1 /* 2 * Copyright (c) 1982, 1986, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)file.h 7.8 (Berkeley) 04/15/91 8 */ 9 10 #include <sys/fcntl.h> 11 #include <sys/unistd.h> 12 13 #ifdef KERNEL 14 /* 15 * Kernel descriptor table entry; 16 * one for each open kernel vnode and socket. 17 */ 18 struct file { 19 int f_flag; /* see below */ 20 #define DTYPE_VNODE 1 /* file */ 21 #define DTYPE_SOCKET 2 /* communications endpoint */ 22 short f_type; /* descriptor type */ 23 short f_count; /* reference count */ 24 short f_msgcount; /* references from message queue */ 25 struct ucred *f_cred; /* credentials associated with descriptor */ 26 struct fileops { 27 int (*fo_read)__P(( 28 struct file *fp, 29 struct uio *uio, 30 struct ucred *cred)); 31 int (*fo_write)__P(( 32 struct file *fp, 33 struct uio *uio, 34 struct ucred *cred)); 35 int (*fo_ioctl)__P(( 36 struct file *fp, 37 int com, 38 caddr_t data, 39 struct proc *p)); 40 int (*fo_select)__P(( 41 struct file *fp, 42 int which, 43 struct proc *p)); 44 int (*fo_close)__P(( 45 struct file *fp, 46 struct proc *p)); 47 } *f_ops; 48 caddr_t f_data; /* inode */ 49 off_t f_offset; 50 }; 51 52 struct file *file, *fileNFILE; 53 int nfile; 54 55 #endif /* KERNEL */ 56