FreeBSD/Linux Kernel Cross Reference
sys/bsd/sys/file.h

     /*
      * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
    /*
     * Copyright (c) 1982, 1986, 1989, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * 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 University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
     *
     *      @(#)file.h      8.3 (Berkeley) 1/9/95
     */
    
    #ifndef _SYS_FILE_H_
    #define _SYS_FILE_H_
    
    #include <sys/appleapiopts.h>
    #include <sys/fcntl.h>
    #include <sys/unistd.h>
    
    #ifdef KERNEL
    #include <sys/errno.h>
    #include <sys/queue.h>
    #include <sys/cdefs.h>
    
    struct proc;
    struct uio;
    struct knote;
    #ifdef __APPLE_API_UNSTABLE
    
    /*
     * Kernel descriptor table.
     * One entry for each open kernel vnode and socket.
     */
    struct file {
            LIST_ENTRY(file) f_list;/* list of active files */
            short   f_flag;         /* see fcntl.h */
    #define DTYPE_VNODE     1       /* file */
    #define DTYPE_SOCKET    2       /* communications endpoint */
    #define DTYPE_PSXSHM    3       /* POSIX Shared memory */
    #define DTYPE_PSXSEM    4       /* POSIX Semaphores */
    #define DTYPE_KQUEUE    5       /* kqueue */
            short   f_type;         /* descriptor type */
            short   f_count;        /* reference count */
            short   f_msgcount;     /* references from message queue */
            struct  ucred *f_cred;  /* credentials associated with descriptor */
            struct  fileops {
                    int     (*fo_read)      __P((struct file *fp, struct uio *uio,
                                                struct ucred *cred, int flags,
                                                struct proc *p));
                    int     (*fo_write)     __P((struct file *fp, struct uio *uio,
                                                struct ucred *cred, int flags,
                                               struct proc *p));
   #define FOF_OFFSET      1
                   int     (*fo_ioctl)     __P((struct file *fp, u_long com,
                                               caddr_t data, struct proc *p));
                   int     (*fo_select)    __P((struct file *fp, int which,
                                                   void *wql, struct proc *p));
                   int     (*fo_close)     __P((struct file *fp, struct proc *p));
                   int     (*fo_kqfilter)  __P((struct file *fp, struct knote *kn,
                                                struct proc *p));
           } *f_ops;
           off_t   f_offset;
           caddr_t f_data;         /* vnode or socket or SHM or semaphore */
   };
   
   #ifdef __APPLE_API_PRIVATE
   LIST_HEAD(filelist, file);
   extern struct filelist filehead;        /* head of list of open files */
   extern int maxfiles;                    /* kernel limit on number of open files */
   extern int nfiles;                      /* actual number of open files */
   #endif /* __APPLE_API_PRIVATE */
   
   __BEGIN_DECLS
   int fref __P((struct file *));  /* take a reference on file pointer */
   int frele __P((struct file *)); /* release a reference on file pointer */
   int fcount __P((struct file *));        /* returns the reference count */
   
   static __inline int fo_read __P((struct file *fp, struct uio *uio,
           struct ucred *cred, int flags, struct proc *p));
   static __inline int fo_write __P((struct file *fp, struct uio *uio,
           struct ucred *cred, int flags, struct proc *p));
   static __inline int fo_ioctl __P((struct file *fp, u_long com, caddr_t data,
           struct proc *p));
   static __inline int fo_select __P((struct file *fp, int which, void *wql,
           struct proc *p));
   static __inline int fo_close __P((struct file *fp, struct proc *p));
   static __inline int fo_kqfilter __P((struct file *fp, struct knote *kn,
           struct proc *p));
   
   static __inline int
   fo_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p)
   {
           int error;
   
           if ((error = fref(fp)) == -1)
                   return (EBADF);
           error = (*fp->f_ops->fo_read)(fp, uio, cred, flags, p);
           frele(fp);
           return (error);
   }
   
   static __inline int
   fo_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p)
   {
           int error;
   
           if ((error = fref(fp)) == -1)
                   return (EBADF);
           error = (*fp->f_ops->fo_write)(fp, uio, cred, flags, p);
           frele(fp);
           return (error);
   }
   
   static __inline int 
   fo_ioctl(struct file *fp, u_long com, caddr_t data, struct proc *p)
   {
           int error;   
   
           if ((error = fref(fp)) == -1)
                   return (EBADF);
           error = (*fp->f_ops->fo_ioctl)(fp, com, data, p);
           frele(fp);
           return (error);
   }       
   
   static __inline int
   fo_select(struct file *fp, int which, void *wql, struct proc *p)
   {       
           int error;
   
           error = (*fp->f_ops->fo_select)(fp, which, wql, p);
           return (error);
   }
   
   static __inline int
   fo_close(struct file *fp, struct proc *p)
   {       
   
           return ((*fp->f_ops->fo_close)(fp, p));
   }
   
   static __inline int
   fo_kqfilter(struct file *fp, struct knote *kn, struct proc *p)
   {
           return ((*fp->f_ops->fo_kqfilter)(fp, kn, p));
   }
   
   __END_DECLS
   
   #endif /* __APPLE_API_UNSTABLE */
   
   #endif /* KERNEL */
   
   #endif /* !_SYS_FILE_H_ */

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