86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
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/*
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* Copyright (c) 1988 The Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)ttyname.c 5.10 (Berkeley) 5/6/91";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <termios.h>
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#include <unistd.h>
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#include <paths.h>
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#include <_syslist.h>
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static char buf[sizeof (_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
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char *
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ttyname (fd)
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int fd;
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{
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struct stat sb;
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struct termios tty;
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struct dirent *dirp;
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DIR *dp;
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struct stat dsb;
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char *rval;
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/* Must be a terminal. */
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if (tcgetattr (fd, &tty) < 0)
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return NULL;
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/* Must be a character device. */
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if (_fstat (fd, &sb) || !S_ISCHR (sb.st_mode))
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return NULL;
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if ((dp = _opendir (_PATH_DEV)) == NULL)
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return NULL;
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for (rval = NULL; dirp = _readdir (dp);)
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{
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if (dirp->d_ino != sb.st_ino)
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continue;
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strcpy (buf + sizeof (_PATH_DEV) - 1, dirp->d_name);
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if (stat (buf, &dsb) || sb.st_dev != dsb.st_dev ||
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sb.st_ino != dsb.st_ino)
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continue;
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(void) _closedir (dp);
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rval = buf;
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break;
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}
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(void) _closedir (dp);
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return rval;
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}
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