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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
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: /*
65: * This structure is used for the management of descriptors. It may be
66: * shared by multiple processes.
67: *
68: * A process is initially started out with NDFILE descriptors [XXXstored within
69: * this structureXXX], selected to be enough for typical applications based on
70: * the historical limit of 20 open files (and the usage of descriptors by
71: * shells). If these descriptors are exhausted, a larger descriptor table
72: * may be allocated, up to a process' resource limit; [XXXthe internal arrays
73: * are then unusedXXX]. The initial expansion is set to NDEXTENT; each time
74: * it runs out, it is doubled until the resource limit is reached. NDEXTENT
75: * should be selected to be the biggest multiple of OFILESIZE (see below)
76: * that will fit in a power-of-two sized piece of memory.
77: */
78: #define NDFILE 25 /* 125 bytes */
79: #define NDEXTENT 50 /* 250 bytes in 256-byte alloc. */
80:
81: struct filedesc {
82: struct file **fd_ofiles; /* file structures for open files */
83: char *fd_ofileflags; /* per-process open file flags */
84: struct vnode *fd_cdir; /* current directory */
85: struct vnode *fd_rdir; /* root directory */
86: int fd_nfiles; /* number of open files allocated */
87: u_short fd_lastfile; /* high-water mark of fd_ofiles */
88: u_short fd_freefile; /* approx. next free file */
89: u_short fd_cmask; /* mask for file creation */
90: u_short fd_refcnt; /* reference count */
91: };
92:
93: /*
94: * Per-process open flags.
95: */
96: #define UF_EXCLOSE 0x01 /* auto-close on exec */
97: #define UF_MAPPED 0x02 /* mapped from device */
98: #define UF_RESERVED 0x04 /* open pending / in progress */
99:
100: /*
101: * Storage required per open file descriptor.
102: */
103: #define OFILESIZE (sizeof(struct file *) + sizeof(char))
104:
105: #ifdef _KERNEL
106: /*
107: * Kernel global variables and routines.
108: */
109: extern int dupfdopen __P((struct filedesc *fdp,
110: int indx, int dfd, int mode, int error));
111: extern int fdalloc __P((struct proc *p, int want, int *result));
112: extern void fdrelse __P((struct proc *p, int fd));
113: extern int fdavail __P((struct proc *p, int n));
114: extern int fdgetf __P((struct proc *p, int fd, struct file **resultfp));
115: #define fdfile(p, fd) \
116: (&(p)->p_fd->fd_ofiles[(fd)])
117: #define fdflags(p, fd) \
118: (&(p)->p_fd->fd_ofileflags[(fd)])
119: extern int falloc __P((struct proc *p,
120: struct file **resultfp, int *resultfd));
121: extern void ffree __P((struct file *fp));
122: extern struct filedesc *fdcopy __P((struct proc *p));
123: extern void fdfree __P((struct proc *p));
124: extern void fdexec __P((struct proc *p));
125:
126: #endif /* _KERNEL */
127:
128: #endif /* !_SYS_FILEDESC_H_ */
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