/ kernel routines / Accf_data - Buffer Incoming Connections Until Data Arrives


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 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 , accept_filter , accf_dns , accf_http
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.
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accept_filter , accept_filt_add , accept_filt_del , accept_filt_generic_mod_event , accept_filt_get - filter incoming connections
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