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 
main()10 int 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