1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <errno.h>
30
31 // This function is called from our assembler syscall stubs.
32 // C/C++ code should just assign 'errno' instead.
33
34 // The return type is 'long' because we use the same routine in calls
35 // that return an int as in ones that return a ssize_t. On a 32-bit
36 // system these are the same size, but on a 64-bit system they're not.
37 // 'long' gives us 32-bit on 32-bit systems, 64-bit on 64-bit systems.
38
39 // Since __set_errno was mistakenly exposed in <errno.h> in the 32-bit
40 // NDK, use a differently named internal function for the system call
41 // stubs. This avoids having the stubs .hidden directives accidentally
42 // hide __set_errno for old NDK apps.
43
44 // This one is for internal use only and used by both LP32 and LP64 assembler.
__set_errno_internal(int n)45 extern "C" __LIBC_HIDDEN__ long __set_errno_internal(int n) {
46 errno = n;
47 return -1;
48 }
49