234 lines
4.5 KiB
Groff
234 lines
4.5 KiB
Groff
.\" $NetBSD: opendisk.3,v 1.16 2018/04/05 11:07:00 wiz Exp $
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.\"
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.\" Copyright (c) 1997, 2001 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Luke Mewburn.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd April 4, 2018
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.Dt OPENDISK 3
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.Os
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.Sh NAME
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.Nm opendisk ,
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.Nm opendisk1
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.Nd open a disk partition
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In util.h
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.Ft int
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.Fo opendisk
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.Fa "const char *path"
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.Fa "int flags"
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.Fa "char *buf"
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.Fa "size_t buflen"
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.Fa "int iscooked"
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.Fc
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.Ft int
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.Fo opendisk1
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.Fa "const char *path"
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.Fa "int flags"
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.Fa "char *buf"
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.Fa "size_t buflen"
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.Fa "int iscooked"
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.Fa "int (*ofn)(const char *, int, ...))"
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.Fc
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.Sh DESCRIPTION
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.Fn opendisk
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opens
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.Fa path ,
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for reading and/or writing as specified by the argument
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.Fa flags
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using
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.Xr open 2 ,
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and the file descriptor is returned to the caller.
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.Fa buf
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is used to store the resultant filename.
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.Fa buflen
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is the size, in bytes, of the array referenced by
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.Fa buf
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(usually
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.Dv MAXPATHLEN
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bytes).
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.Fa iscooked
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controls which paths in
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.Pa /dev
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are tried.
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.Pp
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.Fn opendisk
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attempts to open the following variations of
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.Fa path ,
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in order:
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.Pp
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If
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.Fa path
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does not contain a
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slash
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.Pq Dq / ,
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the following variations are attempted:
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.Pp
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.Bl -dash -compact
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.It
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If
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.Fa iscooked
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is zero:
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.Bl -tag -compact -width "/dev/rpathX"
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.It Pa /dev/rpath
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.Fa path
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with a prefix of
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.Dq Pa /dev/r .
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.It Pa /dev/rpath Ns Em X
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.Fa path
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with a prefix of
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.Dq Pa /dev/r
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and a suffix of
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.Sq Em X
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(q.v.).
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.El
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.It
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If
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.Fa iscooked
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is non-zero:
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.Bl -tag -compact -width "/dev/rpathX"
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.It Pa /dev/path
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.Fa path
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with a prefix of
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.Dq Pa /dev/ .
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.It Pa /dev/path Ns Em X
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.Fa path
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with a prefix of
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.Dq Pa /dev/
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and a suffix of
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.Sq Em X
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(q.v.).
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.El
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.El
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.Pp
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If the above fails, then the original
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.Fa path
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is tried using the following two variations:
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.Pp
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.Bl -dash -compact
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.It
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The
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.Fa iscooked
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value is ignored:
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.Bl -tag -compact -width "/dev/rpathX"
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.It Pa path
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The pathname as given.
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.It Pa path Ns Em X
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.Fa path
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with a suffix of
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.Sq Em X ,
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where
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.Sq Em X
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represents the raw partition of the device, as determined by
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.Xr getrawpartition 3 ,
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usually
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.Dq c
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or
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.Dq d .
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.El
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.El
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.Pp
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.Fn opendisk1
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is identical to
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.Fn opendisk
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except uses the supplied
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.Fa ofn
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function instead of
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.Xr open 2 .
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This function must be compatible
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with
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.Xr open 2
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in the parameters it takes,
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the value it returns,
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and way that errors are indicated.
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.Sh RETURN VALUES
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An open file descriptor, or -1 if the
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.Xr open 2
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failed.
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.Sh ERRORS
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.Fn opendisk
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and
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.Fn opendisk1
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may set
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.Va errno
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to one of the following values:
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.Bl -tag -width Er
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.It Bq Er EFAULT
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.Fa buf
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was the
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.Dv NULL
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pointer.
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.It Bq Er EINVAL
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.Dv O_CREAT
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was set in
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.Fa flags ,
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or
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.Xr getrawpartition 3
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didn't return a valid partition.
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.El
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.Pp
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The
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.Fn opendisk
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function
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may also set
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.Va errno
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to any value specified by the
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.Xr open 2
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function.
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.Pp
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The
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.Fn opendisk1
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function may also set
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.Va errno
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to any value set by the
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.Fa ofn
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function.
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.Sh SEE ALSO
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.Xr open 2 ,
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.Xr getrawpartition 3
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.Sh HISTORY
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The
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.Fn opendisk
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function first appeared in
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.Nx 1.3 .
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.Pp
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The
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.Fn opendisk1
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function first appeared in
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.Nx 6.0 ,
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and was documented in
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.Nx 8.0 .
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.Pp
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The lookup order of
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.Fn opendisk
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was changed in
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.Nx 7.1
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to first look in
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.Pa /dev
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in order to avoid opening random files in the current working directory.
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