Shared memory reading-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 the same unique key used by the other program
    key = ftok(".", 'a');

    // Locate the shared memory segment
    shmid = shmget(key, SHM_SIZE, 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);
    }

    // Read from the shared memory segment
    for (s = shm; *s != '\0'; s++) {
        putchar(*s);
    }
    putchar('\n');

    // Signal to the other process that we've finished reading
    *shm = '*';

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

    return 0;
}