/* 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>
/* 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
* 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_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 = 1U << 0,
- UNIT_NOTIFY_WILL_AUTO_RESTART = 1U << 1,
+ 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_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);