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 "service.h"
  30 #include "kill.h"
  31 #include "exit-status.h"
  32
  33 typedef enum ServiceState {
  34         SERVICE_DEAD,
  35         SERVICE_START_PRE,
  36         SERVICE_START,
  37         SERVICE_START_POST,
  38         SERVICE_RUNNING,
  39         SERVICE_EXITED,            /* Nothing is running anymore, but RemainAfterExit is true hence this is OK */
  40         SERVICE_RELOAD,
  41         SERVICE_STOP,              /* No STOP_PRE state, instead just register multiple STOP executables */
  42         SERVICE_STOP_SIGTERM,
  43         SERVICE_STOP_SIGKILL,
  44         SERVICE_STOP_POST,
  45         SERVICE_FINAL_SIGTERM,     /* In case the STOP_POST executable hangs, we shoot that down, too */
  46         SERVICE_FINAL_SIGKILL,
  47         SERVICE_FAILED,
  48         SERVICE_AUTO_RESTART,
  49         _SERVICE_STATE_MAX,
  50         _SERVICE_STATE_INVALID = -1
  51 } ServiceState;
  52
  53 typedef enum ServiceRestart {
  54         SERVICE_RESTART_NO,
  55         SERVICE_RESTART_ON_SUCCESS,
  56         SERVICE_RESTART_ON_FAILURE,
  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         Watch watchdog_watch;
 133
 134         ExecCommand* exec_command[_SERVICE_EXEC_COMMAND_MAX];
 135
 136         ExecContext exec_context;
 137         KillContext kill_context;
 138
 139         ServiceState state, deserialized_state;
 140
 141         /* The exit status of the real main process */
 142         ExecStatus main_exec_status;
 143
 144         /* The currently executed control process */
 145         ExecCommand *control_command;
 146
 147         /* The currently executed main process, which may be NULL if
 148          * the main process got started via forking mode and not by
 149          * us */
 150         ExecCommand *main_command;
 151
 152         /* The ID of the control command currently being executed */
 153         ServiceExecCommand control_command_id;
 154
 155         pid_t main_pid, control_pid;
 156         int socket_fd;
 157
 158         int fsck_passno;
 159
 160         bool permissions_start_only;
 161         bool root_directory_start_only;
 162         bool remain_after_exit;
 163         bool guess_main_pid;
 164
 165         /* If we shut down, remember why */
 166         ServiceResult result;
 167         ServiceResult reload_result;
 168
 169         bool main_pid_known:1;
 170         bool main_pid_alien:1;
 171         bool bus_name_good:1;
 172         bool forbid_restart:1;
 173         bool got_socket_fd:1;
 174         bool start_timeout_defined:1;
 175 #ifdef HAVE_SYSV_COMPAT
 176         bool is_sysv:1;
 177         bool sysv_has_lsb:1;
 178         bool sysv_enabled:1;
 179         int sysv_start_priority_from_rcnd;
 180         int sysv_start_priority;
 181
 182         char *sysv_runlevels;
 183 #endif
 184
 185         char *bus_name;
 186
 187         char *status_text;
 188
 189         RateLimit start_limit;
 190         StartLimitAction start_limit_action;
 191
 192         UnitRef accept_socket;
 193
 194         Watch timer_watch;
 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);
 207 ServiceState service_state_from_string(const char *s);
 208
 209 const char* service_restart_to_string(ServiceRestart i);
 210 ServiceRestart service_restart_from_string(const char *s);
 211
 212 const char* service_type_to_string(ServiceType i);
 213 ServiceType service_type_from_string(const char *s);
 214
 215 const char* service_exec_command_to_string(ServiceExecCommand i);
 216 ServiceExecCommand service_exec_command_from_string(const char *s);
 217
 218 const char* notify_access_to_string(NotifyAccess i);
 219 NotifyAccess notify_access_from_string(const char *s);
 220
 221 const char* service_result_to_string(ServiceResult i);
 222 ServiceResult service_result_from_string(const char *s);
 223
 224 const char* start_limit_action_to_string(StartLimitAction i);
 225 StartLimitAction start_limit_action_from_string(const char *s);