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_ABNORMAL,
  57         SERVICE_RESTART_ON_WATCHDOG,
  58         SERVICE_RESTART_ON_ABORT,
  59         SERVICE_RESTART_ALWAYS,
  60         _SERVICE_RESTART_MAX,
  61         _SERVICE_RESTART_INVALID = -1
  62 } ServiceRestart;
  63
  64 typedef enum ServiceType {
  65         SERVICE_SIMPLE,   /* we fork and go on right-away (i.e. modern socket activated daemons) */
  66         SERVICE_FORKING,  /* forks by itself (i.e. traditional daemons) */
  67         SERVICE_ONESHOT,  /* we fork and wait until the program finishes (i.e. programs like fsck which run and need to finish before we continue) */
  68         SERVICE_DBUS,     /* we fork and wait until a specific D-Bus name appears on the bus */
  69         SERVICE_NOTIFY,   /* we fork and wait until a daemon sends us a ready message with sd_notify() */
  70         SERVICE_IDLE,     /* much like simple, but delay exec() until all jobs are dispatched. */
  71         _SERVICE_TYPE_MAX,
  72         _SERVICE_TYPE_INVALID = -1
  73 } ServiceType;
  74
  75 typedef enum ServiceExecCommand {
  76         SERVICE_EXEC_START_PRE,
  77         SERVICE_EXEC_START,
  78         SERVICE_EXEC_START_POST,
  79         SERVICE_EXEC_RELOAD,
  80         SERVICE_EXEC_STOP,
  81         SERVICE_EXEC_STOP_POST,
  82         _SERVICE_EXEC_COMMAND_MAX,
  83         _SERVICE_EXEC_COMMAND_INVALID = -1
  84 } ServiceExecCommand;
  85
  86 typedef enum NotifyAccess {
  87         NOTIFY_NONE,
  88         NOTIFY_ALL,
  89         NOTIFY_MAIN,
  90         _NOTIFY_ACCESS_MAX,
  91         _NOTIFY_ACCESS_INVALID = -1
  92 } NotifyAccess;
  93
  94 typedef enum ServiceResult {
  95         SERVICE_SUCCESS,
  96         SERVICE_FAILURE_RESOURCES,
  97         SERVICE_FAILURE_TIMEOUT,
  98         SERVICE_FAILURE_EXIT_CODE,
  99         SERVICE_FAILURE_SIGNAL,
 100         SERVICE_FAILURE_CORE_DUMP,
 101         SERVICE_FAILURE_WATCHDOG,
 102         SERVICE_FAILURE_START_LIMIT,
 103         _SERVICE_RESULT_MAX,
 104         _SERVICE_RESULT_INVALID = -1
 105 } ServiceResult;
 106
 107 typedef enum FailureAction {
 108         SERVICE_FAILURE_ACTION_NONE,
 109         SERVICE_FAILURE_ACTION_REBOOT,
 110         SERVICE_FAILURE_ACTION_REBOOT_FORCE,
 111         SERVICE_FAILURE_ACTION_REBOOT_IMMEDIATE,
 112         _SERVICE_FAILURE_ACTION_MAX,
 113         _SERVICE_FAILURE_ACTION_INVALID = -1
 114 } FailureAction;
 115
 116 struct Service {
 117         Unit meta;
 118
 119         ServiceType type;
 120         ServiceRestart restart;
 121         ExitStatusSet restart_prevent_status;
 122         ExitStatusSet restart_force_status;
 123         ExitStatusSet success_status;
 124
 125         /* If set we'll read the main daemon PID from this file */
 126         char *pid_file;
 127
 128         usec_t restart_usec;
 129         usec_t timeout_start_usec;
 130         usec_t timeout_stop_usec;
 131
 132         dual_timestamp watchdog_timestamp;
 133         usec_t watchdog_usec;
 134         sd_event_source *watchdog_event_source;
 135
 136         ExecCommand* exec_command[_SERVICE_EXEC_COMMAND_MAX];
 137
 138         ExecContext exec_context;
 139         KillContext kill_context;
 140         CGroupContext cgroup_context;
 141
 142         ServiceState state, deserialized_state;
 143
 144         /* The exit status of the real main process */
 145         ExecStatus main_exec_status;
 146
 147         /* The currently executed control process */
 148         ExecCommand *control_command;
 149
 150         /* The currently executed main process, which may be NULL if
 151          * the main process got started via forking mode and not by
 152          * us */
 153         ExecCommand *main_command;
 154
 155         /* The ID of the control command currently being executed */
 156         ServiceExecCommand control_command_id;
 157
 158         /* Runtime data of the execution context */
 159         ExecRuntime *exec_runtime;
 160
 161         pid_t main_pid, control_pid;
 162         int socket_fd;
 163
 164         bool permissions_start_only;
 165         bool root_directory_start_only;
 166         bool remain_after_exit;
 167         bool guess_main_pid;
 168
 169         /* If we shut down, remember why */
 170         ServiceResult result;
 171         ServiceResult reload_result;
 172
 173         bool main_pid_known:1;
 174         bool main_pid_alien:1;
 175         bool bus_name_good:1;
 176         bool forbid_restart:1;
 177         bool start_timeout_defined:1;
 178 #ifdef HAVE_SYSV_COMPAT
 179         int sysv_start_priority;
 180 #endif
 181
 182         char *bus_name;
 183
 184         char *status_text;
 185
 186         FailureAction failure_action;
 187
 188         RateLimit start_limit;
 189         FailureAction start_limit_action;
 190         char *reboot_arg;
 191
 192         UnitRef accept_socket;
 193
 194         sd_event_source *timer_event_source;
 195         PathSpec *pid_file_pathspec;
 196
 197         NotifyAccess notify_access;
 198 };
 199
 200 extern const UnitVTable service_vtable;
 201
 202 struct Socket;
 203
 204 int service_set_socket_fd(Service *s, int fd, struct Socket *socket);
 205
 206 const char* service_state_to_string(ServiceState i) _const_;
 207 ServiceState service_state_from_string(const char *s) _pure_;
 208
 209 const char* service_restart_to_string(ServiceRestart i) _const_;
 210 ServiceRestart service_restart_from_string(const char *s) _pure_;
 211
 212 const char* service_type_to_string(ServiceType i) _const_;
 213 ServiceType service_type_from_string(const char *s) _pure_;
 214
 215 const char* service_exec_command_to_string(ServiceExecCommand i) _const_;
 216 ServiceExecCommand service_exec_command_from_string(const char *s) _pure_;
 217
 218 const char* notify_access_to_string(NotifyAccess i) _const_;
 219 NotifyAccess notify_access_from_string(const char *s) _pure_;
 220
 221 const char* service_result_to_string(ServiceResult i) _const_;
 222 ServiceResult service_result_from_string(const char *s) _pure_;
 223
 224 const char* failure_action_to_string(FailureAction i) _const_;
 225 FailureAction failure_action_from_string(const char *s) _pure_;