S01_PAMIEC_DZIELONA_01

/*
Zademonstruj u ż ycie przez program prywatnego obszaru pami ę ci dzielonej.
*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <string.h>

#define SEGMENT_SIZE 128
#define MESSAGE_TO_STORE "Jakas wiadomosc"

int main(void)
{
    int shmid;
    char *shared_memory;

    if((shmid = shmget(IPC_PRIVATE, SEGMENT_SIZE, 0775 | IPC_CREAT | IPC_EXCL)) == -1){
        perror("shmget");
        return EXIT_FAILURE;
    }

    if((shared_memory = shmat(shmid, NULL, 0)) == (char *)-1){
        perror("shmat");
        return EXIT_FAILURE;
    }

    strncpy(shared_memory, MESSAGE_TO_STORE, strlen(MESSAGE_TO_STORE));

    printf("Napis w pamieci dzielonej: %s\n", shared_memory);

    if(shmdt(shared_memory) == -1){
        perror("shmdt");
        return EXIT_FAILURE;
    }

    if(shmctl(shmid, 0, IPC_RMID) == -1){
        perror("shmctl");
        return EXIT_FAILURE;
    }


    return EXIT_SUCCESS;
}