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Text File | 1992-09-04 | 3.1 KB | 74 lines | [TEXT/UNIX] |
- /*
- * Copyright (c) 1982, 1986, 1989 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 7.10 (Berkeley) 6/4/91
- */
-
- #include <sys/fcntl.h>
- #include <sys/unistd.h>
-
- #ifdef KERNEL
- /*
- * Kernel descriptor table.
- * One entry for each open kernel vnode and socket.
- */
- struct file {
- struct file *f_filef; /* list of active files */
- struct file **f_fileb; /* list of active files */
- short f_flag; /* see fcntl.h */
- #define DTYPE_VNODE 1 /* file */
- #define DTYPE_SOCKET 2 /* communications endpoint */
- 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 */
- };
-
- extern struct file *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 /* KERNEL */
-