Date: Wed, 13 Dec 2006 12:31:29 -0700 From: Eric Brunson <brunson@brunson.com> Cc: freebsd-questions@freebsd.org Subject: Re: Increasing ptys/ttys beyond 128 Message-ID: <45805511.207@brunson.com> In-Reply-To: <45804CC9.7090807@brunson.com> References: <45803B96.5090402@brunson.com> <20061213183051.GA79921@owl.midgard.homeip.net> <45804CC9.7090807@brunson.com>
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I have a patch for expect, what's the process for getting it reviewed for incorporation into ports? Eric Brunson wrote: > Erik Trulsson wrote: >> On Wed, Dec 13, 2006 at 10:42:46AM -0700, Eric Brunson wrote: >> >>> I've done some searching on the web, but everything I've come across >>> is either out of date and says to recompile the kernel, or else says >>> that after 5.1 the devfs does it automatically. I don't think >>> that's the case. >>> >>> I'm running 6.1 and I need more than the [pt]ty[p-sP-S] devices that >>> will auto-clone in devfs. >>> >>> I've tried adding lines like the following to /etc/default/devfs.rules: >>> >>> add path 'ptyt*' unhide >>> add path 'ttyt*' unhide >>> >>> But that doesn't do the trick. The syntax "unhide" implies to me >>> that the [p-sP-S] nodes exist but but are hidden by the hide_all >>> ruleset. >>> >>> What do I have to do to allow the creation of more ptys? >>> >> >> I don't think you can have more than 256 pty devices in 6.1 >> >> The code in the kernel that handles ptys only allow for >> pty[pqrsPQRS][0-9a-v] >> (and the corresponding tty[pqrsPQRS][0-9a-v] of course.) This gives >> you a >> total of 8*32 = 256 pty devices. (Not 128 as the subjectline implies.) >> > > Actually, that is incredibly helpful. We're having problems with > expect, but when expect searches for a free pty, it only searches > [0-9a-f], which only gives us 128 ptys. There's another problem with > this search resulting in failures after 64 pty allocations which I was > trying to avoid patching in expect, but if I can get 256 processes out > of it, I'll patch away. > > Man, 5 days of searching the web and you set me straight in 48 > minutes... I should have started here first. :-) > > Thanks a *ton*! > >> (I don't think you could have more than 256 ptys back in 4.x either, but >> back then the default setup only gave you 32 ptys, and all the >> instructions I have seen for increasing that number only told how to >> let you use all 256 >> possible devices, but not more than that.) >> >> >> To get more ptys than 256 you will have to start hacking the kernel. >> (There >> does seem to be an alternate naming system for ptys available in >> 7-CURRENT >> but it has not been back-ported to 6.x. See the pty(4) manpage from >> -CURRENT for details on how it works. > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org"
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