a) The purpose of the code on line 19, i.e., what does this line of code accompl

Question

a) The purpose of the code on line 19, i.e., what does this line of code accomplish?

b) The purpose of the code on lines 21-27 (if statement). Make sure to explain each possibility handled by the if.

4 @author: student namel, student2@uncc.edu 5 author: student name2, student2@uncc.edu 7 @description: A program that demonstrates processes. 9 @course: ITSC 3146 10 @assignment: In-class activity [n] 12 13 14 #include 15 #include«unistd.h> 16 17 int mainOl 18 19 20 21 pid_t id = fork(); if(id 1) { ) else if (id -- 0) std::cout

Explanation / Answer

a) The line- pid_t id = fork() creates or forks a child process for the parent process main(). The process id of the child process is returned to the parent. The child process is an exact duplicate of the parent process but operates in a different memory space.

b) the first if condition- if(id == -1) tests for the failure of the creation of the child process, as -1 will be returned to parent if failure occurs.

the second if condition- if(id == 0) checks if the creation of child process was successful as on successful creation, 0 is returned in child process.

and finally, if any other value other than these two is returned then it means that child process is no more running and we are currently in the parent process.

To print the process id's of these processes you can use the getpid() function.

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