 @@ -1,148 +1,149 @@
-/* $NetBSD: pipe.h,v 1.32 2009/12/20 09:36:06 dsl Exp $ */
+/* $NetBSD: pipe.h,v 1.33 2016/01/22 23:38:45 dholland Exp $ */
 /*
  * Copyright (c) 1996 John S. Dyson
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice immediately at the beginning of the file, without modification,
  *    this list of conditions, and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Absolutely no warranty of function or purpose is made by the author
  *    John S. Dyson.
  * 4. This work was done expressly for inclusion into FreeBSD.  Other use
  *    is allowed if this notation is included.
  * 5. Modifications may be freely made to this file if the above conditions
  *    are met.
+ *
  * $FreeBSD: src/sys/sys/pipe.h,v 1.18 2002/02/27 07:35:59 alfred Exp $
  */
 #ifndef _SYS_PIPE_H_
 #define _SYS_PIPE_H_
 #include <sys/selinfo.h>		/* for struct selinfo */
 #include <sys/time.h>			/* for struct timespec */
 #include <uvm/uvm_extern.h>
 /*
  * Pipe buffer size, keep moderate in value, pipes take kva space.
  */
 #ifndef PIPE_SIZE
 #define PIPE_SIZE	16384
 #endif
 #ifndef BIG_PIPE_SIZE
 #define BIG_PIPE_SIZE	(4*PIPE_SIZE)
 #endif
 /*
  * Maximum size of kva for direct write transfer. If the amount
  * of data in buffer is larger, it would be transferred in chunks of this
  * size. This kva memory is freed after use if amount of pipe kva memory
  * is bigger than limitpipekva.
  */
 #ifndef PIPE_DIRECT_CHUNK
 #define PIPE_DIRECT_CHUNK	(1*1024*1024)
 #endif
 /*
  * PIPE_MINDIRECT MUST be smaller than PIPE_SIZE and MUST be bigger
  * than PIPE_BUF.
  */
 #ifndef PIPE_MINDIRECT
 #define PIPE_MINDIRECT	8192
 #endif
 /*
  * Pipe buffer information.
  * Separate in, out, cnt are used to simplify calculations.
  * Buffered write is active when the buffer.cnt field is set.
  */
 struct pipebuf {
 	size_t	cnt;		/* number of chars currently in buffer */
 	u_int	in;		/* in pointer */
 	u_int	out;		/* out pointer */
 	size_t	size;		/* size of buffer */
 	void *	buffer;		/* kva of buffer */
 };
 /*
  * Information to support direct transfers between processes for pipes.
  */
 struct pipemapping {
 	vaddr_t		kva;		/* kernel virtual address */
 	vsize_t		cnt;		/* number of chars in buffer */
 	voff_t		pos;		/* current position within page */
 	int		npages;		/* how many pages allocated */
 	struct vm_page	**pgs;		/* pointers to the pages */
 	u_int		egen;		/* emap generation number */
 };
 /*
  * Bits in pipe_state.
  */
 #define PIPE_ASYNC	0x001	/* Async I/O */
 #define PIPE_EOF	0x010	/* Pipe is in EOF condition */
 #define PIPE_SIGNALR	0x020	/* Do selwakeup() on read(2) */
 #define PIPE_DIRECTW	0x040	/* Pipe in direct write mode setup */
 #define PIPE_DIRECTR	0x080	/* Pipe direct read request (setup complete) */
 #define	PIPE_LOCKFL	0x100	/* Process has exclusive access to
 				   pointers/data. */
 #define	PIPE_LWANT	0x200	/* Process wants exclusive access to
 				   pointers/data. */
 #define	PIPE_RESTART	0x400	/* Return ERESTART to blocked syscalls */
 /*
  * Per-pipe data structure.
  * Two of these are linked together to produce bi-directional pipes.
  */
 struct pipe {
 	kmutex_t *pipe_lock;		/* pipe mutex */
 	kcondvar_t pipe_rcv;		/* cv for readers */
 	kcondvar_t pipe_wcv;		/* cv for writers */
 	kcondvar_t pipe_draincv;	/* cv for close */
 	kcondvar_t pipe_lkcv;		/* locking */
 	struct	pipebuf pipe_buffer;	/* data storage */
 	struct	pipemapping pipe_map;	/* pipe mapping for direct I/O */
 	struct	selinfo pipe_sel;	/* for compat with select */
 	struct	timespec pipe_atime;	/* time of last access */
 	struct	timespec pipe_mtime;	/* time of last modify */
 	struct	timespec pipe_btime;	/* time of creation */
 	pid_t	pipe_pgid;		/* process group for sigio */
 	struct	pipe *pipe_peer;	/* link with other direction */
 	u_int	pipe_state;		/* pipe status info */
 	int	pipe_busy;		/* busy flag, to handle rundown */
 	vaddr_t	pipe_kmem;		/* preallocated PIPE_SIZE buffer */
 };
 /*
  * KERN_PIPE subtypes
  */
 #define	KERN_PIPE_MAXKVASZ		1	/* maximum kva size */
 #define	KERN_PIPE_LIMITKVA		2	/* */
 #define	KERN_PIPE_MAXBIGPIPES		3	/* maximum # of "big" pipes */
 #define	KERN_PIPE_NBIGPIPES		4	/* current number of "big" p. */
 #define	KERN_PIPE_KVASIZE		5	/* current pipe kva size */
 #define	KERN_PIPE_MAXID			6
 #define	CTL_PIPE_NAMES { \
 	{ 0, 0 }, \
 	{ "maxkvasz", CTLTYPE_INT }, \
 	{ "maxloankvasz", CTLTYPE_INT }, \
 	{ "maxbigpipes", CTLTYPE_INT }, \
 	{ "nbigpipes", CTLTYPE_INT }, \
 	{ "kvasize", CTLTYPE_INT }, \
+}
 #ifdef _KERNEL
 int	sysctl_dopipe(int *, u_int, void *, size_t *, void *, size_t);
 void	pipe_init(void);
 #endif /* _KERNEL */
 #endif /* !_SYS_PIPE_H_ */