accf_data(9) - NetBSD Manual Pages

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


NAME

     accf_data -- buffer incoming connections until data arrives


SYNOPSIS

     options INET
     pseudo-device 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.


EXAMPLES

     If the accf_data accept filter is present in the kernel configuration,
     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_http(9)


HISTORY

     The accept filter mechanism and the accf_data filter were introduced in
     FreeBSD 4.0.  They were ported to NetBSD by Coyote Point Systems and
     appeared in NetBSD 5.0.


AUTHORS

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

NetBSD 8.2                      August 10, 2008                     NetBSD 8.2