Attempts to start tftpd with the command line '/var/libexec/tftpd -l' are 
unsuccessful. /var/log/daemon says:

Apr  8 19:16:37 scruz tftpd[19002]: recvfrom: Socket operation on non-socket

tftp is listed in /etc/services:

tftp            69/udp          # Trivial File Transfer Protocol

Any thoughts?