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- /* Copyright (C) 1998, 1999, 2001 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 <stdbool.h>
- #include <unistd.h>
- #include <paths.h>
- #include <sys/statfs.h>
- extern __typeof(statfs) __libc_statfs;
- #if !defined __ASSUME_DEVPTS__
- /* Constant that identifies the `devpts' filesystem. */
- # define DEVPTS_SUPER_MAGIC 0x1cd1
- /* Constant that identifies the `devfs' filesystem. */
- # define DEVFS_SUPER_MAGIC 0x1373
- #endif
- /* 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"
- #if !defined __UNIX98PTY_ONLY__ && defined __UCLIBC_HAS_GETPT__
- /* Prototype for function that opens BSD-style master pseudo-terminals. */
- static __inline__ int __bsd_getpt (void);
- #endif
- /* Open a master pseudo terminal and return its file descriptor. */
- static int
- __posix_openpt (int flags)
- {
- #define have_no_dev_ptmx (1<<0)
- #define devpts_mounted (1<<1)
- #if !defined __UNIX98PTY_ONLY__
- static smallint _state;
- #endif
- int fd;
- #if !defined __UNIX98PTY_ONLY__
- if (!(_state & have_no_dev_ptmx))
- #endif
- {
- fd = open (_PATH_DEVPTMX, flags);
- if (fd != -1)
- {
- #if defined __ASSUME_DEVPTS__
- return fd;
- #else
- struct statfs fsbuf;
- /* Check that the /dev/pts filesystem is mounted
- or if /dev is a devfs filesystem (this implies /dev/pts). */
- if (
- #if !defined __UNIX98PTY_ONLY__
- (_state & devpts_mounted) ||
- #endif
- (__libc_statfs (_PATH_DEVPTS, &fsbuf) == 0
- && fsbuf.f_type == DEVPTS_SUPER_MAGIC)
- || (__libc_statfs (_PATH_DEV, &fsbuf) == 0
- && fsbuf.f_type == DEVFS_SUPER_MAGIC))
- {
- /* Everything is ok. */
- #if !defined __UNIX98PTY_ONLY__
- _state |= devpts_mounted;
- #endif
- return fd;
- }
- /* If /dev/pts is not mounted then the UNIX98 pseudo terminals
- are not usable. */
- close (fd);
- #if !defined __UNIX98PTY_ONLY__
- _state |= have_no_dev_ptmx;
- #endif
- #endif
- }
- else
- {
- #if !defined __UNIX98PTY_ONLY__
- if (errno == ENOENT || errno == ENODEV)
- _state |= have_no_dev_ptmx;
- else
- #endif
- return -1;
- }
- }
- #if !defined __UNIX98PTY_ONLY__ && defined __UCLIBC_HAS_GETPT__
- /* If we have no ptmx then ignore flags and use the fallback. */
- if (_state & have_no_dev_ptmx)
- return __bsd_getpt();
- #endif
- return -1;
- }
- strong_alias(__posix_openpt,posix_openpt)
- #undef have_no_dev_ptmx
- #undef devpts_mounted
- #if defined __USE_GNU && defined __UCLIBC_HAS_GETPT__
- int getpt (void)
- {
- return __posix_openpt(O_RDWR);
- }
- #if !defined __UNIX98PTY_ONLY__ && defined __UCLIBC_HAS_GETPT__
- # define PTYNAME1 "pqrstuvwxyzabcde";
- # define PTYNAME2 "0123456789abcdef";
- # define __getpt __bsd_getpt
- # include "bsd_getpt.c"
- #endif
- #endif /* GNU && __UCLIBC_HAS_GETPT__ */
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