1/* 2 * Copyright (c) 2013 Apple Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23 24#include <sys/types.h> 25#include <sys/time.h> 26#include <sys/errno.h> 27#include <strings.h> 28#include <Availability.h> 29 30#include "gethostuuid_private.h" 31 32extern int __gethostuuid(uuid_t, const struct timespec *, int); 33 34static volatile int (*_gethostuuid_callback)(uuid_t) = (void *)0; 35 36int 37gethostuuid(uuid_t uuid, const struct timespec *timeout) 38{ 39 int result; 40 41 result = __gethostuuid(uuid, timeout, 0); 42 if ((result == -1) && (errno == EPERM)) { 43 if (_gethostuuid_callback) { 44 result = _gethostuuid_callback(uuid); 45 } else { 46 /* no fallback, return -1/EPERM */ 47 memset(uuid, 0x00, sizeof(*uuid)); 48 } 49 } 50 51 return result; 52} 53 54/* SPI to call gethostuuid syscall directly, without fallback */ 55int 56_getprivatesystemidentifier(uuid_t uuid, const struct timespec *timeout) 57{ 58 return __gethostuuid(uuid, timeout, 1); 59} 60 61int 62_register_gethostuuid_callback(int (*new_callback)(uuid_t)) 63{ 64 65 if (__sync_bool_compare_and_swap((void **)&_gethostuuid_callback, (void *)0, (void *)new_callback)) { 66 return 0; 67 } else { 68 return EINVAL; 69 } 70} 71