---
freebsd/sys/sys/pipe.h | 142 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 142 insertions(+)
create mode 100644 freebsd/sys/sys/pipe.h
diff --git a/freebsd/sys/sys/pipe.h b/freebsd/sys/sys/pipe.h
new file mode 100644
index 0000000..20b1092
--- /dev/null
+++ b/freebsd/sys/sys/pipe.h
@@ -0,0 +1,142 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_PIPE_H_
+#define _SYS_PIPE_H_
+
+#ifndef _KERNEL
+#error "no user-servicable parts inside"
+#endif
+
+/*
+ * 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
+
+#ifndef SMALL_PIPE_SIZE
+#define SMALL_PIPE_SIZE PAGE_SIZE
+#endif
+
+/*
+ * PIPE_MINDIRECT MUST be smaller than PIPE_SIZE and MUST be bigger
+ * than PIPE_BUF.
+ */
+#ifndef PIPE_MINDIRECT
+#define PIPE_MINDIRECT 8192
+#endif
+
+#define PIPENPAGES (BIG_PIPE_SIZE / PAGE_SIZE + 1)
+
+/*
+ * See sys_pipe.c for info on what these limits mean.
+ */
+extern long maxpipekva;
+
+/*
+ * 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 */
+};
+
+/*
+ * Information to support direct transfers between processes for pipes.
+ */
+struct pipemapping {
+ vm_size_t cnt; /* number of chars in buffer */
+ vm_size_t pos; /* current position of transfer */
+ int npages; /* number of pages */
+ vm_page_t ms[PIPENPAGES]; /* pages in source process */
+};
+
+/*
+ * 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_WANT 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_LOCKFL 0x100 /* Process has exclusive access to
pointers/data. */
+#define PIPE_LWANT 0x200 /* Process wants exclusive access to
pointers/data. */
+#define PIPE_DIRECTW 0x400 /* Pipe direct write active. */
+#define PIPE_DIRECTOK 0x800 /* Direct mode ok. */
+
+/*
+ * Per-pipe data structure.
+ * Two of these are linked together to produce bi-directional pipes.
+ */
+struct pipe {
+ 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_ctime; /* time of status change */
+ struct sigio *pipe_sigio; /* information for async I/O */
+ struct pipe *pipe_peer; /* link with other direction */
+ struct pipepair *pipe_pair; /* container structure pointer */
+ u_int pipe_state; /* pipe status info */
+ int pipe_busy; /* busy flag, mostly to handle rundown
sanely */
+ int pipe_present; /* still present? */
+ ino_t pipe_ino; /* fake inode for stat(2) */
+};
+
+/*
+ * Values for the pipe_present.
+ */
+#define PIPE_ACTIVE 1
+#define PIPE_CLOSING 2
+#define PIPE_FINALIZED 3
+
+/*
+ * Container structure to hold the two pipe endpoints, mutex, and label
+ * pointer.
+ */
+struct pipepair {
+ struct pipe pp_rpipe;
+ struct pipe pp_wpipe;
+ struct mtx pp_mtx;
+ struct label *pp_label;
+};
+
+#define PIPE_MTX(pipe) (&(pipe)->pipe_pair->pp_mtx)
+#define PIPE_LOCK(pipe) mtx_lock(PIPE_MTX(pipe))
+#define PIPE_UNLOCK(pipe) mtx_unlock(PIPE_MTX(pipe))
+#define PIPE_LOCK_ASSERT(pipe, type) mtx_assert(PIPE_MTX(pipe), (type))
+
+
+#endif /* !_SYS_PIPE_H_ */
--
1.9.1
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