| /* Copyright (C) 1998-2018 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <paths.h> |
| #include <sys/statfs.h> |
| |
| #include "linux_fsinfo.h" |
| |
| /* Path to the master pseudo terminal cloning device. */ |
| #define _PATH_DEVPTMX _PATH_DEV "ptmx" |
| /* Directory containing the UNIX98 pseudo terminals. */ |
| #define _PATH_DEVPTS _PATH_DEV "pts" |
| |
| /* Prototype for function that opens BSD-style master pseudo-terminals. */ |
| extern int __bsd_getpt (void) attribute_hidden; |
| |
| /* Open a master pseudo terminal and return its file descriptor. */ |
| int |
| __posix_openpt (int oflag) |
| { |
| static int have_no_dev_ptmx; |
| int fd; |
| |
| if (!have_no_dev_ptmx) |
| { |
| fd = __open (_PATH_DEVPTMX, oflag); |
| if (fd != -1) |
| { |
| struct statfs fsbuf; |
| static int devpts_mounted; |
| |
| /* Check that the /dev/pts filesystem is mounted |
| or if /dev is a devfs filesystem (this implies /dev/pts). */ |
| if (devpts_mounted |
| || (__statfs (_PATH_DEVPTS, &fsbuf) == 0 |
| && fsbuf.f_type == DEVPTS_SUPER_MAGIC) |
| || (__statfs (_PATH_DEV, &fsbuf) == 0 |
| && fsbuf.f_type == DEVFS_SUPER_MAGIC)) |
| { |
| /* Everything is ok. */ |
| devpts_mounted = 1; |
| return fd; |
| } |
| |
| /* If /dev/pts is not mounted then the UNIX98 pseudo terminals |
| are not usable. */ |
| __close (fd); |
| have_no_dev_ptmx = 1; |
| __set_errno (ENOENT); |
| } |
| else |
| { |
| if (errno == ENOENT || errno == ENODEV) |
| have_no_dev_ptmx = 1; |
| else |
| return -1; |
| } |
| } |
| else |
| __set_errno (ENOENT); |
| |
| return -1; |
| } |
| weak_alias (__posix_openpt, posix_openpt) |
| |
| |
| int |
| __getpt (void) |
| { |
| int fd = __posix_openpt (O_RDWR); |
| if (fd == -1) |
| fd = __bsd_getpt (); |
| return fd; |
| } |
| |
| |
| #define PTYNAME1 "pqrstuvwxyzabcde"; |
| #define PTYNAME2 "0123456789abcdef"; |
| |
| #define __getpt __bsd_getpt |
| #define HAVE_POSIX_OPENPT |
| #include <sysdeps/unix/bsd/getpt.c> |