Function grpcio_sys::grpcwrap_call_start_duplex_streaming

pub unsafe extern "C" fn grpcwrap_call_start_duplex_streaming(
    call: *mut GrpcCall, 
    ctx: *mut GrpcBatchContext, 
    initial_metadata: *mut GrpcMetadataArray, 
    initial_metadata_flags: uint32_t, 
    tag: *mut c_void
) -> GrpcCallStatus