1/*
2 * Copyright (c) 2010 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_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. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29#include <TargetConditionals.h>
30#include <stddef.h>
31#include <stdint.h>
32#include "tsd.h"
33
34/*
35 * cerror takes the return value of the syscall, being non-zero, and
36 * stores it in errno. It needs to return -1 to indicate failure but
37 * 64-bit platforms need to ensure that possible 128-bit wide return
38 * values are also properly set.
39 */
40#ifdef __LP64__
41typedef unsigned __int128 cerror_return_t;
42#else
43typedef uint64_t cerror_return_t;
44#endif
45
46extern void _pthread_exit_if_canceled(int error);
47
48#undef errno
49int errno;
50
51int *
52__error(void)
53{
54	void *ptr = _os_tsd_get_direct(__TSD_ERRNO);
55	if (ptr != NULL) {
56		return (int*)ptr;
57	}
58	return &errno;
59}
60
61__attribute__((noinline))
62cerror_return_t
63cerror_nocancel(int err)
64{
65	errno = err;
66	int *tsderrno = (int*)_os_tsd_get_direct(__TSD_ERRNO);
67	if (tsderrno) {
68		*tsderrno = err;
69	}
70	return -1;
71}
72
73__attribute__((noinline))
74cerror_return_t
75cerror(int err)
76{
77	_pthread_exit_if_canceled(err);
78	return cerror_nocancel(err);
79}
80
81#if !TARGET_OS_EMBEDDED
82
83// Internal symbol no longer used by anybody in Libsystem but required for
84// backwards compatibility with 3rd parties <rdar://problem/14380572>
85
86void
87cthread_set_errno_self(int err, int nocancel)
88{
89	asm(".global $ld$hide$os10.9$_cthread_set_errno_self\n\t"
90		".set $ld$hide$os10.9$_cthread_set_errno_self, _cthread_set_errno_self");
91	if (nocancel) {
92		cerror_nocancel(err);
93	} else {
94		cerror(err);
95	}
96}
97
98#endif
99