63 lines
2.3 KiB
Groff
63 lines
2.3 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1998 Doug Rabson
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $Id$
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.\"
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.Dd June 16, 1998
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.Os
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.Dt DEVICE_PROBE 9
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.Os FreeBSD
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.Sh NAME
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.Nm DEVICE_PROBE
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.Nd probe for device existence
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <sys/bus.h>
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.Ft int
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.Fn DEVICE_PROBE "device_t dev"
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.Sh DESCRIPTION
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.Pp
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This device method should probe to see if the device is present. If
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the device exists, the probe should return 0, otherwise ENXIO should
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be returned. If some other error happens during the probe (such as a
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memory allocation failure), an appropriate error code should be returned.
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.Pp
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Devices which implement busses should use this method to probe for the
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existence of devices attached to the bus and add them as children. If
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this is combined with the use of
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.Xr bus_generic_attach 9
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the child devices will be automatically probed and attached.
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.Sh RETURN VALUES
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Zero is returned on success, otherwise an error is returned.
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.Sh SEE ALSO
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.Xr device 9 ,
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.Xr DEVICE_ATTACH 9
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.Sh AUTHORS
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This man page was written by
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.An Doug Rabson .
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