1 /*
2 * Copyright 2012, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef _PORTABILITY_H_
18 #define _PORTABILITY_H_
19
20 #include "asm-generic/portability.h"
21 /*
22 * Common portability helper routines
23 */
24
25 /*
26 * Check a portable pointer before we access it
27 * Well behaved programs should not be passing bad pointers
28 * to the kernel but this routine can be used to check a pointer
29 * if we need to use it before calling the kernel
30 *
31 * It does not catch every possible case but it is sufficient for LTP
32 */
invalid_pointer(void * p)33 inline static int invalid_pointer(void *p)
34 {
35 return p == 0
36 || p == (void *)-1
37 #ifdef __mips__
38 || (int)p < 0
39 #endif
40 ;
41 }
42
43 /*
44 * Hidden functions are exposed while linking the libportable shared object
45 * but are not exposed thereafter.
46 */
47 #define __hidden __attribute__((visibility("hidden")))
48
49 #endif /* _PORTABILITY_H_ */
50