CS3413/Assignment2/main.c

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <wait.h>

void print_prompt() {
    printf("[%d]> ", getpid());
}

int main() {
    bool is_looping = true;
    // Listen loop
    while (is_looping) {
        char input[100];
        print_prompt();
       fgets(input, 100, stdin);
        if (strcmp(input, "stop\n") == 0) {
            is_looping = false;
        }
        if (strcmp(input, "onechild\n") == 0) {
            if(fork() == 0) {
                print_prompt();
                printf("Hello, I am a child process\n");
                exit(0);
            }
            else {
                print_prompt();
                printf("Hello, I am a parent process\n");
                wait(NULL);
            }
        }
        if (strcmp(input, "addnumbers\n") == 0) {
            int number = 1;
            int send_to_child[2];
            int receive_from_child[2];
            pipe(send_to_child);
            pipe(receive_from_child);

            if (fork() == 0) {
                int subtotal = 0;
                while (number != 0) {
                    // Read the numbers from the send_to_child pipe
                    read(send_to_child[0], &number, sizeof(int));
                    subtotal += number;
                    print_prompt();
                    printf("The subtotal is %d\n", subtotal);
                    // Write the sum to the receive_from_child pipe
                    write(receive_from_child[1], &subtotal, sizeof(int));
                }
                exit(0);
            }
            else {
                int total = 0;
                while (number != 0) {

                    print_prompt();
                    printf("Please input a number, 0 to terminate:  ");
                    char buffer[100];
                    fgets(buffer, 100, stdin);
                    number = atoi(buffer);
                    print_prompt();
                    printf("You entered %d\n", number);
                    write(send_to_child[1], &number, sizeof(int));
                    read(receive_from_child[0], &total, sizeof(int));
                }
                print_prompt();
                printf("The total is %d\n", total);
            }
        }
    }
}

void temp() {
    char input[5][100];
    char buffer[500];
    //Print prompt
    print_prompt();
    if (fgets(buffer, 500, stdin) == NULL) {
        exit(0);
    }
    //split buffer on spaces into input array
    sscanf(buffer, "%s %s %s %s %s", input[0], input[1], input[2], input[3], input[4]);
};