newlib/libc/unix/ttyname.c

   1 #ifndef _NO_TTYNAME
   2 /*
   3  * Copyright (c) 1988 The Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include "ttyname.h"
  32
  33 #include <dirent.h>
  34 #include <unistd.h>
  35 #include <paths.h>
  36 #include <errno.h>
  37
  38 static char ttyname_buf[TTYNAME_BUFSIZE] = _PATH_DEV;
  39
  40 /*
  41  *  ttyname() - POSIX 1003.1b 4.7.2 - Determine Terminal Device Name
  42  */
  43 char *
  44  ttyname (int fd)
  45 {
  46   register int  fail;
  47   register char *ret=NULL;
  48   fail = ttyname_r( fd, ttyname_buf, sizeof(ttyname_buf) );
  49   if ( fail )  errno = fail;
  50    else  ret = ttyname_buf;
  51   return ret;
  52 }
  53 #endif /* !_NO_TTYNAME  */