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 usingaccept()
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
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.