1 | /* |
2 | * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* |
29 | * Copyright (c) 1996 John S. Dyson |
30 | * All rights reserved. |
31 | * |
32 | * Redistribution and use in source and binary forms, with or without |
33 | * modification, are permitted provided that the following conditions |
34 | * are met: |
35 | * 1. Redistributions of source code must retain the above copyright |
36 | * notice immediately at the beginning of the file, without modification, |
37 | * this list of conditions, and the following disclaimer. |
38 | * 2. Redistributions in binary form must reproduce the above copyright |
39 | * notice, this list of conditions and the following disclaimer in the |
40 | * documentation and/or other materials provided with the distribution. |
41 | * 3. Absolutely no warranty of function or purpose is made by the author |
42 | * John S. Dyson. |
43 | * 4. This work was done expressly for inclusion into FreeBSD. Other use |
44 | * is allowed if this notation is included. |
45 | * 5. Modifications may be freely made to this file if the above conditions |
46 | * are met. |
47 | * |
48 | * $FreeBSD: src/sys/sys/pipe.h,v 1.24 2003/08/13 20:01:38 alc Exp $ |
49 | */ |
50 | /* |
51 | * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce |
52 | * support for mandatory and extensible security protections. This notice |
53 | * is included in support of clause 2.2 (b) of the Apple Public License, |
54 | * Version 2.0. |
55 | */ |
56 | |
57 | #ifndef _SYS_PIPE_H_ |
58 | #define _SYS_PIPE_H_ |
59 | |
60 | #ifdef KERNEL |
61 | #include <libkern/locks.h> |
62 | #endif |
63 | #include <sys/queue.h> /* for TAILQ macros */ |
64 | #include <sys/ev.h> |
65 | #include <sys/cdefs.h> |
66 | #include <sys/_types/_caddr_t.h> |
67 | #include <sys/_types/_u_int.h> |
68 | |
69 | /* |
70 | * Pipe buffer size, keep moderate in value, pipes take kva space. |
71 | */ |
72 | #ifndef PIPE_SIZE |
73 | #define PIPE_SIZE 16384 |
74 | #endif |
75 | |
76 | #define PIPE_KVAMAX (1024 * 1024 * 16) |
77 | |
78 | #ifndef BIG_PIPE_SIZE |
79 | #define BIG_PIPE_SIZE (64*1024) |
80 | #endif |
81 | |
82 | #ifndef SMALL_PIPE_SIZE |
83 | #define SMALL_PIPE_SIZE PAGE_SIZE |
84 | #endif |
85 | |
86 | /* |
87 | * PIPE_MINDIRECT MUST be smaller than PIPE_SIZE and MUST be bigger |
88 | * than PIPE_BUF. |
89 | */ |
90 | #ifndef PIPE_MINDIRECT |
91 | #define PIPE_MINDIRECT 8192 |
92 | #endif |
93 | |
94 | #define PIPENPAGES (BIG_PIPE_SIZE / PAGE_SIZE + 1) |
95 | |
96 | /* |
97 | * Pipe buffer information. |
98 | * Separate in, out, cnt are used to simplify calculations. |
99 | * Buffered write is active when the buffer.cnt field is set. |
100 | */ |
101 | struct pipebuf { |
102 | u_int cnt; /* number of chars currently in buffer */ |
103 | u_int in; /* in pointer */ |
104 | u_int out; /* out pointer */ |
105 | u_int size; /* size of buffer */ |
106 | caddr_t buffer; /* kva of buffer */ |
107 | }; |
108 | |
109 | |
110 | #ifdef PIPE_DIRECT |
111 | /* |
112 | * Information to support direct transfers between processes for pipes. |
113 | */ |
114 | struct pipemapping { |
115 | vm_offset_t kva; /* kernel virtual address */ |
116 | vm_size_t cnt; /* number of chars in buffer */ |
117 | vm_size_t pos; /* current position of transfer */ |
118 | int npages; /* number of pages */ |
119 | vm_page_t ms[PIPENPAGES]; /* pages in source process */ |
120 | }; |
121 | #endif |
122 | |
123 | /* |
124 | * Bits in pipe_state. |
125 | */ |
126 | #define PIPE_ASYNC 0x004 /* Async? I/O. */ |
127 | #define PIPE_WANTR 0x008 /* Reader wants some characters. */ |
128 | #define PIPE_WANTW 0x010 /* Writer wants space to put characters. */ |
129 | #define PIPE_WANT 0x020 /* Pipe is wanted to be run-down. */ |
130 | #define PIPE_SEL 0x040 /* Pipe has a select active. */ |
131 | #define PIPE_EOF 0x080 /* Pipe is in EOF condition. */ |
132 | #define PIPE_LOCKFL 0x100 /* Process has exclusive access to pointers/data. */ |
133 | #define PIPE_LWANT 0x200 /* Process wants exclusive access to pointers/data. */ |
134 | #define PIPE_DIRECTW 0x400 /* Pipe direct write active. */ |
135 | #define PIPE_DIRECTOK 0x800 /* Direct mode ok. */ |
136 | #define PIPE_KNOTE 0x1000 /* Pipe has kernel events activated */ |
137 | #define PIPE_DRAIN 0x2000 /* Waiting for I/O to drop for a close. Treated like EOF; |
138 | only separate for easier debugging. */ |
139 | #define PIPE_WSELECT 0x4000 /* Some thread has done an FWRITE select on the pipe */ |
140 | #define PIPE_DEAD 0x8000 /* Pipe is dead and needs garbage collection */ |
141 | |
142 | #ifdef KERNEL |
143 | |
144 | struct label; |
145 | |
146 | /* |
147 | * Per-pipe data structure. |
148 | * Two of these are linked together to produce bi-directional pipes. |
149 | */ |
150 | struct pipe { |
151 | struct pipebuf pipe_buffer; /* data storage */ |
152 | #ifdef PIPE_DIRECT |
153 | struct pipemapping pipe_map; /* pipe mapping for direct I/O */ |
154 | #endif |
155 | struct selinfo pipe_sel; /* for compat with select */ |
156 | pid_t pipe_pgid; /* information for async I/O */ |
157 | struct pipe *pipe_peer; /* link with other direction */ |
158 | u_int pipe_state; /* pipe status info */ |
159 | int pipe_busy; /* busy flag, mostly to handle rundown sanely */ |
160 | TAILQ_HEAD(,eventqelt) pipe_evlist; |
161 | lck_mtx_t *pipe_mtxp; /* shared mutex between both pipes */ |
162 | struct timespec st_atimespec; /* time of last access */ |
163 | struct timespec st_mtimespec; /* time of last data modification */ |
164 | struct timespec st_ctimespec; /* time of last status change */ |
165 | struct label *pipe_label; /* pipe MAC label - shared */ |
166 | }; |
167 | |
168 | #define PIPE_MTX(pipe) ((pipe)->pipe_mtxp) |
169 | |
170 | #define PIPE_LOCK(pipe) lck_mtx_lock(PIPE_MTX(pipe)) |
171 | #define PIPE_UNLOCK(pipe) lck_mtx_unlock(PIPE_MTX(pipe)) |
172 | #define PIPE_LOCK_ASSERT(pipe, type) LCK_MTX_ASSERT(PIPE_MTX(pipe), (type)) |
173 | |
174 | __BEGIN_DECLS |
175 | void pipeinit(void); |
176 | extern int pipe_stat(struct pipe *, void *, int); |
177 | __END_DECLS |
178 | |
179 | #endif /* KERNEL */ |
180 | |
181 | #endif /* !_SYS_PIPE_H_ */ |
182 | |