#include <stdlib.h>
#include <stdio.h>

#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

int main (int ac, char **av) {
	int seg, stat;

        if ((seg = shmget (IPC_PRIVATE, 4000, IPC_CREAT| 0600)) == -1) {
                perror("shmget");
                exit (1);
        }
        if (shmat (seg, 0, 0) == (void*) -1) {
                perror ("shmat");
		exit (2);
        }
        if (shmctl (seg, IPC_RMID, NULL) == -1) {
                perror ("shmctl");
		exit (2);
        }
        switch (fork()) {
        case -1:
                perror ("fork");
                return (3);
                
        case 0:
                if (shmat (seg, 0, 0) != (void*) -1)
                        printf ("shmat in client ok\n");
                else
                        perror ("shmat in client failed");
                return (0);
        default:
                wait(&stat);
        }
        exit (0);
}