Question

Problem la Points (20) Draw the process tree for the program shown below. #include<sys/types.h> #include<stdio.h> #include<unistd.h> int value = 5; int main() pid_t pid; pid = forko; if(pid ==0) { */ Child Process */ forkO; value += 15; return 0; else if (pid > 0) {/* Parent process */ forkO; forkO; wait(NULL); printf("Parent: value = %d", value); /* LINE A */ return 0;

Answer 1

The fork() system call is used to create a new process.

when we execute the fork statement it creates two processes, one child and parent

When we call fork() which return 3 possible values

1) value >0 , indicate parent process

2) value = 0, indicate child process

3) value <0, error

Problem la Points (20) Draw the process tree for the program shown below. #include<sys/types.h> #include<stdio.h> #include<unistd.h> int value = 5; int main() // P pid_t pid; pid = fork(); // f1 if(pid == 0) { */Child Process * fork0; // f2 value += 15; return 0; else if (pid > 0) { /* Parent process */ fork0; // f3 fork(); // 14 wait(NULL); printf("Parent: value = %d", value); /* LINE A */ return 0;

The following figure shows the process tree for the given program.

P is the main process