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