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Path: utzoo!linus!decvax!genrad!wjh12!harvard!seismo!brl-tgr!gwyn
From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.lang.c
Subject: Why void data is useful :-)
Message-ID: <3153@brl-tgr.ARPA>
Date: Tue, 10-Jul-84 12:47:58 EDT
Article-I.D.: brl-tgr.3153
Posted: Tue Jul 10 12:47:58 1984
Date-Received: Thu, 12-Jul-84 01:22:03 EDT
References: <274@lvbull.UUCP>, <8260@watmath.UUCP>
Organization: Ballistics Research Lab
Lines: 22

Void data is uniquely suited to putting in WOM (Write-Only Memory);
since sizeof(void) is 0, one can pack a lot of data into the WOM.

/* Example of void data -- inspired by UNIX code */

/*ARGSUSED*/
main( argc, argv )
	int	argc;
	char	*argv[];
	{
	char	c;			/* I/O character buffer */
	void	status;			/* system call return status */

	for ( ; ; )
		{
		status = (void)read( 0, &c, 1 );
		if ( (int)c == '\n' )
			break;
		status = (void)write( 1, &c, 1 );
		}
	exit( 0 );			/* nothing can possibly go wrong */
	}