| /* Copyright (C) 1998, 1999, 2000, 2001, 2002 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| |
| /* Prefix for master pseudo terminal nodes. */ |
| #define _PATH_PTY "/dev/pty" |
| |
| |
| /* Letters indicating a series of pseudo terminals. */ |
| #ifndef PTYNAME1 |
| #define PTYNAME1 "pqrsPQRS" |
| #endif |
| const char __libc_ptyname1[] attribute_hidden = PTYNAME1; |
| |
| /* Letters indicating the position within a series. */ |
| #ifndef PTYNAME2 |
| #define PTYNAME2 "0123456789abcdefghijklmnopqrstuv"; |
| #endif |
| const char __libc_ptyname2[] attribute_hidden = PTYNAME2; |
| |
| |
| /* Open a master pseudo terminal and return its file descriptor. */ |
| int |
| __getpt (void) |
| { |
| char buf[sizeof (_PATH_PTY) + 2]; |
| const char *p, *q; |
| char *s; |
| |
| s = __mempcpy (buf, _PATH_PTY, sizeof (_PATH_PTY) - 1); |
| /* s[0] and s[1] will be filled in the loop. */ |
| s[2] = '\0'; |
| |
| for (p = __libc_ptyname1; *p != '\0'; ++p) |
| { |
| s[0] = *p; |
| |
| for (q = __libc_ptyname2; *q != '\0'; ++q) |
| { |
| int fd; |
| |
| s[1] = *q; |
| |
| fd = __open (buf, O_RDWR); |
| if (fd != -1) |
| return fd; |
| |
| if (errno == ENOENT) |
| return -1; |
| } |
| } |
| |
| __set_errno (ENOENT); |
| return -1; |
| } |
| |
| #undef __getpt |
| weak_alias (__getpt, getpt) |
| |
| #ifndef HAVE_POSIX_OPENPT |
| /* We cannot define posix_openpt in general for BSD systems. */ |
| int |
| __posix_openpt (int oflag) |
| { |
| __set_errno (ENOSYS); |
| return -1; |
| } |
| weak_alias (__posix_openpt, posix_openpt) |
| |
| stub_warning (posix_openpt) |
| # include <stub-tag.h> |
| #endif |