/* shmonly.c - shmat with nothing else attached. */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/ipc.h>
#include <sys/shm.h>
int main(void) { int i, id; void *p;
  for (i = 0; i < 16; i++) { id = shmget(IPC_PRIVATE, 1<<20, IPC_CREAT|0600); p = shmat(id, 0, 0); shmctl(id, IPC_RMID, 0);
    if (p == (void*)-1) { printf("shmat %2d failed: errno %d %s\n", i+1, errno, strerror(errno)); break; } printf("shmat %2d %p\n", i+1, p); }
  return 0; }