Bring several fixes from FreeBSD to our current pipe implementation:

- when allocating or growing a pipe buffer is not possible, do not panic
  but report the error and handle it correctly. (1.73)
- "The pipe_write() code was locking the pipe without busying it first
  in certain cases, and a close() by another process could potentially rip
  the pipe out from under the (blocked) locking operation." (from Al Viro,
  1.81)
- "Remove test in pipe_write() which causes write(2) to return EAGAIN
  on a non-blocking pipe in cases where select(2) returns the file
  descriptor as ready for write. This in turns causes libc_r, for
  one, to busy wait in such cases.
  Note: it is a quick performance fix, a more complex fix might be
  required in case this turns out to have unexpected side effects."
  (1.141)

1 files changed, 1 insertions, 2 deletions

diff --git a/sys/sys/pipe.h b/sys/sys/pipe.h
index 0738720b9a0..4ed94c7333d 100644
--- a/sys/sys/pipe.h
+++ b/sys/sys/pipe.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pipe.h,v 1.10 2002/03/14 01:27:14 millert Exp $	*/
+/*	$OpenBSD: pipe.h,v 1.11 2003/10/03 16:38:03 miod Exp $	*/
 
 /*
  * Copyright (c) 1996 John S. Dyson
@@ -53,7 +53,6 @@ struct pipebuf {
 	u_int	out;		/* out pointer */
 	u_int	size;		/* size of buffer */
 	caddr_t	buffer;		/* kva of buffer */
-	struct	vm_object *object;	/* VM object containing buffer */
 };
 
 /*