vnfileops.9 revision 1.5
$NetBSD: vnfileops.9,v 1.5 2002/10/20 20:21:07 gmcgarry Exp $
Copyright (c) 2001 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Gregory McGarry.
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.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the NetBSD
Foundation, Inc. and its contributors.
4. Neither the name of The NetBSD Foundation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``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 FOUNDATION OR CONTRIBUTORS
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.
.Dd October 14, 2002 .Dt VNFILEOPS 9 .Os .Sh NAME .Nm vnfileops , .Nm vn_closefile , .Nm vn_fcntl , .Nm vn_ioctl , .Nm vn_read , .Nm vn_poll , .Nm vn_statfile , .Nm vn_write , .Nd vnode file descriptor operations .Sh SYNOPSIS .Fd #include \*[Lt]sys/param.h\*[Gt] .Fd #include \*[Lt]sys/file.h\*[Gt] .Fd #include \*[Lt]sys/vnode.h\*[Gt] .Ft int .Fn vn_closefile "struct file *fp" "struct proc *p" .Ft int .Fn vn_fcntl "struct file *fp" "u_int com" "caddr_t data" "struct proc *p" .Ft int .Fn vn_ioctl "struct file *fp" "u_long com" "caddr_t data" "struct proc *p" .Ft int .Fn vn_read "struct file *fp" "off_t *offset" "struct uio *uio" "struct ucred *cred" "int flags" .Ft int .Fn vn_poll "struct file *fp" "int events" "struct proc *p" .Ft int .Fn vn_statfile "struct file *fp" "struct stat *sb" "struct proc *p" .Ft int .Fn vn_write "struct file *fp" "off_t *offset" "struct uio *uio" "struct ucred *cred" "int flags" .Sh DESCRIPTION The functions described in this page are the vnode-specific file descriptor operations. They should only be accessed through the opaque function pointers in the file entries (see .Xr file 9 ) . They are described here only for completeness. .Sh FUNCTIONS l -tag -width compact t Fn vn_closefile "fp" "p" Common code for a file table vnode close operation. The file is described by .Fa fp and .Fa p is the calling process. .Fn vn_closefile simply calls .Xr vn_close 9 with the appropriate arguments. t Fn vn_fcntl "fp" "com" "data" "p" Common code for a file table vnode .Xr fcntl 2 operation. The file is specified by .Fa fp . The argument .Fa p is the calling process. .Fn vn_fcntl simply locks the vnode and invokes the vnode operation .Xr VOP_FCNTL 9 with the command .Fa com and buffer .Fa data . The vnode is unlocked on return. If the operation is successful zero is returned, otherwise an appropriate error is returned. t Fn vn_ioctl "fp" "com" "data" "p" Common code for a file table vnode ioctl operation. The file is specified by .Fa fp . The argument .Fa p is the calling process. .Fn vn_ioctl simply locks the vnode and invokes the vnode operation .Xr VOP_IOCTL 9 with the command .Fa com and buffer .Fa data . The vnode is unlocked on return. If the operation is successful zero is returned, otherwise an appropriate error is returned. t Fn vn_read "fp" "offset" "uio" "cred" "flags" Common code for a file table vnode read. The argument .Fa fp is the file structure, The argument .Fa offset is the offset into the file. The argument .Fa uio is the uio structure describing the memory to read into. The caller's credentials are specified in .Fa cred . The .Fa flags argument can define FOF_UPDATE_OFFSET to update the read position in the file. If the operation is successful zero is returned, otherwise an appropriate error is returned. t Fn vn_poll "fp" "events" "p" Common code for a file table vnode poll operation. .Fn vn_poll simply calls .Xr VOP_POLL 9 with the events .Fa events and the calling process .Fa p . If the operation is success zero is returned, otherwise an appropriate error code is returned. t Fn vn_statfile "fp" "sb" "p" Common code for a stat operation. The file descriptor is specified by the argument .Fa fp and .Fa sb is the buffer to return the stat information. The argument .Fa p is the calling process. .Fn vn_statfile basically calls the vnode operation .Xr VOP_GETATTR 9 and transfer the contents of a vattr structure into a struct stat. If the operation is successful zero is returned, otherwise an appropriate error code is returned. t Fn vn_write "fp" "offset" "uio" "cred" "flags" Common code for a file table vnode write. The argument .Fa fp is the file structure, The argument .Fa offset is the offset into the file. The argument .Fa uio is the uio structure describing the memory to read from. The caller's credentials are specified in .Fa cred . The .Fa flags argument can define FOF_UPDATE_OFFSET to update the read position in the file. If the operation is successful zero is returned, otherwise an appropriate error is returned. .El .Sh CODE REFERENCES This section describes places within the .Nx source tree where actual code implementing or utilising the vnode framework can be found. All pathnames are relative to
Copyright (c) 2001 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Gregory McGarry.
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.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the NetBSD
Foundation, Inc. and its contributors.
4. Neither the name of The NetBSD Foundation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``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 FOUNDATION OR CONTRIBUTORS
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.
.Dd October 14, 2002 .Dt VNFILEOPS 9 .Os .Sh NAME .Nm vnfileops , .Nm vn_closefile , .Nm vn_fcntl , .Nm vn_ioctl , .Nm vn_read , .Nm vn_poll , .Nm vn_statfile , .Nm vn_write , .Nd vnode file descriptor operations .Sh SYNOPSIS .Fd #include \*[Lt]sys/param.h\*[Gt] .Fd #include \*[Lt]sys/file.h\*[Gt] .Fd #include \*[Lt]sys/vnode.h\*[Gt] .Ft int .Fn vn_closefile "struct file *fp" "struct proc *p" .Ft int .Fn vn_fcntl "struct file *fp" "u_int com" "caddr_t data" "struct proc *p" .Ft int .Fn vn_ioctl "struct file *fp" "u_long com" "caddr_t data" "struct proc *p" .Ft int .Fn vn_read "struct file *fp" "off_t *offset" "struct uio *uio" "struct ucred *cred" "int flags" .Ft int .Fn vn_poll "struct file *fp" "int events" "struct proc *p" .Ft int .Fn vn_statfile "struct file *fp" "struct stat *sb" "struct proc *p" .Ft int .Fn vn_write "struct file *fp" "off_t *offset" "struct uio *uio" "struct ucred *cred" "int flags" .Sh DESCRIPTION The functions described in this page are the vnode-specific file descriptor operations. They should only be accessed through the opaque function pointers in the file entries (see .Xr file 9 ) . They are described here only for completeness. .Sh FUNCTIONS l -tag -width compact t Fn vn_closefile "fp" "p" Common code for a file table vnode close operation. The file is described by .Fa fp and .Fa p is the calling process. .Fn vn_closefile simply calls .Xr vn_close 9 with the appropriate arguments. t Fn vn_fcntl "fp" "com" "data" "p" Common code for a file table vnode .Xr fcntl 2 operation. The file is specified by .Fa fp . The argument .Fa p is the calling process. .Fn vn_fcntl simply locks the vnode and invokes the vnode operation .Xr VOP_FCNTL 9 with the command .Fa com and buffer .Fa data . The vnode is unlocked on return. If the operation is successful zero is returned, otherwise an appropriate error is returned. t Fn vn_ioctl "fp" "com" "data" "p" Common code for a file table vnode ioctl operation. The file is specified by .Fa fp . The argument .Fa p is the calling process. .Fn vn_ioctl simply locks the vnode and invokes the vnode operation .Xr VOP_IOCTL 9 with the command .Fa com and buffer .Fa data . The vnode is unlocked on return. If the operation is successful zero is returned, otherwise an appropriate error is returned. t Fn vn_read "fp" "offset" "uio" "cred" "flags" Common code for a file table vnode read. The argument .Fa fp is the file structure, The argument .Fa offset is the offset into the file. The argument .Fa uio is the uio structure describing the memory to read into. The caller's credentials are specified in .Fa cred . The .Fa flags argument can define FOF_UPDATE_OFFSET to update the read position in the file. If the operation is successful zero is returned, otherwise an appropriate error is returned. t Fn vn_poll "fp" "events" "p" Common code for a file table vnode poll operation. .Fn vn_poll simply calls .Xr VOP_POLL 9 with the events .Fa events and the calling process .Fa p . If the operation is success zero is returned, otherwise an appropriate error code is returned. t Fn vn_statfile "fp" "sb" "p" Common code for a stat operation. The file descriptor is specified by the argument .Fa fp and .Fa sb is the buffer to return the stat information. The argument .Fa p is the calling process. .Fn vn_statfile basically calls the vnode operation .Xr VOP_GETATTR 9 and transfer the contents of a vattr structure into a struct stat. If the operation is successful zero is returned, otherwise an appropriate error code is returned. t Fn vn_write "fp" "offset" "uio" "cred" "flags" Common code for a file table vnode write. The argument .Fa fp is the file structure, The argument .Fa offset is the offset into the file. The argument .Fa uio is the uio structure describing the memory to read from. The caller's credentials are specified in .Fa cred . The .Fa flags argument can define FOF_UPDATE_OFFSET to update the read position in the file. If the operation is successful zero is returned, otherwise an appropriate error is returned. .El .Sh CODE REFERENCES This section describes places within the .Nx source tree where actual code implementing or utilising the vnode framework can be found. All pathnames are relative to
p The high-level convenience functions are implemented within the file
a sys/kern/vfs_vnops.c . .Sh SEE ALSO .Xr file 9 , .Xr intro 9 , .Xr vnode 9 , .Xr vnodeops 9 , .Xr vnsubr 9