ACCF_DATA(9FREEBSD) - man page online | system kernel interfaces

ACCF_DATA(9)                      BSD 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.

BSD                                     November 15, 2000                                     BSD