* autoload.cc (LsaLookupSids): Import.

* cygserver_pwdgrp.h: Include userinfo.h.  Drop workaround defining
	fetch_user_arg_type_t locally.
	* grp.cc (internal_getgrsid_cachedonly): New function.
	(internal_getgrfull): Ditto.
	(internal_getgroups): Rearrange function.  Center around fetching all
	cached group info first, calling LsaLookupSids on all so far non-cached
	groups second.  Pass all available info to new internal_getgrfull call.
	* pwdgrp.h: Include userinfo.h.  Move definitions of
	fetch_user_arg_type_t and fetch_user_arg_t there.
	(pwdgrp::add_group_from_windows): Declare with getting full group info.
	Called from internal_getgrfull.
	* uinfo.cc (pwdgrp::add_group_from_windows): Define.
	(pwdgrp::fetch_account_from_line): Add default case.
	(pwdgrp::fetch_account_from_file): Ditto.
	(pwdgrp::fetch_account_from_windows): Handle FULL_grp_arg.
	(client_request_pwdgrp::client_request_pwdgrp): Add default case.
	* userinfo.h: New header.
	(enum fetch_user_arg_type_t): Add FULL_grp_arg.
	(struct fetch_full_grp_t): New datatype.

winsup/cygwin/userinfo.h

@@ -0,0 +1,38 @@
+/* userinfo.h
+
+   Copyright 2015 Red Hat inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#pragma once
+
+enum fetch_user_arg_type_t {
+  SID_arg,
+  NAME_arg,
+  ID_arg,
+  FULL_grp_arg,
+};
+
+struct fetch_full_grp_t {
+  cygpsid sid;
+  PUNICODE_STRING name;
+  PUNICODE_STRING dom;
+  SID_NAME_USE acc_type;
+};
+
+struct fetch_user_arg_t
+{
+  fetch_user_arg_type_t type;
+  union {
+    cygpsid *sid;
+    const char *name;
+    uint32_t id;
+    fetch_full_grp_t *full_grp;
+  };
+  /* Only used in fetch_account_from_file/line. */
+  size_t len;
+};