Problem $7.(9$ points$)$:

This problem tests your understanding of Unix process control. Consider the C program below. $($For space

reasons, we are not checking error return codes, so assume that all functions return normally.$)$

Part $1$

int main $()\{$

if fork $()==0$

if fork $()==0$

printf$("9")$;

exit$(1)$;

$\}$

else

printf$("5")$;

$\}$

else $\{$

pid$\_$t pid;

if pid NULL