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Document depends_dev.

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Reviewed by:	phk
This commit is contained in:
Dima Dorfman 2001-05-29 04:14:33 +00:00
parent 1d3ebaf302
commit f14b89faeb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77379
1 changed files with 22 additions and 3 deletions
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25
share/man/man9/make_dev.9
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@ -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 .