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The implementation of posix_openpt on Linux can fail in a few extra ways if the appropriate pseudo filesystems are not mounted etc. In some of these cases we have to explicitly set errno.
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* Copyright (C) 1998, 1999, 2001, 2009 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <paths.h>
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#include <sys/statfs.h>
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#include "linux_fsinfo.h"
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/* Path to the master pseudo terminal cloning device. */
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#define _PATH_DEVPTMX _PATH_DEV "ptmx"
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/* Directory containing the UNIX98 pseudo terminals. */
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#define _PATH_DEVPTS _PATH_DEV "pts"
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/* Prototype for function that opens BSD-style master pseudo-terminals. */
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int __bsd_getpt (void);
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/* Open a master pseudo terminal and return its file descriptor. */
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int
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__posix_openpt (oflag)
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int oflag;
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{
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static int have_no_dev_ptmx;
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int fd;
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if (!have_no_dev_ptmx)
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{
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fd = __open (_PATH_DEVPTMX, oflag);
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if (fd != -1)
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{
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struct statfs fsbuf;
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static int devpts_mounted;
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/* Check that the /dev/pts filesystem is mounted
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or if /dev is a devfs filesystem (this implies /dev/pts). */
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if (devpts_mounted
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|| (__statfs (_PATH_DEVPTS, &fsbuf) == 0
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&& fsbuf.f_type == DEVPTS_SUPER_MAGIC)
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|| (__statfs (_PATH_DEV, &fsbuf) == 0
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&& fsbuf.f_type == DEVFS_SUPER_MAGIC))
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{
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/* Everything is ok. */
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devpts_mounted = 1;
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return fd;
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}
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/* If /dev/pts is not mounted then the UNIX98 pseudo terminals
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are not usable. */
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__close (fd);
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have_no_dev_ptmx = 1;
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__set_errno (ENOENT);
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}
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else
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{
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if (errno == ENOENT || errno == ENODEV)
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have_no_dev_ptmx = 1;
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else
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return -1;
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}
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}
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else
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__set_errno (ENOENT);
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return -1;
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}
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weak_alias (__posix_openpt, posix_openpt)
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int
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__getpt (void)
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{
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int fd = __posix_openpt (O_RDWR);
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if (fd == -1)
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fd = __bsd_getpt ();
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return fd;
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}
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#define PTYNAME1 "pqrstuvwxyzabcde";
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#define PTYNAME2 "0123456789abcdef";
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#define __getpt __bsd_getpt
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#define HAVE_POSIX_OPENPT
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#include <sysdeps/unix/bsd/getpt.c>
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