blob: ad7a6b4cf33876c0bc378084bd1fe30e2ccbd951 (
plain) (
blame)
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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Author: SeongJae Park <sj@kernel.org>
*/
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
void write_read_with_huge_count(char *file)
{
int filedesc = open(file, O_RDWR);
char buf[25];
int ret;
printf("%s %s\n", __func__, file);
if (filedesc < 0) {
fprintf(stderr, "failed opening %s\n", file);
exit(1);
}
write(filedesc, "", 0xfffffffful);
perror("after write: ");
ret = read(filedesc, buf, 0xfffffffful);
perror("after read: ");
close(filedesc);
}
int main(int argc, char *argv[])
{
if (argc != 2) {
fprintf(stderr, "Usage: %s <file>\n", argv[0]);
exit(1);
}
write_read_with_huge_count(argv[1]);
return 0;
}
|
