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 de

scriptor 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 com

piled 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_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 Perl

stein.

BSD November 15, 2000

BSD