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Document two new sysctls: hw.snd.compat_linux_mmap and hw.snd.default_auto.

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Reviewed by:	ariff
Approved by:	re (hrs)
This commit is contained in:
Joel Dahl 2007-06-23 14:34:30 +00:00
parent aca96341db
commit f9bbf742ee
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=171008
1 changed files with 9 additions and 1 deletions
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10
share/man/man4/pcm.4
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@ -25,7 +25,7 @@
.\" .\"
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd May 31, 2007 .Dd June 23, 2007
.Dt SOUND 4 .Dt SOUND 4
.Os .Os
.Sh NAME .Sh NAME
@ -191,6 +191,11 @@ Controls the internal format conversion if it is
available transparently to the application software. available transparently to the application software.
When disabled or not available, the application will When disabled or not available, the application will
only be able to select formats the device natively supports. only be able to select formats the device natively supports.
.It Va hw.snd.compat_linux_mmap
Enable to allow PROT_EXEC page mappings.
All Linux applications using sound and
.Xr mmap 2
require this.
.It Va hw.snd.feeder_rate_round .It Va hw.snd.feeder_rate_round
Sample rate rounding threshold, to avoid large prime division at the Sample rate rounding threshold, to avoid large prime division at the
cost of accuracy. cost of accuracy.
@ -245,6 +250,9 @@ Equivalent to a symlink from
.Pa /dev/dsp .Pa /dev/dsp
to to
.Pa /dev/dsp Ns Va ${hw.snd.default_unit} . .Pa /dev/dsp Ns Va ${hw.snd.default_unit} .
.It Va hw.snd.default_auto
Enable to automatically assign default sound unit to the most recent
attached device.
.It Va dev.pcm.%d.[play|rec].vchans .It Va dev.pcm.%d.[play|rec].vchans
The current number of The current number of
.Tn VCHANs .Tn VCHANs