6c8f7fc3ba
. add all sys/sys headers not already present to help compiling . take netbsd dirent.h and struct dirent; main result is introducing d_type and d_namlen that have to be set by getdents() in all FS code implementing it . d_off is gone . alignment of the struct has become 8 bytes instead of 4 . remove _MAX_BLOCK_SIZE, _MIN_BLOCK_SIZE, _STATIC_BLOCK_SIZE . libminlib: cleanup unused yet duplicate code . mfs: throw out the long-broken v1, v2 support . new test for dirent contents filled by getdents() Change-Id: I1459755c7ba5e5d1c9396d3a587ce6e63ddc283e
149 lines
4.7 KiB
C
149 lines
4.7 KiB
C
/* $NetBSD: pipe.h,v 1.32 2009/12/20 09:36:06 dsl Exp $ */
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/*
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* Copyright (c) 1996 John S. Dyson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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* 4. This work was done expressly for inclusion into FreeBSD. Other use
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* is allowed if this notation is included.
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* 5. Modifications may be freely made to this file if the above conditions
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* are met.
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*
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* $FreeBSD: src/sys/sys/pipe.h,v 1.18 2002/02/27 07:35:59 alfred Exp $
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*/
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#ifndef _SYS_PIPE_H_
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#define _SYS_PIPE_H_
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#include <sys/selinfo.h> /* for struct selinfo */
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#include <uvm/uvm_extern.h>
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/*
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* Pipe buffer size, keep moderate in value, pipes take kva space.
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*/
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#ifndef PIPE_SIZE
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#define PIPE_SIZE 16384
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#endif
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#ifndef BIG_PIPE_SIZE
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#define BIG_PIPE_SIZE (4*PIPE_SIZE)
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#endif
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/*
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* Maximum size of kva for direct write transfer. If the amount
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* of data in buffer is larger, it would be transferred in chunks of this
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* size. This kva memory is freed after use if amount of pipe kva memory
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* is bigger than limitpipekva.
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*/
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#ifndef PIPE_DIRECT_CHUNK
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#define PIPE_DIRECT_CHUNK (1*1024*1024)
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#endif
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/*
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* PIPE_MINDIRECT MUST be smaller than PIPE_SIZE and MUST be bigger
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* than PIPE_BUF.
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*/
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#ifndef PIPE_MINDIRECT
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#define PIPE_MINDIRECT 8192
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#endif
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/*
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* Pipe buffer information.
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* Separate in, out, cnt are used to simplify calculations.
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* Buffered write is active when the buffer.cnt field is set.
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*/
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struct pipebuf {
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size_t cnt; /* number of chars currently in buffer */
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u_int in; /* in pointer */
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u_int out; /* out pointer */
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size_t size; /* size of buffer */
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void * buffer; /* kva of buffer */
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};
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/*
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* Information to support direct transfers between processes for pipes.
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*/
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struct pipemapping {
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vaddr_t kva; /* kernel virtual address */
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vsize_t cnt; /* number of chars in buffer */
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voff_t pos; /* current position within page */
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int npages; /* how many pages allocated */
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struct vm_page **pgs; /* pointers to the pages */
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u_int egen; /* emap generation number */
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};
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/*
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* Bits in pipe_state.
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*/
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#define PIPE_ASYNC 0x001 /* Async I/O */
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#define PIPE_EOF 0x010 /* Pipe is in EOF condition */
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#define PIPE_SIGNALR 0x020 /* Do selwakeup() on read(2) */
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#define PIPE_DIRECTW 0x040 /* Pipe in direct write mode setup */
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#define PIPE_DIRECTR 0x080 /* Pipe direct read request (setup complete) */
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#define PIPE_LOCKFL 0x100 /* Process has exclusive access to
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pointers/data. */
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#define PIPE_LWANT 0x200 /* Process wants exclusive access to
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pointers/data. */
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#define PIPE_RESTART 0x400 /* Return ERESTART to blocked syscalls */
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/*
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* Per-pipe data structure.
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* Two of these are linked together to produce bi-directional pipes.
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*/
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struct pipe {
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kmutex_t *pipe_lock; /* pipe mutex */
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kcondvar_t pipe_rcv; /* cv for readers */
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kcondvar_t pipe_wcv; /* cv for writers */
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kcondvar_t pipe_draincv; /* cv for close */
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kcondvar_t pipe_lkcv; /* locking */
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struct pipebuf pipe_buffer; /* data storage */
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struct pipemapping pipe_map; /* pipe mapping for direct I/O */
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struct selinfo pipe_sel; /* for compat with select */
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struct timespec pipe_atime; /* time of last access */
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struct timespec pipe_mtime; /* time of last modify */
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struct timespec pipe_btime; /* time of creation */
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pid_t pipe_pgid; /* process group for sigio */
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struct pipe *pipe_peer; /* link with other direction */
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u_int pipe_state; /* pipe status info */
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int pipe_busy; /* busy flag, to handle rundown */
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vaddr_t pipe_kmem; /* preallocated PIPE_SIZE buffer */
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};
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/*
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* KERN_PIPE subtypes
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*/
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#define KERN_PIPE_MAXKVASZ 1 /* maximum kva size */
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#define KERN_PIPE_LIMITKVA 2 /* */
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#define KERN_PIPE_MAXBIGPIPES 3 /* maximum # of "big" pipes */
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#define KERN_PIPE_NBIGPIPES 4 /* current number of "big" p. */
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#define KERN_PIPE_KVASIZE 5 /* current pipe kva size */
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#define KERN_PIPE_MAXID 6
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#define CTL_PIPE_NAMES { \
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{ 0, 0 }, \
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{ "maxkvasz", CTLTYPE_INT }, \
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{ "maxloankvasz", CTLTYPE_INT }, \
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{ "maxbigpipes", CTLTYPE_INT }, \
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{ "nbigpipes", CTLTYPE_INT }, \
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{ "kvasize", CTLTYPE_INT }, \
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}
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#ifdef _KERNEL
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int sysctl_dopipe(int *, u_int, void *, size_t *, void *, size_t);
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void pipe_init(void);
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#endif /* _KERNEL */
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#endif /* !_SYS_PIPE_H_ */
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