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Date:      Wed, 1 Apr 2009 23:57:04 +0300
From:      Kostik Belousov <kostikbel@gmail.com>
To:        Ed Schouten <ed@80386.nl>
Cc:        FreeBSD Hackers <freebsd-hackers@freebsd.org>, Steven Hartland <killing@multiplay.co.uk>
Subject:   Re: How to increase the max pty's on Freebsd 7.0?
Message-ID:  <20090401205703.GX31897@deviant.kiev.zoral.com.ua>
In-Reply-To: <20090401205306.GO13393@hoeg.nl>
References:  <A48E38AADF784030A7496551F1416A3B@multiplay.co.uk> <20090401205306.GO13393@hoeg.nl>

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On Wed, Apr 01, 2009 at 10:53:06PM +0200, Ed Schouten wrote:
> Hi Steven,
>=20
> * Steven Hartland <killing@multiplay.co.uk> wrote:
> > How can I increase the maximum number or ptys available on FreeBSD 7.0?
> >
> > It seems that currently the machine is maxing out at 512 but there is
> > still loads of capacity left on the machine.
> >
> > Ideally would like to double at least the number of ttys available,
> > any help would be most appreciated.
>=20
> You can increase the maximum amount of PTYs by editing a lot of source
> files on your system. There is some good news: in -CURRENT we switched
> to Unix98-style PTYs (/dev/pts/%u). Right now the maximum amount of PTYs
> is limited to 1000 (0 to 999).
>=20
> We're currently limited to 7 characters (pts/999) because our utmp/
> wtmp/lastlog files only reserve 8 bytes for the TTY name. If you're
> brave enough, you can increase UT_LINESIZE in include/utmp.h and
> MAXPTSDEVS in sys/kern/tty_pts.c. Be sure to recompile everything and to
> remove your utmp/wtmp/lastlog files.

Can we switch to %x ? Or even, use some radix encoding of the number,
to allow alphabetical symbols too ?

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