src/backend/utils/resgroup/resgroup-ops-linux.c：
static char *
buildPath(Oid group,
		  BaseType base,
		  ResGroupCompType comp,
		  const char *prop,
		  char *path,
		  size_t pathsize)
{
	char	   *result = buildPathSafe(group, base, comp, prop, path, pathsize);
  ……
	return result;
}