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-.\"
-.\" This file and its contents are supplied under the terms of the
-.\" Common Development and Distribution License ("CDDL"), version 1.0.
-.\" You may only use this file in accordance with the terms of version
-.\" 1.0 of the CDDL.
-.\"
-.\" A full copy of the text of the CDDL should have accompanied this
-.\" source.  A copy of the CDDL is also available via the Internet at
-.\" http://www.illumos.org/license/CDDL.
-.\"
-.\"
-.\" Copyright 2014 Ryan Zezeski
-.\" Copyright 2015 Joyent, Inc.
-.\"
-.Dd Apr 21, 2015
-.Dt DATAFILT 7M
-.Os
-.Sh NAME
-.Nm datafilt
-.Nd socket filter module for deferred TCP connections
-.Sh DESCRIPTION
-The
-.Nm datafilt
-socket filter provides deferment of
-.Xr accept 3SOCKET
-for TCP connections.
-The accept call will not return until at least one byte has been
-buffered by the kernel.
-Deferment assures the application that the first call to
-.Xr read 2
-or
-.Xr recv 3SOCKET
-will not block.
-It reduces unnecessary switching between user and kernel.
-.Sh EXAMPLES
-.Ss Example 1
-Enable deferment on the listening socket.
-.Bd -literal
-    setsockopt(lsock, SOL_FILTER, FIL_ATTACH, "datafilt", 8);
-.Ed
-.Ss Example 2
-Disable deferment on the listening socket.
-.Bd -literal
-    char filt[] = "datafilt";
-    setsockopt(lsock, SOL_FILTER, FIL_DETACH, filt, strlen(filt) + 1);
-.Ed
-.Sh SEE ALSO
-.Xr setsockopt 3SOCKET