writerprocess

#include <stdio.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>

int main() {
    // Generate unique key
    key_t key = ftok("shmfile", 65);
    if (key == -1) {
        perror("ftok");
        return 1;
    }

    // Create shared memory segment
    int shmid = shmget(key, 1024, 0666 | IPC_CREAT);
    if (shmid == -1) {
        perror("shmget");
        return 1;
    }

    // Attach to shared memory
    char *str = (char*)shmat(shmid, (void*)0, 0);
    if (str == (char*)(-1)) {
        perror("shmat");
        return 1;
    }

    // Write data to shared memory
    printf("Write Data : ");
    fgets(str, 1024, stdin);
    // Remove the newline character added by fgets
    str[strcspn(str, "\n")] = 0;

    printf("Data written in memory: %s\n", str);

    // Detach from shared memory
    if (shmdt(str) == -1) {
        perror("shmdt");
        return 1;
    }

    return 0;
}