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
  29 #include <dbus/dbus.h>
  30
  31 typedef struct Manager Manager;
  32 typedef enum WatchType WatchType;
  33 typedef struct Watch Watch;
  34
  35 typedef enum ManagerRunningAs {
  36         MANAGER_INIT,      /* root and pid=1 */
  37         MANAGER_SYSTEM,    /* root and pid!=1 */
  38         MANAGER_SESSION,   /* non-root, for a session */
  39         _MANAGER_RUNNING_AS_MAX,
  40         _MANAGER_RUNNING_AS_INVALID = -1
  41 } ManagerRunningAs;
  42
  43 enum WatchType {
  44         WATCH_INVALID,
  45         WATCH_SIGNAL,
  46         WATCH_FD,
  47         WATCH_TIMER,
  48         WATCH_MOUNT,
  49         WATCH_UDEV,
  50         WATCH_DBUS_WATCH,
  51         WATCH_DBUS_TIMEOUT
  52 };
  53
  54 struct Watch {
  55         int fd;
  56         WatchType type;
  57         bool fd_is_dupped;
  58         union {
  59                 union Unit *unit;
  60                 DBusWatch *bus_watch;
  61                 DBusTimeout *bus_timeout;
  62                 bool socket_accept;
  63         } data;
  64 };
  65
  66 #include "unit.h"
  67 #include "job.h"
  68 #include "hashmap.h"
  69 #include "list.h"
  70 #include "set.h"
  71 #include "dbus.h"
  72
  73 #define SPECIAL_DEFAULT_TARGET "default.target"
  74
  75 #define SPECIAL_LOGGER_SOCKET "systemd-logger.socket"
  76
  77 #define SPECIAL_KBREQUEST_TARGET "kbrequest.target"
  78 #define SPECIAL_SIGPWR_TARGET "sigpwr.target"
  79 #define SPECIAL_CTRL_ALT_DEL_TARGET "ctrl-alt-del.target"
  80
  81 #define SPECIAL_LOCAL_FS_TARGET "local-fs.target"
  82 #define SPECIAL_REMOTE_FS_TARGET "remote-fs.target"
  83 #define SPECIAL_NETWORK_TARGET "network.target"
  84 #define SPECIAL_NSS_LOOKUP_TARGET "nss-lookup.target"     /* LSB's $named */
  85 #define SPECIAL_RPCBIND_TARGET "rpcbind.target"           /* LSB's $portmap */
  86 #define SPECIAL_SYSLOG_TARGET "syslog.target"             /* Should pull in syslog.socket or syslog.service */
  87 #define SPECIAL_RTC_SET_TARGET "rtc-set.target"           /* LSB's $time */
  88
  89 #define SPECIAL_BASIC_TARGET "basic.target"
  90 #define SPECIAL_RESCUE_TARGET "rescue.target"
  91
  92 #ifndef SPECIAL_DBUS_SERVICE
  93 #define SPECIAL_DBUS_SERVICE "dbus.service"
  94 #endif
  95
  96 #ifndef SPECIAL_SYSLOG_SERVICE
  97 #define SPECIAL_SYSLOG_SERVICE "syslog.service"
  98 #endif
  99
 100 /* For SysV compatibility. Usually an alias for a saner target. On
 101  * SysV-free systems this doesn't exist. */
 102 #define SPECIAL_RUNLEVEL0_TARGET "runlevel0.target"
 103 #define SPECIAL_RUNLEVEL1_TARGET "runlevel1.target"
 104 #define SPECIAL_RUNLEVEL2_TARGET "runlevel2.target"
 105 #define SPECIAL_RUNLEVEL3_TARGET "runlevel3.target"
 106 #define SPECIAL_RUNLEVEL4_TARGET "runlevel4.target"
 107 #define SPECIAL_RUNLEVEL5_TARGET "runlevel5.target"
 108 #define SPECIAL_RUNLEVEL6_TARGET "runlevel6.target"
 109
 110 struct Manager {
 111         /* In which mode are we running */
 112         ManagerRunningAs running_as;
 113
 114         uint32_t current_job_id;
 115
 116         /* Note that the set of units we know of is allowed to be
 117          * incosistent. However the subset of it that is loaded may
 118          * not, and the list of jobs may neither. */
 119
 120         /* Active jobs and units */
 121         Hashmap *units;  /* name string => Unit object n:1 */
 122         Hashmap *jobs;   /* job id => Job object 1:1 */
 123
 124         /* To make it easy to iterate through the units of a specific
 125          * type we maintain a per type linked list */
 126         LIST_HEAD(Meta, units_per_type[_UNIT_TYPE_MAX]);
 127
 128         /* Units that need to be loaded */
 129         LIST_HEAD(Meta, load_queue); /* this is actually more a stack than a queue, but uh. */
 130
 131         /* Jobs that need to be run */
 132         LIST_HEAD(Job, run_queue);   /* more a stack than a queue, too */
 133
 134         /* Units and jobs that have not yet been announced via
 135          * D-Bus. When something about a job changes it is added here
 136          * if it is not in there yet. This allows easy coalescing of
 137          * D-Bus change signals. */
 138         LIST_HEAD(Meta, dbus_unit_queue);
 139         LIST_HEAD(Job, dbus_job_queue);
 140
 141         LIST_HEAD(Meta, cleanup_queue);
 142
 143         /* Jobs to be added */
 144         Hashmap *transaction_jobs;      /* Unit object => Job object list 1:1 */
 145         JobDependency *transaction_anchor;
 146
 147         bool dispatching_load_queue:1;
 148         bool dispatching_run_queue:1;
 149         bool dispatching_dbus_queue:1;
 150
 151         bool request_api_bus_dispatch:1;
 152         bool request_system_bus_dispatch:1;
 153
 154         bool utmp_reboot_written:1;
 155
 156         bool confirm_spawn:1;
 157
 158         Hashmap *watch_pids;  /* pid => Unit object n:1 */
 159
 160         int epoll_fd;
 161
 162         Watch signal_watch;
 163
 164         char **unit_path;
 165         char **sysvinit_path;
 166         char **sysvrcnd_path;
 167
 168         usec_t boot_timestamp;
 169
 170         /* Data specific to the device subsystem */
 171         struct udev* udev;
 172         struct udev_monitor* udev_monitor;
 173         Watch udev_watch;
 174
 175         /* Data specific to the mount subsystem */
 176         FILE *proc_self_mountinfo;
 177         Watch mount_watch;
 178
 179         /* Data specific to the D-Bus subsystem */
 180         DBusConnection *api_bus, *system_bus;
 181         Set *subscribed;
 182
 183         Hashmap *watch_bus;  /* D-Bus names => Unit object n:1 */
 184         int32_t name_data_slot;
 185
 186         /* Data specific to the cgroup subsystem */
 187         Hashmap *cgroup_bondings; /* path string => CGroupBonding object 1:n */
 188         char *cgroup_controller;
 189         char *cgroup_hierarchy;
 190
 191         /* Data specific to the Automount subsystem */
 192         int dev_autofs_fd;
 193
 194         /* Data specific to the Snapshot subsystem */
 195         unsigned n_snapshots;
 196 };
 197
 198 int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **m);
 199 void manager_free(Manager *m);
 200
 201 int manager_coldplug(Manager *m);
 202
 203 Job *manager_get_job(Manager *m, uint32_t id);
 204 Unit *manager_get_unit(Manager *m, const char *name);
 205
 206 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u);
 207 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j);
 208
 209 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret);
 210
 211 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret);
 212 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool force, Job **_ret);
 213
 214 void manager_dump_units(Manager *s, FILE *f, const char *prefix);
 215 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix);
 216
 217 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies);
 218
 219 void manager_clear_jobs(Manager *m);
 220
 221 unsigned manager_dispatch_load_queue(Manager *m);
 222 unsigned manager_dispatch_run_queue(Manager *m);
 223 unsigned manager_dispatch_dbus_queue(Manager *m);
 224
 225 int manager_loop(Manager *m);
 226
 227 void manager_write_utmp_reboot(Manager *m);
 228 void manager_write_utmp_runlevel(Manager *m, Unit *t);
 229
 230 void manager_dispatch_bus_name_owner_changed(Manager *m, const char *name, const char* old_owner, const char *new_owner);
 231 void manager_dispatch_bus_query_pid_done(Manager *m, const char *name, pid_t pid);
 232
 233 const char *manager_running_as_to_string(ManagerRunningAs i);
 234 ManagerRunningAs manager_running_as_from_string(const char *s);
 235
 236 #endif