d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add usage().

Browse Source
This commit is contained in:
Philippe Charnier 1997-08-18 07:30:15 +00:00
parent 0e879078f3
commit 759bde1062
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=28372
2 changed files with 22 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
usr.bin/tty/tty.1
View File

@ -33,7 +33,7 @@
.\" SUCH DAMAGE. .\" SUCH DAMAGE.
.\" .\"
.\" @(#)tty.1 8.1 (Berkeley) 6/6/93 .\" @(#)tty.1 8.1 (Berkeley) 6/6/93
.\" $Id$ .\" $Id: tty.1,v 1.4 1997/02/22 19:57:29 peter Exp $
.\" .\"
.Dd June 6, 1993 .Dd June 6, 1993
.Dt TTY 1 .Dt TTY 1
@ -42,11 +42,11 @@
.Nm tty .Nm tty
.Nd return user's terminal name .Nd return user's terminal name
.Sh SYNOPSIS .Sh SYNOPSIS
.Nm tty .Nm
.Op Fl s .Op Fl s
.Sh DESCRIPTION .Sh DESCRIPTION
The The
.Nm tty .Nm
utility writes the name of the terminal attached to standard input utility writes the name of the terminal attached to standard input
to standard output. to standard output.
The name that is written is the string returned by The name that is written is the string returned by
@ -73,8 +73,8 @@ not a terminal, and >1 if an error occurs.
.Xr ttyname 3 .Xr ttyname 3
.Sh STANDARDS .Sh STANDARDS
The The
.Nm tty .Nm
function is expected to be utility is expected to be
.St -p1003.2 .St -p1003.2
compatible. compatible.
.Sh HISTORY .Sh HISTORY

20
usr.bin/tty/tty.c
View File

@ -32,17 +32,25 @@
*/ */
#ifndef lint #ifndef lint
static char copyright[] = static const char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\ "@(#) Copyright (c) 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n"; The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */ #endif /* not lint */
#ifndef lint #ifndef lint
#if 0
static char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93"; static char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$Id$";
#endif /* not lint */ #endif /* not lint */
#include <stdio.h> #include <stdio.h>
#include <unistd.h>
static void usage __P((void));
int
main(argc, argv) main(argc, argv)
int argc; int argc;
char **argv; char **argv;
@ -58,8 +66,7 @@ main(argc, argv)
break; break;
case '?': case '?':
default: default:
fputs("usage: tty [-s]\n", stderr); usage();
exit(2);
} }
t = ttyname(0); t = ttyname(0);
@ -67,3 +74,10 @@ main(argc, argv)
puts(t ? t : "not a tty"); puts(t ? t : "not a tty");
exit(t ? 0 : 1); exit(t ? 0 : 1);
} }
static void
usage()
{
fprintf(stderr, "usage: tty [-s]\n");
exit(2);
}