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/* $OpenBSD: tty.c,v 1.10 2015/10/12 19:56:47 naddy Exp $ */ |
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/* $NetBSD: tty.c,v 1.4 1994/12/07 00:46:57 jtc Exp $ */ |
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/* |
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* Copyright (c) 1988, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <err.h> |
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static void usage(void); |
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int |
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main(int argc, char *argv[]) |
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{ |
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int ch, sflag; |
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char *t; |
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if (pledge("stdio rpath wpath cpath", NULL) == -1) |
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err(1, "pledge"); |
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sflag = 0; |
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while ((ch = getopt(argc, argv, "s")) != -1) { |
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switch(ch) { |
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case 's': |
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sflag = 1; |
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break; |
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case '?': |
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default: |
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usage(); |
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/* NOTREACHED */ |
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} |
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} |
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t = ttyname(STDIN_FILENO); |
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if (!sflag) |
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puts(t ? t : "not a tty"); |
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exit(t ? 0 : 1); |
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} |
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static void |
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usage(void) |
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{ |
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fprintf(stderr, "usage: tty [-s]\n"); |
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exit(2); |
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} |