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 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
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.