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 TraceLogHeader header = {
.header_event_id = HEADER_EVENT_ID,
.header_magic = HEADER_MAGIC,
/* Older log readers will check for version at next location */
.header_version = HEADER_VERSION,
};
trace_fp = fopen(trace_file_name, "wb");
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 {
void trace_record_finish(TraceBufferRecord *rec)
{
TraceRecord record;
read_from_buffer(rec->tbuf_idx, &record, sizeof(TraceRecord));
smp_wmb(); /* write barrier before marking as valid */
record.event |= TRACE_RECORD_VALID;
write_to_buffer(rec->tbuf_idx, &record, sizeof(TraceRecord));
if ((trace_idx - writeout_idx) > TRACE_BUF_FLUSH_THRESHOLD) {
flush_trace_file(false);
}
}