网络远程唤醒

代码说明：

This program generates and transmits a Wake-On-LAN (WOL) "Magic Packet",    used for restarting machines that have been soft-powered-down    (ACPI D3-warm state).  It currently generates the standard AMD Magic Packet    format, with an optional password appended.    This software may be used and distributed according to the terms    of the GNU Public License, incorporated herein by reference.    Contact the author for use under other terms.    This source file was originally part of the network tricks package, and    is now distributed to support the Scyld Beowulf system.    Copyright 1999-2003 Donald Becker and Scyld Computing Corporation.    The author may be reached as becker@scyld, or C/O     Scyld Computing Corporation