Draw the corresponding process tree for the code below. Use circles to model processes. Also

picture pipes $($using a cylinder$)$ and show fork, exec, wait, and pipe function calls. $($Use the next

page for this$).$

What is the written on STDOUT and STDERR? Assume the starting process id is $100.$

const int NUM$\_$KIDS $=3$;

const int MSG$\_$SIZE $=16$;

int main $()($

int fd$[$NUM KIDS$][2]$;

pid$\_$t pid$[$MM$\_$KIDS$]$;

cerr $$ "Start pid: $"$ getpid$()$ endl;

for $($int $i=0$;$i$ NUM KIDS; $i++)($

pipe $($fd$[$i$])$;

pid$[$i$]=$ fork$()$; $//$ Assume no error

if $($pid$[$i$]==0)\{$

cerr $<mtext\; id="EditorElement\_914716"></mtext><mi\; id="EditorElement\_914717">"</mi>$i $="$ i pid: $"$ getpid$()$ endl;

close $($fd$[$i$][0])$;

dup$2($fd$[$i$][1],1)$;

cout $$ getpid i $$ endl;

exit $(0)$;

$\})$ else $\{$

close $($fd$[$i$][1])$;

$\}$

$\}$

for $($int $i=0$; $i$ NUM$\_$KIDS; $i++)\{$

char msg$[$MSG$\_$SIZE$]$;

read$($fd$[$i$][0],$ msg$,$ MSG$\_$SIZE$)$;

cout $<mtext\; id="EditorElement\_914375"></mtext><mi\; id="EditorElement\_914376">"</mi>$msg: $"$ msg $$ endl;

waitpid$($pid$[$i$],$ NULL, $0)$; $//$ Block and wait

close $($fd$[$i$][0])$;

$\}$

$\}$