bpf_raw_tracepoint_open
err = bpf_raw_tracepoint_open(&attr);
return bpf_raw_tracepoint_open(NULL, prog_fd);
LIBBPF_API int bpf_raw_tracepoint_open(const char *name, int prog_fd);
tp_fd = bpf_raw_tracepoint_open("nbd_send_request", bpf_fd);
int tp_fd = bpf_raw_tracepoint_open("bpf_test_finish", bpf_fd);
efd = bpf_raw_tracepoint_open("sys_enter", prog_fd);