Following code is a POSIX semaphore usage example. Fill in the blanks.

(assume proper headers were al1 included) int main (int argc, char** argv) sem if (seminit (&sen, 0, 1) == -1) print f ("%s ", strerror(errno): if printf ("*** Critical Section **n" S: ( printf("* Non-Critical Section **n") if (semdestroy (&sem) '= 0) printf("%s ", strerror (errno)); return 0 (&sem) ' 0) printf("%s ", strerror (errno)); ( & sem) .- 0) printf ("%s ", strerror (errno) )