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ACCF_DATA(9)		 BSD Kernel Developer's Manual		  ACCF_DATA(9)

NAME
     accf_data — buffer incoming connections until data arrives

SYNOPSIS
     options INET
     pseudo-device accf_data

DESCRIPTION
     This is a filter to be placed on a socket that will be using accept() to
     receive incoming connections.

     It prevents the application from receiving the connected descriptor via
     accept() until data arrives on the connection.

EXAMPLES
     If the accf_data accept filter is present in the kernel configuration,
     this will enable the data accept filter on the socket sok.

	     struct accept_filter_arg afa;

	     bzero(&afa, sizeof(afa));
	     strcpy(afa.af_name, "dataready");
	     setsockopt(sok, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));

SEE ALSO
     setsockopt(2), accept_filter(9), accf_http(9)

HISTORY
     The accept filter mechanism and the accf_data filter were introduced in
     FreeBSD 4.0.  They were ported to NetBSD by Coyote Point Systems and
     appeared in NetBSD 5.0.

AUTHORS
     This manual page and the filter were written by Alfred Perlstein.

BSD				August 10, 2008				   BSD

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