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systemd/src/login/inhibit.c

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logind: implement delay inhibitor locks in addition to block inhibitor locks This is useful to allow applications to synchronously save data before the system is suspended or shut down.
2012-05-05 02:34:48 +04:00
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <getopt.h>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <dbus.h>
#include <unistd.h>
#include "dbus-common.h"
#include "util.h"
#include "build.h"
#include "strv.h"
static const char* arg_what = "idle:suspend:shutdown";
static const char* arg_who = NULL;
static const char* arg_why = "Unknown reason";
static const char* arg_mode = "block";
static enum {
ACTION_INHIBIT,
ACTION_LIST
} arg_action = ACTION_INHIBIT;
static int inhibit(DBusConnection *bus, DBusError *error) {
DBusMessage *m = NULL, *reply = NULL;
int fd;
assert(bus);
m = dbus_message_new_method_call(
"org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
"Inhibit");
if (!m)
return -ENOMEM;
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &arg_what,
DBUS_TYPE_STRING, &arg_who,
DBUS_TYPE_STRING, &arg_why,
DBUS_TYPE_STRING, &arg_mode,
DBUS_TYPE_INVALID)) {
fd = -ENOMEM;
goto finish;
}
reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
if (!reply) {
fd = -EIO;
goto finish;
}
if (!dbus_message_get_args(reply, error,
DBUS_TYPE_UNIX_FD, &fd,
DBUS_TYPE_INVALID)){
fd = -EIO;
goto finish;
}
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
return fd;
}
static int print_inhibitors(DBusConnection *bus, DBusError *error) {
DBusMessage *m, *reply;
unsigned n = 0;
DBusMessageIter iter, sub, sub2;
int r;
assert(bus);
m = dbus_message_new_method_call(
"org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
"ListInhibitors");
if (!m)
return -ENOMEM;
reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
if (!reply) {
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter)) {
r = -ENOMEM;
goto finish;
}
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY) {
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter, &sub);
printf("%-21s %-20s %-20s %-5s %6s %6s\n",
"WHAT",
"WHO",
"WHY",
"MODE",
"UID",
"PID");
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *what, *who, *why, *mode;
char *ewho, *ewhy;
dbus_uint32_t uid, pid;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&sub, &sub2);
if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &what, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &who, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &why, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &mode, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &uid, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &pid, false) < 0) {
r = -EIO;
goto finish;
}
ewho = ellipsize(who, 20, 66);
ewhy = ellipsize(why, 20, 66);
printf("%-21s %-20s %-20s %-5s %6lu %6lu\n",
what, ewho ? ewho : who, ewhy ? ewhy : why, mode, (unsigned long) uid, (unsigned long) pid);
free(ewho);
free(ewhy);
dbus_message_iter_next(&sub);
n++;
}
printf("\n%u inhibitors listed.\n", n);
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
return r;
}
static int help(void) {
printf("%s [OPTIONS...] {COMMAND} ...\n\n"
"Execute a process while inhibiting shutdown/suspend/idle.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --what=WHAT Operations to inhibit, colon separated list of idle,\n"
" suspend, shutdown\n"
" --who=STRING A descriptive string who is inhibiting\n"
" --why=STRING A descriptive string why is being inhibited\n"
" --mode=MODE One of block or delay\n"
" --list List active inhibitors\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_WHAT,
ARG_WHO,
ARG_WHY,
ARG_MODE,
ARG_LIST,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "what", required_argument, NULL, ARG_WHAT },
{ "who", required_argument, NULL, ARG_WHO },
{ "why", required_argument, NULL, ARG_WHY },
{ "mode", required_argument, NULL, ARG_MODE },
{ "list", no_argument, NULL, ARG_LIST },
{ NULL, 0, NULL, 0 }
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0) {
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(DISTRIBUTION);
puts(SYSTEMD_FEATURES);
return 0;
case ARG_WHAT:
arg_what = optarg;
break;
case ARG_WHO:
arg_who = optarg;
break;
case ARG_WHY:
arg_why = optarg;
break;
case ARG_MODE:
arg_mode = optarg;
break;
case ARG_LIST:
arg_action = ACTION_LIST;
break;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
if (arg_action == ACTION_INHIBIT && optind >= argc) {
log_error("Missing command line to execute.");
return -EINVAL;
}
return 1;
}
int main(int argc, char *argv[]) {
int r, exit_code = 0;
DBusConnection *bus = NULL;
DBusError error;
int fd = -1;
dbus_error_init(&error);
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
if (!bus) {
log_error("Failed to connect to bus: %s", bus_error_message(&error));
r = -EIO;
goto finish;
}
if (arg_action == ACTION_LIST) {
r = print_inhibitors(bus, &error);
if (r < 0) {
log_error("Failed to list inhibitors: %s", bus_error_message_or_strerror(&error, -r));
goto finish;
}
} else {
char *w = NULL;
pid_t pid;
if (!arg_who)
arg_who = w = strv_join(argv + optind, " ");
fd = inhibit(bus, &error);
free(w);
if (fd < 0) {
log_error("Failed to inhibit: %s", bus_error_message_or_strerror(&error, -r));
r = fd;
goto finish;
}
pid = fork();
if (pid < 0) {
log_error("Failed to fork: %m");
r = -errno;
goto finish;
}
if (pid == 0) {
/* Child */
close_nointr_nofail(fd);
execvp(argv[optind], argv + optind);
log_error("Failed to execute %s: %m", argv[optind]);
_exit(EXIT_FAILURE);
}
r = wait_for_terminate_and_warn(argv[optind], pid);
if (r >= 0)
exit_code = r;
}
finish:
if (bus) {
dbus_connection_close(bus);
dbus_connection_unref(bus);
}
dbus_error_free(&error);
if (fd >= 0)
close_nointr_nofail(fd);
return r < 0 ? EXIT_FAILURE : exit_code;
}
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