Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!ncar!gatech!mcnc!uvaarpa!mmdf
From: eichin@milo.mit.edu (Mark W. Eichin)
Newsgroups: comp.lang.perl
Subject: recv doesn't widen the read in buffer...
Message-ID: <1991Mar24.035130.16585@uvaarpa.Virginia.EDU>
Date: 24 Mar 91 03:51:30 GMT
Sender: mmdf@uvaarpa.Virginia.EDU (Uvaarpa Mail System)
Reply-To: eichin@milo.mit.edu
Organization: The Internet
Lines: 18

I've been writing some UDP services... and I keep running into
problems with recv. I seem to have missed reporting it. It happens on
at least a few architectures.
	If I have something like:
    local($data)="";
    $addr = recv($service,$data,2000,0); # crashes
I get a core dump out of perl. (3.044 and previous crash just about on
this line; 4.000beta crashes a few lines later.

    local($data)="\0" x 2000;
    $addr = recv($service,$data,2000,0); # works fine...
This seems to work, presumably because data is already allocated with
enough space. 
	Since I'm giving recv a length, shouldn't it know to grow
$data enough to fit?
	Shouldn't perl *never* core dump?
				_Mark_ <eichin@athena.mit.edu>
				MIT Student Information Processing Board