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.\" $FreeBSD$ 30.\" 31.Dd June 16, 1998 32.Dt DEVICE_GET_STATE 9 33.Os FreeBSD 34.Sh NAME 35.Nm device_get_state , 36.Nm device_busy , 37.Nm device_unbusy , 38.Nm device_is_alive 39.Nd manipulate device state 40.Sh SYNOPSIS 41.Fd #include <sys/param.h> 42.Fd #include <sys/bus.h> 43.Ft device_state_t 44.Fn device_get_state "device_t dev" 45.Ft void 46.Fn device_busy "device_t dev" 47.Ft void 48.Fn device_unbusy "device_t dev" 49.Ft int 50.Fn device_is_alive "device_t dev" 51.Sh DESCRIPTION 52.Pp 53The current state of a device is accessed by calling 54.Xr device_get_state 9 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.Xr device_is_alive 9 65which simply returns if the state is greater or equal to 66.Dv DS_ALIVE . 67.Pp 68Each device has a busy count which is incremented when 69.Xr device_busy 9 70is called and decremented when 71.Xr device_unbusy 9 72is called. Both routines return an error if the device state is less 73than 74.Dv DS_ATTACHED . 75.Pp 76When 77.Xr device_busy 9 78is called on a device in the 79.Dv DS_ATTACHED 80state, the device changes to the 81.Dv DS_BUSY 82state. 83When 84.Xr device_unbusy 9 85is called and after decrementing, the busy count for the device is 86zero, the device changes to the 87.Dv DS_ATTACHED 88state. 89.Sh SEE ALSO 90.Xr device 9 91.Sh AUTHORS 92This man page was written by 93.An Doug Rabson . 94