1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/* Test that fadvise works as advertised.
Copyright (C) 2010-2020 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Pádraig Brady. */
#include <config.h>
#include <stdio.h>
#include "fadvise.h"
/* We ignore any errors as these hints are only advisory.
* There is the chance one can pass invalid ADVICE, which will
* not be indicated, but given the simplicity of the interface
* this is unlikely. Also not returning errors allows the
* unconditional passing of descriptors to non standard files,
* which will just be ignored if unsupported. */
int
main (void)
{
/* Valid. */
fadvise (stdin, FADVISE_SEQUENTIAL);
fdadvise (fileno (stdin), 0, 0, FADVISE_RANDOM);
/* Ignored. */
fadvise (NULL, FADVISE_RANDOM);
/* Invalid. */
fdadvise (42, 0, 0, FADVISE_RANDOM);
/* Unfortunately C enums are not types.
One could hack type safety by wrapping in a struct,
but it's probably not worth the complexity in this case. */
fadvise (stdin, FADVISE_SEQUENTIAL + FADVISE_RANDOM);
fadvise (stdin, 4242);
return 0;
}
|
