Experiment with the program in Listing 24-5 (fork_whos_on_first.c) on other UNIX implementations to determine how these implementations schedule the parent and child processes after a fork().

Suppose that in the program in Listing 24-6, the child process also needed to wait on the parent to complete some actions. What changes to the program would be required in order to enforce this?

If a child process makes the call exit(1), what exit status (as returned by WEXITSTATUS()) will be seen by the parent?