Add rxgk_GetServerInfo stub

Provide a stub function that libafsrpc can export when rxgk support
is disabled.  (It always returns failure, of course.)

Change-Id: Id9f816d25c1a8f56995ec185ae83db0924de0010
Reviewed-on: https://gerrit.openafs.org/12721
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>

Makefile.in

@@ -187,7 +187,7 @@ roken: config
 rxgen: $(DIR_roken) config
 	+${COMPILE_PART1} rxgen ${COMPILE_PART2}
 
-rx: config lwp rxgen rx_depinstall util
+rx: config lwp rxgen rx_depinstall util rxgk_depinstall
 	+${COMPILE_PART1} rx ${COMPILE_PART2}
 
 rxstat: rx rxstat_depinstall

src/rx/Makefile.in

@@ -18,6 +18,7 @@ LT_objs = xdr.lo xdr_array.lo xdr_rx.lo xdr_mem.lo xdr_len.lo xdr_afsuuid.lo \
 	  rx_pthread.lo rx.lo rx_null.lo rx_globals.lo rx_getaddr.lo rx_misc.lo \
 	  rx_packet.lo rx_peer.lo rx_rdwr.lo rx_trace.lo rx_conncache.lo \
 	  rx_opaque.lo rx_identity.lo rx_stats.lo rx_multi.lo \
+	  rx_stubs.lo \
 	  AFS_component_version_number.lo
 LT_deps = $(top_builddir)/src/opr/liboafs_opr.la
 LT_libs = $(MT_LIBS)

src/rx/rx_stubs.c

@@ -0,0 +1,59 @@
+/* rx/rx_stubs.c - Stub functions for things not really implemented. */
+/*
+ * Copyright (C) 2017 by Benjamin Kaduk.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file
+ * Stub functions that don't have anyplace better to live.
+ * For example, libafsrpc is going to export an rxgk_GetServerInfo
+ * routine whether or not rxgk support is enabled at configure time.
+ * But src/rxgk is not compiled at all in that case, so we need a home
+ * for the stub function that will be exported in that case.
+ */
+
+#include <afsconfig.h>
+#include <afs/param.h>
+#include <afs/stds.h>
+
+#ifndef ENABLE_RXGK
+
+#include <rx/rx.h>
+#include <rx/rxgk.h>
+#include <rx/rx_identity.h>
+
+#include <errno.h>
+
+afs_int32
+rxgk_GetServerInfo(struct rx_connection *conn, RXGK_Level *level,
+		   rxgkTime *expiry, struct rx_identity **identity)
+{
+    return EINVAL;
+}
+#endif	/* !ENABLE_RXGK */