Processes

Answer the following questions, considering the following C code and a program pin obtained by compiling it with gcc:

int main$($int argc,char$*$ argv$[])$

$\{$

int n $=$ atoi$($argv$[1])$;

printf$("$PIN NUMBER for $\%$d:

$",$n$)$;

int pid $=$ fork$()$;

if $($pid $\%2)\{$

n $+=1$;

int pid$2=$ fork$()$;

if $(!$pid$2)\{$

n $+=2$;

$\}$

else $\{$

n $-=1$;

$\}$

$\}$

else $\{$

n$+=1$;

if $(!$fork$())\{$

n$-=1$;

$\}$

$\}$

n$+=1$;

printf$("\%$d$",$n$)$;

return $0$;

$\}$

$($a$)$ How many input takes the program pin?

$($b$)$ What are the values of variable pid and pid$2?$

$($c$)$ Briey explain what does the function fork$()$ do:

$($d$)$ How many times the printf function is called:

$($e$)$ Draw clearly the process graph, marking the modifications happening to the number n:

$($f$)$ Suppose that the number n is initially $1,$ provide a feasible ouput for the program: