71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
/* Detecting file changes using modification times.
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Copyright (C) 2017-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _FILE_CHANGE_DETECTION_H
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#define _FILE_CHANGE_DETECTION_H
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#include <stdbool.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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/* Items for identifying a particular file version. Excerpt from
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struct stat64. */
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struct file_change_detection
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{
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/* Special values: 0 if file does not exist. -1 to force mismatch
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with the next comparison. */
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off64_t size;
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ino64_t ino;
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struct __timespec64 mtime;
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struct __timespec64 ctime;
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};
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/* Returns true if *LEFT and *RIGHT describe the same version of the
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same file. */
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bool __file_is_unchanged (const struct file_change_detection *left,
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const struct file_change_detection *right);
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/* Extract file change information to *FILE from the stat buffer
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*ST. */
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void __file_change_detection_for_stat (struct file_change_detection *file,
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const struct __stat64_t64 *st);
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/* Writes file change information for PATH to *FILE. Returns true on
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success. For benign errors, *FILE is cleared, and true is
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returned. For errors indicating resource outages and the like,
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false is returned. */
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bool __file_change_detection_for_path (struct file_change_detection *file,
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const char *path);
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/* Writes file change information for the stream FP to *FILE. Returns
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ture on success, false on failure. If FP is NULL, treat the file
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as non-existing. */
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bool __file_change_detection_for_fp (struct file_change_detection *file,
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FILE *fp);
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#ifndef _ISOMAC
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libc_hidden_proto (__file_is_unchanged)
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libc_hidden_proto (__file_change_detection_for_stat)
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libc_hidden_proto (__file_change_detection_for_path)
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libc_hidden_proto (__file_change_detection_for_fp)
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#endif
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#endif /* _FILE_CHANGE_DETECTION_H */
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