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Annotation of Net2/sys/file.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)file.h      7.10 (Berkeley) 6/4/91
        !            34:  */
        !            35: 
        !            36: #include <sys/fcntl.h>
        !            37: #include <sys/unistd.h>
        !            38: 
        !            39: #ifdef KERNEL
        !            40: /*
        !            41:  * Kernel descriptor table.
        !            42:  * One entry for each open kernel vnode and socket.
        !            43:  */
        !            44: struct file {
        !            45:        struct  file *f_filef;  /* list of active files */
        !            46:        struct  file **f_fileb; /* list of active files */
        !            47:        short   f_flag;         /* see fcntl.h */
        !            48: #define        DTYPE_VNODE     1       /* file */
        !            49: #define        DTYPE_SOCKET    2       /* communications endpoint */
        !            50:        short   f_type;         /* descriptor type */
        !            51:        short   f_count;        /* reference count */
        !            52:        short   f_msgcount;     /* references from message queue */
        !            53:        struct  ucred *f_cred;  /* credentials associated with descriptor */
        !            54:        struct  fileops {
        !            55:                int     (*fo_read)      __P((struct file *fp, struct uio *uio,
        !            56:                                            struct ucred *cred));
        !            57:                int     (*fo_write)     __P((struct file *fp, struct uio *uio,
        !            58:                                            struct ucred *cred));
        !            59:                int     (*fo_ioctl)     __P((struct file *fp, int com,
        !            60:                                            caddr_t data, struct proc *p));
        !            61:                int     (*fo_select)    __P((struct file *fp, int which,
        !            62:                                            struct proc *p));
        !            63:                int     (*fo_close)     __P((struct file *fp, struct proc *p));
        !            64:        } *f_ops;
        !            65:        off_t   f_offset;
        !            66:        caddr_t f_data;         /* vnode or socket */
        !            67: };
        !            68: 
        !            69: extern struct file *filehead;  /* head of list of open files */
        !            70: extern int maxfiles;           /* kernel limit on number of open files */
        !            71: extern int nfiles;             /* actual number of open files */
        !            72: 
        !            73: #endif /* KERNEL */

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