40 lines
711 B
C
40 lines
711 B
C
// 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;
|
|
}
|