Re: [Libevent-users] select() call overflow from libevent for different OS

[William Ahern <william@xxxxxxxxxxxxxxxxxx>]

On Sun, Jun 02, 2013 at 08:10:41PM -0400, Thor Lancelot Simon wrote:
> On Sun, Jun 02, 2013 at 03:57:28PM -0700, William Ahern wrote:
> > On Sun, Jun 02, 2013 at 02:05:20PM -0600, J. Scott Dorr wrote:
> > > Yeah, FD_SETSIZE is supposed to be informative, not a tuning parameter.
> > > 
> > 
> > Under POSIX, yes. But some implementations allow the user to define this
> > macro, including OS X, OpenBSD, and Solaris. It looks like Linux/glibc
> > stopped allowing this--or at least stopped making it easy--from what I can
> > tell of the header file in Ubuntu.
> > 
> > It's a bad idea, of course. Though OS X allows the user to set FD_SETSIZE,
> > you still need other magic for the kernel to accept the larger value. And I
> 
> What magic, exactly?

You must define _DARWIN_UNLIMITED_SELECT for the kernel not to return
EINVAL.

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