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Systemd/src/core/unit.h
Lennart Poettering d3070fbdf6 core: implement /run/systemd/units/-based path for passing unit info from PID 1 to journald 
And let's make use of it to implement two new unit settings with it:

1. LogLevelMax= is a new per-unit setting that may be used to configure
   log priority filtering: set it to LogLevelMax=notice and only
   messages of level "notice" and lower (i.e. more important) will be
   processed, all others are dropped.

2. LogExtraFields= is a new per-unit setting for configuring per-unit
   journal fields, that are implicitly included in every log record
   generated by the unit's processes. It takes field/value pairs in the
   form of FOO=BAR.

Also, related to this, one exisiting unit setting is ported to this new
facility:

3. The invocation ID is now pulled from /run/systemd/units/ instead of
   cgroupfs xattrs. This substantially relaxes requirements of systemd
   on the kernel version and the privileges it runs with (specifically,
   cgroupfs xattrs are not available in containers, since they are
   stored in kernel memory, and hence are unsafe to permit to lesser
   privileged code).

/run/systemd/units/ is a new directory, which contains a number of files
and symlinks encoding the above information. PID 1 creates and manages
these files, and journald reads them from there.

Note that this is supposed to be a direct path between PID 1 and the
journal only, due to the special runtime environment the journal runs
in. Normally, today we shouldn't introduce new interfaces that (mis-)use
a file system as IPC framework, and instead just an IPC system, but this
is very hard to do between the journal and PID 1, as long as the IPC
system is a subject PID 1 manages, and itself a client to the journal.

This patch cleans up a couple of types used in journal code:
specifically we switch to size_t for a couple of memory-sizing values,
as size_t is the right choice for everything that is memory.

Fixes: #4089
Fixes: #3041
Fixes: #4441
2017-11-16 12:40:17 +01:00

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#pragma once
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
typedef struct Unit Unit;
typedef struct UnitVTable UnitVTable;
typedef struct UnitRef UnitRef;
typedef struct UnitStatusMessageFormats UnitStatusMessageFormats;
#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 enum KillOperation {
KILL_TERMINATE,
KILL_TERMINATE_AND_LOG,
KILL_KILL,
KILL_ABORT,
_KILL_OPERATION_MAX,
_KILL_OPERATION_INVALID = -1
} KillOperation;
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* unit;
LIST_FIELDS(UnitRef, refs);
};
typedef enum UnitCGroupBPFState {
UNIT_CGROUP_BPF_OFF = 0,
UNIT_CGROUP_BPF_ON = 1,
UNIT_CGROUP_BPF_INVALIDATED = -1,
} UnitCGroupBPFState;
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);
/* 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);
/* 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 event invocation to avoid repeat events being invoked */
uint64_t sigchldgen;
/* 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;
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;
BPFProgram *ip_bpf_egress;
uint64_t ip_accounting_extra[_CGROUP_IP_ACCOUNTING_METRIC_MAX];
/* How to start OnFailure units */
JobMode on_failure_job_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 sent_dbus_new_signal:1;
bool in_audit:1;
bool cgroup_realized:1;
bool cgroup_members_mask_valid:1;
bool cgroup_subtree_mask_valid:1;
UnitCGroupBPFState cgroup_bpf_state:2;
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;
};
struct UnitStatusMessageFormats {
const char *starting_stopping[2];
const char *finished_start_job[_JOB_RESULT_MAX];
const char *finished_stop_job[_JOB_RESULT_MAX];
};
typedef enum UnitSetPropertiesMode {
UNIT_CHECK = 0,
UNIT_RUNTIME = 1,
UNIT_PERSISTENT = 2,
} UnitSetPropertiesMode;
#include "automount.h"
#include "device.h"
#include "path.h"
#include "scope.h"
#include "slice.h"
#include "socket.h"
#include "swap.h"
#include "target.h"
#include "timer.h"
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);
/* If a lot of units got created via enumerate(), this is
* where to actually set the state and call unit_notify(). */
int (*coldplug)(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);
/* Return true when there is reason to keep this entry around
* even nothing references it and it isn't active in any
* way */
bool (*check_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, bool inactive);
/* 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, pid_t pid, 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, UnitSetPropertiesMode mode, 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);
/* 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);
/* This is called for each unit type and should be used to
* enumerate existing devices and load them. However,
* everything that is loaded here should still stay in
* inactive state. It is the job of the coldplug() call above
* to put the units into the initial 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 queued jobs of this type should be GC'ed if no other job needs them anymore */
bool gc_jobs:1;
};
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]))
DEFINE_CAST(SERVICE, Service);
DEFINE_CAST(SOCKET, Socket);
DEFINE_CAST(TARGET, Target);
DEFINE_CAST(DEVICE, Device);
DEFINE_CAST(MOUNT, Mount);
DEFINE_CAST(AUTOMOUNT, Automount);
DEFINE_CAST(SWAP, Swap);
DEFINE_CAST(TIMER, Timer);
DEFINE_CAST(PATH, Path);
DEFINE_CAST(SLICE, Slice);
DEFINE_CAST(SCOPE, Scope);
Unit *unit_new(Manager *m, size_t size);
void unit_free(Unit *u);
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_check_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);
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);
void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success);
int unit_watch_pid(Unit *u, pid_t pid);
void unit_unwatch_pid(Unit *u, pid_t pid);
void unit_unwatch_all_pids(Unit *u);
void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2);
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);
void 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_status_printf(Unit *u, const char *status, const char *unit_status_msg_format) _printf_(3, 0);
void unit_status_emit_starting_stopping_reloading(Unit *u, JobType t);
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);
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 *u);
void unit_ref_unset(UnitRef *ref);
#define UNIT_DEREF(ref) ((ref).unit)
#define UNIT_ISSET(ref) (!!(ref).unit)
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);
int unit_write_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
int unit_write_drop_in_format(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *format, ...) _printf_(4,5);
int unit_write_drop_in_private(Unit *u, UnitSetPropertiesMode mode, const char *name, const char *data);
int unit_write_drop_in_private_format(Unit *u, UnitSetPropertiesMode 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);
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_symlink(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, 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);
/* 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
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