trace_pipe 130 tools/bpf/bpftool/tracelog.c char trace_pipe[PATH_MAX]; trace_pipe 136 tools/bpf/bpftool/tracelog.c if (!get_tracefs_pipe(trace_pipe)) trace_pipe 139 tools/bpf/bpftool/tracelog.c trace_pipe_fd = fopen(trace_pipe, "r");