$8.(10$ pts$.)$ Consider the following C program. $($For space reasons, we are not checking error return

codes, so assume that all functions return normally.$)$

pid$\_$t pid;

void handler$1($int sig$)\{$

printf$("$B

$")$;

fflush$($stdout$)$; $//$ flush to stdout

kill$($pid$,$ SIGUSR$2)$;

$\}$

void handler$2($int sig$)\{$

printf$("$C

$")$;

exit$(0)$;

$\}$

main$()\{$

signal$($SIGUSR$1,$ handler$1)$;

signal$($SIGCHLD$,$ handler$2)$;

if $(($pid $=$ fork$())==0)\{$

signal$($SIGUSR$2,$ handler$2)$;

kill$($getppid$(),$ SIGUSR$1)$;

$//$ getppid$()$ returns parent$$s pid

while$(1)\{\}$;

$\}$

else $\{$

pid$\_$t p; int status;

if $(($p $=$ wait$($&status$))>0)\{$

printf$("$A

$")$;

$\}$

$\}$

$\}$

Draw the process model and identify the string$($s$)$ output by each process.

What is the output generated by this program? Are different orders possible?