/usr.bin/tty/tty.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 79 lines · 42 code · 9 blank · 28 comment · 4 complexity · a8aa7935883de00cdbdef72937c8e0d5 MD5 · raw file
- /*
- * 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.
- * 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("$FreeBSD$");
- #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);
- }