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1 | .\" $NetBSD: ioctl.2,v 1.5 1995/02/27 12:33:47 cgd Exp $ | |
2 | .\" | |
3 | .\" Copyright (c) 1980, 1991, 1993 | |
4 | .\" The Regents of the University of California. All rights reserved. | |
5 | .\" | |
6 | .\" Redistribution and use in source and binary forms, with or without | |
7 | .\" modification, are permitted provided that the following conditions | |
8 | .\" are met: | |
9 | .\" 1. Redistributions of source code must retain the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer. | |
11 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
12 | .\" notice, this list of conditions and the following disclaimer in the | |
13 | .\" documentation and/or other materials provided with the distribution. | |
14 | .\" 3. All advertising materials mentioning features or use of this software | |
15 | .\" must display the following acknowledgement: | |
16 | .\" This product includes software developed by the University of | |
17 | .\" California, Berkeley and its contributors. | |
18 | .\" 4. Neither the name of the University nor the names of its contributors | |
19 | .\" may be used to endorse or promote products derived from this software | |
20 | .\" without specific prior written permission. | |
21 | .\" | |
22 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
23 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
24 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
25 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
26 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
27 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
28 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
29 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
30 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
31 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | .\" SUCH DAMAGE. | |
33 | .\" | |
34 | .\" @(#)ioctl.2 8.2 (Berkeley) 12/11/93 | |
35 | .\" | |
36 | .Dd December 11, 1993 | |
37 | .Dt IOCTL 2 | |
38 | .Os BSD 4 | |
39 | .Sh NAME | |
40 | .Nm ioctl | |
41 | .Nd control device | |
42 | .Sh SYNOPSIS | |
43 | .Fd #include <sys/ioctl.h> | |
44 | .Ft int | |
45 | .Fo ioctl | |
46 | .Fa "int fildes" | |
47 | .Fa "unsigned long request" | |
48 | .Fa "..." | |
49 | .Fc | |
50 | .Sh DESCRIPTION | |
51 | The | |
52 | .Fn ioctl | |
53 | function manipulates the underlying device parameters of special files. | |
54 | In particular, many operating | |
55 | characteristics of character special files (e.g. terminals) | |
56 | may be controlled with | |
57 | .Fn ioctl | |
58 | requests. | |
59 | The argument | |
60 | .Fa fildes | |
61 | must be an open file descriptor. | |
62 | .Pp | |
63 | An ioctl | |
64 | .Fa request | |
65 | has encoded in it whether the argument is an | |
66 | .Dq in | |
67 | parameter | |
68 | or | |
69 | .Dq out | |
70 | parameter, and the size of the argument | |
71 | .Fa argp | |
72 | in bytes. | |
73 | Macros and defines used in specifying an ioctl | |
74 | .Fa request | |
75 | are located in the file | |
76 | .Ao Pa sys/ioctl.h Ac . | |
77 | .Sh RETURN VALUES | |
78 | If an error has occurred, a value of -1 is returned and | |
79 | .Va errno | |
80 | is set to indicate the error. | |
81 | .Sh ERRORS | |
82 | .Fn ioctl | |
83 | will fail if: | |
84 | .Bl -tag -width Er | |
85 | .\" ========== | |
86 | .It Bq Er EBADF | |
87 | .Fa fildes | |
88 | is not a valid descriptor. | |
89 | .\" ========== | |
90 | .It Bq Er EINVAL | |
91 | .Fa Request | |
92 | or | |
93 | .Fa argp | |
94 | is not valid. | |
95 | .\" ========== | |
96 | .It Bq Er ENOTTY | |
97 | .Fa fildes | |
98 | is not associated with a character | |
99 | special device. | |
100 | .\" ========== | |
101 | .It Bq Er ENOTTY | |
102 | The specified request does not apply to the kind | |
103 | of object that the descriptor | |
104 | .Fa fildes | |
105 | references. | |
106 | .El | |
107 | .Sh SEE ALSO | |
108 | .Xr cdio 1 , | |
109 | .Xr chio 1 , | |
110 | .Xr mt 1 , | |
111 | .Xr execve 2 , | |
112 | .Xr fcntl 2 , | |
113 | .Xr intro 4 , | |
114 | .Xr tty 4 | |
115 | .Sh HISTORY | |
116 | An | |
117 | .Fn ioctl | |
118 | function call appeared in | |
119 | .At v7 . |