Question$2$

This problem tests your understanding of exceptional control flow in $C$ programs. Assume we are running

code on a Unix machine. The following problems all concern the value of the variable counter.

Partl$(12$ points$)$

int counter $=0$;

int main$()$

$\{$

int $i$;

for

fork$()$;

counter $++$;

printf$("$counter $=\%\frac{d}{?}$

$,$ counter$)$;

$\}$

printf$("$counter $=\%\frac{d}{?}$

$,$ counter$)$;

return $0$ ;

$\}$

A$.$ How many times would the value of counter be printed:

B$.$ What is the value of counter printed in the first line?

C$.$ What is the value of counter printed in the last line?Part II $(8$ points$)$

int counter $=0$;

void handler$($int sig$)$

$\{$

counter $++$;

$\}$

int main$()$

$\{$

int $i$;

signal$($SIGCHLD$,$ handler$)$;

for

if fork $()==0$

exit$(0)$;

$\}$

$\}$

$I^{**}$ wait for all children to die $*/$

while $($wait$($NULL$)!=-1)$;

printf$("$counter $=\%$d $\frac{?}{?}$

$,$ counter$)$;

return $0$ ;

$\}$

A$.$ Does the program output the same value of counter every time we run it$?$ Yes No

B$.$ If the answer to $A$ is Yes, indicate the value of the counter variable. Otherwise, list all possible values

of the counter variable.

Answer: counter $=$