What's the initiation value of variable a to d? int child task(int read_pipe, int write_pipe) {char to_msg(25);char from_msg() = "This is your child.";if (read(read_pipe, to_msg, 25) != -1) {printf("message: *s\n", to_msg);if (write(write_pipe, from_msg, strlen(trom_msg) + 1) != -1) {printt("Sent: %s\n", from_msg);return e;int parent_task(int read_pipe, int write_pipe) {char to_msg(25);char trom_msg(] = "Who are you?";if (write(write_pipe, from_msg, strlen(trom_msg) + 1) != -1) {printf("Sent: %s\n", from_msg);if (read(read_pipe, to_msg, 25) != -1) {printf("message: %s\n", to_msg);return e:Given the two tunctions above, we try to write the following code in the mainfunction.int parent_to_child_pipe(2);int child to_parent_pipe(2];int a, b, c, d, e, f, 9, h;if (pipe(parent_to_child_pipe) == -1) exit{1);if (pipe(child_to_parent_pipe) == -1) exit(1);pid_t pid;if ((pid = tork()) = 0) {close(parent_to_child_pipe(a]);close(child_to_parent_pipe (b]);int ret = child_task(parent_to_child_pipe(c], child_to_parent_pipe(d]);exit(ret);} else {close(parent_to_child_pipe (e]);close(child_to_parent_pipe(t]);parent_task(child to_parent_pipe(g), parent_to_child_pipe (h));wait (NULL);printf("parent process comp leting. \n");exit (0);

The basic idea behind the creation of pipe is to have the inter process communication between two…

Answered: if ((pid - fork)) - 0) {…

if ((pid - fork)) - 0) { close(parent_to_child_pipe(a]); close(child_to_parent_pipe (b)); int ret - child_task(parent_to_child_pipe(c), child to_parent_pipe(d]); exit(ret);

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

What's the initiation value of variable a to d?

int child task(int read_pipe, int write_pipe) {
char to_msg(25);
char from_msg() = "This is your child.";
if (read(read_pipe, to_msg, 25) != -1) {
printf("message: *s\n", to_msg);
if (write(write_pipe, from_msg, strlen(trom_msg) + 1) != -1) {
printt("Sent: %s\n", from_msg);
return e;
int parent_task(int read_pipe, int write_pipe) {
char to_msg(25);
char trom_msg(] = "Who are you?";
if (write(write_pipe, from_msg, strlen(trom_msg) + 1) != -1) {
printf("Sent: %s\n", from_msg);
if (read(read_pipe, to_msg, 25) != -1) {
printf("message: %s\n", to_msg);
return e:
Given the two tunctions above, we try to write the following code in the main
function.
int parent_to_child_pipe(2);
int child to_parent_pipe(2];
int a, b, c, d, e, f, 9, h;
if (pipe(parent_to_child_pipe) == -1) exit{1);
if (pipe(child_to_parent_pipe) == -1) exit(1);
pid_t pid;
if ((pid = tork()) = 0) {
close(parent_to_child_pipe(a]);
close(child_to_parent_pipe (b]);
int ret = child_task(parent_to_child_pipe(c], child_to_parent_pipe(d]);
exit(ret);
} else {
close(parent_to_child_pipe (e]);
close(child_to_parent_pipe(t]);
parent_task(child to_parent_pipe(g), parent_to_child_pipe (h));
wait (NULL);
printf("parent process comp leting. \n");
exit (0);

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