NAME¶
accf_data —
buffer incoming connections
until data arrives
SYNOPSIS¶
options ACCEPT_FILTER_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.