accf_data man page on FreeBSD

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ACCF_DATA(9)		 BSD Kernel Developer's Manual		  ACCF_DATA(9)

     accf_data — buffer incoming connections until data arrives

     options INET
     kldload accf_data

     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

     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));

     setsockopt(2), accept_filter(9), accf_dns(9) accf_http(9)

     The accept filter mechanism and the accf_data filter were introduced in
     FreeBSD 4.0.

     This manual page and the filter were written by Alfred Perlstein.

BSD			       November 15, 2000			   BSD

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