File descriptors open info

[I Reid]

In article <487 at bria>:

>In an article, theory.tn.cornell.edu!hurf (Hurf Sheldon) writes:
>>is there a Unix system call (or some other method) for
>>finding out how many file descriptors a process has
>>open?

>Well, the *real* way to do this is to go munging through the kernel's
>process table. :-)

Why go to all this trouble when there is a system call to do it (at
least in BSD... don't know about anywhere else). Here's a bit of code
showing it.

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#include <stdio.h>
main () 
{
	int nds,mds,a;
	mds = getdtablemax ();
	nds = getdtablesize ();
	printf ("There are %d descriptors (%d maximum) in use at the moment.\n",mds,nds);
}
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