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>IOCTL(2)                      System Calls Manual                     IOCTL(2)
 
NAME
     ioctl - control device
 
SYNOPSIS
     #include &lt;sys/ioctl.h&#62;
 
     int
     ioctl(int d, unsigned long request, ...);
 
DESCRIPTION
     The ioctl() function manipulates the underlying device parameters of spe-
     cial files.  In particular, many operating characteristics of character
     special files (e.g., terminals) may be controlled with ioctl() requests.
 
     The argument d must be an open file descriptor. The third argument is
     called arg and contains additional information needed by this device to
     perform the requested function.  arg is either an int or a pointer to a
     device-specific data structure, depending upon the given request.
 
     An ioctl request has encoded in it whether the argument is an ``in''
     parameter or ``out'' parameter, and the size of the third argument (arg)
     in bytes.  Macros and defines used in specifying an ioctl request are
     located in the file &lt;sys/ioctl.h&#62;.
 
RETURN VALUES
     If an error has occurred, a value of -1 is returned and errno is set to
     indicate the error.
 
ERRORS
     ioctl() will fail if:
 
     [EBADF]            d is not a valid descriptor.
 
     [ENOTTY]           d is not associated with a character special device.
 
     [ENOTTY]           The specified request does not apply to the kind of
                        object that the descriptor d references.
 
     [EINVAL]           request or arg is not valid.
 
     [EFAULT]           arg points outside the process's allocated address
                        space.
 
SEE ALSO
     cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)
 
HISTORY
     An ioctl() function call appeared in Version 7 AT&amp;T UNIX.
 
BSD                            December 11, 1993                           BSD
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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
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84			`><A`
85			`NAME="NET-COMMON-TCPIP-MANPAGES-IOCTL">ioctl</H1`
86			`><TABLE`
87			`BORDER="5"`
88			`BGCOLOR="#E0E0F0"`
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90			`><TR`
91			`><TD`
92			`><PRE`
93			`CLASS="SCREEN"`
94			`>IOCTL(2) System Calls Manual IOCTL(2)`
95
96			`NAME`
97			`ioctl - control device`
98
99			`SYNOPSIS`
100			`#include <sys/ioctl.h>`
101
102			`int`
103			`ioctl(int d, unsigned long request, ...);`
104
105			`DESCRIPTION`
106			`The ioctl() function manipulates the underlying device parameters of spe-`
107			`cial files. In particular, many operating characteristics of character`
108			`special files (e.g., terminals) may be controlled with ioctl() requests.`
109
110			`The argument d must be an open file descriptor. The third argument is`
111			`called arg and contains additional information needed by this device to`
112			`perform the requested function. arg is either an int or a pointer to a`
113			`device-specific data structure, depending upon the given request.`
114
115			An ioctl request has encoded in it whether the argument is an ``in''
116			parameter or ``out'' parameter, and the size of the third argument (arg)
117			`in bytes. Macros and defines used in specifying an ioctl request are`
118			`located in the file <sys/ioctl.h>.`
119
120			`RETURN VALUES`
121			`If an error has occurred, a value of -1 is returned and errno is set to`
122			`indicate the error.`
123
124			`ERRORS`
125			`ioctl() will fail if:`
126
127			`[EBADF] d is not a valid descriptor.`
128
129			`[ENOTTY] d is not associated with a character special device.`
130
131			`[ENOTTY] The specified request does not apply to the kind of`
132			`object that the descriptor d references.`
133
134			`[EINVAL] request or arg is not valid.`
135
136			`[EFAULT] arg points outside the process's allocated address`
137			`space.`
138
139			`SEE ALSO`
140			`cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)`
141
142			`HISTORY`
143			`An ioctl() function call appeared in Version 7 AT&T UNIX.`
144
145			`BSD December 11, 1993 BSD`
146			`</PRE`
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