src/core/service.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 typedef struct Service Service;
  25
  26 #include "unit.h"
  27 #include "path.h"
  28 #include "ratelimit.h"
  29 #include "kill.h"
  30 #include "exit-status.h"
  31
  32 typedef enum ServiceState {
  33         SERVICE_DEAD,
  34         SERVICE_START_PRE,
  35         SERVICE_START,
  36         SERVICE_START_POST,
  37         SERVICE_RUNNING,
  38         SERVICE_EXITED,            /* Nothing is running anymore, but RemainAfterExit is true hence this is OK */
  39         SERVICE_RELOAD,
  40         SERVICE_STOP,              /* No STOP_PRE state, instead just register multiple STOP executables */
  41         SERVICE_STOP_SIGTERM,
  42         SERVICE_STOP_SIGKILL,
  43         SERVICE_STOP_POST,
  44         SERVICE_FINAL_SIGTERM,     /* In case the STOP_POST executable hangs, we shoot that down, too */
  45         SERVICE_FINAL_SIGKILL,
  46         SERVICE_FAILED,
  47         SERVICE_AUTO_RESTART,
  48         _SERVICE_STATE_MAX,
  49         _SERVICE_STATE_INVALID = -1
  50 } ServiceState;
  51
  52 typedef enum ServiceRestart {
  53         SERVICE_RESTART_NO,
  54         SERVICE_RESTART_ON_SUCCESS,
  55         SERVICE_RESTART_ON_FAILURE,
  56         SERVICE_RESTART_ON_WATCHDOG,
  57         SERVICE_RESTART_ON_ABORT,
  58         SERVICE_RESTART_ALWAYS,
  59         _SERVICE_RESTART_MAX,
  60         _SERVICE_RESTART_INVALID = -1
  61 } ServiceRestart;
  62
  63 typedef enum ServiceType {
  64         SERVICE_SIMPLE,   /* we fork and go on right-away (i.e. modern socket activated daemons) */
  65         SERVICE_FORKING,  /* forks by itself (i.e. traditional daemons) */
  66         SERVICE_ONESHOT,  /* we fork and wait until the program finishes (i.e. programs like fsck which run and need to finish before we continue) */
  67         SERVICE_DBUS,     /* we fork and wait until a specific D-Bus name appears on the bus */
  68         SERVICE_NOTIFY,   /* we fork and wait until a daemon sends us a ready message with sd_notify() */
  69         SERVICE_IDLE,     /* much like simple, but delay exec() until all jobs are dispatched. */
  70         _SERVICE_TYPE_MAX,
  71         _SERVICE_TYPE_INVALID = -1
  72 } ServiceType;
  73
  74 typedef enum ServiceExecCommand {
  75         SERVICE_EXEC_START_PRE,
  76         SERVICE_EXEC_START,
  77         SERVICE_EXEC_START_POST,
  78         SERVICE_EXEC_RELOAD,
  79         SERVICE_EXEC_STOP,
  80         SERVICE_EXEC_STOP_POST,
  81         _SERVICE_EXEC_COMMAND_MAX,
  82         _SERVICE_EXEC_COMMAND_INVALID = -1
  83 } ServiceExecCommand;
  84
  85 typedef enum NotifyAccess {
  86         NOTIFY_NONE,
  87         NOTIFY_ALL,
  88         NOTIFY_MAIN,
  89         _NOTIFY_ACCESS_MAX,
  90         _NOTIFY_ACCESS_INVALID = -1
  91 } NotifyAccess;
  92
  93 typedef enum ServiceResult {
  94         SERVICE_SUCCESS,
  95         SERVICE_FAILURE_RESOURCES,
  96         SERVICE_FAILURE_TIMEOUT,
  97         SERVICE_FAILURE_EXIT_CODE,
  98         SERVICE_FAILURE_SIGNAL,
  99         SERVICE_FAILURE_CORE_DUMP,
 100         SERVICE_FAILURE_WATCHDOG,
 101         SERVICE_FAILURE_START_LIMIT,
 102         _SERVICE_RESULT_MAX,
 103         _SERVICE_RESULT_INVALID = -1
 104 } ServiceResult;
 105
 106 typedef enum StartLimitAction {
 107         SERVICE_START_LIMIT_NONE,
 108         SERVICE_START_LIMIT_REBOOT,
 109         SERVICE_START_LIMIT_REBOOT_FORCE,
 110         SERVICE_START_LIMIT_REBOOT_IMMEDIATE,
 111         _SERVICE_START_LIMIT_MAX,
 112         _SERVICE_START_LIMIT_INVALID = -1
 113 } StartLimitAction;
 114
 115 struct Service {
 116         Unit meta;
 117
 118         ServiceType type;
 119         ServiceRestart restart;
 120         ExitStatusSet restart_ignore_status;
 121         ExitStatusSet success_status;
 122
 123         /* If set we'll read the main daemon PID from this file */
 124         char *pid_file;
 125
 126         usec_t restart_usec;
 127         usec_t timeout_start_usec;
 128         usec_t timeout_stop_usec;
 129
 130         dual_timestamp watchdog_timestamp;
 131         usec_t watchdog_usec;
 132         sd_event_source *watchdog_event_source;
 133
 134         ExecCommand* exec_command[_SERVICE_EXEC_COMMAND_MAX];
 135
 136         ExecContext exec_context;
 137         KillContext kill_context;
 138         CGroupContext cgroup_context;
 139
 140         ServiceState state, deserialized_state;
 141
 142         /* The exit status of the real main process */
 143         ExecStatus main_exec_status;
 144
 145         /* The currently executed control process */
 146         ExecCommand *control_command;
 147
 148         /* The currently executed main process, which may be NULL if
 149          * the main process got started via forking mode and not by
 150          * us */
 151         ExecCommand *main_command;
 152
 153         /* The ID of the control command currently being executed */
 154         ServiceExecCommand control_command_id;
 155
 156         /* Runtime data of the execution context */
 157         ExecRuntime *exec_runtime;
 158
 159         pid_t main_pid, control_pid;
 160         int socket_fd;
 161
 162         bool permissions_start_only;
 163         bool root_directory_start_only;
 164         bool remain_after_exit;
 165         bool guess_main_pid;
 166
 167         /* If we shut down, remember why */
 168         ServiceResult result;
 169         ServiceResult reload_result;
 170
 171         bool main_pid_known:1;
 172         bool main_pid_alien:1;
 173         bool bus_name_good:1;
 174         bool forbid_restart:1;
 175         bool start_timeout_defined:1;
 176 #ifdef HAVE_SYSV_COMPAT
 177         bool is_sysv:1;
 178         bool sysv_has_lsb:1;
 179         bool sysv_enabled:1;
 180         int sysv_start_priority_from_rcnd;
 181         int sysv_start_priority;
 182
 183         char *sysv_runlevels;
 184 #endif
 185
 186         char *bus_name;
 187
 188         char *status_text;
 189
 190         RateLimit start_limit;
 191         StartLimitAction start_limit_action;
 192         char *reboot_arg;
 193
 194         UnitRef accept_socket;
 195
 196         sd_event_source *timer_event_source;
 197         PathSpec *pid_file_pathspec;
 198
 199         NotifyAccess notify_access;
 200 };
 201
 202 extern const UnitVTable service_vtable;
 203
 204 struct Socket;
 205
 206 int service_set_socket_fd(Service *s, int fd, struct Socket *socket);
 207
 208 const char* service_state_to_string(ServiceState i) _const_;
 209 ServiceState service_state_from_string(const char *s) _pure_;
 210
 211 const char* service_restart_to_string(ServiceRestart i) _const_;
 212 ServiceRestart service_restart_from_string(const char *s) _pure_;
 213
 214 const char* service_type_to_string(ServiceType i) _const_;
 215 ServiceType service_type_from_string(const char *s) _pure_;
 216
 217 const char* service_exec_command_to_string(ServiceExecCommand i) _const_;
 218 ServiceExecCommand service_exec_command_from_string(const char *s) _pure_;
 219
 220 const char* notify_access_to_string(NotifyAccess i) _const_;
 221 NotifyAccess notify_access_from_string(const char *s) _pure_;
 222
 223 const char* service_result_to_string(ServiceResult i) _const_;
 224 ServiceResult service_result_from_string(const char *s) _pure_;
 225
 226 const char* start_limit_action_to_string(StartLimitAction i) _const_;
 227 StartLimitAction start_limit_action_from_string(const char *s) _pure_;