Callable Ping, Networking, callable ICMP ping routine

/*******************************************************************************
**  This source code was posted to Info-MultiNet by Stuart Vance on
**  14-NOV-1996.
**
**  In September 1997, it was modified by Hunter Goatley to work as a
**  callable PING routine that works with the following interfaces:
**
**	SOCKET	- Normal DEC C socket library (BG interface)
**	BG	- $QIO calls to the BG interface (TCPware, MultiNet, UCX)
**	INET	- $QIO calls to the INET interface (TCPware, MultiNet)
**	IP	- $QIO calls to the IP interface (TCPware)
**
**  For all three $QIO versions, a $QIO to the BG interface is used to do
**  the gethostbyname() call.
**
**  To compile using DEC C, use:
**
**	$ cc/standard=vaxc/define=(MAIN,DO_OUTPUT,xxxx) ping
**	$ link ping
**
**  where "xxxx" is "SOCKET", "BG", "INET", or "IP".  To make a callable
**  PING module, simply omit the "MAIN" and "DO_OUTPUT" definitions.
**
**  To call this routine from a program, use:
**
**	int ping (char *hostname, int number_of_packets);
**
*******************************************************************************/
 *  Original Author -
 *	Mike Muuss
 *	U. S. Army Ballistic Research Laboratory
 *	December, 1983
 * Modified at UC Berkeley
 * Modified even more at SRI for MultiNet
 * Modified further for sample RAW socket program at TGV Software, Inc.
 *
 *
 * Status -
 *	Copyright (C) 1988  SRI International
 *	Copyright (C) 1990, 1992, 1995  TGV Software, Inc.
 *
 */