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From: David Xu <davidxu@freebsd.org>
To: freebsd-stable@freebsd.org
Date: Fri, 31 Mar 2006 08:48:29 +0800
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Subject: Re: Process hanging on 6.0-STABLE
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=D4=DA Friday 31 March 2006 08:38=A3=ACDaniel O'Connor =D0=B4=B5=C0=A3=BA
> On Wednesday 22 March 2006 23:49, Daniel O'Connor wrote:
> > On Wednesday 22 March 2006 18:41, David Xu wrote:
> > > > The problem is that every now and then the process gets stuck and
> > > > becomes unkillable just after forking, ie..
> > >
> > > Are you using pthreads ?
> >
> > Nope.
>=20
> Hmm I just found I had an FD leak - I am not sure if it's related.
>=20
> Interestingly I had ~1046 FDs open and FD_SET wasn't working properly, eg=
=2E..
>     fd_set		fds;
>     int			fd;
>=20
>     fd =3D 1046;
>     FD_ZERO(&fds);
>     FD_SET(fd, &fds);
>=20
> Results in fds being empty :(
>=20
> Does anyone know if that is expected behaviour? And whether this problem=
=20
could=20
> cause the second one (eg tickle a bug).
>=20
> Thanks.
>=20
> --=20
> Daniel O'Connor software and network engineer
> for Genesis Software - http://www.gsoft.com.au
> "The nice thing about standards is that there
> are so many of them to choose from."
>   -- Andrew Tanenbaum
> GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
>=20
In /sys/sys/select.h :
#ifndef FD_SETSIZE
#define FD_SETSIZE      1024U
#endif

so you should define FD_SETSIZE if you have fd which is larger than 1024.

Regards,
David Xu