Questions 4. (15 points) Including the initial parent processes, how many proces

Question

Questions 4. (15 points) Including the initial parent processes, how many processes are created by the following program? #include #include int main() pid t pid pid fork(); if (pid 0) { forkf) return 0; lelse if (pid >o) wait(NULL) return 0

Explanation / Answer

The purpose of fork() is to create a new process. It takes no arguments and returns a PID (process ID) of the new process. The process that called fork() is called the parent process and the new process created is called the child process. After a new child process is created, both parent and child processes will execute the next instruction following the fork(). fork() call returns a 0 to parent process and a non-negative number to the child process, which is PID of child process. So pid = fork(); #1 if (pid == 0) { #2 fork(); #3 return 0; } else if(pid > 0) { #4 wait(NULL); return 0; } a. if original process is P, Line #1 creates a new Process P1. Then Line #2 allows only the parent process, which creates a new process P2 at line 3. Process P1 starts at line 4 and enters the block. Procee P2 starts at line 3 and returns. So total of 3 processes have been created by the program. Note that, line #5 will be executed by all of the above processes.

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