Function write_csvlog

src/backend/utils/error/elog.c:3393–3613

* Constructs the error message, depending on the Errordata it gets, in a CSV * format which is described in doc/src/sgml/config.sgml. */

 * format which is described in doc/src/sgml/config.sgml.
 */
static void
write_csvlog(ErrorData *edata)
{
	StringInfoData buf;
	bool		print_stmt = false;

	/* static counter for line numbers */
	static long log_line_number = 0;

	/* has counter been reset in current process? */
	static int	log_my_pid = 0;

	/*
	 * This is one of the few places where we'd rather not inherit a static
	 * variable's value from the postmaster.  But since we will, reset it when
	 * MyProcPid changes.
	 */
	if (log_my_pid != MyProcPid)
	{
		log_line_number = 0;
		log_my_pid = MyProcPid;
		formatted_start_time[0] = '\0';
	}
	log_line_number++;

	initStringInfo(&buf);

	/*
	 * timestamp with milliseconds
	 *
	 * Check if the timestamp is already calculated for the syslog message,
	 * and use it if so.  Otherwise, get the current timestamp.  This is done
	 * to put same timestamp in both syslog and csvlog messages.
	 */
	if (formatted_log_time[0] == '\0')
		setup_formatted_log_time();

	appendStringInfoString(&buf, formatted_log_time);
	appendStringInfoChar(&buf, ',');

	/* username */
	if (MyProcPort)
		appendCSVLiteral(&buf, MyProcPort->user_name);
	appendStringInfoChar(&buf, ',');

	/* database name */
	if (MyProcPort)
		appendCSVLiteral(&buf, MyProcPort->database_name);
	appendStringInfoChar(&buf, ',');

	/* Process id  */
	if (MyProcPid != 0)
		appendStringInfo(&buf, "%d", MyProcPid);
	appendStringInfoChar(&buf, ',');

	/* Remote host and port */
	if (MyProcPort && MyProcPort->remote_host)
	{