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