ACCF_DATA(9)

NAME
accf_data - buffer incoming connections until data arrives

SYNOPSIS
options INET
options ACCEPT_FILTER_DATA
kldload 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.

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 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_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.