ACCF_DATA(9) | 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.

August 10, 2008 | NetBSD 11.0