ftdm_io_interface 224 src/include/ftdm_declare.h typedef struct ftdm_io_interface ftdm_io_interface_t; ftdm_io_interface 450 src/include/private/ftdm_core.h struct ftdm_io_interface *fio; ftdm_io_interface 476 src/include/private/ftdm_core.h struct ftdm_io_interface *fio;