October 2011 - Darwin-dev - lists.apple.com

Re: kqueue, poll and file descriptor types
by Tilghman Lesher 24 Oct '11

24 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meg.abyt.es; s=google; h=mime-version:x-originating-ip:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=DnBX4DhQkFaB/igy7GLxdRCmsc070R/o7Fn0LrwOYX4=; b=L5NxasdUtlfYk0Yw2LpAJuA1A9DbuFjR4KAzguVR1q4I9pvrU+sQFCFJKFNCBQhhj7 lavZmWP0Hhhly0Y/tvuYbXMSpWq0y1PuYO+LwoY9MUS2Q23/qzGWAol96QApB4PM+j8y yAD1EOjUGnq617+mcX/ir9g5e4hUPYNeTTVy8= On Mon, Oct 24, 2011 at 11:35 AM, Joel Reymont <joelr1(a)gmail.com> wrote: > > On Oct 24, 2011, at 5:32 PM, Shantonu Sen wrote: > >> In the abstract, the statement is true (is this a homework question or something?) > > There's a chunk of code in the Erlang virtual machine that clips the maximum number of file descriptors to FD_SETSIZE, 1024 by default, at compile time. > > It only does this on the Mac, claiming the need to fall back to select when kqueue fails. While that's true in the default case, one needs only to define _DARWIN_UNLIMITED_SELECT at compile time (before system headers are #include'd). You still would need to expand the fd_set to a larger bitfield, should you use that construct. We've done this in the Asterisk project, for example. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: kqueue, poll and file descriptor types
by Joel Reymont 24 Oct '11

24 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; bh=obdbcKSvuNAPSH4avzU9JaMhO3yUpd9lf70CGgnPgp4=; b=dt/ZcfO14TFGle9EkevjPS9XBT5w7kW/huZYDQ51GEswiy6w8F+fgHiatviw97Q2pr gDF+9aywMqz9GJfbySBWaXidHhGzmxkyvMH45eow6rywj/yJPg/daeTUTsf9mDVAMQH+ zUnddIvWvslzAqa6uRPqIR56TGt/WX2wZiiBQ= On Oct 24, 2011, at 5:32 PM, Shantonu Sen wrote: > In the abstract, the statement is true (is this a homework question or something?) There's a chunk of code in the Erlang virtual machine that clips the maximum number of file descriptors to FD_SETSIZE, 1024 by default, at compile time. It only does this on the Mac, claiming the need to fall back to select when kqueue fails. -------------------------------------------------------------------------- - for hire: mac osx device driver ninja, kernel extensions and usb drivers ---------------------+------------+--------------------------------------- http://wagerlabs.com | @wagerlabs | http://www.linkedin.com/in/joelreymont ---------------------+------------+--------------------------------------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: kqueue, poll and file descriptor types
by Shantonu Sen 24 Oct '11

24 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com In the abstract, the statement is true (is this a homework question or something?) Filesystems can have varying levels of support, as can character devices (especially kexts external to the kernel that register custom dev nodes). In practice, the main complaint has traditionally been the lack of kqueue support for TTYs, which was resolved in Lion. Shantonu Sen ssen(a)apple.com On Oct 24, 2011, at 9:03 AM, Joel Reymont wrote: > > On Oct 24, 2011, at 5:01 PM, AM wrote: > >> >>> What about the BUGS sections of kqueue: >>> >>> Not all filesystem types support kqueue-style notifications. And even some that do, like some >>> remote filesystems, may only support a subset of the notification semantics described here. >> >> That refers to vnode-watching which select() doesn't support anyway, so that's not it. > > Fair. > >>> >>> and poll: >>> >>> The poll() system call currently does not support devices. >> >> As far as I am aware, select() and poll() are strict subsets feature-wise of kqueue, so I would be very curious to find a counter example. > > > So what about devices in BUGS for poll? > > -------------------------------------------------------------------------- > - for hire: mac osx device driver ninja, kernel extensions and usb drivers > ---------------------+------------+--------------------------------------- > http://wagerlabs.com | @wagerlabs | http://www.linkedin.com/in/joelreymont > ---------------------+------------+--------------------------------------- > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-dev/ssen%40apple.com > > This email sent to ssen(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: kqueue, poll and file descriptor types
by Joel Reymont 24 Oct '11

24 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; bh=LQhwixHDjoLNBfiQX0iFTEsGRUWap/f19KeqH3mI7Cs=; b=cDl02vg0ThmMW2jQUHWnoUxfGka0eKJepp6Yn2vzdIBYQ/6It9ORMy5D6Tri0GBoUO rZshzDDYoeVyJXsklRaCe+TWzkD/YHkzmAXogLfALSxJtKuEAkBGH+fpVU2CM3z7qK0z 9kxHC8WH9uDQIvOmo0gXOlakQ55bsFlWjijHI= On Oct 24, 2011, at 5:01 PM, AM wrote: > >> What about the BUGS sections of kqueue: >> >> Not all filesystem types support kqueue-style notifications. And even some that do, like some >> remote filesystems, may only support a subset of the notification semantics described here. > > That refers to vnode-watching which select() doesn't support anyway, so that's not it. Fair. >> >> and poll: >> >> The poll() system call currently does not support devices. > > As far as I am aware, select() and poll() are strict subsets feature-wise of kqueue, so I would be very curious to find a counter example. So what about devices in BUGS for poll? -------------------------------------------------------------------------- - for hire: mac osx device driver ninja, kernel extensions and usb drivers ---------------------+------------+--------------------------------------- http://wagerlabs.com | @wagerlabs | http://www.linkedin.com/in/joelreymont ---------------------+------------+--------------------------------------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: kqueue, poll and file descriptor types
by Joel Reymont 24 Oct '11

24 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; bh=rtlPT95oLeAnXFz4widUm7x7ELovksF3BnS0hSZ5ia4=; b=s1/kq4XJ4iRJv8Cd1JfrAc9zKmjRQp8/aPhbXkPjfXImM+o5JJgcJiDksABEHPfk9J XA3A6SKy8iWi1TEo5+yIroU9nRL3OpId6vcTHFILvsz61coH7l+W/4206iOSA7kyppkM hppjOH7RMTmbPaHgePeeLISHg8UTviqUD8uu0= On Oct 24, 2011, at 4:43 PM, AM wrote: > Perhaps the above statement was valid once and is needed for legacy compatibility? At the very least the above assertion could be backed up with a counter-example. What about the BUGS sections of kqueue: Not all filesystem types support kqueue-style notifications. And even some that do, like some remote filesystems, may only support a subset of the notification semantics described here. and poll: The poll() system call currently does not support devices. -------------------------------------------------------------------------- - for hire: mac osx device driver ninja, kernel extensions and usb drivers ---------------------+------------+--------------------------------------- http://wagerlabs.com | @wagerlabs | http://www.linkedin.com/in/joelreymont ---------------------+------------+--------------------------------------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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kqueue, poll and file descriptor types
by Joel Reymont 24 Oct '11

24 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=from:content-type:content-transfer-encoding:subject:date:message-id :to:mime-version:x-mailer; bh=ZR3D8SG6/WXBDSw5ggi70qU0qZD7CRJl5FLl0zBRrIo=; b=HZrq8HSS7jakPj/W7DTkpR0q88GGP4L4uuBPSQq0bkXD+0JYXo8tX+ZEhNMFmXIog7 kUM8euxx9HH3wK7CVRPCLlOfryYDAiekmafRLdcQN2SIdHZCd58nVQBCMEq7YuItkJGd cHewC4t71ZB3gPMjO0u+STnkcrXSBjbcyoXPs= I would like an opinion on the following statement. Is it true and if so why? "Neither kqueue() nor poll() can handle all types of file-descriptors on MacOSX. The runtime system needs to be able to handle any type of file-descriptor that may appear. We are therefore forced to fall back on select() when a file-descriptor that cannot be handled by kqueue() appears." Thanks, Joel -------------------------------------------------------------------------- - for hire: mac osx device driver ninja, kernel extensions and usb drivers ---------------------+------------+--------------------------------------- http://wagerlabs.com | @wagerlabs | http://www.linkedin.com/in/joelreymont ---------------------+------------+--------------------------------------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: libauto which version for 10.6.8 + where is the tarball ?
by William Siegrist 15 Oct '11

15 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Sorry about that. 10.6.5 to 10.6.8 all have libauto 141.2 and the website has been updated to reflect that. -Bill On Oct 15, 2011, at 3:15 AM, Nat! wrote: > Hi > > i need a header from libauto. The only place I could find it is here > > http://www.opensource.apple.com/source/libauto/ > > but there is no documentation matching this with an OS X version. A link and a tarball in > http://www.opensource.apple.com/release/mac-os-x-1068/ would be nice :) > > Ciao > Nat! > --------------------------------------------------------- > Der Schlagbaum sollte oben sein. -- Till Lindemann > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-dev/wsiegrist%40apple.com > > This email sent to wsiegrist(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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libauto which version for 10.6.8 + where is the tarball ?
by Nat! 15 Oct '11

15 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi i need a header from libauto. The only place I could find it is here http://www.opensource.apple.com/source/libauto/ but there is no documentation matching this with an OS X version. A link and a tarball in http://www.opensource.apple.com/release/mac-os-x-1068/ would be nice :) Ciao Nat! --------------------------------------------------------- Der Schlagbaum sollte oben sein. -- Till Lindemann _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: task_for_pid fails with os/kern failure even with system.privilege.taskport
by Jean-Daniel Dupas 13 Oct '11

13 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: task_for_pid fails with os/kern failure even with system.privilege.taskport
by Ben Staveley-Taylor 13 Oct '11

13 Oct '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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