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Annotation of src/usr.bin/tty/tty.c, Revision 1.14

1.14    ! cheloha     1: /*     $OpenBSD: tty.c,v 1.13 2022/12/04 23:50:50 cheloha 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.
1.4       millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #include <stdio.h>
                     34: #include <stdlib.h>
                     35: #include <unistd.h>
1.11      deraadt    36: #include <paths.h>
1.8       deraadt    37: #include <err.h>
1.1       deraadt    38:
1.3       millert    39: static void usage(void);
1.1       deraadt    40:
                     41: int
1.5       deraadt    42: main(int argc, char *argv[])
1.1       deraadt    43: {
                     44:        int ch, sflag;
                     45:        char *t;
                     46:
                     47:        sflag = 0;
                     48:        while ((ch = getopt(argc, argv, "s")) != -1) {
1.7       okan       49:                switch(ch) {
1.1       deraadt    50:                case 's':
                     51:                        sflag = 1;
                     52:                        break;
                     53:                default:
                     54:                        usage();
                     55:                        /* NOTREACHED */
                     56:                }
                     57:        }
1.11      deraadt    58:
                     59:        if (unveil(_PATH_DEVDB, "r") == -1)
1.14    ! cheloha    60:                err(2, "unveil %s", _PATH_DEVDB);
1.11      deraadt    61:        if (pledge("stdio rpath", NULL) == -1)
1.14    ! cheloha    62:                err(2, "pledge");
1.1       deraadt    63:
                     64:        t = ttyname(STDIN_FILENO);
                     65:        if (!sflag)
                     66:                puts(t ? t : "not a tty");
                     67:        exit(t ? 0 : 1);
                     68: }
                     69:
                     70: static void
1.5       deraadt    71: usage(void)
1.1       deraadt    72: {
                     73:        fprintf(stderr, "usage: tty [-s]\n");
                     74:        exit(2);
                     75: }