1#define _GNU_SOURCE
2#include <stdio.h>
3#include <stdlib.h>
4#include <assert.h>
5#include <sys/ipc.h>
6#include <sys/shm.h>
7#include <sys/stat.h>
8#include <sys/mman.h>
9
10int main()
11{
12  int shmid = shmget(IPC_PRIVATE, 100 * 4096,
13                     IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR);
14  assert(shmid != -1);
15
16  void *addr = shmat(shmid, NULL, 0);
17  assert(addr != (void *)-1);
18
19  addr = mremap(addr, 100 * 4096, 40 * 4096, 0);
20  assert(addr != (void *)-1);
21
22  return 0;
23}
24