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 NotifyState {
  95         NOTIFY_UNKNOWN,
  96         NOTIFY_READY,
  97         NOTIFY_RELOADING,
  98         NOTIFY_STOPPING,
  99         _NOTIFY_STATE_MAX,
 100         _NOTIFY_STATE_INVALID = -1
 101 } NotifyState;
 102
 103 typedef enum ServiceResult {
 104         SERVICE_SUCCESS,
 105         SERVICE_FAILURE_RESOURCES,
 106         SERVICE_FAILURE_TIMEOUT,
 107         SERVICE_FAILURE_EXIT_CODE,
 108         SERVICE_FAILURE_SIGNAL,
 109         SERVICE_FAILURE_CORE_DUMP,
 110         SERVICE_FAILURE_WATCHDOG,
 111         SERVICE_FAILURE_START_LIMIT,
 112         _SERVICE_RESULT_MAX,
 113         _SERVICE_RESULT_INVALID = -1
 114 } ServiceResult;
 115
 116 typedef enum FailureAction {
 117         SERVICE_FAILURE_ACTION_NONE,
 118         SERVICE_FAILURE_ACTION_REBOOT,
 119         SERVICE_FAILURE_ACTION_REBOOT_FORCE,
 120         SERVICE_FAILURE_ACTION_REBOOT_IMMEDIATE,
 121         _SERVICE_FAILURE_ACTION_MAX,
 122         _SERVICE_FAILURE_ACTION_INVALID = -1
 123 } FailureAction;
 124
 125 struct Service {
 126         Unit meta;
 127
 128         ServiceType type;
 129         ServiceRestart restart;
 130         ExitStatusSet restart_prevent_status;
 131         ExitStatusSet restart_force_status;
 132         ExitStatusSet success_status;
 133
 134         /* If set we'll read the main daemon PID from this file */
 135         char *pid_file;
 136
 137         usec_t restart_usec;
 138         usec_t timeout_start_usec;
 139         usec_t timeout_stop_usec;
 140
 141         dual_timestamp watchdog_timestamp;
 142         usec_t watchdog_usec;
 143         sd_event_source *watchdog_event_source;
 144
 145         ExecCommand* exec_command[_SERVICE_EXEC_COMMAND_MAX];
 146
 147         ExecContext exec_context;
 148         KillContext kill_context;
 149         CGroupContext cgroup_context;
 150
 151         ServiceState state, deserialized_state;
 152
 153         /* The exit status of the real main process */
 154         ExecStatus main_exec_status;
 155
 156         /* The currently executed control process */
 157         ExecCommand *control_command;
 158
 159         /* The currently executed main process, which may be NULL if
 160          * the main process got started via forking mode and not by
 161          * us */
 162         ExecCommand *main_command;
 163
 164         /* The ID of the control command currently being executed */
 165         ServiceExecCommand control_command_id;
 166
 167         /* Runtime data of the execution context */
 168         ExecRuntime *exec_runtime;
 169
 170         pid_t main_pid, control_pid;
 171         int socket_fd;
 172
 173         bool permissions_start_only;
 174         bool root_directory_start_only;
 175         bool remain_after_exit;
 176         bool guess_main_pid;
 177
 178         /* If we shut down, remember why */
 179         ServiceResult result;
 180         ServiceResult reload_result;
 181
 182         bool main_pid_known:1;
 183         bool main_pid_alien:1;
 184         bool bus_name_good:1;
 185         bool forbid_restart:1;
 186         bool start_timeout_defined:1;
 187 #ifdef HAVE_SYSV_COMPAT
 188         int sysv_start_priority;
 189 #endif
 190
 191         char *bus_name;
 192
 193         char *status_text;
 194         int status_errno;
 195
 196         FailureAction failure_action;
 197
 198         RateLimit start_limit;
 199         FailureAction start_limit_action;
 200         char *reboot_arg;
 201
 202         UnitRef accept_socket;
 203
 204         sd_event_source *timer_event_source;
 205         PathSpec *pid_file_pathspec;
 206
 207         NotifyAccess notify_access;
 208         NotifyState notify_state;
 209 };
 210
 211 extern const UnitVTable service_vtable;
 212
 213 struct Socket;
 214
 215 int service_set_socket_fd(Service *s, int fd, struct Socket *socket);
 216
 217 const char* service_state_to_string(ServiceState i) _const_;
 218 ServiceState service_state_from_string(const char *s) _pure_;
 219
 220 const char* service_restart_to_string(ServiceRestart i) _const_;
 221 ServiceRestart service_restart_from_string(const char *s) _pure_;
 222
 223 const char* service_type_to_string(ServiceType i) _const_;
 224 ServiceType service_type_from_string(const char *s) _pure_;
 225
 226 const char* service_exec_command_to_string(ServiceExecCommand i) _const_;
 227 ServiceExecCommand service_exec_command_from_string(const char *s) _pure_;
 228
 229 const char* notify_access_to_string(NotifyAccess i) _const_;
 230 NotifyAccess notify_access_from_string(const char *s) _pure_;
 231
 232 const char* notify_state_to_string(NotifyState i) _const_;
 233 NotifyState notify_state_from_string(const char *s) _pure_;
 234
 235 const char* service_result_to_string(ServiceResult i) _const_;
 236 ServiceResult service_result_from_string(const char *s) _pure_;
 237
 238 const char* failure_action_to_string(FailureAction i) _const_;
 239 FailureAction failure_action_from_string(const char *s) _pure_;