_timestamp inactive_enter_timestamp;
UnitRef slice;
/* Per type list */
LIST_FIELDS(Unit, units_by_type);
/* All units which have requires_mounts_for set */
LIST_FIELDS(Unit, has_requires_mounts_for);
/* Load queue */
LIST_FIELDS(Unit, load_queue);
/* D-Bus queue */
LIST_FIELDS(Unit, dbus_queue);
/* Cleanup queue */
LIST_FIELDS(Unit, cleanup_queue);
/* GC queue */
LIST_FIELDS(Unit, gc_queue);
/* CGroup realize members queue */
LIST_FIELDS(Unit, cgroup_realize_queue);
/* cgroup empty queue */
LIST_FIELDS(Unit, cgroup_empty_queue);
/* Target dependencies queue */
LIST_FIELDS(Unit, target_deps_queue);
/* Queue of units with StopWhenUnneeded set that shell be checked for clean-up. */
LIST_FIELDS(Unit, stop_when_unneeded_queue);
/* PIDs we keep an eye on. Note that a unit might have many
* more, but these are the ones we care enough about to
* process SIGCHLD for */
Set *pids;
/* Used in SIGCHLD and sd_notify() message event invocation logic to avoid that we dispatch the same event
* multiple times on the same unit. */
unsigned sigchldgen;
unsigned notifygen;
/* Used during GC sweeps */
unsigned gc_marker;
/* Error code when we didn't manage to load the unit (negative) */
int load_error;
/* Put a ratelimit on unit starting */
RateLimit start_limit;
EmergencyAction start_limit_action;
EmergencyAction failure_action;
EmergencyAction success_action;
char *reboot_arg;
/* Make sure we never enter endless loops with the check unneeded logic, or the BindsTo= logic */
RateLimit auto_stop_ratelimit;
/* Reference to a specific UID/GID */
uid_t ref_uid;
gid_t ref_gid;
/* Cached unit file state and preset */
UnitFileState unit_file_state;
int unit_file_preset;
/* Where the cpu.stat or cpuacct.usage was at the time the unit was started */
nsec_t cpu_usage_base;
nsec_t cpu_usage_last; /* the most recently read value */
/* Counterparts in the cgroup filesystem */
char *cgroup_path;
CGroupMask cgroup_realized_mask;
CGroupMask cgroup_enabled_mask;
CGroupMask cgroup_subtree_mask;
CGroupMask cgroup_members_mask;
int cgroup_inotify_wd;
/* IP BPF Firewalling/accounting */
int ip_accounting_ingress_map_fd;
int ip_accounting_egress_map_fd;
int ipv4_allow_map_fd;
int ipv6_allow_map_fd;
int ipv4_deny_map_fd;
int ipv6_deny_map_fd;
BPFProgram *ip_bpf_ingress, *ip_bpf_ingress_installed;
BPFProgram *ip_bpf_egress, *ip_bpf_egress_installed;
uint64_t ip_accounting_extra[_CGROUP_IP_ACCOUNTING_METRIC_MAX];
/* Low-priority event source which is used to remove watched PIDs that have gone away, and subscribe to any new
* ones which might have appeared. */
sd_event_source *rewatch_pids_event_source;
/* How to start OnFailure units */
JobMode on_failure_job_mode;
/* Tweaking the GC logic */
CollectMode collect_mode;
/* The current invocation ID */
sd_id128_t invocation_id;
char invocation_id_string[SD_ID128_STRING_MAX]; /* useful when logging */
/* Garbage collect us we nobody wants or requires us anymore */
bool stop_when_unneeded;
/* Create default dependencies */
bool default_dependencies;
/* Refuse manual starting, allow starting only indirectly via dependency. */
bool refuse_manual_start;
/* Don't allow the user to stop this unit manually, allow stopping only indirectly via dependency. */
bool refuse_manual_stop;
/* Allow isolation requests */
bool allow_isolate;
/* Ignore this unit when isolating */
bool ignore_on_isolate;
/* Did the last condition check succeed? */
bool condition_result;
bool assert_result;
/* Is this a transient unit? */
bool transient;
/* Is this a unit that is always running and cannot be stopped? */
bool perpetual;
bool in_load_queue:1;
bool in_dbus_queue:1;
bool in_cleanup_queue:1;
bool in_gc_queue:1;
bool in_cgroup_realize_queue:1;
bool in_cgroup_empty_queue:1;
bool in_target_deps_queue:1;
bool in_stop_when_unneeded_queue:1;
bool sent_dbus_new_signal:1;
bool in_audit:1;
bool on_console:1;
bool cgroup_realized:1;
bool cgroup_members_mask_valid:1;
bool cgroup_subtree_mask_valid:1;
UnitCGroupBPFState cgroup_bpf_state:2;
/* Reset cgroup accounting next time we fork something off */
bool reset_accounting:1;
bool start_limit_hit:1;
/* Did we already invoke unit_coldplug() for this unit? */
bool coldplugged:1;
/* For transient units: whether to add a bus track reference after creating the unit */
bool bus_track_add:1;
/* Remember which unit state files we created */
bool exported_invocation_id:1;
bool exported_log_level_max:1;
bool exported_log_extra_fields:1;
bool exported_log_rate_limit_interval:1;
bool exported_log_rate_limit_burst:1;
/* Whether we warned about clamping the CPU quota period */
bool warned_clamping_cpu_quota_period:1;
/* When writing transient unit files, stores which section we stored last. If < 0, we didn't write any yet. If
* == 0 we are in the [Unit] section, if > 0 we are in the unit type-specific section. */
int last_section_private:2;
} Unit;
typedef struct UnitStatusMessageFormats {
const char *starting_stopping[2];
const char *finished_start_job[_JOB_RESULT_MAX];
const char *finished_stop_job[_JOB_RESULT_MAX];
} UnitStatusMessageFormats;
/* Flags used when writing drop-in files or transient unit files */
typedef enum UnitWriteFlags {
/* Write a runtime unit file or drop-in (i.e. one below /run) */
UNIT_RUNTIME = 1 << 0,
/* Write a persistent drop-in (i.e. one below /etc) */
UNIT_PERSISTENT = 1 << 1,
/* Place this item in the per-unit-type private section, instead of [Unit] */
UNIT_PRIVATE = 1 << 2,
/* Apply specifier escaping before writing */
UNIT_ESCAPE_SPECIFIERS = 1 << 3,
/* Apply C escaping before writing */
UNIT_ESCAPE_C = 1 << 4,
} UnitWriteFlags;
/* Returns true if neither persistent, nor runtime storage is requested, i.e. this is a check invocation only */
#define UNIT_WRITE_FLAGS_NOOP(flags) (((flags) & (UNIT_RUNTIME|UNIT_PERSISTENT)) == 0)
#include "kill.h"
typedef struct UnitVTable {
/* How much memory does an object of this unit type need */
size_t object_size;
/* If greater than 0, the offset into the object where
* ExecContext is found, if the unit type has that */
size_t exec_context_offset;
/* If greater than 0, the offset into the object where
* CGroupContext is found, if the unit type has that */
size_t cgroup_context_offset;
/* If greater than 0, the offset into the object where
* KillContext is found, if the unit type has that */
size_t kill_context_offset;
/* If greater than 0, the offset into the object where the
* pointer to ExecRuntime is found, if the unit type has
* that */
size_t exec_runtime_offset;
/* If greater than 0, the offset into the object where the pointer to DynamicCreds is found, if the unit type
* has that. */
size_t dynamic_creds_offset;
/* The name of the configuration file section with the private settings of this unit */
const char *private_section;
/* Config file sections this unit type understands, separated
* by NUL chars */
const char *sections;
/* This should reset all type-specific variables. This should
* not allocate memory, and is called with zero-initialized
* data. It should hence only initialize variables that need
* to be set != 0. */
void (*init)(Unit *u);
/* This should free all type-specific variables. It should be
* idempotent. */
void (*done)(Unit *u);
/* Actually load data from disk. This may fail, and should set
* load_state to UNIT_LOADED, UNIT_MERGED or leave it at
* UNIT_STUB if no configuration could be found. */
int (*load)(Unit *u);
/* During deserialization we only record the intended state to return to. With coldplug() we actually put the
* deserialized state in effect. This is where unit_notify() should be called to start things up. */
int (*coldplug)(Unit *u);
/* This is called shortly after all units' coldplug() call was invoked. It's supposed to catch up state changes
* we missed so far (for example because they took place while we were reloading/reexecing) */
void (*catchup)(Unit *u);
void (*dump)(Unit *u, FILE *f, const char *prefix);
int (*start)(Unit *u);
int (*stop)(Unit *u);
int (*reload)(Unit *u);
int (*kill)(Unit *u, KillWho w, int signo, sd_bus_error *error);
bool (*can_reload)(Unit *u);
/* Write all data that cannot be restored from other sources
* away using unit_serialize_item() */
int (*serialize)(Unit *u, FILE *f, FDSet *fds);
/* Restore one item from the serialization */
int (*deserialize_item)(Unit *u, const char *key, const char *data, FDSet *fds);
/* Try to match up fds with what we need for this unit */
void (*distribute_fds)(Unit *u, FDSet *fds);
/* Boils down the more complex internal state of this unit to
* a simpler one that the engine can understand */
UnitActiveState (*active_state)(Unit *u);
/* Returns the substate specific to this unit type as
* string. This is purely information so that we can give the
* user a more fine grained explanation in which actual state a
* unit is in. */
const char* (*sub_state_to_string)(Unit *u);
/* Additionally to UnitActiveState determine whether unit is to be restarted. */
bool (*will_restart)(Unit *u);
/* Return false when there is a reason to prevent this unit from being gc'ed
* even though nothing references it and it isn't active in any way. */
bool (*may_gc)(Unit *u);
/* When the unit is not running and no job for it queued we shall release its runtime resources */
void (*release_resources)(Unit *u);
/* Invoked on every child that died */
void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
/* Reset failed state if we are in failed state */
void (*reset_failed)(Unit *u);
/* Called whenever any of the cgroups this unit watches for
* ran empty */
void (*notify_cgroup_empty)(Unit *u);
/* Called whenever a process of this unit sends us a message */
void (*notify_message)(Unit *u, const struct ucred *ucred, char **tags, FDSet *fds);
/* Called whenever a name this Unit registered for comes or goes away. */
void (*bus_name_owner_change)(Unit *u, const char *name, const char *old_owner, const char *new_owner);
/* Called for each property that is being set */
int (*bus_set_property)(Unit *u, const char *name, sd_bus_message *message, UnitWriteFlags flags, sd_bus_error *error);
/* Called after at least one property got changed to apply the necessary change */
int (*bus_commit_properties)(Unit *u);
/* Return the unit this unit is following */
Unit *(*following)(Unit *u);
/* Return the set of units that are following each other */
int (*following_set)(Unit *u, Set **s);
/* Invoked each time a unit this unit is triggering changes
* state or gains/loses a job */
void (*trigger_notify)(Unit *u, Unit *trigger);
/* Called whenever CLOCK_REALTIME made a jump */
void (*time_change)(Unit *u);
/* Called whenever /etc/localtime was modified */
void (*timezone_change)(Unit *u);
/* Returns the next timeout of a unit */
int (*get_timeout)(Unit *u, usec_t *timeout);
/* Returns the main PID if there is any defined, or 0. */
pid_t (*main_pid)(Unit *u);
/* Returns the main PID if there is any defined, or 0. */
pid_t (*control_pid)(Unit *u);
/* Returns true if the unit currently needs access to the console */
bool (*needs_console)(Unit *u);
/* Like the enumerate() callback further down, but only enumerates the perpetual units, i.e. all units that
* unconditionally exist and are always active. The main reason to keep both enumeration functions separate is
* philosophical: the state of perpetual units should be put in place by coldplug(), while the state of those
* discovered through regular enumeration should be put in place by catchup(), see below. */
void (*enumerate_perpetual)(Manager *m);
/* This is called for each unit type and should be used to enumerate units already existing in the system
* internally and load them. However, everything that is loaded here should still stay in inactive state. It is
* the job of the catchup() call above to put the units into the discovered state. */
void (*enumerate)(Manager *m);
/* Type specific cleanups. */
void (*shutdown)(Manager *m);
/* If this function is set and return false all jobs for units
* of this type will immediately fail. */
bool (*supported)(void);
/* The bus vtable */
const sd_bus_vtable *bus_vtable;
/* The strings to print in status messages */
UnitStatusMessageFormats status_message_formats;
/* True if transient units of this type are OK */
bool can_transient:1;
/* True if cgroup delegation is permissible */
bool can_delegate:1;
/* True if units of this type shall be startable only once and then never again */
bool once_only:1;
/* True if queued jobs of this type should be GC'ed if no other job needs them anymore */
bool gc_jobs:1;
} UnitVTable;
extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX];
#define UNIT_VTABLE(u) unit_vtable[(u)->type]
/* For casting a unit into the various unit types */
#define DEFINE_CAST(UPPERCASE, MixedCase) \
static inline MixedCase* UPPERCASE(Unit *u) { \
if (_unlikely_(!u || u->type != UNIT_##UPPERCASE)) \
return NULL; \
\
return (MixedCase*) u; \
}
/* For casting the various unit types into a unit */
#define UNIT(u) (&(u)->meta)
#define UNIT_HAS_EXEC_CONTEXT(u) (UNIT_VTABLE(u)->exec_context_offset > 0)
#define UNIT_HAS_CGROUP_CONTEXT(u) (UNIT_VTABLE(u)->cgroup_context_offset > 0)
#define UNIT_HAS_KILL_CONTEXT(u) (UNIT_VTABLE(u)->kill_context_offset > 0)
#define UNIT_TRIGGER(u) ((Unit*) hashmap_first_key((u)->dependencies[UNIT_TRIGGERS]))
Unit *unit_new(Manager *m, size_t size);
void unit_free(Unit *u);
DEFINE_TRIVIAL_CLEANUP_FUNC(Unit *, unit_free);
int unit_new_for_name(Manager *m, size_t size, const char *name, Unit **ret);
int unit_add_name(Unit *u, const char *name);
int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference, UnitDependencyMask mask);
int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference, UnitDependencyMask mask);
int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference, UnitDependencyMask mask);
int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference, UnitDependencyMask mask);
int unit_add_exec_dependencies(Unit *u, ExecContext *c);
int unit_choose_id(Unit *u, const char *name);
int unit_set_description(Unit *u, const char *description);
bool unit_may_gc(Unit *u);
void unit_add_to_load_queue(Unit *u);
void unit_add_to_dbus_queue(Unit *u);
void unit_add_to_cleanup_queue(Unit *u);
void unit_add_to_gc_queue(Unit *u);
void unit_add_to_target_deps_queue(Unit *u);
void unit_add_to_stop_when_unneeded_queue(Unit *u);
int unit_merge(Unit *u, Unit *other);
int unit_merge_by_name(Unit *u, const char *other);
Unit *unit_follow_merge(Unit *u) _pure_;
int unit_load_fragment_and_dropin(Unit *u);
int unit_load_fragment_and_dropin_optional(Unit *u);
int unit_load(Unit *unit);
int unit_set_slice(Unit *u, Unit *slice);
int unit_set_default_slice(Unit *u);
const char *unit_description(Unit *u) _pure_;
bool unit_has_name(Unit *u, const char *name);
UnitActiveState unit_active_state(Unit *u);
const char* unit_sub_state_to_string(Unit *u);
void unit_dump(Unit *u, FILE *f, const char *prefix);
bool unit_can_reload(Unit *u) _pure_;
bool unit_can_start(Unit *u) _pure_;
bool unit_can_stop(Unit *u) _pure_;
bool unit_can_isolate(Unit *u) _pure_;
int unit_start(Unit *u);
int unit_stop(Unit *u);
int unit_reload(Unit *u);
int unit_kill(Unit *u, KillWho w, int signo, sd_bus_error *error);
int unit_kill_common(Unit *u, KillWho who, int signo, pid_t main_pid, pid_t control_pid, sd_bus_error *error);
typedef enum UnitNotifyFlags {
UNIT_NOTIFY_RELOAD_FAILURE = 1 << 0,
UNIT_NOTIFY_WILL_AUTO_RESTART = 1 << 1,
UNIT_NOTIFY_SKIP_CONDITION = 1 << 2,
} UnitNotifyFlags;
void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, UnitNotifyFlags flags);
int unit_watch_pid(Unit *u, pid_t pid, bool exclusive);
void unit_unwatch_pid(Unit *u, pid_t pid);
void unit_unwatch_all_pids(Unit *u);
int unit_enqueue_rewatch_pids(Unit *u);
void unit_dequeue_rewatch_pids(Unit *u);
int unit_install_bus_match(Unit *u, sd_bus *bus, const char *name);
int unit_watch_bus_name(Unit *u, const char *name);
void unit_unwatch_bus_name(Unit *u, const char *name);
bool unit_job_is_applicable(Unit *u, JobType j);
int set_unit_path(const char *p);
char *unit_dbus_path(Unit *u);
char *unit_dbus_path_invocation_id(Unit *u);
int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
bool unit_can_serialize(Unit *u) _pure_;
int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs);
int unit_deserialize(Unit *u, FILE *f, FDSet *fds);
int unit_deserialize_skip(FILE *f);
int unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value);
int unit_serialize_item_escaped(Unit *u, FILE *f, const char *key, const char *value);
int unit_serialize_item_fd(Unit *u, FILE *f, FDSet *fds, const char *key, int fd);
void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_(4,5);
int unit_add_node_dependency(Unit *u, const char *what, bool wants, UnitDependency d, UnitDependencyMask mask);
int unit_coldplug(Unit *u);
void unit_catchup(Unit *u);
void unit_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) _printf_(3, 0);
bool unit_need_daemon_reload(Unit *u);
void unit_reset_failed(Unit *u);
Unit *unit_following(Unit *u);
int unit_following_set(Unit *u, Set **s);
const char *unit_slice_name(Unit *u);
bool unit_stop_pending(Unit *u) _pure_;
bool unit_inactive_or_pending(Unit *u) _pure_;
bool unit_active_or_pending(Unit *u);
bool unit_will_restart(Unit *u);
int unit_add_default_target_dependency(Unit *u, Unit *target);
void unit_start_on_failure(Unit *u);
void unit_trigger_notify(Unit *u);
UnitFileState unit_get_unit_file_state(Unit *u);
int unit_get_unit_file_preset(Unit *u);
Unit* unit_ref_set(UnitRef *ref, Unit *source, Unit *target);
void unit_ref_unset(UnitRef *ref);
#define UNIT_DEREF(ref) ((ref).target)
#define UNIT_ISSET(ref) (!!(ref).target)
int unit_patch_contexts(Unit *u);
ExecContext *unit_get_exec_context(Unit *u) _pure_;
KillContext *unit_get_kill_context(Unit *u) _pure_;
CGroupContext *unit_get_cgroup_context(Unit *u) _pure_;
ExecRuntime *unit_get_exec_runtime(Unit *u) _pure_;
int unit_setup_exec_runtime(Unit *u);
int unit_setup_dynamic_creds(Unit *u);
char* unit_escape_setting(const char *s, UnitWriteFlags flags, char **buf);
char* unit_concat_strv(char **l, UnitWriteFlags flags);
int unit_write_setting(Unit *u, UnitWriteFlags flags, const char *name, const char *data);
int unit_write_settingf(Unit *u, UnitWriteFlags mode, const char *name, const char *format, ...) _printf_(4,5);
int unit_kill_context(Unit *u, KillContext *c, KillOperation k, pid_t main_pid, pid_t control_pid, bool main_pid_alien);
int unit_make_transient(Unit *u);
int unit_require_mounts_for(Unit *u, const char *path, UnitDependencyMask mask);
bool unit_type_supported(UnitType t);
bool unit_is_pristine(Unit *u);
bool unit_is_unneeded(Unit *u);
pid_t unit_control_pid(Unit *u);
pid_t unit_main_pid(Unit *u);
static inline bool unit_supported(Unit *u) {
return unit_type_supported(u->type);
}
void unit_warn_if_dir_nonempty(Unit *u, const char* where);
int unit_fail_if_noncanonical(Unit *u, const char* where);
int unit_start_limit_test(Unit *u);
void unit_unref_uid(Unit *u, bool destroy_now);
int unit_ref_uid(Unit *u, uid_t uid, bool clean_ipc);
void unit_unref_gid(Unit *u, bool destroy_now);
int unit_ref_gid(Unit *u, gid_t gid, bool clean_ipc);
int unit_ref_uid_gid(Unit *u, uid_t uid, gid_t gid);
void unit_unref_uid_gid(Unit *u, bool destroy_now);
void unit_notify_user_lookup(Unit *u, uid_t uid, gid_t gid);
int unit_set_invocation_id(Unit *u, sd_id128_t id);
int unit_acquire_invocation_id(Unit *u);
bool unit_shall_confirm_spawn(Unit *u);
void unit_set_exec_params(Unit *s, ExecParameters *p);
int unit_fork_helper_process(Unit *u, const char *name, pid_t *ret);
void unit_remove_dependencies(Unit *u, UnitDependencyMask mask);
void unit_export_state_files(Unit *u);
void unit_unlink_state_files(Unit *u);
int unit_prepare_exec(Unit *u);
void unit_warn_leftover_processes(Unit *u);
bool unit_needs_console(Unit *u);
const char *unit_label_path(Unit *u);
int unit_pid_attachable(Unit *unit, pid_t pid, sd_bus_error *error);
void unit_log_success(Unit *u);
void unit_log_failure(Unit *u, const char *result);
/* unit_log_skip is for cases like ExecCondition= where a unit is considered "done"
* after some execution, rather than succeeded or failed. */
void unit_log_skip(Unit *u, const char *result);
/* Macros which append UNIT= or USER_UNIT= to the message */
#define log_unit_full(unit, level, error, ...) \
({ \
const Unit *_u = (unit); \
_u ? log_object_internal(level, error, __FILE__, __LINE__, __func__, _u->manager->unit_log_field, _u->id, _u->manager->invocation_log_field, _u->invocation_id_string, ##__VA_ARGS__) : \
log_internal(level, error, __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
})
#define log_unit_debug(unit, ...) log_unit_full(unit, LOG_DEBUG, 0, ##__VA_ARGS__)
#define log_unit_info(unit, ...) log_unit_full(unit, LOG_INFO, 0, ##__VA_ARGS__)
#define log_unit_notice(unit, ...) log_unit_full(unit, LOG_NOTICE, 0, ##__VA_ARGS__)
#define log_unit_warning(unit, ...) log_unit_full(unit, LOG_WARNING, 0, ##__VA_ARGS__)
#define log_unit_error(unit, ...) log_unit_full(unit, LOG_ERR, 0, ##__VA_ARGS__)
#define log_unit_debug_errno(unit, error, ...) log_unit_full(unit, LOG_DEBUG, error, ##__VA_ARGS__)
#define log_unit_info_errno(unit, error, ...) log_unit_full(unit, LOG_INFO, error, ##__VA_ARGS__)
#define log_unit_notice_errno(unit, error, ...) log_unit_full(unit, LOG_NOTICE, error, ##__VA_ARGS__)
#define log_unit_warning_errno(unit, error, ...) log_unit_full(unit, LOG_WARNING, error, ##__VA_ARGS__)
#define log_unit_error_errno(unit, error, ...) log_unit_full(unit, LOG_ERR, error, ##__VA_ARGS__)
#define LOG_UNIT_MESSAGE(unit, fmt, ...) "MESSAGE=%s: " fmt, (unit)->id, ##__VA_ARGS__
#define LOG_UNIT_ID(unit) (unit)->manager->unit_log_format_string, (unit)->id
#define LOG_UNIT_INVOCATION_ID(unit) (unit)->manager->invocation_log_format_string, (unit)->invocation_id_string
const char* collect_mode_to_string(CollectMode m) _const_;
CollectMode collect_mode_from_string(const char *s) _pure_;