| | 1 | /* |
| | 2 | * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| | 7 | * |
| | 8 | * This file contains Original Code and/or Modifications of Original Code |
| | 9 | * as defined in and that are subject to the Apple Public Source License |
| | 10 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 11 | * compliance with the License. Please obtain a copy of the License at |
| | 12 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| | 13 | * file. |
| | 14 | * |
| | 15 | * The Original Code and all software distributed under the License are |
| | 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 20 | * Please see the License for the specific language governing rights and |
| | 21 | * limitations under the License. |
| | 22 | * |
| | 23 | * @APPLE_LICENSE_HEADER_END@ |
| | 24 | */ |
| | 25 | /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */ |
| | 26 | /* |
| | 27 | * Copyright (c) 1990, 1993 |
| | 28 | * The Regents of the University of California. All rights reserved. |
| | 29 | * |
| | 30 | * Redistribution and use in source and binary forms, with or without |
| | 31 | * modification, are permitted provided that the following conditions |
| | 32 | * are met: |
| | 33 | * 1. Redistributions of source code must retain the above copyright |
| | 34 | * notice, this list of conditions and the following disclaimer. |
| | 35 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 36 | * notice, this list of conditions and the following disclaimer in the |
| | 37 | * documentation and/or other materials provided with the distribution. |
| | 38 | * 3. All advertising materials mentioning features or use of this software |
| | 39 | * must display the following acknowledgement: |
| | 40 | * This product includes software developed by the University of |
| | 41 | * California, Berkeley and its contributors. |
| | 42 | * 4. Neither the name of the University nor the names of its contributors |
| | 43 | * may be used to endorse or promote products derived from this software |
| | 44 | * without specific prior written permission. |
| | 45 | * |
| | 46 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 47 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 48 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 49 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 50 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 51 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 52 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 53 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 54 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 55 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 56 | * SUCH DAMAGE. |
| | 57 | * |
| | 58 | * @(#)filedesc.h 8.1 (Berkeley) 6/2/93 |
| | 59 | */ |
| | 60 | |
| | 61 | #ifndef _SYS_FILEDESC_H_ |
| | 62 | #define _SYS_FILEDESC_H_ |
| | 63 | |
| | 64 | #include <sys/appleapiopts.h> |
| | 65 | |
| | 66 | #ifdef __APPLE_API_UNSTABLE |
| | 67 | /* |
| | 68 | * This structure is used for the management of descriptors. It may be |
| | 69 | * shared by multiple processes. |
| | 70 | * |
| | 71 | * A process is initially started out with NDFILE descriptors [XXXstored within |
| | 72 | * this structureXXX], selected to be enough for typical applications based on |
| | 73 | * the historical limit of 20 open files (and the usage of descriptors by |
| | 74 | * shells). If these descriptors are exhausted, a larger descriptor table |
| | 75 | * may be allocated, up to a process' resource limit; [XXXthe internal arrays |
| | 76 | * are then unusedXXX]. The initial expansion is set to NDEXTENT; each time |
| | 77 | * it runs out, it is doubled until the resource limit is reached. NDEXTENT |
| | 78 | * should be selected to be the biggest multiple of OFILESIZE (see below) |
| | 79 | * that will fit in a power-of-two sized piece of memory. |
| | 80 | */ |
| | 81 | #define NDFILE 25 /* 125 bytes */ |
| | 82 | #define NDEXTENT 50 /* 250 bytes in 256-byte alloc. */ |
| | 83 | |
| | 84 | struct filedesc { |
| | 85 | struct file **fd_ofiles; /* file structures for open files */ |
| | 86 | char *fd_ofileflags; /* per-process open file flags */ |
| | 87 | struct vnode *fd_cdir; /* current directory */ |
| | 88 | struct vnode *fd_rdir; /* root directory */ |
| | 89 | int fd_nfiles; /* number of open files allocated */ |
| | 90 | u_short fd_lastfile; /* high-water mark of fd_ofiles */ |
| | 91 | u_short fd_freefile; /* approx. next free file */ |
| | 92 | u_short fd_cmask; /* mask for file creation */ |
| | 93 | u_short fd_refcnt; /* reference count */ |
| | 94 | }; |
| | 95 | |
| | 96 | /* |
| | 97 | * Per-process open flags. |
| | 98 | */ |
| | 99 | #define UF_EXCLOSE 0x01 /* auto-close on exec */ |
| | 100 | #define UF_MAPPED 0x02 /* mapped from device */ |
| | 101 | #define UF_RESERVED 0x04 /* open pending / in progress */ |
| | 102 | |
| | 103 | /* |
| | 104 | * Storage required per open file descriptor. |
| | 105 | */ |
| | 106 | #define OFILESIZE (sizeof(struct file *) + sizeof(char)) |
| | 107 | |
| | 108 | #ifdef KERNEL |
| | 109 | /* |
| | 110 | * Kernel global variables and routines. |
| | 111 | */ |
| | 112 | extern int dupfdopen __P((struct filedesc *fdp, |
| | 113 | int indx, int dfd, int mode, int error)); |
| | 114 | extern int fdalloc __P((struct proc *p, int want, int *result)); |
| | 115 | extern void fdrelse __P((struct proc *p, int fd)); |
| | 116 | extern int fdavail __P((struct proc *p, int n)); |
| | 117 | extern int fdgetf __P((struct proc *p, int fd, struct file **resultfp)); |
| | 118 | #define fdfile(p, fd) \ |
| | 119 | (&(p)->p_fd->fd_ofiles[(fd)]) |
| | 120 | #define fdflags(p, fd) \ |
| | 121 | (&(p)->p_fd->fd_ofileflags[(fd)]) |
| | 122 | extern int falloc __P((struct proc *p, |
| | 123 | struct file **resultfp, int *resultfd)); |
| | 124 | extern void ffree __P((struct file *fp)); |
| | 125 | |
| | 126 | #ifdef __APPLE_API_PRIVATE |
| | 127 | extern struct filedesc *fdcopy __P((struct proc *p)); |
| | 128 | extern void fdfree __P((struct proc *p)); |
| | 129 | extern void fdexec __P((struct proc *p)); |
| | 130 | #endif /* __APPLE_API_PRIVATE */ |
| | 131 | |
| | 132 | #endif /* KERNEL */ |
| | 133 | |
| | 134 | #endif /* __APPLE_API_UNSTABLE */ |
| | 135 | |
| | 136 | #endif /* !_SYS_FILEDESC_H_ */ |
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