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107 lines
3.3 KiB
Groff
107 lines
3.3 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)ioctl.2 8.2 (Berkeley) 12/11/93
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.\"
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.TH IOCTL 2 "16 January 1997" GNO "System Calls"
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.SH NAME
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.BR ioctl
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\- control device
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.SH SYNOPSIS
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.br
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#include <sys/ioctl.h>
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.sp 1
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int
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\fBioctl\fR (int \fId\fR, unsigned long \fIrequest\fR, void *\fIargp\fR);
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.SH DESCRIPTION
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The
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.BR ioctl
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function manipulates the underlying device parameters of special files.
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In particular, many operating
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characteristics of character special files (e.g. terminals)
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may be controlled with
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.BR ioctl
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requests.
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The argument
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.I d
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must be an open file descriptor.
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.LP
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An ioctl
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.I request
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has encoded in it whether the argument is an 'in'
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parameter or 'out'
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parameter, and the size of the argument
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.I argp
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in bytes.
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Macros and defines used in specifying an ioctl
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.I request
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are located in the file <sys/ioctl.h>.
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.LP
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The writeups of various devices in chapter 4 discuss how
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.BR ioctl
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applies to them.
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.SH RETURN VALUES
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If an error has occurred, a value of -1 is returned and
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.IR errno
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is set to indicate the error.
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.SH ERRORS
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.BR Ioctl
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will fail if:
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.RS
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.IP \fBEBADF\fR
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.I d
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is not a valid descriptor.
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.IP \fBENOTTY\fR
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.I d
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is not associated with a character
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special device.
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.IP \fBENOTTY\fR
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The specified request does not apply to the kind
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of object that the descriptor
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.I d
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references.
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.IP \fBEINVAL\fR
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.I Request
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or
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.I argp
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is not valid.
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.RE
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.SH SEE ALSO
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.BR mt (1),
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.BR execve (2),
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.BR fcntl (2),
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.BR tty (4),
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.BR intro (4)
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.SH HISTORY
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An
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.BR ioctl
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function call appeared in Version 7 AT&T UNIX.
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