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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-misc.c A few assorted public functions that don't fit elsewhere
*
* Copyright (C) 2006 Red Hat, Inc.
*
* Licensed under the Academic Free License version 2.1
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <config.h>
#include "dbus-misc.h"
#include "dbus-internals.h"
#include "dbus-string.h"
/**
* @defgroup DBusMisc Miscellaneous
* @ingroup DBus
* @brief Miscellaneous API that doesn't cleanly fit anywhere else
*
* @{
*/
/**
* Obtains the machine UUID of the machine this process is running on.
*
* The returned string must be freed with dbus_free().
*
* This UUID is guaranteed to remain the same until the next reboot
* (unless the sysadmin foolishly changes it and screws themselves).
* It will usually remain the same across reboots also, but hardware
* configuration changes or rebuilding the machine could break that.
*
* The idea is that two processes with the same machine ID should be
* able to use shared memory, UNIX domain sockets, process IDs, and other
* features of the OS that require both processes to be running
* on the same OS kernel instance.
*
* The machine ID can also be used to create unique per-machine
* instances. For example, you could use it in bus names or
* X selection names.
*
* The machine ID is preferred over the machine hostname, because
* the hostname is frequently set to "localhost.localdomain" and
* may also change at runtime.
*
* You can get the machine ID of a remote application by invoking the
* method GetMachineId from interface org.freedesktop.DBus.Peer.
*
* If the remote application has the same machine ID as the one
* returned by this function, then the remote application is on the
* same machine as your application.
*
* The UUID is not a UUID in the sense of RFC4122; the details
* are explained in the D-Bus specification.
*
* @returns a 32-byte-long hex-encoded UUID string, or #NULL if insufficient memory
*/
char*
dbus_get_local_machine_id (void)
{
DBusString uuid;
char *s;
s = NULL;
_dbus_string_init (&uuid);
if (!_dbus_get_local_machine_uuid_encoded (&uuid) ||
!_dbus_string_steal_data (&uuid, &s))
{
_dbus_string_free (&uuid);
return FALSE;
}
else
{
_dbus_string_free (&uuid);
return s;
}
}
/** @} */ /* End of public API */
#ifdef DBUS_BUILD_TESTS
#ifndef DOXYGEN_SHOULD_SKIP_THIS
#include "dbus-test.h"
#include <stdlib.h>
dbus_bool_t
_dbus_misc_test (void)
{
return TRUE;
}
#endif /* !DOXYGEN_SHOULD_SKIP_THIS */
#endif
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