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Annotation of src/usr.bin/tty/tty.c, Revision 1.3

1.3     ! millert     1: /*     $OpenBSD: tty.c,v 1.2 1996/06/26 05:42:03 deraadt Exp $ */
1.1       deraadt     2: /*     $NetBSD: tty.c,v 1.4 1994/12/07 00:46:57 jtc Exp $      */
                      3:
                      4: /*
                      5:  * Copyright (c) 1988, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: static char copyright[] =
                     39: "@(#) Copyright (c) 1988, 1993\n\
                     40:        The Regents of the University of California.  All rights reserved.\n";
                     41: #endif /* not lint */
                     42:
                     43: #ifndef lint
                     44: #if 0
                     45: static char sccsid[] = "@(#)tty.c      8.1 (Berkeley) 6/6/93";
                     46: #endif
1.3     ! millert    47: static char rcsid[] = "$OpenBSD: tty.c,v 1.2 1996/06/26 05:42:03 deraadt Exp $";
1.1       deraadt    48: #endif /* not lint */
                     49:
                     50: #include <stdio.h>
                     51: #include <stdlib.h>
                     52: #include <unistd.h>
                     53:
1.3     ! millert    54: static void usage(void);
1.1       deraadt    55:
                     56: int
                     57: main(argc, argv)
                     58:        int argc;
                     59:        char **argv;
                     60: {
                     61:        int ch, sflag;
                     62:        char *t;
                     63:
                     64:        sflag = 0;
                     65:        while ((ch = getopt(argc, argv, "s")) != -1) {
                     66:                switch((char)ch) {
                     67:                case 's':
                     68:                        sflag = 1;
                     69:                        break;
                     70:                case '?':
                     71:                default:
                     72:                        usage();
                     73:                        /* NOTREACHED */
                     74:                }
                     75:        }
                     76:
                     77:        t = ttyname(STDIN_FILENO);
                     78:        if (!sflag)
                     79:                puts(t ? t : "not a tty");
                     80:        exit(t ? 0 : 1);
                     81: }
                     82:
                     83:
                     84: static void
                     85: usage ()
                     86: {
                     87:        fprintf(stderr, "usage: tty [-s]\n");
                     88:        exit(2);
                     89: }