[Zope-dev] more on the segfault saga

[Shane Hathaway]

Leonardo Rochael Almeida wrote:
> On Wed, 2002-03-13 at 13:04, Shane Hathaway wrote:
> 
>>I just found out about something that might help.  If you compiled 
>>against the GNU C library, you can set the environment variable 
>>MALLOC_CHECK_ to 1 to get malloc usage warnings printed to stderr, or 
>>set it to 2 to cause an abort() as soon as an error is detected. 
>>Assuming you're running in production, I'd start with 1 (making sure 
>>stderr is connected to something), then if any warnings occur but they 
>>aren't informative enough, switch to 2.
>>
>>I learned this here:
>>
>>http://www.gnu.org/manual/glibc-2.2.3/html_node/libc_32.html
>>
> 
> Thanks Shane, I'll try that. But first I need a way to not supply -D and
> still get the stderr redirected. This site uses cookie authentication
> (exUserFolder) and even though the traceback ends up in a page that is
> shortly redirected from, some of our client's customers can spot it
> sometimes and they usually call complaining about "the Zope error they
> saw imediatelly before the login page" so we had to disable '-D'.

-D is actually not related AFAIK.  The C library will output to stderr 
regardless of whether -D is supplied, which means you need to use 
standard redirection anyway, for example:

./start >/var/local/log/zope_output 2>&1

Shane