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<TITLE>IBM Visualization Data Explorer Programmer's Reference</TITLE>
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<META HTTP-EQUIV="updated" CONTENT="Tue, 16 Sep 1997 ">
<META HTTP-EQUIV="review" CONTENT="Fri, 14 Aug 1998 ">
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<H1>IBM Visualization Data Explorer Programmer's Reference</H1>
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<H3><A NAME="HDRDXREGIH"
HREF="progu097.htm#PToC_383">DXRegisterInputHandler</A></H3>
<A NAME="IDX2004"></A>
<A NAME="IDX2005"></A>
<P><STRONG>Function</STRONG>
<P>Assigns a handler routine for input coming from an open file
descriptor.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
#include <dx/dx.h><BR>
<P><BR>
Error DXRegisterInputHandler(Error (*proc)(int, Pointer), int fd, Pointer
arg)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>Assigns a handler routine for input coming from an open file
descriptor. This function
associates the routine <TT><STRONG>proc</STRONG></TT> with the
file descriptor
<TT><STRONG>fd</STRONG></TT> and may be used to accept input from a
socket. When any input is available on <TT><STRONG>fd</STRONG></TT>, the
routine <TT><STRONG>proc</STRONG></TT> is called and
passed <TT><STRONG>fd</STRONG></TT>
and <TT><STRONG>arg</STRONG></TT>.
<P>
The file descriptor is checked for input between module executions.
Input from <TT><STRONG>fd</STRONG></TT> does not interrupt modules;
<TT><STRONG>fd</STRONG></TT> is not checked for input before returning
from DXRegisterInputHandler.
<P>
Calling DXRegisterInputHandler with <TT><STRONG>proc=NULL</STRONG></TT>
unregisters the handler.
<P><STRONG>Return Value</STRONG>
<P>Returns
<TT><STRONG>OK</STRONG></TT>,
or returns
<TT><STRONG>
ERROR
</STRONG></TT>
and sets the
error code to indicate an error.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu286.htm#HDRDXRTR">DXReadyToRun</A>
</STRONG></TT>
<P>
<A HREF="progu065.htm#HDRASYNS">13.11 , "Asynchronous Services"</A>.
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