mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 01:00:07 +00:00
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/* Copyright (C) 1998-2013 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. */
|
|
int __bsd_getpt (void);
|
|
|
|
/* Open a master pseudo terminal and return its file descriptor. */
|
|
int
|
|
__posix_openpt (oflag)
|
|
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>
|