We are creating a C program with the following process synchronization behavior. This synchronization process continues forever. Please choose the proper statements for the lines $(1)$ through $(8).$ Each statement should be one of the following statements: $(40$ points$)$

$($a$)$pause$()$

$($b$)$kill $($ppid$,$ SIGUSR$1)$

$($c$)$kill $($cpid$,$ SIGUSR$1)$

$($d$)$kill $($gcpid$,$ SIGUSR$1)$

$($e$)$kill $($pid$,$ SIGUSR$1)$

$($f$)$alarm$(0)$

$($g$)$alarm$(1)$

$($h$)$raise$($SIGUSR$1)$

Parent Process

$(1)$ SIGUSR$1(4)$ SIGUSR$1$

Child

$(2)$ SIGUSR$1$

$(3)$ SIGUSR$1$

Grand Child

$/*$ synchro $--$ example for kill $*/$

#include #include #include #include

int ntimes $=0$; int ntimes$1=0$; int ntimes$2=0$;

int main$()\{$

pid$\_$t ppid, cpid, gcpid, pid;

void p$\_$action$($int$),$ c$\_$action$($int$),$ gc$\_$action$($int$)$; static struct sigaction pact, cact, gcact;

pact.sa$\_$handler $=$ p$\_$action; sigaction$($SIGUSR$1,$ &pact, NULL$)$;

switch$($cpid $=$ fork$())\{$ case $-1$: $/*$ error $*/$

signal! $*/$

perror$("$synchro$")$; exit$(1)$;

case $0$: $/*$ grandchild $*/$ gcact.sa$\_$handler $=$ gc$\_$action;

sigaction$($SIGUSR$1,$ &gcact, NULL$)$; cpid $=$ getppid$()$; $/*$ infinite for loop for exchanging

for$($;;$)\{$

$\}$

perror$("$synchro$")$; exit$(1)$;

case $0$: $/*$ child $*/$

switch$($gcpid $=$ fork$())\{$ case $-1$: $/*$ error $*/$

$\}$

sleep$(1)$; $\_\_\_(1)\_\_\_\_\_\_$; $\_\_\_(2)\_\_\_\_\_\_$;

default : $//$ child cact.sa$\_$handler $=$ c$\_$action;

sigaction$($SIGUSR$1,$ &cact, NULL$)$; ppid $=$ getppid$()$; $/*$ infinite for loop for exchanging signal! $*/$

for$($;;$)\{$

sleep$(1)$;

$\}$

$/*$ parent!! $*/$

$////$ infinite for loop for exchanging signal!

$////$ for$($;;$)\{$

$\}\}$

$\_\_\_(7)\_\_\_\_\_\_$; sleep$(1)$; $\_\_\_(8)\_\_\_\_\_\_$;

$\}$

void p$\_$action$($int sig$)$

$\{$

printf$("$Parent caught signal with ntimes $=$ #$\%$d

$",++$ntimes$)$; $\}$

void c$\_$action$($int sig$)$

$\{$

printf$("$Child caught signal with ntimes$1=$ #$\%$d

$",++$ntimes$1)$; $\}$

void gc$\_$action$($int sig$)$

$\{$

printf$("$Grand Child caught signal with ntimes$2=$ #$\%$d

$",++$ntimes$2)$; $\}$