Function SysLoggerMain

src/backend/postmaster/syslogger.c:177–598

* Main entry point for syslogger process * argc/argv parameters are valid only in EXEC_BACKEND case. */

 * argc/argv parameters are valid only in EXEC_BACKEND case.
 */
NON_EXEC_STATIC void
SysLoggerMain(int argc, char *argv[])
{
#ifndef WIN32
	char		logbuffer[READ_BUF_SIZE];
	int			bytes_in_logbuffer = 0;
#endif
	char	   *currentLogDir;
	char	   *currentLogFilename;
	int			currentLogRotationAge;
	pg_time_t	now;
	WaitEventSet *wes;

	now = MyStartTime;

#ifdef EXEC_BACKEND
	syslogger_parseArgs(argc, argv);
#endif							/* EXEC_BACKEND */

	MyBackendType = B_LOGGER;
	if (Gp_role == GP_ROLE_DISPATCH)
		init_ps_display("master logger process");
	else
		init_ps_display("logger process");

	/*
	 * If we restarted, our stderr is already redirected into our own input
	 * pipe.  This is of course pretty useless, not to mention that it
	 * interferes with detecting pipe EOF.  Point stderr to /dev/null. This
	 * assumes that all interesting messages generated in the syslogger will
	 * come through elog.c and will be sent to write_syslogger_file.
	 */
	{
		int			fd = open(DEVNULL, O_WRONLY, 0);

		/*
		 * The closes might look redundant, but they are not: we want to be
		 * darn sure the pipe gets closed even if the open failed.  We can
		 * survive running with stderr pointing nowhere, but we can't afford
		 * to have extra pipe input descriptors hanging around.
		 *
		 * As we're just trying to reset these to go to DEVNULL, there's not
		 * much point in checking for failure from the close/dup2 calls here,
		 * if they fail then presumably the file descriptors are closed and
		 * any writes will go into the bitbucket anyway.
		 */
		close(fileno(stdout));
		close(fileno(stderr));
		if (fd != -1)
		{
			(void) dup2(fd, fileno(stdout));
			(void) dup2(fd, fileno(stderr));
			close(fd);
		}
	}

	/*
	 * Syslogger's own stderr can't be the syslogPipe, so set it back to text