Jeff Sharkey | 9685194 | 2012-08-27 15:03:37 -0700 | [diff] [blame] | 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 | |
Jeff Sharkey | ddb1733 | 2012-09-13 14:47:23 -0700 | [diff] [blame] | 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 | |
Jeff Sharkey | 9685194 | 2012-08-27 15:03:37 -0700 | [diff] [blame] | 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 | |
Jeff Sharkey | 44d6342 | 2013-09-12 09:44:48 -0700 | [diff] [blame] | 58 | /* |
| 59 | * Ensure that all directories along given path exist, creating parent |
| 60 | * directories as needed. Validates that given path is absolute and that |
| 61 | * it contains no relative "." or ".." paths or symlinks. Last path segment |
| 62 | * is treated as filename and ignored, unless the path ends with "/". |
| 63 | */ |
| 64 | extern int fs_mkdirs(const char* path, mode_t mode); |
| 65 | |
Jeff Sharkey | 9685194 | 2012-08-27 15:03:37 -0700 | [diff] [blame] | 66 | #ifdef __cplusplus |
| 67 | } |
| 68 | #endif |
| 69 | |
| 70 | #endif /* __CUTILS_FS_H */ |