IPC pipe

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define BUFFER_SIZE 100

int main() {
    int fd[2]; // File descriptors for the pipe
    pid_t pid;
    char write_msg[BUFFER_SIZE] = "Hello from parent process!";
    char read_msg[BUFFER_SIZE];

    // Create the pipe
    if (pipe(fd) == -1) {
        perror("pipe");
        exit(EXIT_FAILURE);
    }

    // Fork a child process
    pid = fork();

    if (pid < 0) {
        perror("fork");
        exit(EXIT_FAILURE);
    }

    if (pid > 0) { // Parent process
        close(fd[0]); // Close the read end of the pipe

        // Write to the pipe
        write(fd[1], write_msg, strlen(write_msg) + 1);

        close(fd[1]); // Close the write end of the pipe
    } else { // Child process
        close(fd[1]); // Close the write end of the pipe

        // Read from the pipe
        read(fd[0], read_msg, BUFFER_SIZE);

        printf("Child process received message: %s\n", read_msg);

        close(fd[0]); // Close the read end of the pipe
    }

    return 0;
}