Shared Memory in C (Linux)

sharedmemory.c

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

int main()
{
    char* shared_memory;
    int segment_id;
    
    const int size = 4096; //byte
    
    //allocates shared memory segment and return its identifier as an integer
    segment_id = shmget(IPC_PRIVATE, size, S_IWUSR | S_IRUSR);
    
    //attaches the shared memory segment to the address space of process and returns the address
    shared_memory = (char *) shmat(segment_id, NULL, 0);
    
    //Write operation
    sprintf(shared_memory, "In shared Memory \n");
    
    //Read Operation
    printf("Reading  ---> %s\n", shared_memory);
    
    //detaches the shared memory segment from the address sapce of process
    shmdt(shared_memory);
    
    //removes the shared memory segment
    shmctl(segment_id, IPC_RMID, NULL);
    
    return 0;
}