[rtl] Possible new problem with older version of fifo

["Dresner, Norman A." <norman_a_dresner@md.northgrum.com>]

I decided to answer my own question from yesterday about whether the handler
gets invoked when a user-task tries to read from the fifo (but blocks) or
when it succeeds, so I wrote a simple module that creates two fifos with one
common handler.  When the handler is invoked with an event on fifo#2 it gets
data from there and writes it to fifo#1 where a task is blocked reading from
that fifo.

 My original code was:
		n = rtf_get( 2 , buffer , BUFSIZE - 1 );
		if( n <= 0  )
			{
			printk( KERN_ERR "Invoked for fifo2 but no (%d) data
found\n" , n );
			return( -EFAULT );
			}
		m = rtf_put( 1 , buffer , n );
		if( m != n )
			{
			printk( KERN_ERR "Put-Error got %d!= %d (\"%s\")\n"
, m , n , buffer);
			return( -EINVAL );
			}
		else
			{
			printk( KERN_INFO "Put \"%s\" to fifo#1\n" , buffer
);
			}
But the return value from rtf_put() --  (m) --  is consistently zero.  I can
obviously work around it with:
		if( m != n && m != 0 )
but that doesn't seem right.

I'm using RH 5.2 with RTL 0.9J (The Zentropix distribution).  There are
three obvious possibilities:
	1. My copy of rtf_put() is broken,
or	2. There's a subtle bug in my code that I don't see.,
or	3. The documentation is wrong about the return value (although a
peek at the code says otherwise).

So, my question is, which one is it?

	Thanks
		Norm

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