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 13.1-RELEASE-p6        November 15, 2000       FreeBSD 13.1-RELEASE-p6