rtime - get remote time
int rtime(addrp, timep, timeout)
struct sockaddr_in *addrp;
struct timeval *timep;
struct timeval *timeout;
rtime() consults the Internet Time Server at the address pointed to by
addrp and returns the remote time in the timeval struct pointed to by
timep. Normally, the UDP protocol is used when consulting the Time
Server. The timeout parameter specifies how long the routine should
wait before giving up when waiting for a reply. If timeout is speci-
fied as NULL, however, the routine will instead use TCP and block until
a reply is received from the time server.
The routine returns 0 if it is successful. Otherwise, it returns -1 and
errno is set to reflect the cause of the error.
22 November 1987 RTIME(3N)