X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcore%2Funit.h;h=b5a224b3d4d737740c8242e0d4ee67462c205329;hp=0f121e244e2984a7a96928b8d20bb05d5c7d41e1;hb=493657337ad8569e0998a3afa7d6fb357757364a;hpb=b1e2b33c5258f1cefcee55116ac5d049478c804d diff --git a/src/core/unit.h b/src/core/unit.h index 0f121e244..b5a224b3d 100644 --- a/src/core/unit.h +++ b/src/core/unit.h @@ -28,19 +28,20 @@ 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 "condition.h" +#include "cgroup.h" +#include "condition-util.h" #include "install.h" #include "unit-name.h" -#include "cgroup-semantics.h" +#include "failure-action.h" enum UnitActiveState { UNIT_ACTIVE, @@ -53,6 +54,12 @@ enum UnitActiveState { _UNIT_ACTIVE_STATE_INVALID = -1 }; +typedef enum KillOperation { + KILL_TERMINATE, + KILL_KILL, + KILL_ABORT, +} KillOperation; + static inline bool UNIT_IS_ACTIVE_OR_RELOADING(UnitActiveState t) { return t == UNIT_ACTIVE || t == UNIT_RELOADING; } @@ -69,54 +76,17 @@ 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, - - /* 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" -#include "cgroup-attr.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; @@ -149,24 +119,27 @@ struct Unit { /* JOB_NOP jobs are special and can be installed without disturbing the real job. */ Job *nop_job; + /* Job timeout and action to take */ usec_t job_timeout; + FailureAction 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; 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; - CGroupAttribute *cgroup_attributes; + UnitRef slice; /* Per type list */ LIST_FIELDS(Unit, units_by_type); @@ -186,6 +159,14 @@ struct Unit { /* GC queue */ LIST_FIELDS(Unit, gc_queue); + /* CGroup realize members queue */ + LIST_FIELDS(Unit, cgroup_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 during GC sweeps */ unsigned gc_marker; @@ -201,6 +182,15 @@ struct Unit { /* Cached unit file state */ UnitFileState unit_file_state; + /* Counterparts in the cgroup filesystem */ + char *cgroup_path; + CGroupControllerMask cgroup_realized_mask; + CGroupControllerMask cgroup_subtree_mask; + CGroupControllerMask cgroup_members_mask; + + /* How to start OnFailure units */ + JobMode on_failure_job_mode; + /* Garbage collect us we nobody wants or requires us anymore */ bool stop_when_unneeded; @@ -216,9 +206,6 @@ struct Unit { /* Allow isolation requests */ bool allow_isolate; - /* Isolate OnFailure unit */ - bool on_failure_isolate; - /* Ignore this unit when isolating */ bool ignore_on_isolate; @@ -227,26 +214,26 @@ struct Unit { /* Did the last condition check succeed? */ bool condition_result; + bool assert_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; -}; -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); + bool cgroup_realized:1; + bool cgroup_members_mask_valid:1; + bool cgroup_subtree_mask_valid:1; }; struct UnitStatusMessageFormats { @@ -255,16 +242,25 @@ struct UnitStatusMessageFormats { 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 "timer.h" #include "socket.h" +#include "busname.h" #include "target.h" +#include "snapshot.h" #include "device.h" #include "mount.h" #include "automount.h" -#include "snapshot.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 */ @@ -274,8 +270,21 @@ struct UnitVTable { * ExecContext is found, if the unit type has that */ size_t exec_context_offset; - /* The name of the section with the exec settings of ExecContext */ - const char *exec_section; + /* 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 */ @@ -306,7 +315,7 @@ struct UnitVTable { int (*stop)(Unit *u); int (*reload)(Unit *u); - int (*kill)(Unit *u, KillWho w, int signo, DBusError *error); + int (*kill)(Unit *u, KillWho w, int signo, sd_bus_error *error); bool (*can_reload)(Unit *u); @@ -338,16 +347,15 @@ struct UnitVTable { /* 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); + /* Invoked on every child that died */ 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); + 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); @@ -356,11 +364,11 @@ struct UnitVTable { * 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 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 for each message received on the bus */ - DBusHandlerResult (*bus_message_handler)(Unit *u, DBusConnection *c, DBusMessage *message); + /* 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); @@ -375,6 +383,8 @@ struct UnitVTable { /* Called whenever CLOCK_REALTIME made a jump */ void (*time_change)(Unit *u); + int (*get_timeout)(Unit *u, uint64_t *timeout); + /* 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 @@ -385,14 +395,13 @@ struct UnitVTable { /* 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; + /* 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? */ @@ -403,6 +412,9 @@ struct UnitVTable { /* 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]; @@ -423,16 +435,19 @@ extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX]; #define UNIT_TRIGGER(u) ((Unit*) set_first((u)->dependencies[UNIT_TRIGGERS])) -DEFINE_CAST(SOCKET, Socket); -DEFINE_CAST(TIMER, Timer); 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(SNAPSHOT, Snapshot); 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); @@ -450,11 +465,6 @@ int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDep int unit_add_exec_dependencies(Unit *u, ExecContext *c); -int unit_add_cgroup_from_text(Unit *u, const char *name, bool overwrite, CGroupBonding **ret); -int unit_add_default_cgroups(Unit *u); -CGroupBonding* unit_get_default_cgroup(Unit *u); -int unit_add_cgroup_attribute(Unit *u, const CGroupSemantics *semantics, const char *controller, const char *name, const char *value, CGroupAttribute **ret); - int unit_choose_id(Unit *u, const char *name); int unit_set_description(Unit *u, const char *description); @@ -468,13 +478,15 @@ 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); +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); -const char *unit_description(Unit *u); +int unit_add_default_slice(Unit *u, CGroupContext *c); + +const char *unit_description(Unit *u) _pure_; bool unit_has_name(Unit *u, const char *name); @@ -484,27 +496,25 @@ 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); +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, DBusError *error); -int unit_kill_common(Unit *u, KillWho who, int signo, pid_t main_pid, pid_t control_pid, DBusError *error); +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_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_all_pids(Unit *u); +void unit_unwatch_all_pids(Unit *u); -int unit_watch_timer(Unit *u, clockid_t, bool relative, usec_t usec, Watch *w); -void unit_unwatch_timer(Unit *u, Watch *w); +void unit_tidy_watch_pids(Unit *u, pid_t except1, pid_t except2); int unit_watch_bus_name(Unit *u, const char *name); void unit_unwatch_bus_name(Unit *u, const char *name); @@ -516,11 +526,10 @@ 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); -bool unit_can_serialize(Unit *u); +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_attr_(4,5); +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); @@ -528,53 +537,62 @@ 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_attr_(3, 0); +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); -bool unit_inactive_or_pending(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); -int unit_following_set(Unit *u, Set **s); - void unit_start_on_failure(Unit *u); void unit_trigger_notify(Unit *u); -bool unit_condition_test(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_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_add_one_mount_link(Unit *u, Mount *m); -int unit_add_mount_links(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_exec_context_defaults(Unit *u, ExecContext *c); +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); -ExecContext *unit_get_exec_context(Unit *u); +int unit_remove_drop_in(Unit *u, UnitSetPropertiesMode mode, const char *name); -int unit_write_drop_in(Unit *u, bool runtime, const char *name, const char *data); -int unit_remove_drop_in(Unit *u, bool runtime, const char *name); +int unit_kill_context(Unit *u, KillContext *c, KillOperation k, pid_t main_pid, pid_t control_pid, bool main_pid_alien); -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); -const char *unit_active_state_to_string(UnitActiveState i); -UnitActiveState unit_active_state_from_string(const char *s); +int unit_require_mounts_for(Unit *u, const char *path); -const char *unit_dependency_to_string(UnitDependency i); -UnitDependency unit_dependency_from_string(const char *s); +const char *unit_active_state_to_string(UnitActiveState i) _const_; +UnitActiveState unit_active_state_from_string(const char *s) _pure_; /* Macros which append UNIT= or USER_UNIT= to the message */