79 lines
2.4 KiB
Groff
79 lines
2.4 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1996 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: VOP_TRUNCATE.9,v 1.1 1997/03/03 18:00:47 dfr Exp $
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.\"
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.Dd July 24, 1996
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.Os
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.Dt VOP_TRUNCATE 9
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.Sh NAME
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.Nm VOP_TRUNCATE
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.Nd truncate a file
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <sys/vnode.h>
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.Ft int
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.Fn VOP_TRUNCATE "struct vnode *vp" "off_t length" "int flags" "struct ucred *cred" "struct proc *p"
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.Sh DESCRIPTION
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.Pp
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The arguments are:
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.Bl -tag -width length
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.It Ar vp
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The file to truncate.
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.It Ar length
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The desired new length of the file.
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.It Ar flags
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Flags controlling I/O.
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.It Ar cred
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Credentials of the caller.
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.It Ar p
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Current process.
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.El
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.Pp
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The size of file
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.Fa vp
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is set to
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.Fa length .
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The file can be both truncated and extended by this call.
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If
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.Fa flags
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contains the value
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.Dv IO_SYNC
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then all writes to the filesystem should complete before the call returns.
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This call is used internally by the UFS filesystem as part of its
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implementation of
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.Xr VOP_SETATTR 9 .
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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 vnode 9 ,
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.Xr VOP_SETATTR 9
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.Sh AUTHORS
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This man page was written by Doug Rabson.
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