/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-***/
-
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
KILL_TERMINATE,
KILL_TERMINATE_AND_LOG,
KILL_KILL,
- KILL_ABORT,
+ KILL_WATCHDOG,
_KILL_OPERATION_MAX,
_KILL_OPERATION_INVALID = -1
} KillOperation;
/* 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,
+ _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
/* 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 */
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;
bool in_cgroup_realize_queue:1;
bool in_cgroup_empty_queue:1;
bool in_target_deps_queue:1;
+ bool in_stop_when_unneeded_queue:1;
bool sent_dbus_new_signal: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. */
- int last_section_private:2;
+ signed int last_section_private:2;
} Unit;
typedef struct UnitStatusMessageFormats {
* 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(). */
+ /* 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. */
int (*coldplug)(Unit *u);
+ /* This is called shortly after all units' coldplug() call was invoked. It's supposed to catch up state changes
+ * 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);
/* 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 true if the unit currently needs access to the console */
bool (*needs_console)(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. */
+ /* 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. */
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_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);
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);
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);
+typedef enum UnitNotifyFlags {
+ UNIT_NOTIFY_RELOAD_FAILURE = 1 << 0,
+ UNIT_NOTIFY_WILL_AUTO_RESTART = 1 << 1,
+} UnitNotifyFlags;
+
+void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, UnitNotifyFlags flags);
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_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);
int unit_add_node_dependency(Unit *u, const char *what, bool wants, UnitDependency d, UnitDependencyMask mask);
int unit_coldplug(Unit *u);
+void unit_catchup(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_is_pristine(Unit *u);
+bool unit_is_unneeded(Unit *u);
+
pid_t unit_control_pid(Unit *u);
pid_t unit_main_pid(Unit *u);
projects / thirdparty / systemd.git / blobdiff