[rsyslog] support for arbitrary number of open files

[Rainer Gerhards]

Tomas,

I am currently working on integration of this patch. What puzzles me is the
call to "howmany()". I don't find any doc on it, nor an implementation inside
the patch. Could you elaborate what it does and where it stems from?

Also, I think there is a segfault in gss-misc, because the glbl interface is
never aquired (the will result in a NULL-pointer dereference). I also need to
change the glbl interface definitions, FdSetSize must always be present, else
the interface is no longer well-defined. I will post the completely
integrated patch when I am done. 

But feedback on howmany() would be most appreciated, because I currently do
not know exactly how to handle it.

Thanks,
Rainer

> -----Original Message-----
> From: rsyslog-bounces at lists.adiscon.com [mailto:rsyslog-
> bounces at lists.adiscon.com] On Behalf Of Tomas Heinrich
> Sent: Monday, November 16, 2009 5:25 PM
> To: rsyslog-users
> Subject: [rsyslog] support for arbitrary number of open files
> 
> Hi all,
> 
> currently the total number of files (and tcp connections) that can be
> open simultaneously is limited by the select() system call. Ideally
> this
>   would be changed to *poll(), but that can take some time.
> 
> Until that happens, this patch[1] tries to remove the limitations of
> select() by enlarging the bit mask that is used for storing file
> descriptor information and redefining the macros that process it.
> This modification is inspired by Bind's use of select().
> It is rather a workaround and may not be entirely portable.
> 
> The actual changes to the code aren't big, but they are in many places
> so  sufficient testing is needed. Allocating and freeing fd_sets in
> some
> frequently called functions may decrease performance. This can be dealt
> with but would require more pervasive changes.
> 
> Thoughts?
> 
> Thanks,
> Tomas
> 
> [1] - http://people.redhat.com/pvrabec/rsyslog-4.4.2-unlimited-
> select.patch
> 
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