D6828.id17543.diff
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	Index: usr.bin/tty/tty.c
	===================================================================
	--- usr.bin/tty/tty.c
	+++ usr.bin/tty/tty.c
	@@ -44,6 +44,7 @@

	#include <stdio.h>
	#include <stdlib.h>
	+#include <sysexits.h>
	#include <unistd.h>

	static void usage(void);
	@@ -63,17 +64,18 @@
	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");
	- exit(2);
	+ fprintf(stderr, "usage: %s [-s]\n", getprogname());
	+ exit(EX_USAGE);
	}