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Diffstat (limited to 'src/core/unit.h')
| -rw-r--r-- | src/core/unit.h | 944 |
1 files changed, 944 insertions, 0 deletions
diff --git a/src/core/unit.h b/src/core/unit.h new file mode 100644 index 0000000..02b2b24 --- /dev/null +++ b/src/core/unit.h @@ -0,0 +1,944 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <stdbool.h> +#include <stdlib.h> +#include <unistd.h> + +#include "bpf-program.h" +#include "condition.h" +#include "emergency-action.h" +#include "list.h" +#include "show-status.h" +#include "set.h" +#include "unit-file.h" +#include "cgroup.h" + +typedef struct UnitRef UnitRef; + +typedef enum KillOperation { + KILL_TERMINATE, + KILL_TERMINATE_AND_LOG, + KILL_RESTART, + KILL_KILL, + KILL_WATCHDOG, + _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); +} + +static inline bool UNIT_IS_LOAD_COMPLETE(UnitLoadState t) { + return t >= 0 && t < _UNIT_LOAD_STATE_MAX && t != UNIT_STUB && t != UNIT_MERGED; +} + +/* 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/.requires 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 struct Unit { + Manager *manager; + + UnitType type; + UnitLoadState load_state; + Unit *merged_into; + + FreezerState freezer_state; + sd_bus_message *pending_freezer_message; + + char *id; /* The one special name that we use for identification */ + char *instance; + + Set *aliases; /* All the other 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_not_found_timestamp_hash; + 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; + sd_bus_slot *get_name_owner_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); + + /* 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); + + /* cgroup OOM queue */ + LIST_FIELDS(Unit, cgroup_oom_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_ratelimit; + EmergencyAction start_limit_action; + + /* What to do on failure or success */ + EmergencyAction success_action, failure_action; + int success_action_exit_status, failure_action_exit_status; + 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 */ + + /* The current counter of processes sent SIGKILL by systemd-oomd */ + uint64_t managed_oom_kill_last; + + /* The current counter of the oom_kill field in the memory.events cgroup attribute */ + uint64_t oom_kill_last; + + /* Where the io.stat data was at the time the unit was started */ + uint64_t io_accounting_base[_CGROUP_IO_ACCOUNTING_METRIC_MAX]; + uint64_t io_accounting_last[_CGROUP_IO_ACCOUNTING_METRIC_MAX]; /* the most recently read value */ + + /* Counterparts in the cgroup filesystem */ + char *cgroup_path; + CGroupMask cgroup_realized_mask; /* In which hierarchies does this unit's cgroup exist? (only relevant on cgroup v1) */ + CGroupMask cgroup_enabled_mask; /* Which controllers are enabled (or more correctly: enabled for the children) for this unit's cgroup? (only relevant on cgroup v2) */ + CGroupMask cgroup_invalidated_mask; /* A mask specifying controllers which shall be considered invalidated, and require re-realization */ + CGroupMask cgroup_members_mask; /* A cache for the controllers required by all children of this cgroup (only relevant for slice units) */ + + /* Inotify watch descriptors for watching cgroup.events and memory.events on cgroupv2 */ + int cgroup_control_inotify_wd; + int cgroup_memory_inotify_wd; + + /* Device Controller BPF program */ + BPFProgram *bpf_device_control_installed; + + /* 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; + Set *ip_bpf_custom_ingress; + Set *ip_bpf_custom_ingress_installed; + Set *ip_bpf_custom_egress; + Set *ip_bpf_custom_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; + + /* Booleans indicating membership of this unit in the various queues */ + 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_cgroup_oom_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; + + /* 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_ratelimit_interval:1; + bool exported_log_ratelimit_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. */ + signed 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]; + /* If this entry is present, it'll be called to provide a context-dependent format string, + * or NULL to fall back to finished_{start,stop}_job; if those are NULL too, fall back to generic. */ + const char *(*finished_job)(Unit *u, JobType t, JobResult result); +} 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 */ +static inline bool UNIT_WRITE_FLAGS_NOOP(UnitWriteFlags flags) { + return (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. Note that + * this callback is invoked *before* we leave the reloading state of the manager, i.e. *before* we consider the + * reloading to be complete. Thus, this callback should just restore the exact same state for any unit that was + * in effect before the reload, i.e. units should not catch up with changes happened during the reload. That's + * what catchup() below is for. */ + int (*coldplug)(Unit *u); + + /* This is called shortly after all units' coldplug() call was invoked, and *after* the manager left the + * reloading state. It's supposed to catch up with state changes due to external events 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); + + /* Clear out the various runtime/state/cache/logs/configuration data */ + int (*clean)(Unit *u, ExecCleanMask m); + + /* Freeze the unit */ + int (*freeze)(Unit *u); + int (*thaw)(Unit *u); + bool (*can_freeze)(Unit *u); + + /* Return which kind of data can be cleaned */ + int (*can_clean)(Unit *u, ExecCleanMask *ret); + + 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); + + /* Return true when the unit is not controlled by the manager (e.g. extrinsic mounts). */ + bool (*is_extrinsic)(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 an OOM kill event on this unit was seen */ + void (*notify_cgroup_oom)(Unit *u); + + /* Called whenever a process of this unit sends us a message */ + void (*notify_message)(Unit *u, const struct ucred *ucred, char * const *tags, FDSet *fds); + + /* Called whenever a name this Unit registered for comes or goes away. */ + void (*bus_name_owner_change)(Unit *u, 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); + + /* Returns the exit status to propagate in case of FailureAction=exit/SuccessAction=exit; usually returns the + * exit code of the "main" process of the service or similar. */ + int (*exit_status)(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 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 the unit type triggers other units, i.e. can have a UNIT_TRIGGERS dependency */ + bool can_trigger:1; + + /* True if the unit type knows a failure state, and thus can be source of an OnFailure= dependency */ + bool can_fail: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; + + /* True if systemd-oomd can monitor and act on this unit's recursive children's cgroup(s) */ + bool can_set_managed_oom:1; +} UnitVTable; + +extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX]; + +static inline const UnitVTable* UNIT_VTABLE(Unit *u) { + return 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) \ + ({ \ + typeof(u) _u_ = (u); \ + Unit *_w_ = _u_ ? &(_u_)->meta : NULL; \ + _w_; \ + }) + +#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) + +static inline Unit* UNIT_TRIGGER(Unit *u) { + return 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, bool add_reference, UnitDependencyMask mask); +int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, 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); + +static inline bool unit_is_extrinsic(Unit *u) { + return u->perpetual || + (UNIT_VTABLE(u)->is_extrinsic && UNIT_VTABLE(u)->is_extrinsic(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_submit_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, bool fragment_required); +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_; +const char *unit_status_string(Unit *u) _pure_; + +bool unit_has_name(const Unit *u, const char *name); + +UnitActiveState unit_active_state(Unit *u); +FreezerState unit_freezer_state(Unit *u); +int unit_freezer_state_kernel(Unit *u, FreezerState *ret); + +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_add_node_dependency(Unit *u, const char *what, UnitDependency d, UnitDependencyMask mask); +int unit_add_blockdev_dependency(Unit *u, const char *what, UnitDependencyMask mask); + +int unit_coldplug(Unit *u); +void unit_catchup(Unit *u); + +void unit_status_printf(Unit *u, StatusType status_type, const char *status, const char *unit_status_msg_format) _printf_(4, 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_default(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); + +void unit_warn_if_dir_nonempty(Unit *u, const char* where); +int unit_fail_if_noncanonical(Unit *u, const char* where); + +int unit_test_start_limit(Unit *u); + +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_acquire_invocation_id(Unit *u); + +bool unit_shall_confirm_spawn(Unit *u); + +int unit_set_exec_params(Unit *s, ExecParameters *p); + +int unit_fork_helper_process(Unit *u, const char *name, pid_t *ret); +int unit_fork_and_watch_rm_rf(Unit *u, char **paths, pid_t *ret_pid); + +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); + +int unit_log_leftover_process_start(pid_t pid, int sig, void *userdata); +int unit_log_leftover_process_stop(pid_t pid, int sig, void *userdata); +int unit_warn_leftover_processes(Unit *u, cg_kill_log_func_t log_func); + +bool unit_needs_console(Unit *u); + +const char *unit_label_path(const Unit *u); + +int unit_pid_attachable(Unit *unit, pid_t pid, sd_bus_error *error); + +static inline bool unit_has_job_type(Unit *u, JobType type) { + return u && u->job && u->job->type == type; +} + +/* 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); +void unit_log_success(Unit *u); +void unit_log_failure(Unit *u, const char *result); +static inline void unit_log_result(Unit *u, bool success, const char *result) { + if (success) + unit_log_success(u); + else + unit_log_failure(u, result); +} + +void unit_log_process_exit(Unit *u, const char *kind, const char *command, bool success, int code, int status); + +int unit_exit_status(Unit *u); +int unit_success_action_exit_status(Unit *u); +int unit_failure_action_exit_status(Unit *u); + +int unit_test_trigger_loaded(Unit *u); + +void unit_destroy_runtime_data(Unit *u, const ExecContext *context); +int unit_clean(Unit *u, ExecCleanMask mask); +int unit_can_clean(Unit *u, ExecCleanMask *ret_mask); + +bool unit_can_freeze(Unit *u); +int unit_freeze(Unit *u); +void unit_frozen(Unit *u); + +int unit_thaw(Unit *u); +void unit_thawed(Unit *u); + +int unit_freeze_vtable_common(Unit *u); +int unit_thaw_vtable_common(Unit *u); + +/* Macros which append UNIT= or USER_UNIT= to the message */ + +#define log_unit_full_errno(unit, level, error, ...) \ + ({ \ + const Unit *_u = (unit); \ + (log_get_max_level() < LOG_PRI(level)) ? -ERRNO_VALUE(error) : \ + _u ? log_object_internal(level, error, PROJECT_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, PROJECT_FILE, __LINE__, __func__, ##__VA_ARGS__); \ + }) + +#define log_unit_full(unit, level, ...) (void) log_unit_full_errno(unit, level, 0, __VA_ARGS__) + +#define log_unit_debug(unit, ...) log_unit_full_errno(unit, LOG_DEBUG, 0, __VA_ARGS__) +#define log_unit_info(unit, ...) log_unit_full(unit, LOG_INFO, __VA_ARGS__) +#define log_unit_notice(unit, ...) log_unit_full(unit, LOG_NOTICE, __VA_ARGS__) +#define log_unit_warning(unit, ...) log_unit_full(unit, LOG_WARNING, __VA_ARGS__) +#define log_unit_error(unit, ...) log_unit_full(unit, LOG_ERR, __VA_ARGS__) + +#define log_unit_debug_errno(unit, error, ...) log_unit_full_errno(unit, LOG_DEBUG, error, __VA_ARGS__) +#define log_unit_info_errno(unit, error, ...) log_unit_full_errno(unit, LOG_INFO, error, __VA_ARGS__) +#define log_unit_notice_errno(unit, error, ...) log_unit_full_errno(unit, LOG_NOTICE, error, __VA_ARGS__) +#define log_unit_warning_errno(unit, error, ...) log_unit_full_errno(unit, LOG_WARNING, error, __VA_ARGS__) +#define log_unit_error_errno(unit, error, ...) log_unit_full_errno(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_; |