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/* virt-p2v
* Copyright (C) 2016 Red Hat Inc.
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* This file is used to inhibit power saving, sleep, suspend etc during
* the conversion.
*
* The method it uses is to send a D-Bus message to logind, as
* described here:
*
* https://www.freedesktop.org/wiki/Software/systemd/inhibit/
*
* If virt-p2v is compiled without D-Bus support then this does nothing.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(HAVE_DBUS)
#include <dbus/dbus.h>
#endif
#include "p2v.h"
/**
* Inhibit all forms of power saving. A file descriptor is returned,
* and when the file descriptor is closed the inhibit is stopped.
*
* If the function returns C<-1> then C<Inhibit> operation could not
* be performed (eg. if we are compiled without D-Bus support, or there
* is some error contacting logind). This is not usually fatal from
* the point of view of the caller, conversion can continue.
*/
int
inhibit_power_saving (void)
{
#if defined(HAVE_DBUS) && defined(DBUS_TYPE_UNIX_FD)
DBusError err;
DBusConnection *conn = NULL;
DBusMessage *msg = NULL;
DBusMessageIter args;
DBusPendingCall *pending = NULL;
const char *what = "shutdown:sleep:idle";
const char *who = "virt-p2v";
const char *why = "virt-p2v conversion is running";
const char *mode = "block";
int fd = -1;
dbus_error_init (&err);
conn = dbus_bus_get (DBUS_BUS_SYSTEM, &err);
if (dbus_error_is_set (&err)) {
fprintf (stderr, "inhibit_power_saving: dbus: cannot connect to system bus: %s\n", err.message);
goto out;
}
if (conn == NULL)
goto out;
msg = dbus_message_new_method_call ("org.freedesktop.login1",
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
"Inhibit");
if (msg == NULL) {
fprintf (stderr, "inhibit_power_saving: dbus: cannot create message\n");
goto out;
}
dbus_message_iter_init_append (msg, &args);
if (!dbus_message_iter_append_basic (&args, DBUS_TYPE_STRING, &what) ||
!dbus_message_iter_append_basic (&args, DBUS_TYPE_STRING, &who) ||
!dbus_message_iter_append_basic (&args, DBUS_TYPE_STRING, &why) ||
!dbus_message_iter_append_basic (&args, DBUS_TYPE_STRING, &mode)) {
fprintf (stderr, "inhibit_power_saving: dbus: cannot add message arguments\n");
goto out;
}
if (!dbus_connection_send_with_reply (conn, msg, &pending, -1)) {
fprintf (stderr, "inhibit_power_saving: dbus: cannot send Inhibit message to logind\n");
goto out;
}
if (pending == NULL)
goto out;
dbus_connection_flush (conn);
dbus_message_unref (msg);
msg = NULL;
dbus_pending_call_block (pending);
msg = dbus_pending_call_steal_reply (pending);
if (msg == NULL) {
fprintf (stderr, "inhibit_power_saving: dbus: could not read message reply\n");
goto out;
}
dbus_pending_call_unref (pending);
pending = NULL;
if (!dbus_message_iter_init (msg, &args)) {
fprintf (stderr, "inhibit_power_saving: dbus: message reply has no return value\n");
goto out;
}
if (dbus_message_iter_get_arg_type (&args) != DBUS_TYPE_UNIX_FD) {
fprintf (stderr, "inhibit_power_saving: dbus: message reply is not a file descriptor\n");
goto out;
}
dbus_message_iter_get_basic (&args, &fd);
#ifdef DEBUG_STDERR
fprintf (stderr, "inhibit_power_saving: dbus: Inhibit() call returned file descriptor %d\n", fd);
#endif
out:
if (pending != NULL)
dbus_pending_call_unref (pending);
if (msg != NULL)
dbus_message_unref (msg);
/* This is the system bus connection, so unref-ing it does not
* actually close it.
*/
if (conn != NULL)
dbus_connection_unref (conn);
dbus_error_free (&err);
return fd;
#else /* !dbus */
#ifdef DEBUG_STDERR
fprintf (stderr, "warning: virt-p2v compiled without D-Bus support.\n");
#endif
return -1;
#endif
}
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