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/* Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 <limits.h>
#include <stdlib.h>
#include <sys/statfs.h>
#include "linux_fsinfo.h"
/* Prototype for function that changes ownership and access permission
for slave pseudo terminals that do not live on a `devpts'
filesystem. */
static int __unix_grantpt (int fd);
/* Prototype for private function that gets the name of the slave
pseudo terminal in a safe way. */
static int pts_name (int fd, char **pts, size_t buf_len);
/* Change the ownership and access permission of the slave pseudo
terminal associated with the master pseudo terminal specified
by FD. */
int
grantpt (int fd)
{
struct statfs fsbuf;
#ifdef PATH_MAX
char _buf[PATH_MAX];
#else
char _buf[512];
#endif
char *buf = _buf;
if (__builtin_expect (pts_name (fd, &buf, sizeof (_buf)), 0))
{
int save_errno = errno;
/* Check, if the file descriptor is valid. pts_name returns the
wrong errno number, so we cannot use that. */
if (__libc_fcntl (fd, F_GETFD) == -1 && errno == EBADF)
return -1;
__set_errno (save_errno);
/* If the filedescriptor is no TTY, grantpt has to set errno
to EINVAL. */
if (errno == ENOTTY)
__set_errno (EINVAL);
return -1;
}
if (__statfs (buf, &fsbuf) < 0)
return -1;
/* If the slave pseudo terminal lives on a `devpts' filesystem, the
ownership and access permission are already set. */
if (fsbuf.f_type == DEVPTS_SUPER_MAGIC || fsbuf.f_type == DEVFS_SUPER_MAGIC)
return 0;
return __unix_grantpt (fd);
}
#define grantpt static __unix_grantpt
#include <sysdeps/unix/grantpt.c>
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