lib/ptsname.c

   1 /* Determine name of the slave side of a pseudo-terminal.
   2    Copyright (C) 1998, 2002, 2010-2019 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include <stdlib.h>
  20
  21 /* Static buffer for 'ptsname'.  */
  22 static char buffer[64];
  23
  24
  25 /* Return the pathname of the pseudo terminal slave associated with
  26    the master FD is open on, or NULL on errors.
  27    The returned storage is good until the next call to this function.  */
  28 char *
  29 ptsname (int fd)
  30 {
  31   return ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer;
  32 }