manager.h

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #ifndef foomanagerhfoo
   4 #define foomanagerhfoo
   5
   6 /***
   7   This file is part of systemd.
   8
   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU General Public License as published by
  13   the Free Software Foundation; either version 2 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 ***/
  24
  25 #include <stdbool.h>
  26 #include <inttypes.h>
  27 #include <stdio.h>
  28 #include <dbus/dbus.h>
  29
  30 #include "fdset.h"
  31
  32 typedef struct Manager Manager;
  33 typedef enum WatchType WatchType;
  34 typedef struct Watch Watch;
  35
  36 typedef enum ManagerExitCode {
  37         MANAGER_RUNNING,
  38         MANAGER_EXIT,
  39         MANAGER_RELOAD,
  40         MANAGER_REEXECUTE,
  41         _MANAGER_EXIT_CODE_MAX,
  42         _MANAGER_EXIT_CODE_INVALID = -1
  43 } ManagerExitCode;
  44
  45 typedef enum ManagerRunningAs {
  46         MANAGER_INIT,      /* root and pid=1 */
  47         MANAGER_SYSTEM,    /* root and pid!=1 */
  48         MANAGER_SESSION,   /* non-root, for a session */
  49         _MANAGER_RUNNING_AS_MAX,
  50         _MANAGER_RUNNING_AS_INVALID = -1
  51 } ManagerRunningAs;
  52
  53 enum WatchType {
  54         WATCH_INVALID,
  55         WATCH_SIGNAL,
  56         WATCH_FD,
  57         WATCH_TIMER,
  58         WATCH_MOUNT,
  59         WATCH_UDEV,
  60         WATCH_DBUS_WATCH,
  61         WATCH_DBUS_TIMEOUT
  62 };
  63
  64 struct Watch {
  65         int fd;
  66         WatchType type;
  67         bool fd_is_dupped;
  68         union {
  69                 union Unit *unit;
  70                 DBusWatch *bus_watch;
  71                 DBusTimeout *bus_timeout;
  72                 bool socket_accept;
  73         } data;
  74 };
  75
  76 #include "unit.h"
  77 #include "job.h"
  78 #include "hashmap.h"
  79 #include "list.h"
  80 #include "set.h"
  81 #include "dbus.h"
  82
  83 #define SPECIAL_DEFAULT_TARGET "default.target"
  84
  85 #define SPECIAL_LOGGER_SOCKET "systemd-logger.socket"
  86
  87 #define SPECIAL_KBREQUEST_TARGET "kbrequest.target"
  88 #define SPECIAL_SIGPWR_TARGET "sigpwr.target"
  89 #define SPECIAL_CTRL_ALT_DEL_TARGET "ctrl-alt-del.target"
  90
  91 #define SPECIAL_LOCAL_FS_TARGET "local-fs.target"
  92 #define SPECIAL_REMOTE_FS_TARGET "remote-fs.target"
  93 #define SPECIAL_NETWORK_TARGET "network.target"
  94 #define SPECIAL_NSS_LOOKUP_TARGET "nss-lookup.target"     /* LSB's $named */
  95 #define SPECIAL_RPCBIND_TARGET "rpcbind.target"           /* LSB's $portmap */
  96 #define SPECIAL_SYSLOG_TARGET "syslog.target"             /* Should pull in syslog.socket or syslog.service */
  97 #define SPECIAL_RTC_SET_TARGET "rtc-set.target"           /* LSB's $time */
  98
  99 #define SPECIAL_BASIC_TARGET "basic.target"
 100 #define SPECIAL_RESCUE_TARGET "rescue.target"
 101
 102 #ifndef SPECIAL_DBUS_SERVICE
 103 #define SPECIAL_DBUS_SERVICE "dbus.service"
 104 #endif
 105
 106 #ifndef SPECIAL_SYSLOG_SERVICE
 107 #define SPECIAL_SYSLOG_SERVICE "syslog.service"
 108 #endif
 109
 110 /* For SysV compatibility. Usually an alias for a saner target. On
 111  * SysV-free systems this doesn't exist. */
 112 #define SPECIAL_RUNLEVEL0_TARGET "runlevel0.target"
 113 #define SPECIAL_RUNLEVEL1_TARGET "runlevel1.target"
 114 #define SPECIAL_RUNLEVEL2_TARGET "runlevel2.target"
 115 #define SPECIAL_RUNLEVEL3_TARGET "runlevel3.target"
 116 #define SPECIAL_RUNLEVEL4_TARGET "runlevel4.target"
 117 #define SPECIAL_RUNLEVEL5_TARGET "runlevel5.target"
 118 #define SPECIAL_RUNLEVEL6_TARGET "runlevel6.target"
 119
 120 struct Manager {
 121         /* In which mode are we running */
 122         ManagerRunningAs running_as;
 123
 124         uint32_t current_job_id;
 125
 126         /* Note that the set of units we know of is allowed to be
 127          * incosistent. However the subset of it that is loaded may
 128          * not, and the list of jobs may neither. */
 129
 130         /* Active jobs and units */
 131         Hashmap *units;  /* name string => Unit object n:1 */
 132         Hashmap *jobs;   /* job id => Job object 1:1 */
 133
 134         /* To make it easy to iterate through the units of a specific
 135          * type we maintain a per type linked list */
 136         LIST_HEAD(Meta, units_per_type[_UNIT_TYPE_MAX]);
 137
 138         /* Units that need to be loaded */
 139         LIST_HEAD(Meta, load_queue); /* this is actually more a stack than a queue, but uh. */
 140
 141         /* Jobs that need to be run */
 142         LIST_HEAD(Job, run_queue);   /* more a stack than a queue, too */
 143
 144         /* Units and jobs that have not yet been announced via
 145          * D-Bus. When something about a job changes it is added here
 146          * if it is not in there yet. This allows easy coalescing of
 147          * D-Bus change signals. */
 148         LIST_HEAD(Meta, dbus_unit_queue);
 149         LIST_HEAD(Job, dbus_job_queue);
 150
 151         LIST_HEAD(Meta, cleanup_queue);
 152
 153         /* Jobs to be added */
 154         Hashmap *transaction_jobs;      /* Unit object => Job object list 1:1 */
 155         JobDependency *transaction_anchor;
 156
 157         bool dispatching_load_queue:1;
 158         bool dispatching_run_queue:1;
 159         bool dispatching_dbus_queue:1;
 160
 161         bool request_api_bus_dispatch:1;
 162         bool request_system_bus_dispatch:1;
 163
 164         bool utmp_reboot_written:1;
 165
 166         bool confirm_spawn:1;
 167
 168         ManagerExitCode exit_code;
 169
 170         Hashmap *watch_pids;  /* pid => Unit object n:1 */
 171
 172         int epoll_fd;
 173
 174         Watch signal_watch;
 175
 176         char **unit_path;
 177         char **sysvinit_path;
 178         char **sysvrcnd_path;
 179
 180         usec_t boot_timestamp;
 181
 182         /* Data specific to the device subsystem */
 183         struct udev* udev;
 184         struct udev_monitor* udev_monitor;
 185         Watch udev_watch;
 186
 187         /* Data specific to the mount subsystem */
 188         FILE *proc_self_mountinfo;
 189         Watch mount_watch;
 190
 191         /* Data specific to the D-Bus subsystem */
 192         DBusConnection *api_bus, *system_bus;
 193         Set *subscribed;
 194         DBusMessage *queued_message; /* This is used during reloading:
 195                                       * before the reload we queue the
 196                                       * reply message here, and
 197                                       * afterwards we send it */
 198
 199         Hashmap *watch_bus;  /* D-Bus names => Unit object n:1 */
 200         int32_t name_data_slot;
 201
 202         /* Data specific to the cgroup subsystem */
 203         Hashmap *cgroup_bondings; /* path string => CGroupBonding object 1:n */
 204         char *cgroup_controller;
 205         char *cgroup_hierarchy;
 206
 207         /* Data specific to the Automount subsystem */
 208         int dev_autofs_fd;
 209
 210         /* Data specific to the Snapshot subsystem */
 211         unsigned n_snapshots;
 212 };
 213
 214 int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **m);
 215 void manager_free(Manager *m);
 216
 217 int manager_enumerate(Manager *m);
 218 int manager_coldplug(Manager *m);
 219 int manager_startup(Manager *m, FILE *serialization, FDSet *fds);
 220
 221 Job *manager_get_job(Manager *m, uint32_t id);
 222 Unit *manager_get_unit(Manager *m, const char *name);
 223
 224 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u);
 225 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j);
 226
 227 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret);
 228
 229 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret);
 230 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool force, Job **_ret);
 231
 232 void manager_dump_units(Manager *s, FILE *f, const char *prefix);
 233 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix);
 234
 235 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies);
 236
 237 void manager_clear_jobs(Manager *m);
 238
 239 unsigned manager_dispatch_load_queue(Manager *m);
 240 unsigned manager_dispatch_run_queue(Manager *m);
 241 unsigned manager_dispatch_dbus_queue(Manager *m);
 242
 243 int manager_loop(Manager *m);
 244
 245 void manager_write_utmp_reboot(Manager *m);
 246 void manager_write_utmp_runlevel(Manager *m, Unit *t);
 247
 248 void manager_dispatch_bus_name_owner_changed(Manager *m, const char *name, const char* old_owner, const char *new_owner);
 249 void manager_dispatch_bus_query_pid_done(Manager *m, const char *name, pid_t pid);
 250
 251 int manager_open_serialization(FILE **_f);
 252
 253 int manager_serialize(Manager *m, FILE *f, FDSet *fds);
 254 int manager_deserialize(Manager *m, FILE *f, FDSet *fds);
 255
 256 int manager_reload(Manager *m);
 257
 258 const char *manager_running_as_to_string(ManagerRunningAs i);
 259 ManagerRunningAs manager_running_as_from_string(const char *s);
 260
 261 #endif