* Copyright 2023, Trung Nguyen, trungnt282910@gmail.com.
* Distributed under the terms of the MIT License.
*/
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
int
main()
{
char tmpfile[] = "/tmp/mmap_fixed_test_XXXXXX";
int fd = mkstemp(tmpfile);
if (fd < 0) {
printf("cannot create temporary file.\n");
return -1;
}
unlink(tmpfile);
ftruncate(fd, 4096);
void* addr = mmap(NULL, 4096, PROT_NONE, MAP_SHARED, fd, 0);
void* addr1 = mmap(addr, 4096, PROT_NONE, MAP_SHARED | MAP_FIXED, fd, 0);
if (addr == MAP_FAILED || addr1 == MAP_FAILED) {
printf("mmap failed.\n");
return -1;
}
if (addr != addr1) {
printf("MAP_FIXED did not return same address.\n");
return -1;
}
return 0;
}
