sysdeps/unix/sysv/linux/getpt.c

   1 /* Copyright (C) 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <stdlib.h>
  23
  24 /* Path to the master pseudo terminal cloning device.  */
  25 #define _PATH_DEVPTMX "/dev/ptmx"
  26
  27 /* Prototype for function that opens BSD-style master pseudo-terminals.  */
  28 int __bsd_getpt (void);
  29
  30 /* Open a master pseudo terminal and return its file descriptor.  */
  31 int
  32 __getpt (void)
  33 {
  34   static int have_dev_ptmx = 1;
  35   int fd;
  36
  37   if (have_dev_ptmx)
  38     {
  39       fd = __open (_PATH_DEVPTMX, O_RDWR);
  40       if (fd != -1)
  41         return fd;
  42       else
  43         {
  44           if (errno == ENOENT || errno == ENODEV)
  45             have_dev_ptmx = 0;
  46           else
  47             return -1;
  48         }
  49     }
  50
  51   return __bsd_getpt ();
  52 }
  53
  54 #define PTYNAME1 "pqrstuvwxyzabcde";
  55 #define PTYNAME2 "0123456789abcdef";
  56
  57 #define __getpt __bsd_getpt
  58 #include <sysdeps/unix/bsd/getpt.c>