/* $NetBSD: file.h,v 1.74 2011/04/24 18:46:24 rmind 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 #include #ifdef _KERNEL #include #include #include 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) */ 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 */ }; /* * Descriptor types. */ #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_SEM 8 /* semaphore */ #define DTYPE_NAMES \ "0", "file", "socket", "pipe", "kqueue", "misc", "crypto", "mqueue", \ "semaphore" /* * 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 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_ */