Chapter 8.4, Problem 8.2PP

A.

Program Plan Intro

Given code:

//Include the necessary header files

#include <stdio.h>

#include "csapp.h"

//Define a main()

int main()

{

//Initialize the variable x as 1

int x=1;

//Check the condition

if(fork()==0)

//Print the statement

printf("p1: x=%d\n", ++x);

//Print the statement

printf("p2: x=%d\n", --x);

//Exit

exit(0);

}

Explanation:

The given code is used to print the output of the child and parent processes.

In the given code, the main program initializes the variable “x” as “1”.

• The “if” condition check, function “fork()” is equal to zero.
  • Condition is true, print the value of “x” by incrementing “1”. So, the value of “x” becomes “2”.
• Otherwise, print the value of “x” by decrementing “1”. So, the value of “x” becomes “1”.
• Exit from the program.

B.

Explanation of Solution

Output of the parent process:

P2: x = 0

Explanation:

In the given code, the main program initializes the variable “x” as “1”.

• The parent process check the condition, if the function “fork()” is equal to zero...