189 lines
5.5 KiB
Groff
189 lines
5.5 KiB
Groff
.\" $NetBSD: vnfileops.9,v 1.16 2010/12/02 12:54:13 wiz Exp $
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.\"
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.\" Copyright (c) 2001, 2005, 2006 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 Gregory McGarry.
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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 9, 2008
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.Dt VNFILEOPS 9
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.Os
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.Sh NAME
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.Nm vnfileops ,
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.Nm vn_closefile ,
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.Nm vn_fcntl ,
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.Nm vn_ioctl ,
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.Nm vn_read ,
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.Nm vn_poll ,
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.Nm vn_statfile ,
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.Nm vn_write
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.Nd vnode file descriptor operations
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/file.h
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.In sys/vnode.h
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.Ft int
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.Fn vn_closefile "file_t *fp"
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.Ft int
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.Fn vn_fcntl "file_t *fp" "u_int com" "void *data"
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.Ft int
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.Fn vn_ioctl "file_t *fp" "u_long com" "void *data"
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.Ft int
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.Fn vn_read "file_t *fp" "off_t *offset" "struct uio *uio" "kauth_cred_t cred" "int flags"
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.Ft int
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.Fn vn_poll "file_t *fp" "int events"
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.Ft int
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.Fn vn_statfile "file_t *fp" "struct stat *sb"
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.Ft int
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.Fn vn_write "file_t *fp" "off_t *offset" "struct uio *uio" "kauth_cred_t cred" "int flags"
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.Sh DESCRIPTION
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The functions described in this page are the vnode-specific file
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descriptor operations.
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They should only be accessed through the opaque function pointers
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in the file entries (see
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.Xr file 9 ) .
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They are described here only for completeness.
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.Sh FUNCTIONS
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.Bl -tag -width compact
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.It Fn vn_closefile "fp" "l"
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Common code for a file table vnode close operation.
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The file is described by
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.Fa fp
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and
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.Fa l
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is the calling lwp.
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.Fn vn_closefile
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simply calls
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.Xr vn_close 9
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with the appropriate arguments.
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.It Fn vn_fcntl "fp" "com" "data" "l"
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Common code for a file table vnode
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.Xr fcntl 2
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operation.
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The file is specified by
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.Fa fp .
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The argument
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.Fa l
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is the calling lwp.
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.Fn vn_fcntl
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simply locks the vnode and invokes the vnode operation
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.Xr VOP_FCNTL 9
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with the command
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.Fa com
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and buffer
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.Fa data .
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The vnode is unlocked on return.
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If the operation is successful zero is returned, otherwise an
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appropriate error is returned.
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.It Fn vn_ioctl "fp" "com" "data" "l"
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Common code for a file table vnode ioctl operation.
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The file is specified by
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.Fa fp .
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The argument
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.Fa l
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is the calling lwp
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.Fn vn_ioctl
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simply locks the vnode and invokes the vnode operation
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.Xr VOP_IOCTL 9
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with the command
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.Fa com
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and buffer
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.Fa data .
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The vnode is unlocked on return.
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If the operation is successful zero is returned, otherwise an
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appropriate error is returned.
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.It Fn vn_read "fp" "offset" "uio" "cred" "flags"
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Common code for a file table vnode read.
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The argument
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.Fa fp
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is the file structure, The argument
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.Fa offset
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is the offset into the file.
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The argument
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.Fa uio
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is the uio structure describing the memory to read into.
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The caller's credentials are specified in
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.Fa cred .
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The
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.Fa flags
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argument can define FOF_UPDATE_OFFSET to update the read position in
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the file.
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If the operation is successful zero is returned, otherwise an
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appropriate error is returned.
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.It Fn vn_poll "fp" "events" "l"
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Common code for a file table vnode poll operation.
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.Fn vn_poll
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simply calls
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.Xr VOP_POLL 9
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with the events
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.Fa events
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and the calling lwp
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.Fa l .
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The function returns a bitmask of available events.
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.It Fn vn_statfile "fp" "sb" "l"
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Common code for a stat operation.
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The file descriptor is specified by the argument
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.Fa fp
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and
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.Fa sb
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is the buffer to return the stat information.
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The argument
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.Fa l
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is the calling lwp.
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.Fn vn_statfile
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basically calls the vnode operation
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.Xr VOP_GETATTR 9
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and transfer the contents of a vattr structure into a struct stat.
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If the operation is successful zero is returned, otherwise an
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appropriate error code is returned.
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.It Fn vn_write "fp" "offset" "uio" "cred" "flags"
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Common code for a file table vnode write.
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The argument
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.Fa fp
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is the file structure, The argument
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.Fa offset
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is the offset into the file.
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The argument
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.Fa uio
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is the uio structure describing the memory to read from.
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The caller's credentials are specified in
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.Fa cred .
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The
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.Fa flags
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argument can define FOF_UPDATE_OFFSET to update the read position in
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the file.
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If the operation is successful zero is returned, otherwise an
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appropriate error is returned.
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.El
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.Sh CODE REFERENCES
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The high-level convenience functions are implemented within the file
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.Pa sys/kern/vfs_vnops.c .
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.Sh SEE ALSO
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.Xr file 9 ,
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.Xr intro 9 ,
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.Xr vnode 9 ,
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.Xr vnodeops 9 ,
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.Xr vnsubr 9
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