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$//$ returns difference in times between a$-$b; positive return means a is

$//$ newer than b; negative indicates b is newer than a

long diff$\_$timespec$($struct timespec a$,$ struct timespec b$)\{$

long diff $=$ a$.$tv$\_$sec $-$ b$.$tv$\_$sec;

if$($diff $!=0)\{$

return diff;

$\}$

diff $=$ a$.$tv$\_$nsec $-$ b$.$tv$\_$nsec;

return diff;

$\}$

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

if $($argc $<3)\{$

fprintf$($stderr$,$ "Usage: $\%$s

$",$ argv$[0])$;

exit$($EXIT$\_$FAILURE$)$;

$\}$

char $*$file$1=$ argv$[1]$;

char $*$file$2=$ argv$[2]$;

$//$ TODO: check that file$1$ and file$2$ both exist. If one of the

$//$ following situatinos arises, print an appropriate message and

$//$ exit with code $1.$

$//$

$//$ Both FILE$1$ and FILE$2$ cannot be accessed

$//$ FILE$1$ cannot be accessed

$//$ FILE$2$ cannot be accessed

$//$

$//$ Replace FILE$1/$FILE$2$ with the names of the files

$//$ YOUR LINES OF CODE HERE

$//$ Now that both files exist, compare time stamps for them

$//$ TODO: Call stat$()$ on each file and extract their $`$st$\_$mtim$`$ field

$//$ which is a $`$struct timespec$`$ indicating the last modification

$//$ time for the file. Pass these two to the provided diff$\_$timespec$()$

$//$ function and use the result to print a message according the

$//$ following situations.

$//$

$//$ FILE$1$ and FILE$2$ are EQUAL in age

$//$ FILE$1$ is OLDER than FILE$2$

$//$ FILE$1$ is NEWER than FILE$2$

$//$ YOUR LINS OF CODE HERE

return $0$;

$\}$