/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ #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 enum UnitActiveState UnitActiveState; typedef enum UnitDependency UnitDependency; typedef struct UnitRef UnitRef; typedef struct UnitStatusMessageFormats UnitStatusMessageFormats; #include "sd-event.h" #include "set.h" #include "util.h" #include "list.h" #include "socket-util.h" #include "execute.h" #include "cgroup.h" #include "condition.h" #include "install.h" #include "unit-name.h" enum UnitActiveState { UNIT_ACTIVE, UNIT_RELOADING, UNIT_INACTIVE, UNIT_FAILED, UNIT_ACTIVATING, UNIT_DEACTIVATING, _UNIT_ACTIVE_STATE_MAX, _UNIT_ACTIVE_STATE_INVALID = -1 }; static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) { return t == UNIT_ACTIVE || t == UNIT_RELOADING; } static inline bool UNIT_IS_ACTIVE_OR_ACTIVATING(UnitActiveState t) { return t == UNIT_ACTIVE || t == UNIT_ACTIVATING || t == UNIT_RELOADING; } static inline bool UNIT_IS_INACTIVE_OR_DEACTIVATING(UnitActiveState t) { return t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING; } static inline bool UNIT_IS_INACTIVE_OR_FAILED(UnitActiveState t) { return t == UNIT_INACTIVE || t == UNIT_FAILED; } enum UnitDependency { /* Positive dependencies */ UNIT_REQUIRES, UNIT_REQUIRES_OVERRIDABLE, UNIT_REQUISITE, UNIT_REQUISITE_OVERRIDABLE, UNIT_WANTS, UNIT_BINDS_TO, UNIT_PART_OF, /* Inverse of the above */ UNIT_REQUIRED_BY, /* inverse of 'requires' and 'requisite' is 'required_by' */ UNIT_REQUIRED_BY_OVERRIDABLE, /* inverse of 'requires_overridable' and 'requisite_overridable' is 'soft_required_by' */ UNIT_WANTED_BY, /* inverse of 'wants' */ UNIT_BOUND_BY, /* inverse of 'binds_to' */ UNIT_CONSISTS_OF, /* inverse of 'part_of' */ /* Negative dependencies */ UNIT_CONFLICTS, /* inverse of 'conflicts' is 'conflicted_by' */ UNIT_CONFLICTED_BY, /* Order */ UNIT_BEFORE, /* inverse of 'before' is 'after' and vice versa */ UNIT_AFTER, /* On Failure */ UNIT_ON_FAILURE, /* Triggers (i.e. a socket triggers a service) */ UNIT_TRIGGERS, UNIT_TRIGGERED_BY, /* Propagate reloads */ UNIT_PROPAGATES_RELOAD_TO, UNIT_RELOAD_PROPAGATED_FROM, /* Joins namespace of */ UNIT_JOINS_NAMESPACE_OF, /* Reference information for GC logic */ UNIT_REFERENCES, /* Inverse of 'references' is 'referenced_by' */ UNIT_REFERENCED_BY, _UNIT_DEPENDENCY_MAX, _UNIT_DEPENDENCY_INVALID = -1 }; #include "manager.h" #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); }; 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; Set *dependencies[_UNIT_DEPENDENCY_MAX]; char **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 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; usec_t job_timeout; /* References to this */ LIST_HEAD(UnitRef, refs); /* Conditions to check */ LIST_HEAD(Condition, conditions); dual_timestamp condition_timestamp; dual_timestamp inactive_exit_timestamp; dual_timestamp active_enter_timestamp; dual_timestamp active_exit_timestamp; dual_timestamp inactive_enter_timestamp; /* Counterparts in the cgroup filesystem */ char *cgroup_path; CGroupControllerMask cgroup_mask; CGroupControllerMask cgroup_members_mask; 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_queue); /* Used during GC sweeps */ unsigned gc_marker; /* When deserializing, temporarily store the job type for this * unit here, if there was a job scheduled. * Only for deserializing from a legacy version. New style uses full * serialized jobs. */ int deserialized_job; /* This is actually of type JobType */ /* Error code when we didn't manage to load the unit (negative) */ int load_error; /* Cached unit file state */ UnitFileState unit_file_state; /* 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; /* How to start OnFailure units */ JobMode on_failure_job_mode; /* Ignore this unit when isolating */ bool ignore_on_isolate; /* Ignore this unit when snapshotting */ bool ignore_on_snapshot; /* Did the last condition check succeed? */ bool condition_result; /* Is this a transient unit? */ bool transient; bool in_load_queue:1; bool in_dbus_queue:1; bool in_cleanup_queue:1; bool in_gc_queue:1; bool in_cgroup_queue:1; bool sent_dbus_new_signal:1; bool no_gc:1; bool in_audit:1; bool cgroup_realized: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 "service.h" #include "socket.h" #include "busname.h" #include "target.h" #include "snapshot.h" #include "device.h" #include "mount.h" #include "automount.h" #include "swap.h" #include "timer.h" #include "path.h" #include "slice.h" #include "scope.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; /* 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 */ int (*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); /* Return true when this unit is suitable for snapshotting */ bool (*check_snapshot)(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, pid_t pid, char **tags); /* 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); /* 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. */ int (*enumerate)(Manager *m); /* Type specific cleanups. */ void (*shutdown)(Manager *m); /* The interface name */ const char *bus_interface; /* The bus vtable */ const sd_bus_vtable *bus_vtable; /* The strings to print in status messages */ UnitStatusMessageFormats status_message_formats; /* Can units of this type have multiple names? */ bool no_alias:1; /* Instances make no sense for this type */ bool no_instances:1; /* Exclude from automatic gc */ bool no_gc:1; /* True if transient units of this type are OK */ bool can_transient: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_TRIGGER(u) ((Unit*) set_first((u)->dependencies[UNIT_TRIGGERS])) DEFINE_CAST(SERVICE, Service); DEFINE_CAST(SOCKET, Socket); DEFINE_CAST(BUSNAME, BusName); DEFINE_CAST(TARGET, Target); DEFINE_CAST(SNAPSHOT, Snapshot); 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_add_name(Unit *u, const char *name); int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference); int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference); int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference); int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference); int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference); int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference); 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_add_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_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); 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); 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); void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_(4,5); void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value); int unit_deserialize(Unit *u, FILE *f, FDSet *fds); int unit_add_node_link(Unit *u, const char *what, bool wants); int unit_coldplug(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); int unit_add_default_target_dependency(Unit *u, Unit *target); char *unit_default_cgroup_path(Unit *u); void unit_start_on_failure(Unit *u); void unit_trigger_notify(Unit *u); UnitFileState unit_get_unit_file_state(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_exec_context_defaults(Unit *u, ExecContext *c); 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_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_remove_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name); int unit_kill_context(Unit *u, KillContext *c, bool sigkill, 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); const char *unit_active_state_to_string(UnitActiveState i) _const_; UnitActiveState unit_active_state_from_string(const char *s) _pure_; const char *unit_dependency_to_string(UnitDependency i) _const_; UnitDependency unit_dependency_from_string(const char *s) _pure_; /* Macros which append UNIT= or USER_UNIT= to the message */ #define log_full_unit(level, unit, ...) log_meta_object(level, __FILE__, __LINE__, __func__, getpid() == 1 ? "UNIT=" : "USER_UNIT=", unit, __VA_ARGS__) #define log_debug_unit(unit, ...) log_full_unit(LOG_DEBUG, unit, __VA_ARGS__) #define log_info_unit(unit, ...) log_full_unit(LOG_INFO, unit, __VA_ARGS__) #define log_notice_unit(unit, ...) log_full_unit(LOG_NOTICE, unit, __VA_ARGS__) #define log_warning_unit(unit, ...) log_full_unit(LOG_WARNING, unit, __VA_ARGS__) #define log_error_unit(unit, ...) log_full_unit(LOG_ERR, unit, __VA_ARGS__) #define log_struct_unit(level, unit, ...) log_struct(level, getpid() == 1 ? "UNIT=%s" : "USER_UNIT=%s", unit, __VA_ARGS__)