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 */
  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         } data;
  63 };
  64
  65 #include "unit.h"
  66 #include "job.h"
  67 #include "hashmap.h"
  68 #include "list.h"
  69 #include "set.h"
  70 #include "dbus.h"
  71
  72 #define SPECIAL_DEFAULT_TARGET "default.target"
  73 #define SPECIAL_SYSLOG_SERVICE "syslog.service"
  74 #define SPECIAL_DBUS_SERVICE "messagebus.service"
  75 #define SPECIAL_LOGGER_SOCKET "systemd-logger.socket"
  76 #define SPECIAL_KBREQUEST_TARGET "kbrequest.target"
  77 #define SPECIAL_CTRL_ALT_DEL_TARGET "ctrl-alt-del.target"
  78
  79 struct Manager {
  80         /* In which mode are we running */
  81         ManagerRunningAs running_as;
  82
  83         uint32_t current_job_id;
  84
  85         /* Note that the set of units we know of is allowed to be
  86          * incosistent. However the subset of it that is loaded may
  87          * not, and the list of jobs may neither. */
  88
  89         /* Active jobs and units */
  90         Hashmap *units;  /* name string => Unit object n:1 */
  91         Hashmap *jobs;   /* job id => Job object 1:1 */
  92
  93         /* To make it easy to iterate through the units of a specific
  94          * type we maintain a per type linked list */
  95         LIST_HEAD(Meta, units_per_type[_UNIT_TYPE_MAX]);
  96
  97         /* Units that need to be loaded */
  98         LIST_HEAD(Meta, load_queue); /* this is actually more a stack than a queue, but uh. */
  99
 100         /* Jobs that need to be run */
 101         LIST_HEAD(Job, run_queue);   /* more a stack than a queue, too */
 102
 103         /* Units and jobs that have not yet been announced via
 104          * D-Bus. When something about a job changes it is added here
 105          * if it is not in there yet. This allows easy coalescing of
 106          * D-Bus change signals. */
 107         LIST_HEAD(Meta, dbus_unit_queue);
 108         LIST_HEAD(Job, dbus_job_queue);
 109
 110         /* Jobs to be added */
 111         Hashmap *transaction_jobs;      /* Unit object => Job object list 1:1 */
 112         JobDependency *transaction_anchor;
 113
 114         bool dispatching_load_queue:1;
 115         bool dispatching_run_queue:1;
 116         bool dispatching_dbus_queue:1;
 117
 118         bool request_bus_dispatch:1;
 119
 120         Hashmap *watch_pids;  /* pid => Unit object n:1 */
 121
 122         int epoll_fd;
 123
 124         Watch signal_watch;
 125
 126         char **unit_path;
 127         char **sysvinit_path;
 128
 129         /* Data specific to the device subsystem */
 130         struct udev* udev;
 131         struct udev_monitor* udev_monitor;
 132         Watch udev_watch;
 133
 134         /* Data specific to the mount subsystem */
 135         FILE *proc_self_mountinfo;
 136         Watch mount_watch;
 137
 138         /* Data specific to the D-Bus subsystem */
 139         DBusConnection *bus;
 140         Set *subscribed;
 141 };
 142
 143 Manager* manager_new(void);
 144 void manager_free(Manager *m);
 145
 146 int manager_coldplug(Manager *m);
 147
 148 Job *manager_get_job(Manager *m, uint32_t id);
 149 Unit *manager_get_unit(Manager *m, const char *name);
 150
 151 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u);
 152 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j);
 153
 154 int manager_load_unit(Manager *m, const char *path_or_name, Unit **_ret);
 155 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret);
 156
 157 void manager_dump_units(Manager *s, FILE *f, const char *prefix);
 158 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix);
 159
 160 void manager_transaction_unlink_job(Manager *m, Job *j);
 161
 162 void manager_clear_jobs(Manager *m);
 163
 164 unsigned manager_dispatch_load_queue(Manager *m);
 165 unsigned manager_dispatch_run_queue(Manager *m);
 166 unsigned manager_dispatch_dbus_queue(Manager *m);
 167
 168 int manager_loop(Manager *m);
 169
 170 const char *manager_running_as_to_string(ManagerRunningAs i);
 171 ManagerRunningAs manager_running_as_from_string(const char *s);
 172
 173 #endif