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postform.c in a loop seg faults

From: Anibal Jodorcovsky <anibal@intelerad.com>
Date: Fri, 31 May 2002 14:26:10 -0400
To: <www-lib@w3.org>
Message-ID: <GAEAJDGPAKALONOKGKNCMEEBCFAA.anibal@intelerad.com>
Hi all,

I've been using libwww for not so long, but I took the code from the sample
postform.c to use in my own app. It seemed to work nice through our tests so
we deployed the app today. whoops! After a little while every app that was
using libwww was seg faulting with SIGSEGV. Ouch!

Going back to my library, where I use libwww I ended up narrowing down the
problem so much that I can reproduce the problem with the sample code

I have a new file now, called postformNew.c (attached).

It has notes at the top on how I compile it and link it. At the end you'll
see the output from a gdb and the crash in HTHost.c (line 209).

The difference between postform.c and postformNew.c is that the new one
calls postform.c in a loop with 42 entries, i.e., calling postform 42 times.
Somewhere in the middle the program crashes.

I think it's either a problem within libwww (but I really doubt it), or I'm
using it wrong within a loop. The problem is that I couldn't find a nice
sample that uses this library in a loop.

Can anybody out there give me a hand here? I tried to make as easy as
possible for anyone to just reproduce this. The code compiles with just
libwww installed. All you might want to modify is the URL and post fields
you use depending on what cgi/servlet you're hitting.

Thanks in advance,

-Anibal Jodorcovsky

Received on Friday, 31 May 2002 14:27:25 UTC

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