blob: 3f461a0eee38f2f0bb5fa665363b429a5ea59e55 [file] [log] [blame] [edit]
/*
* Copyright (c) 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
int main(void) {
char *buf;
int fd, ret;
unsigned int i;
fd = open("/dev/zero", O_RDONLY);
if (fd < 0)
return 1;
buf = mmap(NULL, 4096, PROT_READ, MAP_PRIVATE, fd, 0);
if (buf == (char *)-1)
return 2;
for (i = 0; i < 4096; i++) {
if (buf[i] != 0)
return 3;
}
ret = munmap(buf, 4096);
if (ret < 0)
return 4;
ret = close(fd);
if (ret < 0)
return 5;
return 0;
}