freebsd-dev/share/man/man9/device_get_state.9
Jens Schweikhardt c1f3e4bf21 Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by:	Silence from cvs diff -b
MFC after:	7 days
2001-07-14 19:41:16 +00:00

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.\" -*- nroff -*-
.\"
.\" Copyright (c) 1998 Doug Rabson
.\"
.\" All rights reserved.
.\"
.\" This program is free software.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\" $FreeBSD$
.\"
.Dd June 16, 1998
.Dt DEVICE_GET_STATE 9
.Os
.Sh NAME
.Nm device_get_state ,
.Nm device_busy ,
.Nm device_unbusy ,
.Nm device_is_alive
.Nd manipulate device state
.Sh SYNOPSIS
.Fd #include <sys/param.h>
.Fd #include <sys/bus.h>
.Ft device_state_t
.Fn device_get_state "device_t dev"
.Ft void
.Fn device_busy "device_t dev"
.Ft void
.Fn device_unbusy "device_t dev"
.Ft int
.Fn device_is_alive "device_t dev"
.Sh DESCRIPTION
The current state of a device is accessed by calling
.Xr device_get_state 9
which returns
.Dv DS_NOTPRESENT ,
.Dv DS_ALIVE ,
.Dv DS_ATTACHED
or
.Dv DS_BUSY
(described in
.Xr device 9 ) .
To test see if a device was successfully probed, call
.Xr device_is_alive 9
which simply returns if the state is greater or equal to
.Dv DS_ALIVE .
.Pp
Each device has a busy count which is incremented when
.Xr device_busy 9
is called and decremented when
.Xr device_unbusy 9
is called. Both routines return an error if the device state is less
than
.Dv DS_ATTACHED .
.Pp
When
.Xr device_busy 9
is called on a device in the
.Dv DS_ATTACHED
state, the device changes to the
.Dv DS_BUSY
state.
When
.Xr device_unbusy 9
is called and after decrementing, the busy count for the device is
zero, the device changes to the
.Dv DS_ATTACHED
state.
.Sh SEE ALSO
.Xr device 9
.Sh AUTHORS
This man page was written by
.An Doug Rabson .