From ff7b628213dd5356ce8a2ae34e7b8537c107d162 Mon Sep 17 00:00:00 2001
From: Jason McIntyre <jmc@cvs.openbsd.org>
Date: Fri, 20 Jun 2003 20:55:17 +0000
Subject: correct what FIONBIO returns; closes PR 2696;

work done by Otto Moerbeek.

also sorted the .Rs/.Re section.
---
 share/man/man4/bpf.4 | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

(limited to 'share/man/man4/bpf.4')

diff --git a/share/man/man4/bpf.4 b/share/man/man4/bpf.4
index 5c215827af5..2aa846163cc 100644
--- a/share/man/man4/bpf.4
+++ b/share/man/man4/bpf.4
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: bpf.4,v 1.15 2003/06/06 10:29:41 jmc Exp $
+.\"	$OpenBSD: bpf.4,v 1.16 2003/06/20 20:55:16 jmc Exp $
 .\"     $NetBSD: bpf.4,v 1.7 1995/09/27 18:31:50 thorpej Exp $
 .\"
 .\" Copyright (c) 1990 The Regents of the University of California.
@@ -292,12 +292,15 @@ Returns the number of bytes that are immediately available for reading.
 Returns the address associated with the interface.
 .It Dv FIONBIO Pf ( Li int Ns No )
 Set or clear non-blocking I/O.
-If the argument is non-zero, then doing a read when no data is available will
-return \-1 and
-.Va errno
-will be set to
-.Er EWOULDBLOCK .
+If the argument is non-zero, then doing a read while no data is available will
+return 0.
 If the argument is zero, non-blocking I/O is disabled.
+The non-blocking read behavior is different from performing non-blocking
+reads on other file descriptors, which will return \-1 and set
+.Va errno
+to
+.Er EAGAIN
+if no data is available.
 Note: setting this overrides the timeout set by
 .Dv BIOCSRTIMEOUT .
 .It Dv FIOASYNC Pf ( Li int Ns No )
@@ -884,7 +887,8 @@ struct bpf_insn insns[] = {
 .Xr signal 3 ,
 .Xr tcpdump 8
 .Rs
-.%A McCanne, S., Jacobson V.
+.%A McCanne, S.
+.%A Jacobson V.
 .%J "An efficient, extensible, and portable network monitor"
 .Re
 .Sh HISTORY
-- 
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