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1 | /* |
2 | * Copyright (C) 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 __CUTILS_FS_H | |
18 | #define __CUTILS_FS_H | |
19 | ||
20 | #include <sys/types.h> | |
21 | ||
22 | /* | |
23 | * TEMP_FAILURE_RETRY is defined by some, but not all, versions of | |
24 | * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's | |
25 | * not already defined, then define it here. | |
26 | */ | |
27 | #ifndef TEMP_FAILURE_RETRY | |
28 | /* Used to retry syscalls that can return EINTR. */ | |
29 | #define TEMP_FAILURE_RETRY(exp) ({ \ | |
30 | typeof (exp) _rc; \ | |
31 | do { \ | |
32 | _rc = (exp); \ | |
33 | } while (_rc == -1 && errno == EINTR); \ | |
34 | _rc; }) | |
35 | #endif | |
36 | ||
37 | #ifdef __cplusplus | |
38 | extern "C" { | |
39 | #endif | |
40 | ||
41 | /* | |
42 | * Ensure that directory exists with given mode and owners. | |
43 | */ | |
44 | extern int fs_prepare_dir(const char* path, mode_t mode, uid_t uid, gid_t gid); | |
45 | ||
46 | /* | |
47 | * Read single plaintext integer from given file, correctly handling files | |
48 | * partially written with fs_write_atomic_int(). | |
49 | */ | |
50 | extern int fs_read_atomic_int(const char* path, int* value); | |
51 | ||
52 | /* | |
53 | * Write single plaintext integer to given file, creating backup while | |
54 | * in progress. | |
55 | */ | |
56 | extern int fs_write_atomic_int(const char* path, int value); | |
57 | ||
58 | #ifdef __cplusplus | |
59 | } | |
60 | #endif | |
61 | ||
62 | #endif /* __CUTILS_FS_H */ |