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 typedef struct ServiceFDStore ServiceFDStore;
  26
  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_SIGABRT,      /* Watchdog timeout */
  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_ABNORMAL,
  58         SERVICE_RESTART_ON_WATCHDOG,
  59         SERVICE_RESTART_ON_ABORT,
  60         SERVICE_RESTART_ALWAYS,
  61         _SERVICE_RESTART_MAX,
  62         _SERVICE_RESTART_INVALID = -1
  63 } ServiceRestart;
  64
  65 typedef enum ServiceType {
  66         SERVICE_SIMPLE,   /* we fork and go on right-away (i.e. modern socket activated daemons) */
  67         SERVICE_FORKING,  /* forks by itself (i.e. traditional daemons) */
  68         SERVICE_ONESHOT,  /* we fork and wait until the program finishes (i.e. programs like fsck which run and need to finish before we continue) */
  69         SERVICE_DBUS,     /* we fork and wait until a specific D-Bus name appears on the bus */
  70         SERVICE_NOTIFY,   /* we fork and wait until a daemon sends us a ready message with sd_notify() */
  71         SERVICE_IDLE,     /* much like simple, but delay exec() until all jobs are dispatched. */
  72         _SERVICE_TYPE_MAX,
  73         _SERVICE_TYPE_INVALID = -1
  74 } ServiceType;
  75
  76 typedef enum ServiceExecCommand {
  77         SERVICE_EXEC_START_PRE,
  78         SERVICE_EXEC_START,
  79         SERVICE_EXEC_START_POST,
  80         SERVICE_EXEC_RELOAD,
  81         SERVICE_EXEC_STOP,
  82         SERVICE_EXEC_STOP_POST,
  83         _SERVICE_EXEC_COMMAND_MAX,
  84         _SERVICE_EXEC_COMMAND_INVALID = -1
  85 } ServiceExecCommand;
  86
  87 typedef enum NotifyAccess {
  88         NOTIFY_NONE,
  89         NOTIFY_ALL,
  90         NOTIFY_MAIN,
  91         _NOTIFY_ACCESS_MAX,
  92         _NOTIFY_ACCESS_INVALID = -1
  93 } NotifyAccess;
  94
  95 typedef enum NotifyState {
  96         NOTIFY_UNKNOWN,
  97         NOTIFY_READY,
  98         NOTIFY_RELOADING,
  99         NOTIFY_STOPPING,
 100         _NOTIFY_STATE_MAX,
 101         _NOTIFY_STATE_INVALID = -1
 102 } NotifyState;
 103
 104 typedef enum ServiceResult {
 105         SERVICE_SUCCESS,
 106         SERVICE_FAILURE_RESOURCES,
 107         SERVICE_FAILURE_TIMEOUT,
 108         SERVICE_FAILURE_EXIT_CODE,
 109         SERVICE_FAILURE_SIGNAL,
 110         SERVICE_FAILURE_CORE_DUMP,
 111         SERVICE_FAILURE_WATCHDOG,
 112         SERVICE_FAILURE_START_LIMIT,
 113         _SERVICE_RESULT_MAX,
 114         _SERVICE_RESULT_INVALID = -1
 115 } ServiceResult;
 116
 117 struct ServiceFDStore {
 118         Service *service;
 119
 120         int fd;
 121         sd_event_source *event_source;
 122
 123         LIST_FIELDS(ServiceFDStore, fd_store);
 124 };
 125
 126 struct Service {
 127         Unit meta;
 128
 129         ServiceType type;
 130         ServiceRestart restart;
 131         ExitStatusSet restart_prevent_status;
 132         ExitStatusSet restart_force_status;
 133         ExitStatusSet success_status;
 134
 135         /* If set we'll read the main daemon PID from this file */
 136         char *pid_file;
 137
 138         usec_t restart_usec;
 139         usec_t timeout_start_usec;
 140         usec_t timeout_stop_usec;
 141
 142         dual_timestamp watchdog_timestamp;
 143         usec_t watchdog_usec;
 144         sd_event_source *watchdog_event_source;
 145
 146         ExecCommand* exec_command[_SERVICE_EXEC_COMMAND_MAX];
 147
 148         ExecContext exec_context;
 149         KillContext kill_context;
 150         CGroupContext cgroup_context;
 151
 152         ServiceState state, deserialized_state;
 153
 154         /* The exit status of the real main process */
 155         ExecStatus main_exec_status;
 156
 157         /* The currently executed control process */
 158         ExecCommand *control_command;
 159
 160         /* The currently executed main process, which may be NULL if
 161          * the main process got started via forking mode and not by
 162          * us */
 163         ExecCommand *main_command;
 164
 165         /* The ID of the control command currently being executed */
 166         ServiceExecCommand control_command_id;
 167
 168         /* Runtime data of the execution context */
 169         ExecRuntime *exec_runtime;
 170
 171         pid_t main_pid, control_pid;
 172         int socket_fd;
 173         bool socket_fd_selinux_context_net;
 174
 175         int bus_endpoint_fd;
 176
 177         bool permissions_start_only;
 178         bool root_directory_start_only;
 179         bool remain_after_exit;
 180         bool guess_main_pid;
 181
 182         /* If we shut down, remember why */
 183         ServiceResult result;
 184         ServiceResult reload_result;
 185
 186         bool main_pid_known:1;
 187         bool main_pid_alien:1;
 188         bool bus_name_good:1;
 189         bool forbid_restart:1;
 190         bool start_timeout_defined:1;
 191
 192         bool reset_cpu_usage:1;
 193
 194         char *bus_name;
 195
 196         char *status_text;
 197         int status_errno;
 198
 199         RateLimit start_limit;
 200         FailureAction start_limit_action;
 201         FailureAction failure_action;
 202         char *reboot_arg;
 203
 204         UnitRef accept_socket;
 205
 206         sd_event_source *timer_event_source;
 207         PathSpec *pid_file_pathspec;
 208
 209         NotifyAccess notify_access;
 210         NotifyState notify_state;
 211
 212         ServiceFDStore *fd_store;
 213         unsigned n_fd_store;
 214         unsigned n_fd_store_max;
 215 };
 216
 217 extern const UnitVTable service_vtable;
 218
 219 struct Socket;
 220
 221 int service_set_socket_fd(Service *s, int fd, struct Socket *socket, bool selinux_context_net);
 222
 223 const char* service_state_to_string(ServiceState i) _const_;
 224 ServiceState service_state_from_string(const char *s) _pure_;
 225
 226 const char* service_restart_to_string(ServiceRestart i) _const_;
 227 ServiceRestart service_restart_from_string(const char *s) _pure_;
 228
 229 const char* service_type_to_string(ServiceType i) _const_;
 230 ServiceType service_type_from_string(const char *s) _pure_;
 231
 232 const char* service_exec_command_to_string(ServiceExecCommand i) _const_;
 233 ServiceExecCommand service_exec_command_from_string(const char *s) _pure_;
 234
 235 const char* notify_access_to_string(NotifyAccess i) _const_;
 236 NotifyAccess notify_access_from_string(const char *s) _pure_;
 237
 238 const char* notify_state_to_string(NotifyState i) _const_;
 239 NotifyState notify_state_from_string(const char *s) _pure_;
 240
 241 const char* service_result_to_string(ServiceResult i) _const_;
 242 ServiceResult service_result_from_string(const char *s) _pure_;