| | 1 | /* |
| | 2 | * Copyright (c) 1996 John S. Dyson |
| | 3 | * All rights reserved. |
| | 4 | * |
| | 5 | * Redistribution and use in source and binary forms, with or without |
| | 6 | * modification, are permitted provided that the following conditions |
| | 7 | * are met: |
| | 8 | * 1. Redistributions of source code must retain the above copyright |
| | 9 | * notice immediately at the beginning of the file, without modification, |
| | 10 | * this list of conditions, and the following disclaimer. |
| | 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 12 | * notice, this list of conditions and the following disclaimer in the |
| | 13 | * documentation and/or other materials provided with the distribution. |
| | 14 | * 3. Absolutely no warranty of function or purpose is made by the author |
| | 15 | * John S. Dyson. |
| | 16 | * 4. This work was done expressly for inclusion into FreeBSD. Other use |
| | 17 | * is allowed if this notation is included. |
| | 18 | * 5. Modifications may be freely made to this file if the above conditions |
| | 19 | * are met. |
| | 20 | * |
| | 21 | * $FreeBSD: src/sys/sys/pipe.h,v 1.16 1999/12/29 04:24:45 peter Exp $ |
| | 22 | * $DragonFly: src/sys/sys/pipe.h,v 1.10 2006/06/10 20:00:17 dillon Exp $ |
| | 23 | */ |
| | 24 | |
| | 25 | #ifndef _SYS_PIPE_H_ |
| | 26 | #define _SYS_PIPE_H_ |
| | 27 | |
| | 28 | #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) |
| | 29 | |
| | 30 | #ifndef _SYS_TYPES_H_ |
| | 31 | #include <sys/types.h> |
| | 32 | #endif |
| | 33 | #ifndef _SYS_TIME_H_ |
| | 34 | #include <sys/time.h> /* for struct timespec */ |
| | 35 | #endif |
| | 36 | #ifndef _SYS_SELINFO_H_ |
| | 37 | #include <sys/selinfo.h> /* for struct selinfo */ |
| | 38 | #endif |
| | 39 | #ifndef _SYS_XIO_H_ |
| | 40 | #include <sys/xio.h> /* for struct xio */ |
| | 41 | #endif |
| | 42 | #ifndef _MACHINE_PARAM_H_ |
| | 43 | #include <machine/param.h> /* for PAGE_SIZE */ |
| | 44 | #endif |
| | 45 | |
| | 46 | /* |
| | 47 | * Pipe buffer size, keep moderate in value, pipes take kva space. |
| | 48 | * Must be a multiple of PAGE_SIZE. |
| | 49 | */ |
| | 50 | #ifndef PIPE_SIZE |
| | 51 | #define PIPE_SIZE 16384 |
| | 52 | #endif |
| | 53 | |
| | 54 | #ifndef BIG_PIPE_SIZE |
| | 55 | #define BIG_PIPE_SIZE (64*1024) |
| | 56 | #endif |
| | 57 | |
| | 58 | #if PIPE_SIZE < PAGE_SIZE |
| | 59 | #error "PIPE_SIZE is too small for this architecture" |
| | 60 | #endif |
| | 61 | |
| | 62 | /* |
| | 63 | * Pipe buffer information. |
| | 64 | * Separate in, out, cnt are used to simplify calculations. |
| | 65 | * Buffered write is active when the buffer.cnt field is set. |
| | 66 | */ |
| | 67 | struct pipebuf { |
| | 68 | u_int rindex; /* FIFO read index */ |
| | 69 | u_int windex; /* FIFO write index */ |
| | 70 | u_int size; /* size of buffer */ |
| | 71 | caddr_t buffer; /* kva of buffer */ |
| | 72 | struct vm_object *object; /* VM object containing buffer */ |
| | 73 | }; |
| | 74 | |
| | 75 | /* |
| | 76 | * Bits in pipe_state. |
| | 77 | */ |
| | 78 | #define PIPE_ASYNC 0x0004 /* Async? I/O */ |
| | 79 | #define PIPE_WANTR 0x0008 /* Reader wants some characters */ |
| | 80 | #define PIPE_WANTW 0x0010 /* Writer wants space to put characters */ |
| | 81 | #define PIPE_WANT 0x0020 /* Pipe is wanted to be run-down */ |
| | 82 | #define PIPE_SEL 0x0040 /* Pipe has a select active */ |
| | 83 | #define PIPE_EOF 0x0080 /* Pipe is in EOF condition */ |
| | 84 | #define PIPE_LOCK 0x0100 /* Process has exclusive access to pts/data */ |
| | 85 | #define PIPE_LWANT 0x0200 /* Process wants exclusive access to pts/data */ |
| | 86 | |
| | 87 | /* |
| | 88 | * Per-pipe data structure. |
| | 89 | * Two of these are linked together to produce bi-directional pipes. |
| | 90 | */ |
| | 91 | struct pipe { |
| | 92 | struct pipebuf pipe_buffer; /* data storage */ |
| | 93 | vm_offset_t pipe_kva; /* kva mapping (testing only) */ |
| | 94 | struct selinfo pipe_sel; /* for compat with select */ |
| | 95 | struct timespec pipe_atime; /* time of last access */ |
| | 96 | struct timespec pipe_mtime; /* time of last modify */ |
| | 97 | struct timespec pipe_ctime; /* time of status change */ |
| | 98 | struct sigio *pipe_sigio; /* information for async I/O */ |
| | 99 | struct pipe *pipe_peer; /* link with other direction */ |
| | 100 | u_int pipe_state; /* pipe status info */ |
| | 101 | int pipe_busy; /* busy flag, mostly to handle rundown sanely */ |
| | 102 | }; |
| | 103 | |
| | 104 | #endif /* _KERNEL || _KERNEL_STRUCTURES */ |
| | 105 | #endif /* !_SYS_PIPE_H_ */ |
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