void st_set_trace_file_enabled(bool enable) { if (enable == !!trace_fp) { return; /* no change */ } /* Halt trace writeout */ flush_trace_file(true); trace_writeout_enabled = false; flush_trace_file(true); if (enable) { static const TraceRecord header = { .event = HEADER_EVENT_ID, .timestamp_ns = HEADER_MAGIC, .x1 = HEADER_VERSION, }; trace_fp = fopen(trace_file_name, "w"); if (!trace_fp) { return; } if (fwrite(&header, sizeof header, 1, trace_fp) != 1) { fclose(trace_fp); trace_fp = NULL; return; } /* Resume trace writeout */ trace_writeout_enabled = true; flush_trace_file(false); } else { fclose(trace_fp); trace_fp = NULL; } }