69cba46141
There was an off-by-one in the old MINIX-specific implementation, which caused ttyname(3) to fail at random. Since we now have a working devname(3), there is no need for MINIX-specific code anymore here. Change-Id: I27d8b6c4f66c84f383156ed494b740d071af02a7
107 lines
3 KiB
C
107 lines
3 KiB
C
/* $NetBSD: ttyname.c,v 1.26 2012/06/12 18:17:04 joerg 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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
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#else
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__RCSID("$NetBSD: ttyname.c,v 1.26 2012/06/12 18:17:04 joerg Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <paths.h>
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#include <string.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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#ifdef __weak_alias
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__weak_alias(ttyname,_ttyname)
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__weak_alias(ttyname_r,_ttyname_r)
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#endif
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int
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ttyname_r(int fd, char *buf, size_t len)
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{
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struct stat sb;
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struct termios ttyb;
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#if !defined(__minix)
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struct ptmget ptm;
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#endif /* !defined(__minix) */
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_DIAGASSERT(fd != -1);
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#if !defined(__minix)
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/* If it is a pty, deal with it quickly */
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if (ioctl(fd, TIOCPTSNAME, &ptm) != -1) {
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if (strlcpy(buf, ptm.sn, len) >= len) {
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return ERANGE;
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}
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return 0;
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}
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#endif /* !defined(__minix) */
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/* Must be a terminal. */
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if (tcgetattr(fd, &ttyb) == -1)
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return errno;
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if (fstat(fd, &sb))
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return errno;
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if (strlcpy(buf, _PATH_DEV, len) >= len)
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return ERANGE;
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buf += strlen(_PATH_DEV);
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len -= strlen(_PATH_DEV);
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return devname_r(sb.st_rdev, sb.st_mode & S_IFMT, buf, len);
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}
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char *
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ttyname(int fd)
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{
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static char buf[PATH_MAX];
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int rv;
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rv = ttyname_r(fd, buf, sizeof(buf));
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if (rv != 0) {
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errno = rv;
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return NULL;
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}
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return buf;
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}
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