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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdbool.h>
+
+#include "macro.h"
+
+/* The enum order is used to order unit jobs in the job queue
+ * when other criteria (cpu weight, nice level) are identical.
+ * In this case service units have the highest priority. */
+typedef enum UnitType {
+ UNIT_SERVICE,
+ UNIT_MOUNT,
+ UNIT_SWAP,
+ UNIT_SOCKET,
+ UNIT_TARGET,
+ UNIT_DEVICE,
+ UNIT_AUTOMOUNT,
+ UNIT_TIMER,
+ UNIT_PATH,
+ UNIT_SLICE,
+ UNIT_SCOPE,
+ _UNIT_TYPE_MAX,
+ _UNIT_TYPE_INVALID = -1
+} UnitType;
+
+typedef enum UnitLoadState {
+ UNIT_STUB,
+ UNIT_LOADED,
+ UNIT_NOT_FOUND, /* error condition #1: unit file not found */
+ UNIT_BAD_SETTING, /* error condition #2: we couldn't parse some essential unit file setting */
+ UNIT_ERROR, /* error condition #3: other "system" error, catchall for the rest */
+ UNIT_MERGED,
+ UNIT_MASKED,
+ _UNIT_LOAD_STATE_MAX,
+ _UNIT_LOAD_STATE_INVALID = -1
+} UnitLoadState;
+
+typedef enum UnitActiveState {
+ UNIT_ACTIVE,
+ UNIT_RELOADING,
+ UNIT_INACTIVE,
+ UNIT_FAILED,
+ UNIT_ACTIVATING,
+ UNIT_DEACTIVATING,
+ UNIT_MAINTENANCE,
+ _UNIT_ACTIVE_STATE_MAX,
+ _UNIT_ACTIVE_STATE_INVALID = -1
+} UnitActiveState;
+
+typedef enum FreezerState {
+ FREEZER_RUNNING,
+ FREEZER_FREEZING,
+ FREEZER_FROZEN,
+ FREEZER_THAWING,
+ _FREEZER_STATE_MAX,
+ _FREEZER_STATE_INVALID = -1
+} FreezerState;
+
+typedef enum AutomountState {
+ AUTOMOUNT_DEAD,
+ AUTOMOUNT_WAITING,
+ AUTOMOUNT_RUNNING,
+ AUTOMOUNT_FAILED,
+ _AUTOMOUNT_STATE_MAX,
+ _AUTOMOUNT_STATE_INVALID = -1
+} AutomountState;
+
+/* We simply watch devices, we cannot plug/unplug them. That
+ * simplifies the state engine greatly */
+typedef enum DeviceState {
+ DEVICE_DEAD,
+ DEVICE_TENTATIVE, /* mounted or swapped, but not (yet) announced by udev */
+ DEVICE_PLUGGED, /* announced by udev */
+ _DEVICE_STATE_MAX,
+ _DEVICE_STATE_INVALID = -1
+} DeviceState;
+
+typedef enum MountState {
+ MOUNT_DEAD,
+ MOUNT_MOUNTING, /* /usr/bin/mount is running, but the mount is not done yet. */
+ MOUNT_MOUNTING_DONE, /* /usr/bin/mount is running, and the mount is done. */
+ MOUNT_MOUNTED,
+ MOUNT_REMOUNTING,
+ MOUNT_UNMOUNTING,
+ MOUNT_REMOUNTING_SIGTERM,
+ MOUNT_REMOUNTING_SIGKILL,
+ MOUNT_UNMOUNTING_SIGTERM,
+ MOUNT_UNMOUNTING_SIGKILL,
+ MOUNT_FAILED,
+ MOUNT_CLEANING,
+ _MOUNT_STATE_MAX,
+ _MOUNT_STATE_INVALID = -1
+} MountState;
+
+typedef enum PathState {
+ PATH_DEAD,
+ PATH_WAITING,
+ PATH_RUNNING,
+ PATH_FAILED,
+ _PATH_STATE_MAX,
+ _PATH_STATE_INVALID = -1
+} PathState;
+
+typedef enum ScopeState {
+ SCOPE_DEAD,
+ SCOPE_RUNNING,
+ SCOPE_ABANDONED,
+ SCOPE_STOP_SIGTERM,
+ SCOPE_STOP_SIGKILL,
+ SCOPE_FAILED,
+ _SCOPE_STATE_MAX,
+ _SCOPE_STATE_INVALID = -1
+} ScopeState;
+
+typedef enum ServiceState {
+ SERVICE_DEAD,
+ SERVICE_CONDITION,
+ SERVICE_START_PRE,
+ SERVICE_START,
+ SERVICE_START_POST,
+ SERVICE_RUNNING,
+ SERVICE_EXITED, /* Nothing is running anymore, but RemainAfterExit is true hence this is OK */
+ SERVICE_RELOAD,
+ SERVICE_STOP, /* No STOP_PRE state, instead just register multiple STOP executables */
+ SERVICE_STOP_WATCHDOG,
+ SERVICE_STOP_SIGTERM,
+ SERVICE_STOP_SIGKILL,
+ SERVICE_STOP_POST,
+ SERVICE_FINAL_WATCHDOG, /* In case the STOP_POST executable needs to be aborted. */
+ SERVICE_FINAL_SIGTERM, /* In case the STOP_POST executable hangs, we shoot that down, too */
+ SERVICE_FINAL_SIGKILL,
+ SERVICE_FAILED,
+ SERVICE_AUTO_RESTART,
+ SERVICE_CLEANING,
+ _SERVICE_STATE_MAX,
+ _SERVICE_STATE_INVALID = -1
+} ServiceState;
+
+typedef enum SliceState {
+ SLICE_DEAD,
+ SLICE_ACTIVE,
+ _SLICE_STATE_MAX,
+ _SLICE_STATE_INVALID = -1
+} SliceState;
+
+typedef enum SocketState {
+ SOCKET_DEAD,
+ SOCKET_START_PRE,
+ SOCKET_START_CHOWN,
+ SOCKET_START_POST,
+ SOCKET_LISTENING,
+ SOCKET_RUNNING,
+ SOCKET_STOP_PRE,
+ SOCKET_STOP_PRE_SIGTERM,
+ SOCKET_STOP_PRE_SIGKILL,
+ SOCKET_STOP_POST,
+ SOCKET_FINAL_SIGTERM,
+ SOCKET_FINAL_SIGKILL,
+ SOCKET_FAILED,
+ SOCKET_CLEANING,
+ _SOCKET_STATE_MAX,
+ _SOCKET_STATE_INVALID = -1
+} SocketState;
+
+typedef enum SwapState {
+ SWAP_DEAD,
+ SWAP_ACTIVATING, /* /sbin/swapon is running, but the swap not yet enabled. */
+ SWAP_ACTIVATING_DONE, /* /sbin/swapon is running, and the swap is done. */
+ SWAP_ACTIVE,
+ SWAP_DEACTIVATING,
+ SWAP_DEACTIVATING_SIGTERM,
+ SWAP_DEACTIVATING_SIGKILL,
+ SWAP_FAILED,
+ SWAP_CLEANING,
+ _SWAP_STATE_MAX,
+ _SWAP_STATE_INVALID = -1
+} SwapState;
+
+typedef enum TargetState {
+ TARGET_DEAD,
+ TARGET_ACTIVE,
+ _TARGET_STATE_MAX,
+ _TARGET_STATE_INVALID = -1
+} TargetState;
+
+typedef enum TimerState {
+ TIMER_DEAD,
+ TIMER_WAITING,
+ TIMER_RUNNING,
+ TIMER_ELAPSED,
+ TIMER_FAILED,
+ _TIMER_STATE_MAX,
+ _TIMER_STATE_INVALID = -1
+} TimerState;
+
+typedef enum UnitDependency {
+ /* Positive dependencies */
+ UNIT_REQUIRES,
+ UNIT_REQUISITE,
+ UNIT_WANTS,
+ UNIT_BINDS_TO,
+ UNIT_PART_OF,
+
+ /* Inverse of the above */
+ UNIT_REQUIRED_BY, /* inverse of 'requires' is 'required_by' */
+ UNIT_REQUISITE_OF, /* inverse of 'requisite' is 'requisite_of' */
+ 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,
+
+ /* Joins namespace of */
+ UNIT_JOINS_NAMESPACE_OF,
+
+ /* Reference information for GC logic */
+ UNIT_REFERENCES, /* Inverse of 'references' is 'referenced_by' */
+ UNIT_REFERENCED_BY,
+
+ _UNIT_DEPENDENCY_MAX,
+ _UNIT_DEPENDENCY_INVALID = -1
+} UnitDependency;
+
+typedef enum NotifyAccess {
+ NOTIFY_NONE,
+ NOTIFY_ALL,
+ NOTIFY_MAIN,
+ NOTIFY_EXEC,
+ _NOTIFY_ACCESS_MAX,
+ _NOTIFY_ACCESS_INVALID = -1
+} NotifyAccess;
+
+char *unit_dbus_path_from_name(const char *name);
+int unit_name_from_dbus_path(const char *path, char **name);
+
+const char* unit_dbus_interface_from_type(UnitType t);
+const char *unit_dbus_interface_from_name(const char *name);
+
+const char *unit_type_to_string(UnitType i) _const_;
+UnitType unit_type_from_string(const char *s) _pure_;
+
+const char *unit_load_state_to_string(UnitLoadState i) _const_;
+UnitLoadState unit_load_state_from_string(const char *s) _pure_;
+
+const char *unit_active_state_to_string(UnitActiveState i) _const_;
+UnitActiveState unit_active_state_from_string(const char *s) _pure_;
+
+const char *freezer_state_to_string(FreezerState i) _const_;
+FreezerState freezer_state_from_string(const char *s) _pure_;
+
+const char* automount_state_to_string(AutomountState i) _const_;
+AutomountState automount_state_from_string(const char *s) _pure_;
+
+const char* device_state_to_string(DeviceState i) _const_;
+DeviceState device_state_from_string(const char *s) _pure_;
+
+const char* mount_state_to_string(MountState i) _const_;
+MountState mount_state_from_string(const char *s) _pure_;
+
+const char* path_state_to_string(PathState i) _const_;
+PathState path_state_from_string(const char *s) _pure_;
+
+const char* scope_state_to_string(ScopeState i) _const_;
+ScopeState scope_state_from_string(const char *s) _pure_;
+
+const char* service_state_to_string(ServiceState i) _const_;
+ServiceState service_state_from_string(const char *s) _pure_;
+
+const char* slice_state_to_string(SliceState i) _const_;
+SliceState slice_state_from_string(const char *s) _pure_;
+
+const char* socket_state_to_string(SocketState i) _const_;
+SocketState socket_state_from_string(const char *s) _pure_;
+
+const char* swap_state_to_string(SwapState i) _const_;
+SwapState swap_state_from_string(const char *s) _pure_;
+
+const char* target_state_to_string(TargetState i) _const_;
+TargetState target_state_from_string(const char *s) _pure_;
+
+const char *timer_state_to_string(TimerState i) _const_;
+TimerState timer_state_from_string(const char *s) _pure_;
+
+const char *unit_dependency_to_string(UnitDependency i) _const_;
+UnitDependency unit_dependency_from_string(const char *s) _pure_;
+
+const char* notify_access_to_string(NotifyAccess i) _const_;
+NotifyAccess notify_access_from_string(const char *s) _pure_;