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At first guess, it would because you have not pre-set the members of fd_set. &nbsp;I believe normal usage, is for instance:<br />
<br />
fd_set rfds;<br />
rfds.fd_count= 6;<br />
FD_CLR( 0, &amp;rfds ); // should avoid the crash
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At first guess, it would because you have not pre-set the members of fd_set.  I believe normal usage, is for instance:

fd_set rfds;
rfds.fd_count= 6;
FD_CLR( 0, &rfds ); // should avoid the crash

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In the following piece of code FD_CLR is crashing ?<br />
<br />
Compiler : VC++ 6<br />
OS &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: Win XP<br />
<br />
The same piece of code is working in Linux.<br />
<br />
Could u pls help me in resolving this. <br />
<br />
==========================<wbr />==========<wbr />=<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; fd_set rfds;<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FD_CLR(0,&amp;rfds); // Crashed, Reason : Unhandled Exception, Illegal Istruction.<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FD_SET(0, &amp;rfds); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;retVal = select(0, NULL, NULL, NULL, &amp;tv);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (-1 == retVal)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;// Action<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
==========================<wbr />==========<wbr />=<br />
Thanks for ur valuable time in helping me in this.<br />
<br />

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In the following piece of code FD_CLR is crashing ?

Compiler : VC++ 6
OS          : Win XP

The same piece of code is working in Linux.

Could u pls help me in resolving this. 

=====================================
                  fd_set rfds;
          	FD_CLR(0,&rfds); // Crashed, Reason : Unhandled Exception, Illegal Istruction.
		FD_SET(0, &rfds);	
		retVal = select(0, NULL, NULL, NULL, &tv);
		if (-1 == retVal)
		{
                             // Action
		}
=====================================
Thanks for ur valuable time in helping me in this.



FD_CLR is crashing

Microsoft Visual C++ (often abbreviated as MSVC or VC++) is an integrated development environment (IDE) product from Microsoft for the C, C++, and C++/CLI programming languages. It features tools for developing and debugging C++ code, especially code written for the Microsoft Windows API, the DirectX API, and the Microsoft .NET Framework. Many applications require redistributable Visual C++ packages to function correctly and are often installed independently of applications, allowing multiple applications to make use of the package while only having to install it once