text: /*
   * Copyright (C) 2012 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef __CUTILS_FS_H
  #define __CUTILS_FS_H
  
  #include <sys/types.h>
  
  /*
   * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
   * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
   * not already defined, then define it here.
   */
  #ifndef TEMP_FAILURE_RETRY
  /* Used to retry syscalls that can return EINTR. */
  #define TEMP_FAILURE_RETRY(exp) ({         \
      typeof (exp) _rc;                      \
      do {                                   \
          _rc = (exp);                       \
      } while (_rc == -1 && errno == EINTR); \
      _rc; })
  #endif
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /*
   * Ensure that directory exists with given mode and owners.
   */
  extern int fs_prepare_dir(const char* path, mode_t mode, uid_t uid, gid_t gid);
  
  /*
   * Read single plaintext integer from given file, correctly handling files
   * partially written with fs_write_atomic_int().
   */
  extern int fs_read_atomic_int(const char* path, int* value);
  
  /*
   * Write single plaintext integer to given file, creating backup while
   * in progress.
   */
  extern int fs_write_atomic_int(const char* path, int value);
  
  /*
   * Ensure that all directories along given path exist, creating parent
   * directories as needed.  Validates that given path is absolute and that
   * it contains no relative "." or ".." paths or symlinks.  Last path segment
   * is treated as filename and ignored, unless the path ends with "/".
   */
  extern int fs_mkdirs(const char* path, mode_t mode);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* __CUTILS_FS_H */
  