Which of the following system calls does not return control to the calling point, on termination?Select one:a. execb. forkc. waitd. ioctl

estion: What is the purpose of the "fork" system call in Unix-like operating systems?A) To create a new processB) To terminate a processC) To wait f

Consider the following fragment of a program: ... int a=0; int main() { a = 1; int pid=fork(); if(pid == 0) { printf("%d\n", a); } else if(pid > 0) { printf("%d\n", a); } return 0; } When run, what output do you observe and what do you think is the reason for the observed output? You may assume that the call to fork() succeeds. Question 4 Select one: a. The parent process outputs 1, but the child process outputs 0, because the value of a is updated only in the parent process. b. Both the parent and the child processes output 1, because the child process inherits the memory state from the parent at the point where fork() is called, and the variable a has been assigned the value 1 at that point. c. The parent process outputs 0, but the child process outputs 1, because the value of a is updated only in the child process.

Which control statement is used to exit the current method and return a value?Question 2Answera.continueb.returnc.exitd.break

Which command wait for the specified process to complete and return the exit status?*1 pointa) sleepb) waitc) delayd) stop

if a thread in a program  invokes exec() immediately after  fork() .  So-------Select one:a. duplicates only calling thread  is appropriateb. duplicates all threads in a separate process