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authorTobias Klauser <tklauser@distanz.ch>2008-01-27 11:37:44 +0100
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-01-27 11:37:44 +0100
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+<TITLE>ioctl</TITLE>
+<body bgcolor="#ffffcc">
+<hr>
+<pre>
+
+
+
+<h3>IOCTL(2) Linux Programmer's Manual IOCTL(2)
+</h3>
+
+<h3>NAME
+</h3> ioctl - control device
+
+<h3>SYNOPSIS
+</h3> #include &lt;sys/ioctl.h&gt;
+
+ int ioctl(int d, int request, ...)
+
+ [The "third" argument is traditionally char *argp, and
+ will be so named for this discussion.]
+
+<h3>DESCRIPTION
+</h3> The ioctl function manipulates the underlying device
+ parameters of special files. In particular, many operat-
+ ing characteristics of character special files (e.g. ter-
+ minals) may be controlled with ioctl requests. The argu-
+ ment d must be an open file descriptor.
+
+ An ioctl request has encoded in it whether the argument is
+ an in parameter or out parameter, and the size of the
+ argument argp in bytes. Macros and defines used in speci-
+ fying an ioctl request are located in the file
+ sys/ioctl.h.
+
+<h3>RETURN VALUE
+</h3> On success, zero is returned. On error, -1 is returned,
+ and errno is set appropriately.
+
+<h3>ERRORS
+</h3> 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 argp is not valid.
+
+<h3>HISTORY
+</h3> An ioctl function call appeared in Version 7 AT&T UNIX.
+
+</pre>
+<hr>
+<h3>SEE ALSO
+</h3><p>
+<a href=execve.htm>execve</a>,
+<a href=fcntl.htm>fcntl</a>,
+<a href=mt+4>mt</a>,
+<a href=sd+4>sd</a>,
+<a href=tty+4>tty</a>,
+<pre>
+
+
+
+
+
+
+
+
+
+
+
+
+
+<h3>BSD Man Page 23 July 1993 1
+</h3>
+
+ </pre>
+<P>
+<hr>
+<p>
+<center>
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+
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