svn commit: r248774 - head/lib/libc/sys

[Jilles Tjoelker]

Author: jilles
Date: Tue Mar 26 22:46:56 2013
New Revision: 248774
URL: http://svnweb.freebsd.org/changeset/base/248774

Log:
  accept(2): Mention inheritance of O_ASYNC and signal destination.
  
  While almost nobody uses O_ASYNC, and rightly so, the inheritance of the
  related properties across accept() is a portability issue like the
  inheritance of O_NONBLOCK.

Modified:
  head/lib/libc/sys/accept.2

Modified: head/lib/libc/sys/accept.2
==============================================================================
--- head/lib/libc/sys/accept.2	Tue Mar 26 22:17:10 2013	(r248773)
+++ head/lib/libc/sys/accept.2	Tue Mar 26 22:46:56 2013	(r248774)
@@ -28,7 +28,7 @@
 .\"     @(#)accept.2	8.2 (Berkeley) 12/11/93
 .\" $FreeBSD$
 .\"
-.Dd December 11, 1993
+.Dd March 26, 2013
 .Dt ACCEPT 2
 .Os
 .Sh NAME
@@ -57,7 +57,13 @@ queue of pending connections, creates a 
 and allocates a new file descriptor for the socket which
 inherits the state of the
 .Dv O_NONBLOCK
-property from the original socket
+and
+.Dv O_ASYNC
+properties and the destination of
+.Dv SIGIO
+and
+.Dv SIGURG
+signals from the original socket
 .Fa s .
 .Pp
 If no pending connections are
@@ -129,7 +135,11 @@ to pre-process incoming connections.
 .Pp
 Portable programs should not rely on the
 .Dv O_NONBLOCK
-property being inherited.
+and
+.Dv O_ASYNC
+properties and the signal destination being inherited,
+but should set them explicitly using
+.Xr fcntl 2 .
 .Sh RETURN VALUES
 The call returns \-1 on error.
 If it succeeds, it returns a non-negative