1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <unistd.h>
      20  
      21  
      22  /* Store at most BUFLEN characters the pathname of the terminal FD is
      23     open on in BUF.  Return 0 on success,  otherwise an error number.  */
      24  int
      25  __ttyname_r (int fd, char *buf, size_t buflen)
      26  {
      27    __set_errno (ENOSYS);
      28    return ENOSYS;
      29  }
      30  weak_alias (__ttyname_r, ttyname_r)
      31  
      32  stub_warning (ttyname_r)