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/* Detecting file changes using modification times.
Copyright (C) 2017-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _FILE_CHANGE_DETECTION_H
#define _FILE_CHANGE_DETECTION_H
#include <stdbool.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
/* Items for identifying a particular file version. Excerpt from
struct stat64. */
struct file_change_detection
{
/* Special values: 0 if file does not exist. -1 to force mismatch
with the next comparison. */
off64_t size;
ino64_t ino;
struct __timespec64 mtime;
struct __timespec64 ctime;
};
/* Returns true if *LEFT and *RIGHT describe the same version of the
same file. */
bool __file_is_unchanged (const struct file_change_detection *left,
const struct file_change_detection *right);
/* Extract file change information to *FILE from the stat buffer
*ST. */
void __file_change_detection_for_stat (struct file_change_detection *file,
const struct __stat64_t64 *st);
/* Writes file change information for PATH to *FILE. Returns true on
success. For benign errors, *FILE is cleared, and true is
returned. For errors indicating resource outages and the like,
false is returned. */
bool __file_change_detection_for_path (struct file_change_detection *file,
const char *path);
/* Writes file change information for the stream FP to *FILE. Returns
ture on success, false on failure. If FP is NULL, treat the file
as non-existing. */
bool __file_change_detection_for_fp (struct file_change_detection *file,
FILE *fp);
#ifndef _ISOMAC
libc_hidden_proto (__file_is_unchanged)
libc_hidden_proto (__file_change_detection_for_stat)
libc_hidden_proto (__file_change_detection_for_path)
libc_hidden_proto (__file_change_detection_for_fp)
#endif
#endif /* _FILE_CHANGE_DETECTION_H */
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