UNIX for Advanced & Expert Users

#include <stdio.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <ctype.h>

int main(){
    int segment_id = 456456;    /* let's asume i know the ID of the shared mem. segment    */
    struct shmid_ds buffer;

    /* dovuci podatke o segmentu*/
    if(shmctl(segment_id, IPC_STAT, &buffer) != 0){
        printf("shit\n");
        exit(-1);
    }

    printf("owner: %d\n", buffer.shm_perm.uid); /* ok*/
    printf("size: %d \n", buffer.shm_segsz); /* NOT OK */
    printf("# of attaches: %d \n", buffer.shm_nattch); /* NOT OK */

    return 0;
}