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Annotation of Net2/sys/file.h, revision 1.1.1.1

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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