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

     /*
      * 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
     * $FreeBSD: src/sys/sys/file.h,v 1.8.2.2 1999/09/05 08:22:19 peter Exp $
     */
    
    #ifndef _SYS_FILE_H_
    #define _SYS_FILE_H_
    
    #include <sys/fcntl.h>
    #ifndef KERNEL
    #include <sys/unistd.h>
    #endif
    
    #ifdef KERNEL
    #include <sys/queue.h>
    
    struct proc;
    struct uio;
    
    /*
     * 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_PIPE      3       /* pipe */
    #define DTYPE_FIFO      4       /* fifo (named pipe) */
            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     (*fo_write)     __P((struct file *fp, struct uio *uio,
                                                struct ucred *cred));
                    int     (*fo_ioctl)     __P((struct file *fp, int com,
                                                caddr_t data, struct proc *p));
                    int     (*fo_select)    __P((struct file *fp, int which,
                                                struct proc *p));
                    int     (*fo_close)     __P((struct file *fp, struct proc *p));
            } *f_ops;
            off_t   f_offset;
            caddr_t f_data;         /* vnode or socket */
    };
    
    LIST_HEAD(filelist, file);
    extern struct filelist filehead; /* head of list of open files */
    extern struct fileops vnops;
    extern int maxfiles;            /* kernel limit on number of open files */
    extern int maxfilesperproc;     /* per process limit on number of open files */
    extern int nfiles;              /* actual number of open files */
    
    #endif /* KERNEL */
    
    #endif /* !SYS_FILE_H */

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