1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 1998 Doug Rabson 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.Dd June 16, 1998 30.Dt DEVICE_GET_STATE 9 31.Os 32.Sh NAME 33.Nm device_get_state , 34.Nm device_busy , 35.Nm device_unbusy , 36.Nm device_is_alive , 37.Nm device_is_attached 38.Nd manipulate device state 39.Sh SYNOPSIS 40.In sys/param.h 41.In sys/bus.h 42.Ft device_state_t 43.Fn device_get_state "device_t dev" 44.Ft void 45.Fn device_busy "device_t dev" 46.Ft void 47.Fn device_unbusy "device_t dev" 48.Ft int 49.Fn device_is_alive "device_t dev" 50.Ft int 51.Fn device_is_attached "device_t dev" 52.Sh DESCRIPTION 53The current state of a device is accessed by calling 54.Fn device_get_state 55which returns 56.Dv DS_NOTPRESENT , 57.Dv DS_ALIVE , 58.Dv DS_ATTACHED 59or 60.Dv DS_BUSY 61(described in 62.Xr device 9 ) . 63To test see if a device was successfully probed, call 64.Fn device_is_alive 65which simply returns if the state is greater or equal to 66.Dv DS_ALIVE . 67To test see if a device was successfully attached, call 68.Fn device_is_attached 69which simply returns if the state is greater or equal to 70.Dv DS_ATTACHED . 71.Pp 72Each device has a busy count which is incremented when 73.Fn device_busy 74is called and decremented when 75.Fn device_unbusy 76is called. 77Both routines return an error if the device state is less than 78.Dv DS_ATTACHED . 79.Pp 80When 81.Fn device_busy 82is called on a device in the 83.Dv DS_ATTACHED 84state, the device changes to the 85.Dv DS_BUSY 86state. 87When 88.Fn device_unbusy 89is called and after decrementing, the busy count for the device is 90zero, the device changes to the 91.Dv DS_ATTACHED 92state. 93.Sh SEE ALSO 94.Xr device 9 95.Sh AUTHORS 96This manual page was written by 97.An Doug Rabson . 98