1 /* -*- mode: C; c-file-style: "gnu" -*- */ 2 /* dbus-misc.c A few assorted public functions that don't fit elsewhere 3 * 4 * Copyright (C) 2006 Red Hat, Inc. 5 * 6 * Licensed under the Academic Free License version 2.1 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include <config.h> 25 #include "dbus-misc.h" 26 #include "dbus-internals.h" 27 #include "dbus-string.h" 28 29 /** 30 * @defgroup DBusMisc Miscellaneous 31 * @ingroup DBus 32 * @brief Miscellaneous API that doesn't cleanly fit anywhere else 33 * 34 * @{ 35 */ 36 37 /** 38 * Obtains the machine UUID of the machine this process is running on. 39 * 40 * The returned string must be freed with dbus_free(). 41 * 42 * This UUID is guaranteed to remain the same until the next reboot 43 * (unless the sysadmin foolishly changes it and screws themselves). 44 * It will usually remain the same across reboots also, but hardware 45 * configuration changes or rebuilding the machine could break that. 46 * 47 * The idea is that two processes with the same machine ID should be 48 * able to use shared memory, UNIX domain sockets, process IDs, and other 49 * features of the OS that require both processes to be running 50 * on the same OS kernel instance. 51 * 52 * The machine ID can also be used to create unique per-machine 53 * instances. For example, you could use it in bus names or 54 * X selection names. 55 * 56 * The machine ID is preferred over the machine hostname, because 57 * the hostname is frequently set to "localhost.localdomain" and 58 * may also change at runtime. 59 * 60 * You can get the machine ID of a remote application by invoking the 61 * method GetMachineId from interface org.freedesktop.DBus.Peer. 62 * 63 * If the remote application has the same machine ID as the one 64 * returned by this function, then the remote application is on the 65 * same machine as your application. 66 * 67 * The UUID is not a UUID in the sense of RFC4122; the details 68 * are explained in the D-Bus specification. 69 * 70 * @returns a 32-byte-long hex-encoded UUID string, or #NULL if insufficient memory 71 */ 72 char* 73 dbus_get_local_machine_id (void) 74 { 75 DBusString uuid; 76 char *s; 77 78 s = NULL; 79 _dbus_string_init (&uuid); 80 if (!_dbus_get_local_machine_uuid_encoded (&uuid) || 81 !_dbus_string_steal_data (&uuid, &s)) 82 { 83 _dbus_string_free (&uuid); 84 return FALSE; 85 } 86 else 87 { 88 _dbus_string_free (&uuid); 89 return s; 90 } 91 92 } 93 94 /** @} */ /* End of public API */ 95 96 #ifdef DBUS_BUILD_TESTS 97 98 #ifndef DOXYGEN_SHOULD_SKIP_THIS 99 100 #include "dbus-test.h" 101 #include <stdlib.h> 102 103 104 dbus_bool_t 105 _dbus_misc_test (void) 106 { 107 108 return TRUE; 109 } 110 111 #endif /* !DOXYGEN_SHOULD_SKIP_THIS */ 112 113 #endif 114
