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Systemd/manager.h

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/*-*- Mode: C; c-basic-offset: 8 -*-*/
#ifndef foomanagerhfoo
#define foomanagerhfoo
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdbool.h>
#include <inttypes.h>
#include <stdio.h>
#include <dbus/dbus.h>
#include "fdset.h"
/* Enforce upper limit how many names we allow */
#define MANAGER_MAX_NAMES 2048
typedef struct Manager Manager;
typedef enum WatchType WatchType;
typedef struct Watch Watch;
typedef enum ManagerExitCode {
MANAGER_RUNNING,
MANAGER_EXIT,
MANAGER_RELOAD,
MANAGER_REEXECUTE,
_MANAGER_EXIT_CODE_MAX,
_MANAGER_EXIT_CODE_INVALID = -1
} ManagerExitCode;
typedef enum ManagerRunningAs {
MANAGER_INIT, /* root and pid=1 */
MANAGER_SYSTEM, /* root and pid!=1 */
MANAGER_SESSION, /* non-root, for a session */
_MANAGER_RUNNING_AS_MAX,
_MANAGER_RUNNING_AS_INVALID = -1
} ManagerRunningAs;
enum WatchType {
WATCH_INVALID,
WATCH_SIGNAL,
WATCH_FD,
WATCH_TIMER,
WATCH_MOUNT,
WATCH_UDEV,
WATCH_DBUS_WATCH,
WATCH_DBUS_TIMEOUT
};
struct Watch {
int fd;
WatchType type;
union {
union Unit *unit;
DBusWatch *bus_watch;
DBusTimeout *bus_timeout;
} data;
bool fd_is_dupped:1;
bool socket_accept:1;
};
#include "unit.h"
#include "job.h"
#include "hashmap.h"
#include "list.h"
#include "set.h"
#include "dbus.h"
#define SPECIAL_DEFAULT_TARGET "default.target"
/* This is not really intended to be started by directly. This is
* mostly so that other targets (reboot/halt/poweroff) can depend on
* it to bring all services down that want to be brought down on
* system shutdown. */
#define SPECIAL_SHUTDOWN_TARGET "shutdown.target"
#define SPECIAL_LOGGER_SOCKET "systemd-logger.socket"
#define SPECIAL_KBREQUEST_TARGET "kbrequest.target"
#define SPECIAL_SIGPWR_TARGET "sigpwr.target"
#define SPECIAL_CTRL_ALT_DEL_TARGET "ctrl-alt-del.target"
#define SPECIAL_LOCAL_FS_TARGET "local-fs.target"
#define SPECIAL_REMOTE_FS_TARGET "remote-fs.target"
#define SPECIAL_SWAP_TARGET "swap.target"
#define SPECIAL_NETWORK_TARGET "network.target"
#define SPECIAL_NSS_LOOKUP_TARGET "nss-lookup.target" /* LSB's $named */
#define SPECIAL_RPCBIND_TARGET "rpcbind.target" /* LSB's $portmap */
#define SPECIAL_SYSLOG_TARGET "syslog.target" /* Should pull in syslog.socket or syslog.service */
#define SPECIAL_RTC_SET_TARGET "rtc-set.target" /* LSB's $time */
#define SPECIAL_BASIC_TARGET "basic.target"
#define SPECIAL_RESCUE_TARGET "rescue.target"
#ifndef SPECIAL_DBUS_SERVICE
#define SPECIAL_DBUS_SERVICE "dbus.service"
#endif
#ifndef SPECIAL_SYSLOG_SERVICE
#define SPECIAL_SYSLOG_SERVICE "syslog.service"
#endif
/* For SysV compatibility. Usually an alias for a saner target. On
* SysV-free systems this doesn't exist. */
#define SPECIAL_RUNLEVEL0_TARGET "runlevel0.target"
#define SPECIAL_RUNLEVEL1_TARGET "runlevel1.target"
#define SPECIAL_RUNLEVEL2_TARGET "runlevel2.target"
#define SPECIAL_RUNLEVEL3_TARGET "runlevel3.target"
#define SPECIAL_RUNLEVEL4_TARGET "runlevel4.target"
#define SPECIAL_RUNLEVEL5_TARGET "runlevel5.target"
#define SPECIAL_RUNLEVEL6_TARGET "runlevel6.target"
struct Manager {
uint32_t current_job_id;
/* Note that the set of units we know of is allowed to be
* incosistent. However the subset of it that is loaded may
* not, and the list of jobs may neither. */
/* Active jobs and units */
Hashmap *units; /* name string => Unit object n:1 */
Hashmap *jobs; /* job id => Job object 1:1 */
/* To make it easy to iterate through the units of a specific
* type we maintain a per type linked list */
LIST_HEAD(Meta, units_per_type[_UNIT_TYPE_MAX]);
/* Units that need to be loaded */
LIST_HEAD(Meta, load_queue); /* this is actually more a stack than a queue, but uh. */
/* Jobs that need to be run */
LIST_HEAD(Job, run_queue); /* more a stack than a queue, too */
/* Units and jobs that have not yet been announced via
* D-Bus. When something about a job changes it is added here
* if it is not in there yet. This allows easy coalescing of
* D-Bus change signals. */
LIST_HEAD(Meta, dbus_unit_queue);
LIST_HEAD(Job, dbus_job_queue);
/* Units to remove */
LIST_HEAD(Meta, cleanup_queue);
/* Units to check when doing GC */
LIST_HEAD(Meta, gc_queue);
/* Jobs to be added */
Hashmap *transaction_jobs; /* Unit object => Job object list 1:1 */
JobDependency *transaction_anchor;
Hashmap *watch_pids; /* pid => Unit object n:1 */
Watch signal_watch;
int epoll_fd;
unsigned n_snapshots;
char **unit_path;
char **sysvinit_path;
char **sysvrcnd_path;
char **environment;
usec_t boot_timestamp;
/* Data specific to the device subsystem */
struct udev* udev;
struct udev_monitor* udev_monitor;
Watch udev_watch;
/* Data specific to the mount subsystem */
FILE *proc_self_mountinfo;
Watch mount_watch;
/* Data specific to the swap filesystem */
FILE *proc_swaps;
/* Data specific to the D-Bus subsystem */
DBusConnection *api_bus, *system_bus;
Set *subscribed;
DBusMessage *queued_message; /* This is used during reloading:
* before the reload we queue the
* reply message here, and
* afterwards we send it */
Hashmap *watch_bus; /* D-Bus names => Unit object n:1 */
int32_t name_data_slot;
/* Data specific to the Automount subsystem */
int dev_autofs_fd;
/* Data specific to the cgroup subsystem */
Hashmap *cgroup_bondings; /* path string => CGroupBonding object 1:n */
char *cgroup_controller;
char *cgroup_hierarchy;
usec_t gc_queue_timestamp;
int gc_marker;
unsigned n_in_gc_queue;
/* Flags */
ManagerRunningAs running_as;
ManagerExitCode exit_code:4;
bool dispatching_load_queue:1;
bool dispatching_run_queue:1;
bool dispatching_dbus_queue:1;
bool request_api_bus_dispatch:1;
bool request_system_bus_dispatch:1;
bool utmp_reboot_written:1;
bool confirm_spawn:1;
};
int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **m);
void manager_free(Manager *m);
int manager_enumerate(Manager *m);
int manager_coldplug(Manager *m);
int manager_startup(Manager *m, FILE *serialization, FDSet *fds);
Job *manager_get_job(Manager *m, uint32_t id);
Unit *manager_get_unit(Manager *m, const char *name);
int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u);
int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j);
int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret);
int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret);
int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret);
int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool force, Job **_ret);
void manager_dump_units(Manager *s, FILE *f, const char *prefix);
void manager_dump_jobs(Manager *s, FILE *f, const char *prefix);
void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies);
void manager_clear_jobs(Manager *m);
unsigned manager_dispatch_load_queue(Manager *m);
unsigned manager_dispatch_run_queue(Manager *m);
unsigned manager_dispatch_dbus_queue(Manager *m);
int manager_loop(Manager *m);
void manager_write_utmp_reboot(Manager *m);
void manager_write_utmp_runlevel(Manager *m, Unit *t);
void manager_dispatch_bus_name_owner_changed(Manager *m, const char *name, const char* old_owner, const char *new_owner);
void manager_dispatch_bus_query_pid_done(Manager *m, const char *name, pid_t pid);
int manager_open_serialization(FILE **_f);
int manager_serialize(Manager *m, FILE *f, FDSet *fds);
int manager_deserialize(Manager *m, FILE *f, FDSet *fds);
int manager_reload(Manager *m);
const char *manager_running_as_to_string(ManagerRunningAs i);
ManagerRunningAs manager_running_as_from_string(const char *s);
#endif
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