[SO] Pamięć współdzielona 05-12-2017

#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/sem.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/ipc.h>
#include <sys/shm.h>

int shmCreate(key_t key, int sizeInBytes)
{
    int semId = shmget(key,sizeInBytes,IPC_CREAT|IPC_EXCL|0700);
    if(semId == -1)
    {
        perror("Blad tworzenia");
        exit(1);
    }
    return semId;
}
int shmOpen(key_t key)
{
    int semId=shmget(key,0,0700);
    if(semId == -1)
    {
        perror("Blad otwarcia");
        exit(1);
    }
    return semId;
}
void shmRemove(int shmid)
{
    if(shmctl(shmid,IPC_RMID,NULL) == -1)
    {
        perror("Blad usuniecia");
        exit(1);
    }
}
void *shmAt(int shmid)
{
    int* score=shmat(shmid,NULL,0);
    if(*score == -1)
    {
        perror("Blad at");
        exit(1);
    }
    return shmat(shmid,NULL,0);
}
void shmDt(void*addr)
{
    if(shmdt(addr) == -1)
    {
        perror("Blad dt");
        exit(1);
    }
}




#include "pamiecwspoldzielona.h"

int main()//-zapis
{
    key_t key =  ftok(".",0);
    int a=shmCreate(key,sizeof(long double));
    long double *bufor;
    bufor=(long double*)shmAt(a);
    *bufor=69.696969;
    shmDt(bufor);
    return 0;
}




#include "pamiecwspoldzielona.h"


int main()//-odczyt
{
    key_t key =  ftok(".",0);
    int a=shmOpen(key);
    long double*b=shmAt(a);
    printf("%Lf\n",*b);
    shmDt(b);
    shmRemove(a);
    return 0;
}