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| author | kib <kib@FreeBSD.org> | 2010-09-05 14:47:46 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2010-09-05 14:47:46 +0000 |
| commit | f346e513459c484c9f3c5ceeac603f3667dc4d6a (patch) | |
| tree | 0c10e013302ef00dcdb95418fca3599c58f5373e /share/man/man9 | |
| parent | 27478be4a5dbc63a5ecb6c174ab5d18a4fee9622 (diff) | |
| download | FreeBSD-src-f346e513459c484c9f3c5ceeac603f3667dc4d6a.zip FreeBSD-src-f346e513459c484c9f3c5ceeac603f3667dc4d6a.tar.gz | |
Document MAKEDEV_ETERNAL.
MFC after: 3 days
Diffstat (limited to 'share/man/man9')
| -rw-r--r-- | share/man/man9/make_dev.9 | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/share/man/man9/make_dev.9 b/share/man/man9/make_dev.9 index 7faedaa..9cc755f 100644 --- a/share/man/man9/make_dev.9 +++ b/share/man/man9/make_dev.9 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd May 6, 2010 +.Dd September 5, 2010 .Dt MAKE_DEV 9 .Os .Sh NAME @@ -135,6 +135,7 @@ The following values are currently accepted: MAKEDEV_REF reference the created device MAKEDEV_NOWAIT do not sleep, may return NULL MAKEDEV_WAITOK allow the function to sleep to satisfy malloc +MAKEDEV_ETERNAL created device will be never destroyed .Ed .Pp The @@ -154,6 +155,18 @@ the device created is destroyed immediately after drops his reference to cdev. .Pp The +.Dv MAKEDEV_ETERNAL +flag allows the kernel to not acquire some locks when translating system +calls into the cdevsw methods calls. +It is responsibility of the driver author to make sure that +.Fn destroy_dev +is never called on the returned cdev. +For the convenience, use the +.Dv MAKEDEV_ETERNAL_KLD +flag for the code that can be compiled into kernel or loaded +(and unloaded) as loadable module. +.Pp +The .Fn make_dev_cred function is equivalent to the call .Bd -literal -offset indent |
