Function grpcio_sys::grpcwrap_call_start_unary

pub unsafe extern "C" fn grpcwrap_call_start_unary(
    call: *mut grpc_call, 
    ctx: *mut grpcwrap_batch_context, 
    send_buffer: *const c_char, 
    send_buffer_len: usize, 
    write_flags: u32, 
    initial_metadata: *mut grpc_metadata_array, 
    initial_metadata_flags: u32, 
    tag: *mut c_void
) -> grpc_call_error