Function process_postgres_switches

src/backend/tcop/postgres.c:4666–4943

---------------------------------------------------------------- * process_postgres_switches * Parse command line arguments for PostgresMain * * This is called twice, once for the "secure" options coming from the * postmaster or command line, and once for the "insecure" options coming * from the client's startup packet. The latter have the same syntax but * may be restricted in what the

 * ----------------------------------------------------------------
 */
void
process_postgres_switches(int argc, char *argv[], GucContext ctx,
						  const char **dbname)
{
	bool		secure = (ctx == PGC_POSTMASTER);
	int			errs = 0;
	GucSource	gucsource;
	int			flag;

	if (secure)
	{
		gucsource = PGC_S_ARGV; /* switches came from command line */

		/* Ignore the initial --single argument, if present */
		if (argc > 1 && strcmp(argv[1], "--single") == 0)
		{
			argv++;
			argc--;
		}
	}
	else
	{
		gucsource = PGC_S_CLIENT;	/* switches came from client */
	}

#ifdef HAVE_INT_OPTERR

	/*
	 * Turn this off because it's either printed to stderr and not the log
	 * where we'd want it, or argv[0] is now "--single", which would make for
	 * a weird error message.  We print our own error message below.
	 */
	opterr = 0;
#endif

	/*
	 * Parse command-line options.  CAUTION: keep this in sync with
	 * postmaster/postmaster.c (the option sets should not conflict) and with
	 * the common help() function in main/main.c.
	 */
	while ((flag = getopt(argc, argv, "B:bc:C:D:d:EeFf:h:ijk:lMm:N:nOPp:r:R:S:sTt:v:W:-:")) != -1)
	{
		switch (flag)
		{
			case 'B':
				SetConfigOption("shared_buffers", optarg, ctx, gucsource);
				break;

			case 'b':
				/* Undocumented flag used for binary upgrades */
				if (secure)
					IsBinaryUpgrade = true;
				break;

			case 'C':
				/* ignored for consistency with the postmaster */
				break;