cda667722c
When a command asks to load a unit directly and it is in state UNIT_NOT_FOUND, and the cache is outdated, we refresh it and attempto to load again. Use the same logic when building up a transaction and a dependency in UNIT_NOT_FOUND state is encountered. Update the unit test to exercise this code path.
565 lines
20 KiB
C
565 lines
20 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <stdbool.h>
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#include <stdio.h>
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#include "sd-bus.h"
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#include "sd-device.h"
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#include "sd-event.h"
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#include "cgroup-util.h"
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#include "cgroup.h"
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#include "fdset.h"
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#include "hashmap.h"
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#include "ip-address-access.h"
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#include "list.h"
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#include "prioq.h"
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#include "ratelimit.h"
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#include "varlink.h"
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struct libmnt_monitor;
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typedef struct Unit Unit;
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/* Enforce upper limit how many names we allow */
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#define MANAGER_MAX_NAMES 131072 /* 128K */
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typedef struct Manager Manager;
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/* An externally visible state. We don't actually maintain this as state variable, but derive it from various fields
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* when requested */
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typedef enum ManagerState {
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MANAGER_INITIALIZING,
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MANAGER_STARTING,
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MANAGER_RUNNING,
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MANAGER_DEGRADED,
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MANAGER_MAINTENANCE,
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MANAGER_STOPPING,
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_MANAGER_STATE_MAX,
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_MANAGER_STATE_INVALID = -1
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} ManagerState;
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typedef enum ManagerObjective {
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MANAGER_OK,
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MANAGER_EXIT,
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MANAGER_RELOAD,
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MANAGER_REEXECUTE,
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MANAGER_REBOOT,
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MANAGER_POWEROFF,
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MANAGER_HALT,
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MANAGER_KEXEC,
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MANAGER_SWITCH_ROOT,
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_MANAGER_OBJECTIVE_MAX,
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_MANAGER_OBJECTIVE_INVALID = -1
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} ManagerObjective;
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typedef enum StatusType {
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STATUS_TYPE_EPHEMERAL,
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STATUS_TYPE_NORMAL,
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STATUS_TYPE_NOTICE,
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STATUS_TYPE_EMERGENCY,
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} StatusType;
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typedef enum OOMPolicy {
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OOM_CONTINUE, /* The kernel kills the process it wants to kill, and that's it */
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OOM_STOP, /* The kernel kills the process it wants to kill, and we stop the unit */
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OOM_KILL, /* The kernel kills the process it wants to kill, and all others in the unit, and we stop the unit */
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_OOM_POLICY_MAX,
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_OOM_POLICY_INVALID = -1
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} OOMPolicy;
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/* Notes:
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* 1. TIMESTAMP_FIRMWARE, TIMESTAMP_LOADER, TIMESTAMP_KERNEL, TIMESTAMP_INITRD,
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* TIMESTAMP_SECURITY_START, and TIMESTAMP_SECURITY_FINISH are set only when
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* the manager is system and not running under container environment.
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*
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* 2. The monotonic timestamp of TIMESTAMP_KERNEL is always zero.
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*
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* 3. The realtime timestamp of TIMESTAMP_KERNEL will be unset if the system does not
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* have RTC.
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*
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* 4. TIMESTAMP_FIRMWARE and TIMESTAMP_LOADER will be unset if the system does not
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* have RTC, or systemd is built without EFI support.
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*
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* 5. The monotonic timestamps of TIMESTAMP_FIRMWARE and TIMESTAMP_LOADER are stored as
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* negative of the actual value.
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*
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* 6. TIMESTAMP_USERSPACE is the timestamp of when the manager was started.
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*
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* 7. TIMESTAMP_INITRD_* are set only when the system is booted with an initrd.
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*/
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typedef enum ManagerTimestamp {
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MANAGER_TIMESTAMP_FIRMWARE,
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MANAGER_TIMESTAMP_LOADER,
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MANAGER_TIMESTAMP_KERNEL,
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MANAGER_TIMESTAMP_INITRD,
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MANAGER_TIMESTAMP_USERSPACE,
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MANAGER_TIMESTAMP_FINISH,
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MANAGER_TIMESTAMP_SECURITY_START,
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MANAGER_TIMESTAMP_SECURITY_FINISH,
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MANAGER_TIMESTAMP_GENERATORS_START,
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MANAGER_TIMESTAMP_GENERATORS_FINISH,
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MANAGER_TIMESTAMP_UNITS_LOAD_START,
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MANAGER_TIMESTAMP_UNITS_LOAD_FINISH,
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MANAGER_TIMESTAMP_INITRD_SECURITY_START,
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MANAGER_TIMESTAMP_INITRD_SECURITY_FINISH,
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MANAGER_TIMESTAMP_INITRD_GENERATORS_START,
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MANAGER_TIMESTAMP_INITRD_GENERATORS_FINISH,
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MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_START,
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MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_FINISH,
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_MANAGER_TIMESTAMP_MAX,
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_MANAGER_TIMESTAMP_INVALID = -1,
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} ManagerTimestamp;
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typedef enum WatchdogType {
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WATCHDOG_RUNTIME,
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WATCHDOG_REBOOT,
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WATCHDOG_KEXEC,
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_WATCHDOG_TYPE_MAX,
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} WatchdogType;
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#include "execute.h"
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#include "job.h"
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#include "path-lookup.h"
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#include "show-status.h"
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#include "unit-name.h"
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typedef enum ManagerTestRunFlags {
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MANAGER_TEST_NORMAL = 0, /* run normally */
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MANAGER_TEST_RUN_MINIMAL = 1 << 0, /* create basic data structures */
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MANAGER_TEST_RUN_BASIC = 1 << 1, /* interact with the environment */
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MANAGER_TEST_RUN_ENV_GENERATORS = 1 << 2, /* also run env generators */
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MANAGER_TEST_RUN_GENERATORS = 1 << 3, /* also run unit generators */
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MANAGER_TEST_FULL = MANAGER_TEST_RUN_BASIC | MANAGER_TEST_RUN_ENV_GENERATORS | MANAGER_TEST_RUN_GENERATORS,
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} ManagerTestRunFlags;
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assert_cc((MANAGER_TEST_FULL & UINT8_MAX) == MANAGER_TEST_FULL);
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struct Manager {
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/* Note that the set of units we know of is allowed to be
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* inconsistent. However the subset of it that is loaded may
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* not, and the list of jobs may neither. */
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/* Active jobs and units */
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Hashmap *units; /* name string => Unit object n:1 */
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Hashmap *units_by_invocation_id;
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Hashmap *jobs; /* job id => Job object 1:1 */
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/* To make it easy to iterate through the units of a specific
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* type we maintain a per type linked list */
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LIST_HEAD(Unit, units_by_type[_UNIT_TYPE_MAX]);
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/* Units that need to be loaded */
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LIST_HEAD(Unit, load_queue); /* this is actually more a stack than a queue, but uh. */
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/* Jobs that need to be run */
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struct Prioq *run_queue;
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/* Units and jobs that have not yet been announced via
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* D-Bus. When something about a job changes it is added here
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* if it is not in there yet. This allows easy coalescing of
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* D-Bus change signals. */
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LIST_HEAD(Unit, dbus_unit_queue);
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LIST_HEAD(Job, dbus_job_queue);
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/* Units to remove */
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LIST_HEAD(Unit, cleanup_queue);
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/* Units and jobs to check when doing GC */
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LIST_HEAD(Unit, gc_unit_queue);
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LIST_HEAD(Job, gc_job_queue);
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/* Units that should be realized */
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LIST_HEAD(Unit, cgroup_realize_queue);
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/* Units whose cgroup ran empty */
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LIST_HEAD(Unit, cgroup_empty_queue);
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/* Units whose memory.event fired */
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LIST_HEAD(Unit, cgroup_oom_queue);
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/* Target units whose default target dependencies haven't been set yet */
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LIST_HEAD(Unit, target_deps_queue);
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/* Units that might be subject to StopWhenUnneeded= clean-up */
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LIST_HEAD(Unit, stop_when_unneeded_queue);
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sd_event *event;
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/* This maps PIDs we care about to units that are interested in. We allow multiple units to he interested in
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* the same PID and multiple PIDs to be relevant to the same unit. Since in most cases only a single unit will
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* be interested in the same PID we use a somewhat special encoding here: the first unit interested in a PID is
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* stored directly in the hashmap, keyed by the PID unmodified. If there are other units interested too they'll
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* be stored in a NULL-terminated array, and keyed by the negative PID. This is safe as pid_t is signed and
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* negative PIDs are not used for regular processes but process groups, which we don't care about in this
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* context, but this allows us to use the negative range for our own purposes. */
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Hashmap *watch_pids; /* pid => unit as well as -pid => array of units */
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/* A set contains all units which cgroup should be refreshed after startup */
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Set *startup_units;
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/* A set which contains all currently failed units */
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Set *failed_units;
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sd_event_source *run_queue_event_source;
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char *notify_socket;
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int notify_fd;
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sd_event_source *notify_event_source;
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int cgroups_agent_fd;
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sd_event_source *cgroups_agent_event_source;
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int signal_fd;
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sd_event_source *signal_event_source;
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sd_event_source *sigchld_event_source;
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int time_change_fd;
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sd_event_source *time_change_event_source;
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sd_event_source *timezone_change_event_source;
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sd_event_source *jobs_in_progress_event_source;
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int user_lookup_fds[2];
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sd_event_source *user_lookup_event_source;
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UnitFileScope unit_file_scope;
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LookupPaths lookup_paths;
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Hashmap *unit_id_map;
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Hashmap *unit_name_map;
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Set *unit_path_cache;
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usec_t unit_cache_mtime;
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char **transient_environment; /* The environment, as determined from config files, kernel cmdline and environment generators */
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char **client_environment; /* Environment variables created by clients through the bus API */
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usec_t watchdog[_WATCHDOG_TYPE_MAX];
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usec_t watchdog_overridden[_WATCHDOG_TYPE_MAX];
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dual_timestamp timestamps[_MANAGER_TIMESTAMP_MAX];
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/* Data specific to the device subsystem */
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sd_device_monitor *device_monitor;
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Hashmap *devices_by_sysfs;
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/* Data specific to the mount subsystem */
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struct libmnt_monitor *mount_monitor;
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sd_event_source *mount_event_source;
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/* Data specific to the swap filesystem */
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FILE *proc_swaps;
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sd_event_source *swap_event_source;
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Hashmap *swaps_by_devnode;
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/* Data specific to the D-Bus subsystem */
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sd_bus *api_bus, *system_bus;
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Set *private_buses;
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int private_listen_fd;
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sd_event_source *private_listen_event_source;
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/* Contains all the clients that are subscribed to signals via
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the API bus. Note that private bus connections are always
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considered subscribes, since they last for very short only,
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and it is much simpler that way. */
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sd_bus_track *subscribed;
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char **deserialized_subscribed;
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/* This is used during reloading: before the reload we queue
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* the reply message here, and afterwards we send it */
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sd_bus_message *pending_reload_message;
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Hashmap *watch_bus; /* D-Bus names => Unit object n:1 */
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bool send_reloading_done;
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uint32_t current_job_id;
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uint32_t default_unit_job_id;
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/* Data specific to the Automount subsystem */
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int dev_autofs_fd;
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/* Data specific to the cgroup subsystem */
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Hashmap *cgroup_unit;
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CGroupMask cgroup_supported;
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char *cgroup_root;
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/* Notifications from cgroups, when the unified hierarchy is used is done via inotify. */
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int cgroup_inotify_fd;
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sd_event_source *cgroup_inotify_event_source;
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/* Maps for finding the unit for each inotify watch descriptor for the cgroup.events and
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* memory.events cgroupv2 attributes. */
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Hashmap *cgroup_control_inotify_wd_unit;
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Hashmap *cgroup_memory_inotify_wd_unit;
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/* A defer event for handling cgroup empty events and processing them after SIGCHLD in all cases. */
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sd_event_source *cgroup_empty_event_source;
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sd_event_source *cgroup_oom_event_source;
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/* Make sure the user cannot accidentally unmount our cgroup
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* file system */
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int pin_cgroupfs_fd;
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unsigned gc_marker;
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/* The stat() data the last time we saw /etc/localtime */
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usec_t etc_localtime_mtime;
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bool etc_localtime_accessible:1;
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ManagerObjective objective:5;
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/* Flags */
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bool dispatching_load_queue:1;
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bool taint_usr:1;
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/* Have we already sent out the READY=1 notification? */
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bool ready_sent:1;
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/* Have we already printed the taint line if necessary? */
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bool taint_logged:1;
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/* Have we ever changed the "kernel.pid_max" sysctl? */
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bool sysctl_pid_max_changed:1;
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ManagerTestRunFlags test_run_flags:8;
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/* If non-zero, exit with the following value when the systemd
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* process terminate. Useful for containers: systemd-nspawn could get
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* the return value. */
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uint8_t return_value;
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ShowStatus show_status;
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ShowStatus show_status_overridden;
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StatusUnitFormat status_unit_format;
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char *confirm_spawn;
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bool no_console_output;
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bool service_watchdogs;
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ExecOutput default_std_output, default_std_error;
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usec_t default_restart_usec, default_timeout_start_usec, default_timeout_stop_usec;
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usec_t default_timeout_abort_usec;
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bool default_timeout_abort_set;
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usec_t default_start_limit_interval;
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unsigned default_start_limit_burst;
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bool default_cpu_accounting;
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bool default_memory_accounting;
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bool default_io_accounting;
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bool default_blockio_accounting;
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bool default_tasks_accounting;
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bool default_ip_accounting;
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TasksMax default_tasks_max;
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usec_t default_timer_accuracy_usec;
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OOMPolicy default_oom_policy;
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int original_log_level;
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LogTarget original_log_target;
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bool log_level_overridden:1;
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bool log_target_overridden:1;
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struct rlimit *rlimit[_RLIMIT_MAX];
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/* non-zero if we are reloading or reexecuting, */
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int n_reloading;
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unsigned n_installed_jobs;
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unsigned n_failed_jobs;
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/* Jobs in progress watching */
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unsigned n_running_jobs;
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unsigned n_on_console;
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unsigned jobs_in_progress_iteration;
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/* Do we have any outstanding password prompts? */
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int have_ask_password;
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int ask_password_inotify_fd;
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sd_event_source *ask_password_event_source;
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/* Type=idle pipes */
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int idle_pipe[4];
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sd_event_source *idle_pipe_event_source;
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char *switch_root;
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char *switch_root_init;
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/* This maps all possible path prefixes to the units needing
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* them. It's a hashmap with a path string as key and a Set as
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* value where Unit objects are contained. */
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Hashmap *units_requiring_mounts_for;
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/* Used for processing polkit authorization responses */
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Hashmap *polkit_registry;
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/* Dynamic users/groups, indexed by their name */
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Hashmap *dynamic_users;
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/* Keep track of all UIDs and GIDs any of our services currently use. This is useful for the RemoveIPC= logic. */
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Hashmap *uid_refs;
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Hashmap *gid_refs;
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/* ExecRuntime, indexed by their owner unit id */
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Hashmap *exec_runtime_by_id;
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/* When the user hits C-A-D more than 7 times per 2s, do something immediately... */
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RateLimit ctrl_alt_del_ratelimit;
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EmergencyAction cad_burst_action;
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const char *unit_log_field;
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const char *unit_log_format_string;
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const char *invocation_log_field;
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const char *invocation_log_format_string;
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int first_boot; /* tri-state */
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/* Prefixes of e.g. RuntimeDirectory= */
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char *prefix[_EXEC_DIRECTORY_TYPE_MAX];
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/* Used in the SIGCHLD and sd_notify() message invocation logic to avoid that we dispatch the same event
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* multiple times on the same unit. */
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unsigned sigchldgen;
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unsigned notifygen;
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bool honor_device_enumeration;
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VarlinkServer *varlink_server;
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};
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static inline usec_t manager_default_timeout_abort_usec(Manager *m) {
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assert(m);
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return m->default_timeout_abort_set ? m->default_timeout_abort_usec : m->default_timeout_stop_usec;
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}
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#define MANAGER_IS_SYSTEM(m) ((m)->unit_file_scope == UNIT_FILE_SYSTEM)
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#define MANAGER_IS_USER(m) ((m)->unit_file_scope != UNIT_FILE_SYSTEM)
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#define MANAGER_IS_RELOADING(m) ((m)->n_reloading > 0)
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#define MANAGER_IS_FINISHED(m) (dual_timestamp_is_set((m)->timestamps + MANAGER_TIMESTAMP_FINISH))
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/* The objective is set to OK as soon as we enter the main loop, and set otherwise as soon as we are done with it */
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#define MANAGER_IS_RUNNING(m) ((m)->objective == MANAGER_OK)
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#define MANAGER_IS_TEST_RUN(m) ((m)->test_run_flags != 0)
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int manager_new(UnitFileScope scope, ManagerTestRunFlags test_run_flags, Manager **m);
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Manager* manager_free(Manager *m);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
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int manager_startup(Manager *m, FILE *serialization, FDSet *fds);
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Job *manager_get_job(Manager *m, uint32_t id);
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Unit *manager_get_unit(Manager *m, const char *name);
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int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j);
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bool manager_unit_file_maybe_loadable_from_cache(Unit *u);
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int manager_load_unit_prepare(Manager *m, const char *name, const char *path, sd_bus_error *e, Unit **_ret);
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int manager_load_unit(Manager *m, const char *name, const char *path, sd_bus_error *e, Unit **_ret);
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int manager_load_startable_unit_or_warn(Manager *m, const char *name, const char *path, Unit **ret);
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int manager_load_unit_from_dbus_path(Manager *m, const char *s, sd_bus_error *e, Unit **_u);
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int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, Set *affected_jobs, sd_bus_error *e, Job **_ret);
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int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, Set *affected_jobs, sd_bus_error *e, Job **_ret);
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int manager_add_job_by_name_and_warn(Manager *m, JobType type, const char *name, JobMode mode, Set *affected_jobs, Job **ret);
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int manager_propagate_reload(Manager *m, Unit *unit, JobMode mode, sd_bus_error *e);
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void manager_dump_units(Manager *s, FILE *f, const char *prefix);
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void manager_dump_jobs(Manager *s, FILE *f, const char *prefix);
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void manager_dump(Manager *s, FILE *f, const char *prefix);
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int manager_get_dump_string(Manager *m, char **ret);
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void manager_clear_jobs(Manager *m);
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void manager_unwatch_pid(Manager *m, pid_t pid);
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unsigned manager_dispatch_load_queue(Manager *m);
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int manager_default_environment(Manager *m);
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int manager_transient_environment_add(Manager *m, char **plus);
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int manager_client_environment_modify(Manager *m, char **minus, char **plus);
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int manager_get_effective_environment(Manager *m, char ***ret);
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int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit);
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int manager_loop(Manager *m);
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int manager_open_serialization(Manager *m, FILE **_f);
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int manager_serialize(Manager *m, FILE *f, FDSet *fds, bool switching_root);
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int manager_deserialize(Manager *m, FILE *f, FDSet *fds);
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int manager_reload(Manager *m);
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void manager_reset_failed(Manager *m);
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void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success);
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void manager_send_unit_plymouth(Manager *m, Unit *u);
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bool manager_unit_inactive_or_pending(Manager *m, const char *name);
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void manager_check_finished(Manager *m);
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void disable_printk_ratelimit(void);
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void manager_recheck_dbus(Manager *m);
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void manager_recheck_journal(Manager *m);
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bool manager_get_show_status_on(Manager *m);
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void manager_set_show_status(Manager *m, ShowStatus mode, const char *reason);
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void manager_override_show_status(Manager *m, ShowStatus mode, const char *reason);
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void manager_set_first_boot(Manager *m, bool b);
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void manager_status_printf(Manager *m, StatusType type, const char *status, const char *format, ...) _printf_(4,5);
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Set *manager_get_units_requiring_mounts_for(Manager *m, const char *path);
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ManagerState manager_state(Manager *m);
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int manager_update_failed_units(Manager *m, Unit *u, bool failed);
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void manager_unref_uid(Manager *m, uid_t uid, bool destroy_now);
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int manager_ref_uid(Manager *m, uid_t uid, bool clean_ipc);
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void manager_unref_gid(Manager *m, gid_t gid, bool destroy_now);
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int manager_ref_gid(Manager *m, gid_t gid, bool destroy_now);
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char *manager_taint_string(Manager *m);
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void manager_ref_console(Manager *m);
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void manager_unref_console(Manager *m);
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void manager_override_log_level(Manager *m, int level);
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void manager_restore_original_log_level(Manager *m);
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void manager_override_log_target(Manager *m, LogTarget target);
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void manager_restore_original_log_target(Manager *m);
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const char *manager_state_to_string(ManagerState m) _const_;
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ManagerState manager_state_from_string(const char *s) _pure_;
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const char *manager_get_confirm_spawn(Manager *m);
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bool manager_is_confirm_spawn_disabled(Manager *m);
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void manager_disable_confirm_spawn(void);
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const char *manager_timestamp_to_string(ManagerTimestamp m) _const_;
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ManagerTimestamp manager_timestamp_from_string(const char *s) _pure_;
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ManagerTimestamp manager_timestamp_initrd_mangle(ManagerTimestamp s);
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usec_t manager_get_watchdog(Manager *m, WatchdogType t);
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void manager_set_watchdog(Manager *m, WatchdogType t, usec_t timeout);
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int manager_override_watchdog(Manager *m, WatchdogType t, usec_t timeout);
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const char* oom_policy_to_string(OOMPolicy i) _const_;
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OOMPolicy oom_policy_from_string(const char *s) _pure_;
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