Shared memory creation-chatgpt

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

#define SHM_SIZE 1024  // Size of shared memory segment

int main() {
    int shmid;
    key_t key;
    char *shm, *s;

    // Generate a unique key for the shared memory segment
    key = ftok(".", 'a');

    // Create the shared memory segment
    shmid = shmget(key, SHM_SIZE, IPC_CREAT | 0666);
    if (shmid == -1) {
        perror("shmget");
        exit(1);
    }

    // Attach the shared memory segment
    shm = shmat(shmid, NULL, 0);
    if (shm == (char *) -1) {
        perror("shmat");
        exit(1);
    }

    // Write to the shared memory segment
    s = shm;
    for (char c = 'a'; c <= 'z'; c++) {
        *s++ = c;
    }
    *s = '\0'; // Null-terminate the string

    // Wait for the other process to read the data
    while (*shm != '*') {
        sleep(1);
    }

    // Detach the shared memory segment
    if (shmdt(shm) == -1) {
        perror("shmdt");
        exit(1);
    }

    // Delete the shared memory segment
    if (shmctl(shmid, IPC_RMID, NULL) == -1) {
        perror("shmctl");
        exit(1);
    }

    return 0;
}