60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/*
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* Copyright 2019 Intel Corporation
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* SPDX-License-Identifier: MIT
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*
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* File operations helpers
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*/
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#ifndef _OS_FILE_H_
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#define _OS_FILE_H_
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#include <stdbool.h>
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#include <stdio.h>
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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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* Create a new file and opens it for writing-only.
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* If the given filename already exists, nothing is done and NULL is returned.
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* `errno` gets set to the failure reason; if that is not EEXIST, the caller
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* might want to do something other than trying again.
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*/
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FILE *
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os_file_create_unique(const char *filename, int filemode);
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/*
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* Duplicate a file descriptor, making sure not to keep it open after an exec*()
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*/
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int
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os_dupfd_cloexec(int fd);
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/*
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* Read a file.
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* Returns a char* that the caller must free(), or NULL and sets errno.
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* If size is not null and no error occurred it's set to the size of the
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* file.
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* Reads files as binary and includes a NUL terminator after the end of the
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* returned buffer.
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*/
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char *
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os_read_file(const char *filename, size_t *size);
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/*
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* Try to determine if two file descriptors reference the same file description
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*
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* Return values:
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* - 0: They reference the same file description
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* - > 0: They do not reference the same file description
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* - < 0: Unable to determine whether they reference the same file description
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*/
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int
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os_same_file_description(int fd1, int fd2);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _OS_FILE_H_ */
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