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92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/* Copyright (C) 1998-2017 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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/* Prefix for master pseudo terminal nodes. */
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#define _PATH_PTY "/dev/pty"
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/* Letters indicating a series of pseudo terminals. */
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#ifndef PTYNAME1
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#define PTYNAME1 "pqrsPQRS"
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#endif
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const char __libc_ptyname1[] attribute_hidden = PTYNAME1;
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/* Letters indicating the position within a series. */
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#ifndef PTYNAME2
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#define PTYNAME2 "0123456789abcdefghijklmnopqrstuv";
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#endif
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const char __libc_ptyname2[] attribute_hidden = PTYNAME2;
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/* Open a master pseudo terminal and return its file descriptor. */
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int
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__getpt (void)
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{
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char buf[sizeof (_PATH_PTY) + 2];
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const char *p, *q;
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char *s;
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s = __mempcpy (buf, _PATH_PTY, sizeof (_PATH_PTY) - 1);
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/* s[0] and s[1] will be filled in the loop. */
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s[2] = '\0';
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for (p = __libc_ptyname1; *p != '\0'; ++p)
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{
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s[0] = *p;
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for (q = __libc_ptyname2; *q != '\0'; ++q)
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{
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int fd;
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s[1] = *q;
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fd = __open (buf, O_RDWR);
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if (fd != -1)
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return fd;
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if (errno == ENOENT)
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return -1;
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}
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}
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__set_errno (ENOENT);
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return -1;
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}
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#undef __getpt
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weak_alias (__getpt, getpt)
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#ifndef HAVE_POSIX_OPENPT
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/* We cannot define posix_openpt in general for BSD systems. */
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int
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__posix_openpt (int oflag)
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{
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__set_errno (ENOSYS);
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return -1;
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}
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weak_alias (__posix_openpt, posix_openpt)
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stub_warning (posix_openpt)
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#endif
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