814640315a
Certain apps decide that they want to chmod() their private data directories to gain more security. We still want to carefully enforce owner UID/GID, but relax the mode check for now. Bug: 26549892 Change-Id: I362d530ba0b20fb23f427ac082ee003864adc57d
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CUTILS_FS_H
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#define __CUTILS_FS_H
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#include <sys/types.h>
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#include <unistd.h>
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/*
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* TEMP_FAILURE_RETRY is defined by some, but not all, versions of
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* <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
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* not already defined, then define it here.
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*/
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#ifndef TEMP_FAILURE_RETRY
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/* Used to retry syscalls that can return EINTR. */
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#define TEMP_FAILURE_RETRY(exp) ({ \
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typeof (exp) _rc; \
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do { \
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_rc = (exp); \
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} while (_rc == -1 && errno == EINTR); \
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_rc; })
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Ensure that directory exists with given mode and owners. If it exists
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* with a different mode or owners, they are fixed to match the given values.
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*/
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extern int fs_prepare_dir(const char* path, mode_t mode, uid_t uid, gid_t gid);
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/*
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* Ensure that directory exists with given mode and owners. If it exists
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* with different owners, they are not fixed and -1 is returned.
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*/
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extern int fs_prepare_dir_strict(const char* path, mode_t mode, uid_t uid, gid_t gid);
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/*
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* Read single plaintext integer from given file, correctly handling files
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* partially written with fs_write_atomic_int().
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*/
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extern int fs_read_atomic_int(const char* path, int* value);
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/*
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* Write single plaintext integer to given file, creating backup while
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* in progress.
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*/
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extern int fs_write_atomic_int(const char* path, int value);
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/*
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* Ensure that all directories along given path exist, creating parent
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* directories as needed. Validates that given path is absolute and that
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* it contains no relative "." or ".." paths or symlinks. Last path segment
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* is treated as filename and ignored, unless the path ends with "/".
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*/
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extern int fs_mkdirs(const char* path, mode_t mode);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __CUTILS_FS_H */
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