71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/* $Id$ */
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/* Copyright (c) 2009 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS Unix utils */
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <stdio.h>
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/* tty */
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static int _tty_error(char const * message, int ret);
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static int _tty(void)
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{
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char * tty;
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if(isatty(0) == 1)
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{
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if((tty = ttyname(0)) == NULL)
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return _tty_error("ttyname", 2);
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puts(tty);
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return 0;
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}
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puts("not a tty");
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return 1;
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}
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static int _tty_error(char const * message, int ret)
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{
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fputs("tty: ", stderr);
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perror(message);
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return ret;
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}
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/* usage */
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static int _usage(void)
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{
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fputs("Usage: tty\n", stderr);
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return 1;
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}
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/* main */
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int main(int argc, char * argv[])
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{
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int o;
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while((o = getopt(argc, argv, "")) != -1)
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switch(o)
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{
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default:
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return _usage();
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}
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if(optind != argc)
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return _usage();
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return _tty();
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}
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