none/tests/linux/mremap5.c

   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
  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, 400 * 4096, MREMAP_MAYMOVE);
  20   assert(addr != (void *)-1);
  21
  22   return 0;
  23 }