author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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permissions | -rw-r--r-- |
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/*- |
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* Copyright (c) 1982, 1986, 1989, 1993 |
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* The Regents of the University of California. All rights reserved. |
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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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* 4. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* © Portions Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. |
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* @(#)file.h 8.3 (Berkeley) 1/9/95 |
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* $FreeBSD: src/sys/sys/file.h,v 1.70 2005/02/10 12:27:58 phk Exp $ |
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*/ |
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#ifndef _SYS_FILE_H_ |
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#define _SYS_FILE_H_ |
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#ifndef _KERNEL |
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#include <sys/types.h> /* XXX */ |
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#include <sys/fcntl.h> |
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#include <sys/unistd.h> |
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#else |
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#include <sys/queue.h> |
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#include <sys/_lock.h> |
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#include <sys/_mutex.h> |
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struct stat; |
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struct thread; |
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struct uio; |
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struct knote; |
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struct vnode; |
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struct socket; |
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#endif /* _KERNEL */ |
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#define DTYPE_VNODE 1 /* file */ |
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#define DTYPE_SOCKET 2 /* communications endpoint */ |
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#define DTYPE_PIPE 3 /* pipe */ |
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#define DTYPE_FIFO 4 /* fifo (named pipe) */ |
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#define DTYPE_KQUEUE 5 /* event queue */ |
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#define DTYPE_CRYPTO 6 /* crypto */ |
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#ifdef _KERNEL |
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struct file; |
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struct ucred; |
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typedef int fo_rdwr_t(struct file *fp, struct uio *uio, |
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struct ucred *active_cred, int flags, |
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struct thread *td); |
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#define FOF_OFFSET 1 /* Use the offset in uio argument */ |
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typedef int fo_ioctl_t(struct file *fp, u_long com, void *data, |
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struct ucred *active_cred, struct thread *td); |
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typedef int fo_poll_t(struct file *fp, int events, |
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struct ucred *active_cred, struct thread *td); |
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typedef int fo_kqfilter_t(struct file *fp, struct knote *kn); |
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typedef int fo_stat_t(struct file *fp, struct stat *sb, |
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struct ucred *active_cred, struct thread *td); |
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typedef int fo_close_t(struct file *fp, struct thread *td); |
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typedef int fo_flags_t; |
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struct fileops { |
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fo_rdwr_t *fo_read; |
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fo_rdwr_t *fo_write; |
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fo_ioctl_t *fo_ioctl; |
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fo_poll_t *fo_poll; |
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fo_kqfilter_t *fo_kqfilter; |
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fo_stat_t *fo_stat; |
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fo_close_t *fo_close; |
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fo_flags_t fo_flags; /* DFLAG_* below */ |
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}; |
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#define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */ |
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#define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */ |
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/* |
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* Kernel descriptor table. |
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* One entry for each open kernel vnode and socket. |
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* |
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* Below is the list of locks that protects members in struct file. |
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* |
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* (fl) filelist_lock |
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* (f) f_mtx in struct file |
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* none not locked |
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*/ |
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105 |
|
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struct file { |
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LIST_ENTRY(file) f_list;/* (fl) list of active files */ |
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short f_type; /* descriptor type */ |
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void *f_data; /* file descriptor specific data */ |
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u_int f_flag; /* see fcntl.h */ |
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struct mtx *f_mtxp; /* mutex to protect data */ |
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struct fileops *f_ops; /* File operations */ |
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struct ucred *f_cred; /* credentials associated with descriptor */ |
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int f_count; /* (f) reference count */ |
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struct vnode *f_vnode; /* NULL or applicable vnode */ |
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116 |
|
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/* DFLAG_SEEKABLE specific fields */ |
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off_t f_offset; |
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119 |
|
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/* DTYPE_SOCKET specific fields */ |
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short f_gcflag; /* used by thread doing fd garbage collection */ |
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#define FMARK 0x1 /* mark during gc() */ |
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#define FDEFER 0x2 /* defer for next gc pass */ |
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int f_msgcount; /* (f) references from message queue */ |
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125 |
|
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/* DTYPE_VNODE specific fields */ |
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int f_seqcount; /* |
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* count of sequential accesses -- cleared |
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* by most seek operations. |
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*/ |
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off_t f_nextoff; /* |
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* offset of next expected read or write |
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*/ |
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void *f_label; /* Place-holder for struct label pointer. */ |
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}; |
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136 |
|
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#endif /* _KERNEL */ |
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138 |
|
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/* |
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* Userland version of struct file, for sysctl |
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*/ |
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struct xfile { |
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size_t xf_size; /* size of struct xfile */ |
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pid_t xf_pid; /* owning process */ |
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uid_t xf_uid; /* effective uid of owning process */ |
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int xf_fd; /* descriptor number */ |
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void *xf_file; /* address of struct file */ |
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short xf_type; /* descriptor type */ |
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int xf_count; /* reference count */ |
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int xf_msgcount; /* references from message queue */ |
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off_t xf_offset; /* file offset */ |
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void *xf_data; /* file descriptor specific data */ |
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void *xf_vnode; /* vnode pointer */ |
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u_int xf_flag; /* flags (see fcntl.h) */ |
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}; |
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156 |
|
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#ifdef _KERNEL |
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extern struct filelist filehead; /* (fl) head of list of open files */ |
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extern struct fileops vnops; |
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extern struct fileops badfileops; |
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extern struct fileops socketops; |
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extern int maxfiles; /* kernel limit on number of open files */ |
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extern int maxfilesperproc; /* per process limit on number of open files */ |
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extern int openfiles; /* (fl) actual number of open files */ |
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extern struct sx filelist_lock; /* sx to protect filelist and openfiles */ |
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166 |
|
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/* |
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* The socket operations are used a couple of places. |
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* XXX: This is wrong, they should go through the operations vector for |
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* XXX: sockets instead of going directly for the individual functions. /phk |
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*/ |
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fo_rdwr_t soo_read; |
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fo_rdwr_t soo_write; |
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fo_ioctl_t soo_ioctl; |
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fo_poll_t soo_poll; |
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fo_kqfilter_t soo_kqfilter; |
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fo_stat_t soo_stat; |
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fo_close_t soo_close; |
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179 |
|
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/* Lock a file. */ |
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#define FILE_LOCK(f) mtx_lock((f)->f_mtxp) |
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#define FILE_UNLOCK(f) mtx_unlock((f)->f_mtxp) |
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#define FILE_LOCKED(f) mtx_owned((f)->f_mtxp) |
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#define FILE_LOCK_ASSERT(f, type) mtx_assert((f)->f_mtxp, (type)) |
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185 |
|
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#define fhold_locked(fp) \ |
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do { \ |
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FILE_LOCK_ASSERT(fp, MA_OWNED); \ |
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(fp)->f_count++; \ |
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} while (0) |
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191 |
|
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#define fhold(fp) \ |
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do { \ |
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FILE_LOCK(fp); \ |
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(fp)->f_count++; \ |
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FILE_UNLOCK(fp); \ |
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} while (0) |
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198 |
|
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static __inline fo_rdwr_t fo_read; |
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static __inline fo_rdwr_t fo_write; |
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static __inline fo_ioctl_t fo_ioctl; |
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static __inline fo_poll_t fo_poll; |
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static __inline fo_kqfilter_t fo_kqfilter; |
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static __inline fo_stat_t fo_stat; |
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static __inline fo_close_t fo_close; |
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static __inline int |
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fo_read(fp, uio, active_cred, flags, td) |
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struct file *fp; |
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struct uio *uio; |
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struct ucred *active_cred; |
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int flags; |
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struct thread *td; |
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{ |
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return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td)); |
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} |
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static __inline int |
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fo_write(fp, uio, active_cred, flags, td) |
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struct file *fp; |
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struct uio *uio; |
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struct ucred *active_cred; |
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int flags; |
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struct thread *td; |
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{ |
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return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td)); |
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} |
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static __inline int |
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fo_ioctl(fp, com, data, active_cred, td) |
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struct file *fp; |
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u_long com; |
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void *data; |
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struct ucred *active_cred; |
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struct thread *td; |
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{ |
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return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td)); |
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} |
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static __inline int |
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fo_poll(fp, events, active_cred, td) |
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struct file *fp; |
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int events; |
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struct ucred *active_cred; |
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struct thread *td; |
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{ |
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|
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return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td)); |
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} |
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static __inline int |
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fo_stat(fp, sb, active_cred, td) |
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struct file *fp; |
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struct stat *sb; |
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struct ucred *active_cred; |
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struct thread *td; |
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{ |
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return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td)); |
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} |
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static __inline int |
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fo_close(fp, td) |
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struct file *fp; |
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struct thread *td; |
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{ |
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return ((*fp->f_ops->fo_close)(fp, td)); |
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} |
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static __inline int |
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fo_kqfilter(fp, kn) |
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struct file *fp; |
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struct knote *kn; |
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{ |
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return ((*fp->f_ops->fo_kqfilter)(fp, kn)); |
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} |
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#endif /* _KERNEL */ |
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#endif /* !SYS_FILE_H */ |