/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ #ifndef foounithfoo #define foounithfoo /*** 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 General Public License as published by the Free Software Foundation; either version 2 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 General Public License for more details. You should have received a copy of the GNU General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <stdbool.h> #include <stdlib.h> typedef union Unit Unit; typedef struct Meta Meta; typedef struct UnitVTable UnitVTable; typedef enum UnitType UnitType; typedef enum UnitLoadState UnitLoadState; typedef enum UnitActiveState UnitActiveState; typedef enum UnitDependency UnitDependency; #include "set.h" #include "util.h" #include "list.h" #include "socket-util.h" #include "execute.h" #include "condition.h" #define DEFAULT_TIMEOUT_USEC (60*USEC_PER_SEC) #define DEFAULT_RESTART_USEC (100*USEC_PER_MSEC) enum UnitType { UNIT_SERVICE = 0, UNIT_SOCKET, UNIT_TARGET, UNIT_DEVICE, UNIT_MOUNT, UNIT_AUTOMOUNT, UNIT_SNAPSHOT, UNIT_TIMER, UNIT_SWAP, UNIT_PATH, _UNIT_TYPE_MAX, _UNIT_TYPE_INVALID = -1 }; enum UnitLoadState { UNIT_STUB, UNIT_LOADED, UNIT_ERROR, UNIT_MERGED, UNIT_MASKED, _UNIT_LOAD_STATE_MAX, _UNIT_LOAD_STATE_INVALID = -1 }; 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_BIND_TO, /* 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 'bind_to' */ /* 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, /* 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" #include "cgroup.h" struct Meta { 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 *description; char *fragment_path; /* if loaded from a config file this is the primary path to it */ usec_t fragment_mtime; /* If there is something to do with this unit, then this is * the job for it */ Job *job; usec_t job_timeout; /* Conditions to check */ LIST_HEAD(Condition, conditions); 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 */ CGroupBonding *cgroup_bondings; /* Per type list */ LIST_FIELDS(Meta, units_per_type); /* Load queue */ LIST_FIELDS(Meta, load_queue); /* D-Bus queue */ LIST_FIELDS(Meta, dbus_queue); /* Cleanup queue */ LIST_FIELDS(Meta, cleanup_queue); /* GC queue */ LIST_FIELDS(Meta, gc_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 */ int deserialized_job; /* This is actually of type JobType */ /* Error code when we didn't manage to load the unit (negative) */ int load_error; /* Garbage collect us we nobody wants or requires us anymore */ bool stop_when_unneeded; /* Create default depedencies */ 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; bool in_load_queue:1; bool in_dbus_queue:1; bool in_cleanup_queue:1; bool in_gc_queue:1; bool sent_dbus_new_signal:1; bool no_gc:1; bool in_audit:1; }; #include "service.h" #include "timer.h" #include "socket.h" #include "target.h" #include "device.h" #include "mount.h" #include "automount.h" #include "snapshot.h" #include "swap.h" #include "path.h" union Unit { Meta meta; Service service; Timer timer; Socket socket; Target target; Device device; Mount mount; Automount automount; Snapshot snapshot; Swap swap; Path path; }; struct UnitVTable { const char *suffix; /* 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 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, KillMode m, int signo, DBusError *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); /* 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 finegrained 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); void (*fd_event)(Unit *u, int fd, uint32_t events, Watch *w); void (*sigchld_event)(Unit *u, pid_t pid, int code, int status); void (*timer_event)(Unit *u, uint64_t n_elapsed, Watch *w); /* 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 (*cgroup_notify_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 thus 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 whenever a bus PID lookup finishes */ void (*bus_query_pid_done)(Unit *u, const char *name, pid_t pid); /* Called for each message received on the bus */ DBusHandlerResult (*bus_message_handler)(Unit *u, DBusConnection *c, DBusMessage *message); /* Return the unit this unit is following */ Unit *(*following)(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); /* When sending out PropertiesChanged signal, which properties * shall be invalidated? This is a NUL separated list of * strings, to minimize relocations a little. */ const char *bus_invalidating_properties; /* The interface name */ const char *bus_interface; /* Can units of this type have multiple names? */ bool no_alias:1; /* If true units of this types can never have "Requires" * dependencies, because state changes can only be observed, * not triggered */ bool no_requires:1; /* Instances make no sense for this type */ bool no_instances:1; /* Exclude this type from snapshots */ bool no_snapshots:1; /* Exclude from automatic gc */ bool no_gc:1; /* Exclude from stopping on isolation requests */ bool no_isolate:1; /* Show status updates on the console */ bool show_status:1; }; extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX]; #define UNIT_VTABLE(u) unit_vtable[(u)->meta.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->meta.type != UNIT_##UPPERCASE)) \ return NULL; \ \ return (MixedCase*) u; \ } /* For casting the various unit types into a unit */ #define UNIT(u) ((Unit*) (&(u)->meta)) DEFINE_CAST(SOCKET, Socket); DEFINE_CAST(TIMER, Timer); DEFINE_CAST(SERVICE, Service); DEFINE_CAST(TARGET, Target); DEFINE_CAST(DEVICE, Device); DEFINE_CAST(MOUNT, Mount); DEFINE_CAST(AUTOMOUNT, Automount); DEFINE_CAST(SNAPSHOT, Snapshot); DEFINE_CAST(SWAP, Swap); DEFINE_CAST(PATH, Path); Unit *unit_new(Manager *m); 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_add_cgroup(Unit *u, CGroupBonding *b); int unit_add_cgroup_from_text(Unit *u, const char *name); int unit_add_default_cgroup(Unit *u); CGroupBonding* unit_get_default_cgroup(Unit *u); 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); int unit_load_fragment_and_dropin(Unit *u); int unit_load_fragment_and_dropin_optional(Unit *u); int unit_load(Unit *unit); const char *unit_description(Unit *u); 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); bool unit_can_start(Unit *u); bool unit_can_isolate(Unit *u); int unit_start(Unit *u); int unit_stop(Unit *u); int unit_reload(Unit *u); int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error); void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns); int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w); void unit_unwatch_fd(Unit *u, Watch *w); int unit_watch_pid(Unit *u, pid_t pid); void unit_unwatch_pid(Unit *u, pid_t pid); int unit_watch_timer(Unit *u, usec_t delay, Watch *w); void unit_unwatch_timer(Unit *u, Watch *w); 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); int unit_get_related_unit(Unit *u, const char *type, Unit **_found); char *unit_name_printf(Unit *u, const char* text); char *unit_full_printf(Unit *u, const char *text); char **unit_full_printf_strv(Unit *u, char **l); bool unit_can_serialize(Unit *u); int unit_serialize(Unit *u, FILE *f, FDSet *fds); void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *value, ...) _printf_attr_(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 *format, ...); bool unit_need_daemon_reload(Unit *u); void unit_reset_failed(Unit *u); Unit *unit_following(Unit *u); bool unit_pending_inactive(Unit *u); bool unit_pending_active(Unit *u); int unit_add_default_target_dependency(Unit *u, Unit *target); UnitType unit_name_to_type(const char *n); bool unit_name_is_valid(const char *n, bool template_ok); const char *unit_load_state_to_string(UnitLoadState i); UnitLoadState unit_load_state_from_string(const char *s); const char *unit_active_state_to_string(UnitActiveState i); UnitActiveState unit_active_state_from_string(const char *s); const char *unit_dependency_to_string(UnitDependency i); UnitDependency unit_dependency_from_string(const char *s); #endif