| Current Path : /compat/linux/proc/68247/root/compat/linux/proc/68247/root/compat/linux/proc/68247/root/usr/src/share/man/man9/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //compat/linux/proc/68247/root/compat/linux/proc/68247/root/compat/linux/proc/68247/root/usr/src/share/man/man9/device_get_state.9 |
.\" -*- nroff -*- .\" .\" Copyright (c) 1998 Doug Rabson .\" .\" All rights reserved. .\" .\" This program is free software. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" 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 .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. .\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .\" $FreeBSD: release/9.1.0/share/man/man9/device_get_state.9 121414 2003-10-23 06:24:55Z hmp $ .\" .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 , .Nm device_is_attached .Nd manipulate device state .Sh SYNOPSIS .In sys/param.h .In 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" .Ft int .Fn device_is_attached "device_t dev" .Sh DESCRIPTION The current state of a device is accessed by calling .Fn device_get_state 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 .Fn device_is_alive which simply returns if the state is greater or equal to .Dv DS_ALIVE . To test see if a device was successfully attached, call .Fn device_is_attached which simply returns if the state is greater or equal to .Dv DS_ATTACHED . .Pp Each device has a busy count which is incremented when .Fn device_busy is called and decremented when .Fn device_unbusy is called. Both routines return an error if the device state is less than .Dv DS_ATTACHED . .Pp When .Fn device_busy is called on a device in the .Dv DS_ATTACHED state, the device changes to the .Dv DS_BUSY state. When .Fn device_unbusy 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 manual page was written by .An Doug Rabson .