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Systemd/src/systemctl.c

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/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
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 <sys/reboot.h>
#include <stdio.h>
#include <getopt.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include <dbus/dbus.h>
#include "log.h"
#include "util.h"
#include "macro.h"
#include "set.h"
#include "utmp-wtmp.h"
static const char *arg_type = NULL;
static bool arg_all = false;
static bool arg_replace = false;
static bool arg_session = false;
static bool arg_block = false;
static bool arg_immediate = false;
static bool arg_no_wtmp = false;
static bool arg_no_sync = false;
static bool arg_dry = false;
static char **arg_wall = NULL;
enum action {
ACTION_INVALID,
ACTION_SYSTEMCTL,
ACTION_HALT,
ACTION_POWEROFF,
ACTION_REBOOT,
ACTION_RUNLEVEL1,
ACTION_RUNLEVEL2,
ACTION_RUNLEVEL3,
ACTION_RUNLEVEL4,
ACTION_RUNLEVEL5,
ACTION_RESCUE,
ACTION_RELOAD,
ACTION_REEXEC,
ACTION_RUNLEVEL,
_ACTION_MAX
} arg_action = ACTION_SYSTEMCTL;
static bool error_is_no_service(DBusError *error) {
if (!dbus_error_is_set(error))
return false;
if (dbus_error_has_name(error, DBUS_ERROR_NAME_HAS_NO_OWNER))
return true;
if (dbus_error_has_name(error, DBUS_ERROR_SERVICE_UNKNOWN))
return true;
return startswith(error->name, "org.freedesktop.DBus.Error.Spawn.");
}
static int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next) {
if (dbus_message_iter_get_arg_type(iter) != type)
return -EIO;
dbus_message_iter_get_basic(iter, data);
if (!dbus_message_iter_next(iter) != !next)
return -EIO;
return 0;
}
static int columns(void) {
static int parsed_columns = 0;
const char *e;
if (parsed_columns > 0)
return parsed_columns;
if ((e = getenv("COLUMNS")))
parsed_columns = atoi(e);
if (parsed_columns <= 0) {
struct winsize ws;
zero(ws);
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
parsed_columns = ws.ws_col;
}
if (parsed_columns <= 0)
parsed_columns = 80;
return parsed_columns;
}
static int list_units(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
DBusMessageIter iter, sub, sub2;
unsigned k = 0;
dbus_error_init(&error);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"ListUnits"))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter, &sub);
printf("%-45s %-6s %-12s %-12s %-15s %s\n", "UNIT", "LOAD", "ACTIVE", "SUB", "JOB", "DESCRIPTION");
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *id, *description, *load_state, *active_state, *sub_state, *unit_state, *job_type, *job_path, *dot;
uint32_t job_id;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&sub, &sub2);
if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &id, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &description, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &load_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &active_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &sub_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &job_id, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &job_type, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &job_path, false) < 0) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
if ((!arg_type || ((dot = strrchr(id, '.')) &&
streq(dot+1, arg_type))) &&
(arg_all || !streq(active_state, "inactive"))) {
int a = 0, b = 0;
printf("%-45s %-6s %-12s %-12s%n", id, load_state, active_state, sub_state, &a);
if (job_id != 0)
printf(" %-15s%n", job_type, &b);
else
b = 1 + 15;
if (a + b + 2 < columns()) {
if (job_id == 0)
printf(" ");
printf("%.*s", columns() - a - b - 2, description);
}
fputs("\n", stdout);
k++;
}
dbus_message_iter_next(&sub);
}
if (arg_all)
printf("\n%u units listed.\n", k);
else
printf("\n%u live units listed. Pass --all to see dead units, too.\n", k);
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int list_jobs(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
DBusMessageIter iter, sub, sub2;
unsigned k = 0;
dbus_error_init(&error);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"ListJobs"))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter, &sub);
printf("%4s %-45s %-17s %-7s\n", "JOB", "UNIT", "TYPE", "STATE");
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *name, *type, *state, *job_path, *unit_path;
uint32_t id;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&sub, &sub2);
if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &id, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &name, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &type, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &job_path, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_path, false) < 0) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
printf("%4u %-45s %-17s %-7s\n", id, name, type, state);
k++;
dbus_message_iter_next(&sub);
}
printf("\n%u jobs listed.\n", k);
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int load_unit(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
unsigned i;
dbus_error_init(&error);
for (i = 1; i < n; i++) {
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"LoadUnit"))) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &args[i],
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
dbus_message_unref(m);
dbus_message_unref(reply);
m = reply = NULL;
}
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int cancel_job(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
unsigned i;
dbus_error_init(&error);
for (i = 1; i < n; i++) {
unsigned id;
const char *path;
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"GetJob"))) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
if ((r = safe_atou(args[i], &id)) < 0) {
log_error("Failed to parse job id: %s", strerror(-r));
goto finish;
}
assert_cc(sizeof(uint32_t) == sizeof(id));
if (!dbus_message_append_args(m,
DBUS_TYPE_UINT32, &id,
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_get_args(reply, &error,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID)) {
log_error("Failed to parse reply: %s", error.message);
r = -EIO;
goto finish;
}
dbus_message_unref(m);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
path,
"org.freedesktop.systemd1.Job",
"Cancel"))) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
dbus_message_unref(reply);
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
dbus_message_unref(m);
dbus_message_unref(reply);
m = reply = NULL;
}
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static DBusHandlerResult wait_filter(DBusConnection *connection, DBusMessage *message, void *data) {
DBusError error;
Set *s = data;
assert(connection);
assert(message);
assert(s);
dbus_error_init(&error);
/* log_debug("Got D-Bus request: %s.%s() on %s", */
/* dbus_message_get_interface(message), */
/* dbus_message_get_member(message), */
/* dbus_message_get_path(message)); */
if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
log_error("Warning! D-Bus connection terminated.");
dbus_connection_close(connection);
} else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "JobRemoved")) {
uint32_t id;
const char *path;
if (!dbus_message_get_args(message, &error,
DBUS_TYPE_UINT32, &id,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID))
log_error("Failed to parse message: %s", error.message);
else {
char *p;
if ((p = set_remove(s, (char*) path)))
free(p);
}
}
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
static int enable_wait_for_jobs(DBusConnection *bus) {
DBusError error;
DBusMessage *m = NULL, *reply = NULL;
int r;
assert(bus);
dbus_error_init(&error);
dbus_bus_add_match(bus,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.systemd1.Manager',"
"member='JobRemoved',"
"path='/org/freedesktop/systemd1'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to add match: %s", error.message);
r = -EIO;
goto finish;
}
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"Subscribe"))) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
r = 0;
finish:
/* This is slightly dirty, since we don't undo the match registrations. */
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int wait_for_jobs(DBusConnection *bus, Set *s) {
int r;
assert(bus);
assert(s);
if (!dbus_connection_add_filter(bus, wait_filter, s, NULL)) {
log_error("Failed to add filter.");
r = -ENOMEM;
goto finish;
}
while (!set_isempty(s) &&
dbus_connection_read_write_dispatch(bus, -1))
;
r = 0;
finish:
/* This is slightly dirty, since we don't undo the filter registration. */
return r;
}
static int start_unit_one(
DBusConnection *bus,
const char *method,
const char *name,
const char *mode,
Set *s) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
assert(bus);
assert(method);
assert(name);
assert(mode);
assert(!arg_block || s);
dbus_error_init(&error);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
method))) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_STRING, &mode,
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
if (arg_action != ACTION_SYSTEMCTL && error_is_no_service(&error)) {
/* There's always a fallback possible for
* legacy actions. */
r = 0;
goto finish;
}
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (arg_block) {
const char *path;
char *p;
if (!dbus_message_get_args(reply, &error,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID)) {
log_error("Failed to parse reply: %s", error.message);
r = -EIO;
goto finish;
}
if (!(p = strdup(path))) {
log_error("Failed to duplicate path.");
r = -ENOMEM;
goto finish;
}
if ((r = set_put(s, p)) < 0) {
free(p);
log_error("Failed to add path to set.");
goto finish;
}
}
r = 1;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int start_unit(DBusConnection *bus, char **args, unsigned n) {
static const char * const table[_ACTION_MAX] = {
[ACTION_HALT] = "halt.target",
[ACTION_POWEROFF] = "poweroff.target",
[ACTION_REBOOT] = "reboot.target",
[ACTION_RUNLEVEL1] = "runlevel1.target",
[ACTION_RUNLEVEL2] = "runlevel2.target",
[ACTION_RUNLEVEL3] = "runlevel3.target",
[ACTION_RUNLEVEL4] = "runlevel4.target",
[ACTION_RUNLEVEL5] = "runlevel5.target",
[ACTION_RESCUE] = "rescue.target"
};
int r;
unsigned i;
const char *method, *mode;
Set *s = NULL;
if (arg_action == ACTION_SYSTEMCTL) {
method =
streq(args[0], "start") ? "StartUnit" :
streq(args[0], "stop") ? "StopUnit" :
streq(args[0], "reload") ? "ReloadUnit" :
streq(args[0], "restart") ? "RestartUnit" :
/* isolate */ "StartUnit";
mode =
streq(args[0], "isolate") ? "isolate" :
arg_replace ? "replace" :
"fail";
if (arg_block) {
if ((r = enable_wait_for_jobs(bus)) < 0) {
log_error("Could not watch jobs: %s", strerror(-r));
goto finish;
}
if (!(s = set_new(string_hash_func, string_compare_func))) {
log_error("Failed to allocate set.");
r = -ENOMEM;
goto finish;
}
}
} else {
assert(arg_action < ELEMENTSOF(table));
assert(table[arg_action]);
method = "StartUnit";
mode = arg_action == ACTION_RESCUE ? "isolate" : "replace";
}
r = 0;
if (arg_action == ACTION_SYSTEMCTL) {
for (i = 1; i < n; i++)
if ((r = start_unit_one(bus, method, args[i], mode, s)) < 0)
goto finish;
if (arg_block)
r = wait_for_jobs(bus, s);
} else {
if ((r = start_unit_one(bus, method, table[arg_action], mode, s)) <= 0)
goto finish;
}
finish:
if (s)
set_free_free(s);
return r;
}
static DBusHandlerResult monitor_filter(DBusConnection *connection, DBusMessage *message, void *data) {
DBusError error;
DBusMessage *m = NULL, *reply = NULL;
assert(connection);
assert(message);
dbus_error_init(&error);
/* log_debug("Got D-Bus request: %s.%s() on %s", */
/* dbus_message_get_interface(message), */
/* dbus_message_get_member(message), */
/* dbus_message_get_path(message)); */
if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
log_error("Warning! D-Bus connection terminated.");
dbus_connection_close(connection);
} else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "UnitNew") ||
dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "UnitRemoved")) {
const char *id, *path;
if (!dbus_message_get_args(message, &error,
DBUS_TYPE_STRING, &id,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID))
log_error("Failed to parse message: %s", error.message);
else if (streq(dbus_message_get_member(message), "UnitNew"))
printf("Unit %s added.\n", id);
else
printf("Unit %s removed.\n", id);
} else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "JobNew") ||
dbus_message_is_signal(message, "org.freedesktop.systemd1.Manager", "JobRemoved")) {
uint32_t id;
const char *path;
if (!dbus_message_get_args(message, &error,
DBUS_TYPE_UINT32, &id,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID))
log_error("Failed to parse message: %s", error.message);
else if (streq(dbus_message_get_member(message), "JobNew"))
printf("Job %u added.\n", id);
else
printf("Job %u removed.\n", id);
} else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Unit", "Changed") ||
dbus_message_is_signal(message, "org.freedesktop.systemd1.Job", "Changed")) {
const char *path, *interface, *property = "Id";
DBusMessageIter iter, sub;
path = dbus_message_get_path(message);
interface = dbus_message_get_interface(message);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
path,
"org.freedesktop.DBus.Properties",
"Get"))) {
log_error("Could not allocate message.");
goto oom;
}
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_STRING, &property,
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(connection, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
goto finish;
}
if (!dbus_message_iter_init(reply, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
log_error("Failed to parse reply.");
goto finish;
}
dbus_message_iter_recurse(&iter, &sub);
if (streq(interface, "org.freedesktop.systemd1.Unit")) {
const char *id;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
log_error("Failed to parse reply.");
goto finish;
}
dbus_message_iter_get_basic(&sub, &id);
printf("Unit %s changed.\n", id);
} else {
uint32_t id;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_UINT32) {
log_error("Failed to parse reply.");
goto finish;
}
dbus_message_iter_get_basic(&sub, &id);
printf("Job %u changed.\n", id);
}
}
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
oom:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static int monitor(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
dbus_error_init(&error);
dbus_bus_add_match(bus,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.systemd1.Manager',"
"path='/org/freedesktop/systemd1'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to add match: %s", error.message);
r = -EIO;
goto finish;
}
dbus_bus_add_match(bus,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.systemd1.Unit',"
"member='Changed'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to add match: %s", error.message);
r = -EIO;
goto finish;
}
dbus_bus_add_match(bus,
"type='signal',"
"sender='org.freedesktop.systemd1',"
"interface='org.freedesktop.systemd1.Job',"
"member='Changed'",
&error);
if (dbus_error_is_set(&error)) {
log_error("Failed to add match: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_connection_add_filter(bus, monitor_filter, NULL, NULL)) {
log_error("Failed to add filter.");
r = -ENOMEM;
goto finish;
}
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"Subscribe"))) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
while (dbus_connection_read_write_dispatch(bus, -1))
;
r = 0;
finish:
/* This is slightly dirty, since we don't undo the filter or the matches. */
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int dump(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
const char *text;
dbus_error_init(&error);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"Dump"))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_get_args(reply, &error,
DBUS_TYPE_STRING, &text,
DBUS_TYPE_INVALID)) {
log_error("Failed to parse reply: %s", error.message);
r = -EIO;
goto finish;
}
fputs(text, stdout);
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int snapshot(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
const char *name = "", *path, *id;
dbus_bool_t cleanup = FALSE;
DBusMessageIter iter, sub;
const char
*interface = "org.freedesktop.systemd1.Unit",
*property = "Id";
dbus_error_init(&error);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"CreateSnapshot"))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (n > 1)
name = args[1];
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_BOOLEAN, &cleanup,
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_get_args(reply, &error,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID)) {
log_error("Failed to parse reply: %s", error.message);
r = -EIO;
goto finish;
}
dbus_message_unref(m);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
path,
"org.freedesktop.DBus.Properties",
"Get"))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_STRING, &property,
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
dbus_message_unref(reply);
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter, &sub);
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_get_basic(&sub, &id);
puts(id);
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int clear_jobs(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
const char *method;
dbus_error_init(&error);
if (arg_action == ACTION_RELOAD)
method = "Reload";
else if (arg_action == ACTION_REEXEC)
method = "Reexecute";
else {
assert(arg_action == ACTION_SYSTEMCTL);
method =
streq(args[0], "clear-jobs") ? "ClearJobs" :
streq(args[0], "daemon-reload") ? "Reload" :
streq(args[0], "daemon-reexec") ? "Reexecute" :
"Exit";
}
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
method))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
if (arg_action != ACTION_SYSTEMCTL && error_is_no_service(&error)) {
/* There's always a fallback possible for
* legacy actions. */
r = 0;
goto finish;
}
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
r = 1;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int show_enviroment(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
DBusMessageIter iter, sub, sub2;
int r;
const char
*interface = "org.freedesktop.systemd1.Manager",
*property = "Environment";
dbus_error_init(&error);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.DBus.Properties",
"Get"))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_STRING, &property,
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter, &sub);
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_ARRAY ||
dbus_message_iter_get_element_type(&sub) != DBUS_TYPE_STRING) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&sub, &sub2);
while (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_INVALID) {
const char *text;
if (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_STRING) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_get_basic(&sub2, &text);
printf("%s\n", text);
dbus_message_iter_next(&sub2);
}
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int set_environment(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
const char *method;
DBusMessageIter iter, sub;
unsigned i;
dbus_error_init(&error);
method = streq(args[0], "set-environment")
? "SetEnvironment"
: "UnsetEnvironment";
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
method))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
dbus_message_iter_init_append(m, &iter);
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
for (i = 1; i < n; i++)
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &args[i])) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!dbus_message_iter_close_container(&iter, &sub)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int systemctl_help(void) {
printf("%s [options]\n\n"
"Send control commands to the init system.\n\n"
" -h --help Show this help\n"
" -t --type=TYPE List only units of a particular type\n"
" -a --all Show all units, including dead ones\n"
" --replace When installing a new job, replace existing conflicting ones\n"
" --system Connect to system bus\n"
" --session Connect to session bus\n"
" --block Wait until operation finished\n\n"
"Commands:\n"
" list-units List units\n"
" list-jobs List jobs\n"
" clear-jobs Cancel all jobs\n"
" load [NAME...] Load one or more units\n"
" cancel [JOB...] Cancel one or more jobs\n"
" start [NAME...] Start one or more units\n"
" stop [NAME...] Stop one or more units\n"
" restart [NAME...] Restart one or more units\n"
" reload [NAME...] Reload one or more units\n"
" isolate [NAME] Start one unit and stop all others\n"
" monitor Monitor unit/job changes\n"
" dump Dump server status\n"
" snapshot [NAME] Create a snapshot\n"
" daemon-reload Reload daemon configuration\n"
" daemon-reexecute Reexecute daemon\n"
" daemon-exit Ask the daemon to quit\n"
" show-environment Dump environment\n"
" set-environment [NAME=VALUE...] Set one or more environment variables\n"
" unset-environment [NAME...] Unset one or more environment variables\n",
program_invocation_short_name);
return 0;
}
static int halt_help(void) {
printf("%s [options]\n\n"
"%s the system.\n\n"
" --help Show this help\n"
" --halt Halt the machine\n"
" -p --poweroff Switch off the machine\n"
" --reboot Reboot the machine\n"
" -f --force Force immediate reboot/halt/power-off\n"
" -w --wtmp-only Don't reboot/halt/power-off, just write wtmp record\n"
" -d --no-wtmp Don't write wtmp record\n"
" -n --no-sync Don't sync before reboot/halt/power-off\n",
program_invocation_short_name,
arg_action == ACTION_REBOOT ? "Reboot" :
arg_action == ACTION_POWEROFF ? "Power off" :
"Halt");
return 0;
}
static int shutdown_help(void) {
printf("%s [options] [TIME] [WALL...]\n\n"
"Shut down the system.\n\n"
" --help Show this help\n"
" -H --halt Halt the machine\n"
" -P --poweroff Power-off the machine\n"
" -r --reboot Reboot the machine\n"
" -h Equivalent to --poweroff, overriden by --halt\n"
" -k Don't reboot/halt/power-off, just send warnings\n",
program_invocation_short_name);
return 0;
}
static int telinit_help(void) {
printf("%s [options]\n\n"
"Send control commands to the init system.\n\n"
" --help Show this help\n\n"
"Commands:\n"
" 0 Power-off the machine\n"
" 6 Reboot the machine\n"
" 1, 2, 3, 4, 5 Start runlevelX.target unit\n"
" s, S Start the rescue.target unit\n"
" q, Q Ask systemd to reload its configuration\n"
" u, U Ask systemd to reexecute itself\n",
program_invocation_short_name);
return 0;
}
static int runlevel_help(void) {
printf("%s [options]\n\n"
"Prints the previous and current runlevel of the init system.\n\n"
" --help Show this help\n",
program_invocation_short_name);
return 0;
}
static int systemctl_parse_argv(int argc, char *argv[]) {
enum {
ARG_REPLACE = 0x100,
ARG_SESSION,
ARG_SYSTEM,
ARG_BLOCK
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "type", required_argument, NULL, 't' },
{ "all", no_argument, NULL, 'a' },
{ "replace", no_argument, NULL, ARG_REPLACE },
{ "session", no_argument, NULL, ARG_SESSION },
{ "system", no_argument, NULL, ARG_SYSTEM },
{ "block", no_argument, NULL, ARG_BLOCK },
{ NULL, 0, NULL, 0 }
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hta", options, NULL)) >= 0) {
switch (c) {
case 'h':
systemctl_help();
return 0;
case 't':
arg_type = optarg;
break;
case 'a':
arg_all = true;
break;
case ARG_REPLACE:
arg_replace = true;
break;
case ARG_SESSION:
arg_session = true;
break;
case ARG_SYSTEM:
arg_session = false;
break;
case ARG_BLOCK:
arg_block = true;
break;
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
return 1;
}
static int halt_parse_argv(int argc, char *argv[]) {
enum {
ARG_HELP = 0x100,
ARG_HALT,
ARG_REBOOT
};
static const struct option options[] = {
{ "help", no_argument, NULL, ARG_HELP },
{ "halt", no_argument, NULL, ARG_HALT },
{ "poweroff", no_argument, NULL, 'p' },
{ "reboot", no_argument, NULL, ARG_REBOOT },
{ "force", no_argument, NULL, 'f' },
{ "wtmp-only", no_argument, NULL, 'w' },
{ "no-wtmp", no_argument, NULL, 'd' },
{ "no-sync", no_argument, NULL, 'n' },
{ NULL, 0, NULL, 0 }
};
int c, runlevel;
assert(argc >= 0);
assert(argv);
if (utmp_get_runlevel(&runlevel, NULL) >= 0)
if (runlevel == '0' || runlevel == '6')
arg_immediate = true;
while ((c = getopt_long(argc, argv, "pfwdnih", options, NULL)) >= 0) {
switch (c) {
case ARG_HELP:
halt_help();
return 0;
case ARG_HALT:
arg_action = ACTION_HALT;
break;
case 'p':
arg_action = ACTION_POWEROFF;
break;
case ARG_REBOOT:
arg_action = ACTION_REBOOT;
break;
case 'f':
arg_immediate = true;
break;
case 'w':
arg_dry = true;
break;
case 'd':
arg_no_wtmp = true;
break;
case 'n':
arg_no_sync = true;
break;
case 'i':
case 'h':
/* Compatibility nops */
break;
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
if (optind < argc) {
log_error("Too many arguments.");
return -EINVAL;
}
return 1;
}
static int shutdown_parse_argv(int argc, char *argv[]) {
enum {
ARG_HELP = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, ARG_HELP },
{ "halt", no_argument, NULL, 'H' },
{ "poweroff", no_argument, NULL, 'P' },
{ "reboot", no_argument, NULL, 'r' },
{ NULL, 0, NULL, 0 }
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "HPrhkt:a", options, NULL)) >= 0) {
switch (c) {
case ARG_HELP:
shutdown_help();
return 0;
case 'H':
arg_action = ACTION_HALT;
break;
case 'P':
arg_action = ACTION_POWEROFF;
break;
case 'r':
arg_action = ACTION_REBOOT;
break;
case 'h':
if (arg_action != ACTION_HALT)
arg_action = ACTION_POWEROFF;
break;
case 'k':
arg_dry = true;
break;
case 't':
case 'a':
/* Compatibility nops */
break;
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
/* We ignore the time argument */
if (argc > optind + 1)
arg_wall = argv + optind + 1;
optind = argc;
return 1;
}
static int telinit_parse_argv(int argc, char *argv[]) {
enum {
ARG_HELP = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, ARG_HELP },
{ NULL, 0, NULL, 0 }
};
static const struct {
char from;
enum action to;
} table[] = {
{ '0', ACTION_POWEROFF },
{ '6', ACTION_REBOOT },
{ '1', ACTION_RUNLEVEL1 },
{ '2', ACTION_RUNLEVEL2 },
{ '3', ACTION_RUNLEVEL3 },
{ '4', ACTION_RUNLEVEL4 },
{ '5', ACTION_RUNLEVEL5 },
{ 's', ACTION_RESCUE },
{ 'S', ACTION_RESCUE },
{ 'q', ACTION_RELOAD },
{ 'Q', ACTION_RELOAD },
{ 'u', ACTION_REEXEC },
{ 'U', ACTION_REEXEC }
};
unsigned i;
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0) {
switch (c) {
case ARG_HELP:
telinit_help();
return 0;
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
if (optind >= argc) {
log_error("Argument missing.");
return -EINVAL;
}
if (optind + 1 < argc) {
log_error("Too many arguments.");
return -EINVAL;
}
if (strlen(argv[optind]) != 1) {
log_error("Expected single character argument.");
return -EINVAL;
}
for (i = 0; i < ELEMENTSOF(table); i++)
if (table[i].from == argv[optind][0])
break;
if (i >= ELEMENTSOF(table)) {
log_error("Unknown command %s.", argv[optind]);
return -EINVAL;
}
arg_action = table[i].to;
optind ++;
return 1;
}
static int runlevel_parse_argv(int argc, char *argv[]) {
enum {
ARG_HELP = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, ARG_HELP },
{ NULL, 0, NULL, 0 }
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0) {
switch (c) {
case ARG_HELP:
runlevel_help();
return 0;
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
if (optind < argc) {
log_error("Too many arguments.");
return -EINVAL;
}
return 1;
}
static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
if (program_invocation_short_name) {
if (strstr(program_invocation_short_name, "halt")) {
arg_action = ACTION_HALT;
return halt_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "poweroff")) {
arg_action = ACTION_POWEROFF;
return halt_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "reboot")) {
arg_action = ACTION_REBOOT;
return halt_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "shutdown")) {
arg_action = ACTION_POWEROFF;
return shutdown_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "init")) {
arg_action = ACTION_INVALID;
return telinit_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "runlevel")) {
arg_action = ACTION_RUNLEVEL;
return runlevel_parse_argv(argc, argv);
}
}
arg_action = ACTION_SYSTEMCTL;
return systemctl_parse_argv(argc, argv);
}
static int talk_upstart(DBusConnection *bus) {
log_error("Talking upstart");
return 0;
}
static int talk_initctl(void) {
log_error("Talking initctl");
return 0;
}
static int systemctl_main(DBusConnection *bus, int argc, char *argv[]) {
static const struct {
const char* verb;
const enum {
MORE,
LESS,
EQUAL
} argc_cmp;
const int argc;
int (* const dispatch)(DBusConnection *bus, char **args, unsigned n);
} verbs[] = {
{ "list-units", LESS, 1, list_units },
{ "list-jobs", EQUAL, 1, list_jobs },
{ "clear-jobs", EQUAL, 1, clear_jobs },
{ "load", MORE, 2, load_unit },
{ "cancel", MORE, 2, cancel_job },
{ "start", MORE, 2, start_unit },
{ "stop", MORE, 2, start_unit },
{ "reload", MORE, 2, start_unit },
{ "restart", MORE, 2, start_unit },
{ "isolate", EQUAL, 2, start_unit },
{ "monitor", EQUAL, 1, monitor },
{ "dump", EQUAL, 1, dump },
{ "snapshot", LESS, 2, snapshot },
{ "daemon-reload", EQUAL, 1, clear_jobs },
{ "daemon-reexec", EQUAL, 1, clear_jobs },
{ "daemon-exit", EQUAL, 1, clear_jobs },
{ "show-environment", EQUAL, 1, show_enviroment },
{ "set-environment", MORE, 2, set_environment },
{ "unset-environment", MORE, 2, set_environment },
};
int left;
unsigned i;
assert(bus);
assert(argc >= 0);
assert(argv);
left = argc - optind;
if (left <= 0)
/* Special rule: no arguments means "list-units" */
i = 0;
else {
for (i = 0; i < ELEMENTSOF(verbs); i++)
if (streq(argv[optind], verbs[i].verb))
break;
if (i >= ELEMENTSOF(verbs)) {
log_error("Unknown operation %s", argv[optind]);
return -EINVAL;
}
}
switch (verbs[i].argc_cmp) {
case EQUAL:
if (left != verbs[i].argc) {
log_error("Invalid number of arguments.");
return -EINVAL;
}
break;
case MORE:
if (left < verbs[i].argc) {
log_error("Too few arguments.");
return -EINVAL;
}
break;
case LESS:
if (left > verbs[i].argc) {
log_error("Too many arguments.");
return -EINVAL;
}
break;
default:
assert_not_reached("Unknown comparison operator.");
}
return verbs[i].dispatch(bus, argv + optind, left);
}
static int reload_with_fallback(DBusConnection *bus) {
int r;
if (bus) {
/* First, try systemd via D-Bus. */
if ((r = clear_jobs(bus, NULL, 0)) > 0)
return 0;
}
/* Nothing else worked, so let's try signals */
assert(arg_action == ACTION_RELOAD || arg_action == ACTION_REEXEC);
if (kill(1, arg_action == ACTION_RELOAD ? SIGHUP : SIGTERM) < 0) {
log_error("kill() failed: %m");
return -errno;
}
return 0;
}
static int start_with_fallback(DBusConnection *bus) {
int r;
if (bus) {
/* First, try systemd via D-Bus. */
if ((r = start_unit(bus, NULL, 0)) > 0)
return 0;
/* Hmm, talking to systemd via D-Bus didn't work. Then
* let's try to talk to Upstart via D-Bus. */
if ((r = talk_upstart(bus)) > 0)
return 0;
}
/* Nothing else worked, so let's try
* /dev/initctl */
return talk_initctl();
}
static int halt_main(DBusConnection *bus) {
int r;
if (!arg_immediate)
return start_with_fallback(bus);
if (!arg_no_wtmp)
if ((r = utmp_put_shutdown(0)) < 0)
log_warning("Failed to write utmp record: %s", strerror(-r));
if (!arg_no_sync)
sync();
if (arg_dry)
return 0;
/* Make sure C-A-D is handled by the kernel from this
* point on... */
reboot(RB_ENABLE_CAD);
switch (arg_action) {
case ACTION_HALT:
log_info("Halting");
reboot(RB_HALT_SYSTEM);
break;
case ACTION_POWEROFF:
log_info("Powering off");
reboot(RB_POWER_OFF);
break;
case ACTION_REBOOT:
log_info("Rebooting");
reboot(RB_AUTOBOOT);
break;
default:
assert_not_reached("Unknown halt action.");
}
/* We should never reach this. */
return -ENOSYS;
}
static int runlevel_main(void) {
int r, runlevel, previous;
if ((r = utmp_get_runlevel(&runlevel, &previous)) < 0) {
printf("unknown");
return r;
}
printf("%c %c\n",
previous <= 0 ? 'N' : previous,
runlevel <= 0 ? 'N' : runlevel);
return 0;
}
int main(int argc, char*argv[]) {
int r, retval = 1;
DBusConnection *bus = NULL;
DBusError error;
dbus_error_init(&error);
log_parse_environment();
if ((r = parse_argv(argc, argv)) < 0)
goto finish;
else if (r == 0) {
retval = 0;
goto finish;
}
/* /sbin/runlevel doesn't need to communicate via D-Bus, so
* let's shortcut this */
if (arg_action == ACTION_RUNLEVEL) {
retval = runlevel_main() < 0;
goto finish;
}
if ((bus = dbus_bus_get(arg_session ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error)))
dbus_connection_set_exit_on_disconnect(bus, FALSE);
switch (arg_action) {
case ACTION_SYSTEMCTL: {
if (!bus) {
log_error("Failed to get D-Bus connection: %s", error.message);
goto finish;
}
retval = systemctl_main(bus, argc, argv) < 0;
break;
}
case ACTION_HALT:
case ACTION_POWEROFF:
case ACTION_REBOOT:
retval = halt_main(bus) < 0;
break;
case ACTION_RUNLEVEL1:
case ACTION_RUNLEVEL2:
case ACTION_RUNLEVEL3:
case ACTION_RUNLEVEL4:
case ACTION_RUNLEVEL5:
case ACTION_RESCUE:
retval = start_with_fallback(bus) < 0;
break;
case ACTION_RELOAD:
case ACTION_REEXEC:
retval = reload_with_fallback(bus) < 0;
break;
default:
assert_not_reached("Unknown action");
}
finish:
if (bus)
dbus_connection_unref(bus);
dbus_error_free(&error);
dbus_shutdown();
return retval;
}
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