cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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huge_count_read_write.c (711B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Author: SeongJae Park <sj@kernel.org>
      4 */
      5
      6#include <fcntl.h>
      7#include <stdlib.h>
      8#include <unistd.h>
      9#include <stdio.h>
     10
     11void write_read_with_huge_count(char *file)
     12{
     13	int filedesc = open(file, O_RDWR);
     14	char buf[25];
     15	int ret;
     16
     17	printf("%s %s\n", __func__, file);
     18	if (filedesc < 0) {
     19		fprintf(stderr, "failed opening %s\n", file);
     20		exit(1);
     21	}
     22
     23	write(filedesc, "", 0xfffffffful);
     24	perror("after write: ");
     25	ret = read(filedesc, buf, 0xfffffffful);
     26	perror("after read: ");
     27	close(filedesc);
     28}
     29
     30int main(int argc, char *argv[])
     31{
     32	if (argc != 2) {
     33		fprintf(stderr, "Usage: %s <file>\n", argv[0]);
     34		exit(1);
     35	}
     36	write_read_with_huge_count(argv[1]);
     37
     38	return 0;
     39}