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/* Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "pty-internal.h"
/* Per Documentation/devices.txt: pty masters are /dev/pty[p-za-e][0-9a-f].
These strings are used also in ptsname.c. */
const char __ptyname1[] = "pqrstuvwxyzabcde";
const char __ptyname2[] = "0123456789abcdef";
/* Open the master side of a pseudoterminal and return its file
descriptor, or -1 on error. Linux version. */
int
__getpt ()
{
int fd;
const char *i, *j;
static int have_dev_ptmx = 1;
char namebuf[PTYNAMELEN];
/* The new way: */
if (have_dev_ptmx)
{
fd = __open ("/dev/ptmx", O_RDWR);
if (fd != -1)
return fd;
else
{
if (errno == ENOENT || errno == ENODEV)
have_dev_ptmx = 0;
else
return -1;
}
}
/* The old way: */
strcpy (namebuf, "/dev/pty");
namebuf[10] = '\0';
for (i = __ptyname1; *i; ++i)
{
namebuf[8] = *i;
for (j = __ptyname2; *j; ++j)
{
namebuf[9] = *j;
fd = __open (namebuf, O_RDWR);
if (fd != -1)
return fd;
if (errno != EIO)
return -1;
}
}
__set_errno (ENFILE);
return -1;
}
weak_alias (__getpt, getpt)
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