Function AuxiliaryProcessMain

src/backend/bootstrap/bootstrap.c:202–512

* AuxiliaryProcessMain * * The main entry point for auxiliary processes, such as the bgwriter, * walwriter, walreceiver, bootstrapper and the shared memory checker code. * * This code is here just because of historical reasons. */

 *	 This code is here just because of historical reasons.
 */
void
AuxiliaryProcessMain(int argc, char *argv[])
{
	char	   *progname = argv[0];
	int			flag;
	char	   *userDoption = NULL;

	/*
	 * Initialize process environment (already done if under postmaster, but
	 * not if standalone).
	 */
	if (!IsUnderPostmaster)
		InitStandaloneProcess(argv[0]);

	/*
	 * process command arguments
	 */

	/* Set defaults, to be overridden by explicit options below */
	if (!IsUnderPostmaster)
		InitializeGUCOptions();

	/* Ignore the initial --boot argument, if present */
	if (argc > 1 && strcmp(argv[1], "--boot") == 0)
	{
		argv++;
		argc--;
	}

	/* If no -x argument, we are a CheckerProcess */
	MyAuxProcType = CheckerProcess;

 	while ((flag = getopt(argc, argv, "B:c:d:D:FkK:r:x:R:u:X:-:")) != -1)
	{
		switch (flag)
		{
			case 'B':
				SetConfigOption("shared_buffers", optarg, PGC_POSTMASTER, PGC_S_ARGV);
				break;
			case 'D':
				userDoption = pstrdup(optarg);
				break;
			case 'd':
				{
					/* Turn on debugging for the bootstrap process. */
					char	   *debugstr;

					debugstr = psprintf("debug%s", optarg);
					SetConfigOption("log_min_messages", debugstr,
									PGC_POSTMASTER, PGC_S_ARGV);
					SetConfigOption("client_min_messages", debugstr,
									PGC_POSTMASTER, PGC_S_ARGV);
					pfree(debugstr);
				}
				break;
			case 'F':
				SetConfigOption("fsync", "false", PGC_POSTMASTER, PGC_S_ARGV);
				break;