Date: Mon, 08 Jan 2007 19:29:02 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: John Baldwin <jhb@freebsd.org> Cc: Ed Schouten <ed@fxq.nl>, freebsd-arch@freebsd.org Subject: Re: Request for PTY/devfs changes Message-ID: <23673.1168284542@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 08 Jan 2007 11:19:38 EST." <200701081119.39163.jhb@freebsd.org>
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In message <200701081119.39163.jhb@freebsd.org>, John Baldwin writes: >On Saturday 06 January 2007 16:36, Ed Schouten wrote: >devfs doesn't seem to handle any of this for you at all, forcing each bit >of code that uses dev_clone to manage all this itself. :( When a device >is opened you can mark it as opened. Perhaps you can have a callout that >periodically checks to see if there are any "orphans" created due to a >stat() and if so schedule a task on a taskqueue to purge them. I need to >figure out something sane for /dev/ipmi0 before I can turn on cloning >there myself. If the device is entirely virtual, like pty, the driver should not allocate any state until open happens and the cdev should be marked with CHEAP_CLONE. In that case the cdev gets recycled quite fast if unreferenced. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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