shared-memory/src/SharedMemory.cpp

#include <cstdlib>
#include <sys/ipc.h>
#include <sys/shm.h>
#include "SharedMemory.h"
#include <iostream>
#define Max_Memory_Size 8000

int memoryAccessKey = 12345;
int memID;

void sharedMemoryInit() {
    if ((memID = shmget(memoryAccessKey, Max_Memory_Size, IPC_CREAT | IPC_EXCL | 0666)) < 0) {
        std::cerr << "Shared memory with Key: " << memoryAccessKey
                  << " already exists. Delete by Hand before starting vKFM" << std::endl;
        exit(0);
    } else {
        std::cout << "Shared memory with Key: " << memoryAccessKey << " allocated" << std::endl;
    }
}


void deleteSharedMemory(int s)
{
    if (shmctl(memID, IPC_RMID, NULL) < 0 )
    {
        std::cerr << "Failed to remove shared Memory, maybe not existing: try cmd: ipcs " << std::endl;
    } else {
        std::cout << "shared Memory deleted" << std::endl;
    }
    exit(0);
}

void deleteSharedMemory(void)
{
    if (shmctl(memID, IPC_RMID, NULL) < 0 )
    {
        std::cerr << "Failed to remove shared Memory, maybe not existing: try cmd: ipcs " << std::endl;
    } else {
        std::cout << "shared Memory deleted" << std::endl;
    }
    exit(0);
}