D6828.id19352.diff
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	Index: head/usr.bin/tty/tty.c
	===================================================================
	--- head/usr.bin/tty/tty.c
	+++ head/usr.bin/tty/tty.c
	@@ -63,17 +63,18 @@
	case '?':
	default:
	usage();
	+ /* NOTREACHED */
	}

	- t = ttyname(0);
	+ t = ttyname(STDIN_FILENO);
	if (!sflag)
	puts(t ? t : "not a tty");
	- exit(t ? 0 : 1);
	+ exit(t ? EXIT_SUCCESS : EXIT_FAILURE);
	}

	static void
	usage(void)
	{
	- fprintf(stderr, "usage: tty [-s]\n");
	+ fprintf(stderr, "usage: %s [-s]\n", getprogname());
	exit(2);
	}