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* Integrate the new MPSAFE TTY layer to the FreeBSD operating system.Ed Schouten2008-08-201-205/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The last half year I've been working on a replacement TTY layer for the FreeBSD kernel. The new TTY layer was designed to improve the following: - Improved driver model: The old TTY layer has a driver model that is not abstract enough to make it friendly to use. A good example is the output path, where the device drivers directly access the output buffers. This means that an in-kernel PPP implementation must always convert network buffers into TTY buffers. If a PPP implementation would be built on top of the new TTY layer (still needs a hooks layer, though), it would allow the PPP implementation to directly hand the data to the TTY driver. - Improved hotplugging: With the old TTY layer, it isn't entirely safe to destroy TTY's from the system. This implementation has a two-step destructing design, where the driver first abandons the TTY. After all threads have left the TTY, the TTY layer calls a routine in the driver, which can be used to free resources (unit numbers, etc). The pts(4) driver also implements this feature, which means posix_openpt() will now return PTY's that are created on the fly. - Improved performance: One of the major improvements is the per-TTY mutex, which is expected to improve scalability when compared to the old Giant locking. Another change is the unbuffered copying to userspace, which is both used on TTY device nodes and PTY masters. Upgrading should be quite straightforward. Unlike previous versions, existing kernel configuration files do not need to be changed, except when they reference device drivers that are listed in UPDATING. Obtained from: //depot/projects/mpsafetty/... Approved by: philip (ex-mentor) Discussed: on the lists, at BSDCan, at the DevSummit Sponsored by: Snow B.V., the Netherlands dcons(4) fixed by: kan Notes: svn path=/head/; revision=181905
* Preparation commit for the tty cleanups that will follow in the nearPoul-Henning Kamp2004-07-151-1/+1
| | | | | | | | | | | | future: rename ttyopen() -> tty_open() and ttyclose() -> tty_close(). We need the ttyopen() and ttyclose() for the new generic cdevsw functions for tty devices in order to have consistent naming. Notes: svn path=/head/; revision=132226
* Do the dreaded s/dev_t/struct cdev */Poul-Henning Kamp2004-06-161-1/+1
| | | | | | | Bump __FreeBSD_version accordingly. Notes: svn path=/head/; revision=130585
* Fix registration of loadable line disciplines.Poul-Henning Kamp2004-06-121-1/+2
| | | | | | | This should make watch(8)/snp(4) work again. Notes: svn path=/head/; revision=130377
* Make linesw[] an array of pointers to linedesc instead of an array ofPoul-Henning Kamp2004-06-071-61/+57
| | | | | | | linedisc. Notes: svn path=/head/; revision=130203
* Remove advertising clause from University of California Regent's license,Warner Losh2004-04-051-4/+0
| | | | | | | | | per letter dated July 22, 1999. Approved by: core Notes: svn path=/head/; revision=127911
* Use __FBSDID().David E. O'Brien2003-06-111-1/+3
| | | | Notes: svn path=/head/; revision=116182
* KSE Milestone 2Julian Elischer2001-09-121-2/+2
| | | | | | | | | | | | | | | | | Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha Notes: svn path=/head/; revision=83366
* Unstaticize l_nullioctl; it is needed elsewhere (like in tty_snoop.c).Dima Dorfman2001-06-041-2/+1
| | | | | | | Suggested by: bde Notes: svn path=/head/; revision=77735
* Don't refer to TABLDISC in the comments here.Peter Wemm2000-01-301-1/+1
| | | | | | | | Submitted by: bde Approved by: jkh Notes: svn path=/head/; revision=56906
* Now that Netgraph is in the system there are some cleanups we can do.Julian Elischer1999-10-231-5/+6
| | | | | | | | | Also save a slightly closer to completion version of the PPPOE code. Submitted by: Archie Cobbs <archie@freebsd.org> Notes: svn path=/head/; revision=52441
* $Id$ -> $FreeBSD$Peter Wemm1999-08-281-1/+1
| | | | Notes: svn path=/head/; revision=50477
* This commit fixes various 64bit portability problems required forDoug Rabson1998-06-071-2/+2
| | | | | | | | | | | | | FreeBSD/alpha. The most significant item is to change the command argument to ioctl functions from int to u_long. This change brings us inline with various other BSD versions. Driver writers may like to use (__FreeBSD_version == 300003) to detect this change. The prototype FreeBSD/alpha machdep will follow in a couple of days time. Notes: svn path=/head/; revision=36735
* Make COMPAT_43 and COMPAT_SUNOS new-style options.Eivind Eklund1997-12-161-1/+3
| | | | Notes: svn path=/head/; revision=31778
* Use ENOIOCTL instead of -1 (= ERESTART) for tty ioctls that areBruce Evans1997-12-061-2/+2
| | | | | | | | not handled at a particular level. This fixes mainly restarting of interrupted TIOCDRAINs and TIOCSETA{W,F}s. Notes: svn path=/head/; revision=31577
* Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are notPeter Wemm1997-02-221-1/+1
| | | | | | | ready for it yet. Notes: svn path=/head/; revision=22975
* Make the long-awaited change from $Id$ to $FreeBSD$Jordan K. Hubbard1997-01-141-1/+1
| | | | | | | | | | | This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise. Notes: svn path=/head/; revision=21673
* Replaced bogus macros for entry points to unconfigured line disciplinesBruce Evans1995-11-051-48/+85
| | | | | | | | | | | | | | | | | by functions. tty_conf.c: Cleaned up formatting of tables. Removed another ARGSUSED for consistency. conf.h: Introduced typedefs for line discipline functions. Backed out most of previous revision (it is done elsewhere). Notes: svn path=/head/; revision=12109
* Obtained from: partly from ancient patches by ache and me via 1.1.5Bruce Evans1995-07-291-5/+5
| | | | | | | | | | | | | | | | | | | Remove nullmodem(). It may be useful to have a null modem routine, but nullmodem() wasn't one. nullmodem() was identical to ttymodem() except it didn't implement MDMBUF (carrier) flow control, didn't do any wakeups for off to on carrier transitions, and didn't flush the i/o queues for on to off carrier transitions (flushing has the side effect of waking up readers and writers) although it did generate SIGHUPs. The wakeups must normally be done even if nullmodem() is null in case something is sleeping waiting for a carrier transition. In any case, the wakeups should be harmless. They may cause bogus results for select(), but select() is already bogus for nonstandard line disciplines. Notes: svn path=/head/; revision=9763
* Remove trailing whitespace.Rodney W. Grimes1995-05-301-2/+2
| | | | Notes: svn path=/head/; revision=8876
* Set it so you can add and remove line disciplines without replicatingPeter Dufault1995-03-211-1/+62
| | | | | | | | code for looking for open slots in table (and you could hide the table if you wanted to). Notes: svn path=/head/; revision=7218
* Allow for loadable line disciplines (eventually).Garrett Wollman1994-10-051-35/+12
| | | | Notes: svn path=/head/; revision=3378
* Added $Id$David Greenman1994-08-021-0/+1
| | | | Notes: svn path=/head/; revision=1817
* The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch.Rodney W. Grimes1994-05-251-1/+7
| | | | | | | | Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman Notes: svn path=/head/; revision=1549
* BSD 4.4 Lite Kernel SourcesRodney W. Grimes1994-05-241-0/+126
Notes: svn path=/head/; revision=1541
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