/* * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */ /* * Copyright (c) 1990, 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. 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. * * @(#)filedesc.h 8.1 (Berkeley) 6/2/93 */ #ifndef _SYS_FILEDESC_H_ #define _SYS_FILEDESC_H_ #include <sys/appleapiopts.h> #ifdef __APPLE_API_UNSTABLE /* * This structure is used for the management of descriptors. It may be * shared by multiple processes. * * A process is initially started out with NDFILE descriptors [XXXstored within * this structureXXX], selected to be enough for typical applications based on * the historical limit of 20 open files (and the usage of descriptors by * shells). If these descriptors are exhausted, a larger descriptor table * may be allocated, up to a process' resource limit; [XXXthe internal arrays * are then unusedXXX]. The initial expansion is set to NDEXTENT; each time * it runs out, it is doubled until the resource limit is reached. NDEXTENT * should be selected to be the biggest multiple of OFILESIZE (see below) * that will fit in a power-of-two sized piece of memory. */ #define NDFILE 25 /* 125 bytes */ #define NDEXTENT 50 /* 250 bytes in 256-byte alloc. */ struct klist; struct filedesc { struct fileproc **fd_ofiles; /* file structures for open files */ char *fd_ofileflags; /* per-process open file flags */ struct vnode *fd_cdir; /* current directory */ struct vnode *fd_rdir; /* root directory */ int fd_nfiles; /* number of open files allocated */ u_short fd_lastfile; /* high-water mark of fd_ofiles */ u_short fd_freefile; /* approx. next free file */ u_short fd_cmask; /* mask for file creation */ u_short fd_refcnt; /* reference count */ int fd_knlistsize; /* size of knlist */ struct klist *fd_knlist; /* list of attached knotes */ u_long fd_knhashmask; /* size of knhash */ struct klist *fd_knhash; /* hash table for attached knotes */ int fd_flags; }; /* * definitions for fd_flags; */ #define FD_CHROOT 0x01 /* process was chrooted... keep track even */ /* if we're force unmounted and unable to */ /* take a vnode_ref on fd_rdir during a fork */ /* * Per-process open flags. */ #define UF_EXCLOSE 0x01 /* auto-close on exec */ #define UF_RESERVED 0x04 /* open pending / in progress */ #define UF_CLOSING 0x08 /* close in progress */ /* * Storage required per open file descriptor. */ #define OFILESIZE (sizeof(struct file *) + sizeof(char)) #ifdef KERNEL /* * Kernel global variables and routines. */ extern int dupfdopen(struct filedesc *fdp, int indx, int dfd, int mode, int error); extern int fdalloc(struct proc *p, int want, int *result); extern void fdrelse(struct proc *p, int fd); extern int fdavail(struct proc *p, int n); #define fdfile(p, fd) \ (&(p)->p_fd->fd_ofiles[(fd)]) #define fdflags(p, fd) \ (&(p)->p_fd->fd_ofileflags[(fd)]) extern int falloc(struct proc *p, struct fileproc **resultfp, int *resultfd); extern void ffree(struct file *fp); #ifdef __APPLE_API_PRIVATE extern struct filedesc *fdcopy(struct proc *p); extern void fdfree(struct proc *p); extern void fdexec(struct proc *p); #endif /* __APPLE_API_PRIVATE */ #endif /* KERNEL */ #endif /* __APPLE_API_UNSTABLE */ #endif /* !_SYS_FILEDESC_H_ */