read_trace_pipe_iter
ASSERT_OK(read_trace_pipe_iter(trace_pipe_cb, &found, 1000),
ASSERT_OK(read_trace_pipe_iter(trace_pipe_cb, &found, 1000),
read_trace_pipe_iter(trace_pipe_cb, NULL, 0);
int read_trace_pipe_iter(void (*cb)(const char *str, void *data),