include/sys/file.h
C Header | 169 lines | 83 code | 16 blank | 70 comment | 0 complexity | b44ce288fa4674253b8e65e32b077f7c MD5 | raw file
Possible License(s): MIT, WTFPL, AGPL-1.0, BSD-3-Clause, GPL-3.0, LGPL-2.0, JSON, 0BSD
- /* $NetBSD: file.h,v 1.71 2009/12/24 19:01:12 elad Exp $ */
- /*-
- * Copyright (c) 2009 The NetBSD Foundation, Inc.
- * All rights reserved.
- *
- * This code is derived from software contributed to The NetBSD Foundation
- * by Andrew Doran.
- *
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
- */
- /*
- * 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. 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
- */
- #ifndef _SYS_FILE_H_
- #define _SYS_FILE_H_
- #include <sys/fcntl.h>
- #include <sys/unistd.h>
- #ifdef _KERNEL
- #include <sys/mallocvar.h>
- #include <sys/queue.h>
- #include <sys/mutex.h>
- #include <sys/condvar.h>
- struct proc;
- struct lwp;
- struct uio;
- struct iovec;
- struct stat;
- struct knote;
- /*
- * Kernel file descriptor. One entry for each open kernel vnode and
- * socket.
- *
- * This structure is exported via the KERN_FILE and KERN_FILE2 sysctl
- * calls. Only add members to the end, do not delete them.
- */
- struct file {
- off_t f_offset; /* first, is 64-bit */
- kauth_cred_t f_cred; /* creds associated with descriptor */
- const struct fileops {
- int (*fo_read) (struct file *, off_t *, struct uio *,
- kauth_cred_t, int);
- int (*fo_write) (struct file *, off_t *, struct uio *,
- kauth_cred_t, int);
- int (*fo_ioctl) (struct file *, u_long, void *);
- int (*fo_fcntl) (struct file *, u_int, void *);
- int (*fo_poll) (struct file *, int);
- int (*fo_stat) (struct file *, struct stat *);
- int (*fo_close) (struct file *);
- int (*fo_kqfilter) (struct file *, struct knote *);
- void (*fo_restart) (struct file *);
- void (*fo_spare1) (void);
- void (*fo_spare2) (void);
- } *f_ops;
- void *f_data; /* descriptor data, e.g. vnode/socket */
- LIST_ENTRY(file) f_list; /* list of active files */
- kmutex_t f_lock; /* lock on structure */
- int f_flag; /* see fcntl.h */
- u_int f_marker; /* traversal marker (sysctl) */
- #define DTYPE_VNODE 1 /* file */
- #define DTYPE_SOCKET 2 /* communications endpoint */
- #define DTYPE_PIPE 3 /* pipe */
- #define DTYPE_KQUEUE 4 /* event queue */
- #define DTYPE_MISC 5 /* misc file descriptor type */
- #define DTYPE_CRYPTO 6 /* crypto */
- #define DTYPE_MQUEUE 7 /* message queue */
- #define DTYPE_NAMES \
- "0", "file", "socket", "pipe", "kqueue", "misc", "crypto", "mqueue"
- u_int f_type; /* descriptor type */
- u_int f_advice; /* access pattern hint; UVM_ADV_* */
- u_int f_count; /* reference count */
- u_int f_msgcount; /* references from message queue */
- u_int f_unpcount; /* deferred close: see uipc_usrreq.c */
- SLIST_ENTRY(file) f_unplist; /* deferred close: see uipc_usrreq.c */
- };
- /*
- * Flags for fo_read and fo_write and do_fileread/write/v
- */
- #define FOF_UPDATE_OFFSET 0x0001 /* update the file offset */
- #define FOF_IOV_SYSSPACE 0x0100 /* iov structure in kernel memory */
- LIST_HEAD(filelist, file);
- extern struct filelist filehead; /* head of list of open files */
- extern u_int maxfiles; /* kernel limit on # of open files */
- extern u_int nfiles; /* actual number of open files */
- extern const struct fileops vnops; /* vnode operations for files */
- int dofileread(int, struct file *, void *, size_t,
- off_t *, int, register_t *);
- int dofilewrite(int, struct file *, const void *,
- size_t, off_t *, int, register_t *);
- int do_filereadv(int, const struct iovec *, int, off_t *,
- int, register_t *);
- int do_filewritev(int, const struct iovec *, int, off_t *,
- int, register_t *);
- int fsetown(pid_t *, u_long, const void *);
- int fgetown(pid_t, u_long, void *);
- void fownsignal(pid_t, int, int, int, void *);
- /* Commonly used fileops */
- int fnullop_fcntl(struct file *, u_int, void *);
- int fnullop_poll(struct file *, int);
- int fnullop_kqfilter(struct file *, struct knote *);
- int fbadop_read(struct file *, off_t *, struct uio *, kauth_cred_t, int);
- int fbadop_write(struct file *, off_t *, struct uio *, kauth_cred_t, int);
- int fbadop_ioctl(struct file *, u_long, void *);
- int fbadop_close(struct file *);
- int fbadop_stat(struct file *, struct stat *);
- void fnullop_restart(struct file *);
- #endif /* _KERNEL */
- #endif /* _SYS_FILE_H_ */