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ACCF_DATA(9FREEBSD) - Linux manual page online | System kernel interfaces

Buffer incoming connections until data arrives.

November 15, 2000
ACCF_DATA(9) BSD Kernel Developer's Manual ACCF_DATA(9)


accf_data — buffer incoming connections until data arrives


options INET options ACCEPT_FILTER_DATA kldload accf_data


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.


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));


setsockopt(2), accept_filter(9), accf_dns(9), accf_http(9)


The accept filter mechanism and the accf_data filter were introduced in FreeBSD 4.0.


This manual page and the filter were written by Alfred Perlstein.
BSD November 15, 2000 BSD
This manual Reference Other manuals
accf_data(9freebsd) referred by accept_filt_add(9freebsd) | accept_filt_del(9freebsd) | accept_filt_generic_mod_event(9freebsd) | accept_filt_get(9freebsd) | accept_filter(9freebsd) | accf_dns(9freebsd)
refer to accept_filter(9freebsd) | accf_dns(9freebsd) | accf_http(9freebsd) | getsockopt(2)
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