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authorEd Schouten <ed@FreeBSD.org>2008-08-20 08:31:58 +0000
committerEd Schouten <ed@FreeBSD.org>2008-08-20 08:31:58 +0000
commitbc093719ca478fe10b938cef32c30b528042cbcd (patch)
treebd0c08a66997254385160ce71ea32029b99f99f9 /sys/bsm
parentb14f19cf9742655c453d9c1dd672393c31080af4 (diff)
downloadsrc-bc093719ca478fe10b938cef32c30b528042cbcd.tar.gz
src-bc093719ca478fe10b938cef32c30b528042cbcd.zip
Integrate the new MPSAFE TTY layer to the FreeBSD operating system.
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
Notes: svn path=/head/; revision=181905
Diffstat (limited to 'sys/bsm')
-rw-r--r--sys/bsm/audit_kevents.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/bsm/audit_kevents.h b/sys/bsm/audit_kevents.h
index 400b79de85f9..c53843136f01 100644
--- a/sys/bsm/audit_kevents.h
+++ b/sys/bsm/audit_kevents.h
@@ -548,6 +548,7 @@
#define AUE_MKNODAT 43150 /* FreeBSD. */
#define AUE_READLINKAT 43151 /* FreeBSD. */
#define AUE_SYMLINKAT 43152 /* FreeBSD. */
+#define AUE_POSIXOPENPT 43153 /* FreeBSD. */
/*
* Darwin BSM uses a number of AUE_O_* definitions, which are aliased to the