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-.\" Copyright (c) 1980, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)ioctl.2	8.2 (Berkeley) 12/11/93
-.\"
-.\" $FreeBSD$
-.\"
-.Dd September 11, 2013
-.Dt IOCTL 2
-.Os
-.Sh NAME
-.Nm ioctl
-.Nd control device
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/ioctl.h
-.Ft int
-.Fn ioctl "int fd" "unsigned long request" ...
-.Sh DESCRIPTION
-The
-.Fn ioctl
-system call manipulates the underlying device parameters of special files.
-In particular, many operating
-characteristics of character special files (e.g.\& terminals)
-may be controlled with
-.Fn ioctl
-requests.
-The argument
-.Fa fd
-must be an open file descriptor.
-.Pp
-The third argument to
-.Fn ioctl
-is traditionally named
-.Va "char *argp" .
-Most uses of
-.Fn ioctl ,
-however, require the third argument to be a
-.Vt caddr_t
-or an
-.Vt int .
-.Pp
-An
-.Fn ioctl
-.Fa request
-has encoded in it whether the argument is an
-.Dq in
-argument
-or
-.Dq out
-argument, and the size of the argument
-.Fa argp
-in bytes.
-Macros and defines used in specifying an ioctl
-.Fa request
-are located in the file
-.In sys/ioctl.h .
-.Sh GENERIC IOCTLS
-Some generic ioctls are not implemented for all types of file
-descriptors.
-These include:
-.Bl -tag -width "xxxxxx"
-.It Dv FIONREAD int
-Get the number of bytes that are immediately available for reading.
-.It Dv FIONWRITE int
-Get the number of bytes in the descriptor's send queue.
-These bytes are data which has been written to the descriptor but
-which are being held by the kernel for further processing.
-The nature of the required processing depends on the underlying device.
-For TCP sockets, these bytes have not yet been acknowledged by the
-other side of the connection.
-.It Dv FIONSPACE int
-Get the free space in the descriptor's send queue.
-This value is the size of the send queue minus the number of bytes
-being held in the queue.
-Note: while this value represents the number of bytes that may be
-added to the queue, other resource limitations may cause a write
-not larger than the send queue's space to be blocked.
-One such limitation would be a lack of network buffers for a write
-to a network connection.
-.El
-.Sh RETURN VALUES
-If an error has occurred, a value of -1 is returned and
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn ioctl
-system call
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EBADF
-The
-.Fa fd
-argument
-is not a valid descriptor.
-.It Bq Er ENOTTY
-The
-.Fa fd
-argument
-is not associated with a character
-special device.
-.It Bq Er ENOTTY
-The specified request does not apply to the kind
-of object that the descriptor
-.Fa fd
-references.
-.It Bq Er EINVAL
-The
-.Fa request
-or
-.Fa argp
-argument
-is not valid.
-.It Bq Er EFAULT
-The
-.Fa argp
-argument
-points outside the process's allocated address space.
-.El
-.Sh SEE ALSO
-.Xr execve 2 ,
-.Xr fcntl 2 ,
-.Xr intro 4 ,
-.Xr tty 4
-.Sh HISTORY
-The
-.Fn ioctl
-function appeared in
-.At v7 .