sf_ext_rsvd Reserved for future use; you must initialize the reserved fields with zeroes. See AlsoFieldssf_handlesf_flagssf_namesf_unregisteredsf_attachsf_detachsf_notifysf_data_insf_data_outsf_connect_insf_connect_outsf_bindsf_setoptionsf_getoptionsf_listensf_ioctlsf_lensf_ext_accept