From e2abcdca396661cbe0ae2ddb13d5c2b85682c13a Mon Sep 17 00:00:00 2001
From: Cem Keylan <cem@ckyln.com>
Date: Fri, 16 Oct 2020 17:41:25 +0300
Subject: initial commit

---
 sys/sys/pipe.h | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 sys/sys/pipe.h

(limited to 'sys/sys/pipe.h')

diff --git a/sys/sys/pipe.h b/sys/sys/pipe.h
new file mode 100644
index 0000000..d23f266
--- /dev/null
+++ b/sys/sys/pipe.h
@@ -0,0 +1,96 @@
+/*	$OpenBSD: pipe.h,v 1.24 2020/01/24 11:07:41 anton 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.
+ */
+
+#ifndef _SYS_PIPE_H_
+#define _SYS_PIPE_H_
+
+#ifndef _KERNEL
+#include <sys/time.h>			/* for struct timespec */
+#include <sys/selinfo.h>		/* for struct selinfo */
+#endif /* _KERNEL */
+
+#include <sys/sigio.h>			/* for struct sigio_ref */
+
+/*
+ * 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	(64*1024)
+#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 {
+	u_int	cnt;		/* number of chars currently in buffer */
+	u_int	in;		/* in pointer */
+	u_int	out;		/* out pointer */
+	u_int	size;		/* size of buffer */
+	caddr_t	buffer;		/* kva of buffer */
+};
+
+/*
+ * Bits in pipe_state.
+ */
+#define PIPE_ASYNC	0x004	/* Async? I/O. */
+#define PIPE_WANTR	0x008	/* Reader wants some characters. */
+#define PIPE_WANTW	0x010	/* Writer wants space to put characters. */
+#define PIPE_WANTD	0x020	/* Pipe is wanted to be run-down. */
+#define PIPE_SEL	0x040	/* Pipe has a select active. */
+#define PIPE_EOF	0x080	/* Pipe is in EOF condition. */
+#define PIPE_LOCK	0x100	/* Thread has exclusive I/O access. */
+#define PIPE_LWANT	0x200	/* Thread wants exclusive I/O access. */
+
+/*
+ * Per-pipe data structure.
+ * Two of these are linked together to produce bi-directional pipes.
+ *
+ * Locking:
+ *	I	immutable after creation
+ *	S	sigio_lock
+ *	p	pipe_lock
+ */
+struct pipe {
+	struct	rwlock *pipe_lock;
+	struct	pipebuf pipe_buffer;	/* [p] data storage */
+	struct	selinfo pipe_sel;	/* [p] for compat with select */
+	struct	timespec pipe_atime;	/* [p] time of last access */
+	struct	timespec pipe_mtime;	/* [p] time of last modify */
+	struct	timespec pipe_ctime;	/* [I] time of status change */
+	struct	sigio_ref pipe_sigio;	/* [S] async I/O registration */
+	struct	pipe *pipe_peer;	/* [p] link with other direction */
+	u_int	pipe_state;		/* [p] pipe status info */
+	int	pipe_busy;		/* [p] # readers/writers */
+};
+
+#ifdef _KERNEL
+void	pipe_init(void);
+#endif /* _KERNEL */
+
+#endif /* !_SYS_PIPE_H_ */
-- 
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