src/manager.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   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 /* Enforce upper limit how many names we allow */
  33 #define MANAGER_MAX_NAMES 131072 /* 128K */
  34
  35 typedef struct Manager Manager;
  36 typedef enum WatchType WatchType;
  37 typedef struct Watch Watch;
  38
  39 typedef enum ManagerExitCode {
  40         MANAGER_RUNNING,
  41         MANAGER_EXIT,
  42         MANAGER_RELOAD,
  43         MANAGER_REEXECUTE,
  44         MANAGER_REBOOT,
  45         MANAGER_POWEROFF,
  46         MANAGER_HALT,
  47         MANAGER_KEXEC,
  48         _MANAGER_EXIT_CODE_MAX,
  49         _MANAGER_EXIT_CODE_INVALID = -1
  50 } ManagerExitCode;
  51
  52 typedef enum ManagerRunningAs {
  53         MANAGER_SYSTEM,
  54         MANAGER_USER,
  55         _MANAGER_RUNNING_AS_MAX,
  56         _MANAGER_RUNNING_AS_INVALID = -1
  57 } ManagerRunningAs;
  58
  59 enum WatchType {
  60         WATCH_INVALID,
  61         WATCH_SIGNAL,
  62         WATCH_NOTIFY,
  63         WATCH_FD,
  64         WATCH_UNIT_TIMER,
  65         WATCH_JOB_TIMER,
  66         WATCH_MOUNT,
  67         WATCH_SWAP,
  68         WATCH_UDEV,
  69         WATCH_DBUS_WATCH,
  70         WATCH_DBUS_TIMEOUT
  71 };
  72
  73 struct Watch {
  74         int fd;
  75         WatchType type;
  76         union {
  77                 union Unit *unit;
  78                 struct Job *job;
  79                 DBusWatch *bus_watch;
  80                 DBusTimeout *bus_timeout;
  81         } data;
  82         bool fd_is_dupped:1;
  83         bool socket_accept:1;
  84 };
  85
  86 #include "unit.h"
  87 #include "job.h"
  88 #include "hashmap.h"
  89 #include "list.h"
  90 #include "set.h"
  91 #include "dbus.h"
  92 #include "path-lookup.h"
  93
  94 struct Manager {
  95         /* Note that the set of units we know of is allowed to be
  96          * inconsistent. However the subset of it that is loaded may
  97          * not, and the list of jobs may neither. */
  98
  99         /* Active jobs and units */
 100         Hashmap *units;  /* name string => Unit object n:1 */
 101         Hashmap *jobs;   /* job id => Job object 1:1 */
 102
 103         /* To make it easy to iterate through the units of a specific
 104          * type we maintain a per type linked list */
 105         LIST_HEAD(Meta, units_per_type[_UNIT_TYPE_MAX]);
 106
 107         /* Units that need to be loaded */
 108         LIST_HEAD(Meta, load_queue); /* this is actually more a stack than a queue, but uh. */
 109
 110         /* Jobs that need to be run */
 111         LIST_HEAD(Job, run_queue);   /* more a stack than a queue, too */
 112
 113         /* Units and jobs that have not yet been announced via
 114          * D-Bus. When something about a job changes it is added here
 115          * if it is not in there yet. This allows easy coalescing of
 116          * D-Bus change signals. */
 117         LIST_HEAD(Meta, dbus_unit_queue);
 118         LIST_HEAD(Job, dbus_job_queue);
 119
 120         /* Units to remove */
 121         LIST_HEAD(Meta, cleanup_queue);
 122
 123         /* Units to check when doing GC */
 124         LIST_HEAD(Meta, gc_queue);
 125
 126         /* Jobs to be added */
 127         Hashmap *transaction_jobs;      /* Unit object => Job object list 1:1 */
 128         JobDependency *transaction_anchor;
 129
 130         Hashmap *watch_pids;  /* pid => Unit object n:1 */
 131
 132         char *notify_socket;
 133
 134         Watch notify_watch;
 135         Watch signal_watch;
 136
 137         int epoll_fd;
 138
 139         unsigned n_snapshots;
 140
 141         LookupPaths lookup_paths;
 142         Set *unit_path_cache;
 143
 144         char **environment;
 145         char **default_controllers;
 146
 147         dual_timestamp initrd_timestamp;
 148         dual_timestamp startup_timestamp;
 149         dual_timestamp finish_timestamp;
 150
 151         char *generator_unit_path;
 152
 153         /* Data specific to the device subsystem */
 154         struct udev* udev;
 155         struct udev_monitor* udev_monitor;
 156         Watch udev_watch;
 157         Hashmap *devices_by_sysfs;
 158
 159         /* Data specific to the mount subsystem */
 160         FILE *proc_self_mountinfo;
 161         Watch mount_watch;
 162
 163         /* Data specific to the swap filesystem */
 164         FILE *proc_swaps;
 165         Hashmap *swaps_by_proc_swaps;
 166         bool request_reload;
 167         Watch swap_watch;
 168
 169         /* Data specific to the D-Bus subsystem */
 170         DBusConnection *api_bus, *system_bus;
 171         DBusServer *private_bus;
 172         Set *bus_connections, *bus_connections_for_dispatch;
 173
 174         DBusMessage *queued_message; /* This is used during reloading:
 175                                       * before the reload we queue the
 176                                       * reply message here, and
 177                                       * afterwards we send it */
 178         DBusConnection *queued_message_connection; /* The connection to send the queued message on */
 179
 180         Hashmap *watch_bus;  /* D-Bus names => Unit object n:1 */
 181         int32_t name_data_slot;
 182         int32_t subscribed_data_slot;
 183
 184         uint32_t current_job_id;
 185
 186         /* Data specific to the Automount subsystem */
 187         int dev_autofs_fd;
 188
 189         /* Data specific to the cgroup subsystem */
 190         Hashmap *cgroup_bondings; /* path string => CGroupBonding object 1:n */
 191         char *cgroup_hierarchy;
 192
 193         usec_t gc_queue_timestamp;
 194         int gc_marker;
 195         unsigned n_in_gc_queue;
 196
 197         /* Make sure the user cannot accidentally unmount our cgroup
 198          * file system */
 199         int pin_cgroupfs_fd;
 200
 201         /* Audit fd */
 202 #ifdef HAVE_AUDIT
 203         int audit_fd;
 204 #endif
 205
 206         /* Flags */
 207         ManagerRunningAs running_as;
 208         ManagerExitCode exit_code:5;
 209
 210         bool dispatching_load_queue:1;
 211         bool dispatching_run_queue:1;
 212         bool dispatching_dbus_queue:1;
 213
 214         bool taint_usr:1;
 215
 216         bool show_status;
 217         bool confirm_spawn;
 218 #ifdef HAVE_SYSV_COMPAT
 219         bool sysv_console;
 220 #endif
 221         bool mount_auto;
 222         bool swap_auto;
 223
 224         ExecOutput default_std_output, default_std_error;
 225
 226         int n_serializing;
 227         int n_deserializing;
 228
 229         unsigned n_installed_jobs;
 230         unsigned n_failed_jobs;
 231 };
 232
 233 int manager_new(ManagerRunningAs running_as, Manager **m);
 234 void manager_free(Manager *m);
 235
 236 int manager_enumerate(Manager *m);
 237 int manager_coldplug(Manager *m);
 238 int manager_startup(Manager *m, FILE *serialization, FDSet *fds);
 239
 240 Job *manager_get_job(Manager *m, uint32_t id);
 241 Unit *manager_get_unit(Manager *m, const char *name);
 242
 243 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u);
 244 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j);
 245
 246 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret);
 247 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret);
 248
 249 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, DBusError *e, Job **_ret);
 250 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool force, DBusError *e, Job **_ret);
 251
 252 void manager_dump_units(Manager *s, FILE *f, const char *prefix);
 253 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix);
 254
 255 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies);
 256
 257 void manager_clear_jobs(Manager *m);
 258
 259 unsigned manager_dispatch_load_queue(Manager *m);
 260 unsigned manager_dispatch_run_queue(Manager *m);
 261 unsigned manager_dispatch_dbus_queue(Manager *m);
 262
 263 int manager_set_default_controllers(Manager *m, char **controllers);
 264
 265 int manager_loop(Manager *m);
 266
 267 void manager_dispatch_bus_name_owner_changed(Manager *m, const char *name, const char* old_owner, const char *new_owner);
 268 void manager_dispatch_bus_query_pid_done(Manager *m, const char *name, pid_t pid);
 269
 270 int manager_open_serialization(Manager *m, FILE **_f);
 271
 272 int manager_serialize(Manager *m, FILE *f, FDSet *fds);
 273 int manager_deserialize(Manager *m, FILE *f, FDSet *fds);
 274
 275 int manager_reload(Manager *m);
 276
 277 bool manager_is_booting_or_shutting_down(Manager *m);
 278
 279 void manager_reset_failed(Manager *m);
 280
 281 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success);
 282 void manager_send_unit_plymouth(Manager *m, Unit *u);
 283
 284 bool manager_unit_pending_inactive(Manager *m, const char *name);
 285
 286 void manager_check_finished(Manager *m);
 287
 288 void manager_run_generators(Manager *m);
 289 void manager_undo_generators(Manager *m);
 290
 291 void manager_recheck_syslog(Manager *m);
 292
 293 const char *manager_running_as_to_string(ManagerRunningAs i);
 294 ManagerRunningAs manager_running_as_from_string(const char *s);
 295
 296 #endif