diff options
Diffstat (limited to 'adv_cmds/tty/tty.c')
-rw-r--r-- | adv_cmds/tty/tty.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/adv_cmds/tty/tty.c b/adv_cmds/tty/tty.c new file mode 100644 index 0000000..806fe4b --- /dev/null +++ b/adv_cmds/tty/tty.c @@ -0,0 +1,83 @@ +/* + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1988, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)tty.c 8.1 (Berkeley) 6/6/93"; +#endif +#endif /* not lint */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: src/usr.bin/tty/tty.c,v 1.9 2002/05/29 17:12:30 jmallett Exp $"); + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +static void usage(void); + +int +main(int argc, char *argv[]) +{ + int ch, sflag; + char *t; + + sflag = 0; + while ((ch = getopt(argc, argv, "s")) != -1) + switch (ch) { + case 's': + sflag = 1; + break; + case '?': + default: + usage(); + } + + t = ttyname(0); + if (!sflag) + puts(t ? t : "not a tty"); + exit(t ? 0 : 1); +} + +static void +usage(void) +{ + fprintf(stderr, "usage: tty [-s]\n"); + exit(2); +} |