1 /* Declare an access pattern hint for files.
2 Copyright (C) 2010-2023 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Without this pragma, gcc suggests that (given !HAVE_POSIX_FADVISE)
18 the fdadvise function might be a candidate for attribute 'const'. */
19 #if (__GNUC__ == 4 && 6 <= __GNUC_MINOR__) || 4 < __GNUC__
20 # pragma GCC diagnostic ignored "-Wsuggest-attribute=const"
21 #endif
22
23 #include <config.h>
24 #include "fadvise.h"
25
26 #include <stdio.h>
27 #include <fcntl.h>
28 #include "ignore-value.h"
29
30 void
fdadvise(int fd,off_t offset,off_t len,fadvice_t advice)31 fdadvise (int fd, off_t offset, off_t len, fadvice_t advice)
32 {
33 #if HAVE_POSIX_FADVISE
34 ignore_value (posix_fadvise (fd, offset, len, advice));
35 #endif
36 }
37
38 void
fadvise(FILE * fp,fadvice_t advice)39 fadvise (FILE *fp, fadvice_t advice)
40 {
41 if (fp)
42 fdadvise (fileno (fp), 0, 0, advice);
43 }
44