/* $Id: forever.c,v 1.1 2012/10/08 16:14:50 ksb Exp $
 * Sleep forever, as cheaply as possible.				(ksb)
 * This is used as a wrapper control process when ":" is not enough.
 * The colon form allows a client to end the diversion with -Q, forever
 * doesn't let that happen.
 * $Compile(*): ${cc:-cc} ${cc_debug:-"-O"} -D%s -o %F %f
 */
#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sysexits.h>

static char rcsid[] =
	"$Id: forever.c,v 1.1 2012/10/08 16:14:50 ksb Exp $";
static char *progname;

/* Drop our priority, just to be nice.  Wait for a signal until one
 * of them kills us (viz. INT, KILL, FPE etc.).
 */
int
main(int argc, char **argv)
{
	register int c;
	extern int opterr;

	if ((char *)0 == argv[0]) {
		progname = "forever";
	} else if ((char *)0 == (progname = strrchr(argv[0], '/'))) {
		progname = argv[0];
	} else {
		++progname;
	}

	opterr = 0;
	while (-1 != (c = getopt(argc, argv, "hV"))) {
		switch (c) {
		case 'V':
			printf("%s: %s\n", progname, rcsid);
			exit(EX_OK);
			/*NOTREACHED*/
		case 'h':
			printf("%s: usgae [label]\n%s: usage -h\n%s: usage -V\n", progname, progname, progname);
			exit(EX_OK);
			/*NOTREACHED*/
		default: /* a label of "--hush" is fine */
			break;
		}
		break;
	}
	(void)setpriority(PRIO_PROCESS, 0, 20);
	close(0);
	close(1);
	close(2);
	do {
		pause();
	} while (1);
	/*NOTREACHED*/
	exit(EX_OK);
}