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| author | dd <dd@FreeBSD.org> | 2001-05-29 04:14:33 +0000 |
|---|---|---|
| committer | dd <dd@FreeBSD.org> | 2001-05-29 04:14:33 +0000 |
| commit | 4f8e07138ff38a5cd22ac7aa2510694bf6d11053 (patch) | |
| tree | 6bb6f3670ed2673caec60583d96d99d2c342da1b /share/man/man9/make_dev.9 | |
| parent | 2dc2275139b5c4c3fa7035658f71e8f17ffe01c7 (diff) | |
| download | FreeBSD-src-4f8e07138ff38a5cd22ac7aa2510694bf6d11053.zip FreeBSD-src-4f8e07138ff38a5cd22ac7aa2510694bf6d11053.tar.gz | |
Document depends_dev.
Reviewed by: phk
Diffstat (limited to 'share/man/man9/make_dev.9')
| -rw-r--r-- | share/man/man9/make_dev.9 | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/share/man/man9/make_dev.9 b/share/man/man9/make_dev.9 index fbc5b0e..565f9a8 100644 --- a/share/man/man9/make_dev.9 +++ b/share/man/man9/make_dev.9 @@ -24,13 +24,15 @@ .\" .\" $FreeBSD$ .\" -.Dd September 25, 1999 +.Dd May 27, 2001 .Os .Dt MAKE_DEV 9 .Sh NAME .Nm make_dev , -.Nm destroy_dev -.Nd "create or destroy dev_t and devfs registration for a new device" +.Nm make_dev_alias , +.Nm destroy_dev , +.Nm depends_dev +.Nd manage dev_t's and DEVFS registration for devices .Sh SYNOPSIS .Fd #include <sys/types.h> .Fd #include <sys/conf.h> @@ -40,6 +42,8 @@ .Fn make_dev_alias "dev_t pdev" "char *fmt" ... .Ft void .Fn destroy_dev "dev_t dev" +.Ft void +.Fn dev_depends "dev_t pdev" "dev_t cdev" .Sh DESCRIPTION The .Fn make_dev @@ -104,6 +108,17 @@ Do not call .Fn destroy_dev on devices that were created with .Fn make_dev_alias . +.Pp +The +.Fn depends_dev +function establishes a parent-child relationship between two devices. +The net effect is that a +.Fn destroy_dev +of the parent device will also result in the destruction of the +child device(s), +if any exist. +A device may simultaneously be a parent and a child, +so it is possible to build a complete hierachy. .Sh HISTORY The .Fn make_dev @@ -115,3 +130,7 @@ The function .Fn make_dev_alias first appeared in .Fx 4.1 . +The function +.Fn depends_dev +first appeared in +.Fx 5.0 . |
