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ACCF_DATA(9)	       FreeBSD Kernel Developer's Manual	  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.

FreeBSD	13.0		       November	15, 2000		  FreeBSD 13.0
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY | AUTHORS

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<https://man.freebsd.org/cgi/man.cgi?query=accf_data&manpath=FreeBSD+13.2-RELEASE+and+Ports>

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