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

NAME
     accf_data -- buffer incoming connections until data arrives

SYNOPSIS
     options INET
     options ACCEPT_FILTER_DATA

     In rc.conf(5):
     kld_list="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 ac-
     cept() until data arrives on the connection.

     The ACCEPT_FILTER_DATA kernel option is also a module that can  be  enabled
     at  runtime  via  kldload(8)  if the INET option has been compiled into the
     kernel.

EXAMPLES
     Assuming ACCEPT_FILTER_DATA has been included in the kernel config file  or
     the accf_data module has been loaded, this will enable the data accept fil-
     ter 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_dns(9), accf_http(9)

HISTORY
     The  accept  filter  mechanism  and the accf_data filter were introduced in
     FreeBSD 4.0.

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

FreeBSD ports 15.quarterly	November 15, 2000		    ACCF_DATA(9)

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<https://man.freebsd.org/cgi/man.cgi?query=accf_data&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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