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author | dfr <dfr@FreeBSD.org> | 1998-09-03 21:52:05 +0000 |
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committer | dfr <dfr@FreeBSD.org> | 1998-09-03 21:52:05 +0000 |
commit | cd489c519a109c93001769e1008a8a567608e6b8 (patch) | |
tree | 7dd9657b041b5806f628d67e082665accc0027d8 /share/man/man9/device_get_state.9 | |
parent | 243726c1b8c1d3ac7eda2073abcc9375d40b20c1 (diff) | |
download | FreeBSD-src-cd489c519a109c93001769e1008a8a567608e6b8.zip FreeBSD-src-cd489c519a109c93001769e1008a8a567608e6b8.tar.gz |
Add manpages for the new device framework.
Diffstat (limited to 'share/man/man9/device_get_state.9')
-rw-r--r-- | share/man/man9/device_get_state.9 | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/share/man/man9/device_get_state.9 b/share/man/man9/device_get_state.9 new file mode 100644 index 0000000..f67f608 --- /dev/null +++ b/share/man/man9/device_get_state.9 @@ -0,0 +1,93 @@ +.\" -*- 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. +.\" +.\" $Id$ +.\" +.Dd June 16, 1998 +.Dt device_get_state 9 +.Os FreeBSD +.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 +.Pp +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 . |