[channel] Add a test case for the request foo in gsm_subscriber.c

This is simulating a successfull request and is causing
a segfault. The test is done with a "mock object" in this
case a minimalistic paging implementation which is enough
to show the crash.

Compare that the callback data is supposed to be the same....

openbsc/configure.in

@@ -45,4 +45,5 @@ AC_OUTPUT(
     tests/sms/Makefile
     tests/gsm0408/Makefile
     tests/db/Makefile
+    tests/channel/Makefile
     Makefile)

openbsc/tests/Makefile.am

@@ -1 +1 @@
-SUBDIRS = debug timer sms gsm0408 db
+SUBDIRS = debug timer sms gsm0408 db channel

openbsc/tests/channel/Makefile.am

@@ -0,0 +1,14 @@
+INCLUDES = $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS=-Wall -ggdb3
+
+noinst_PROGRAMS = channel_test
+
+channel_test_SOURCES = channel_test.c \
+	$(top_srcdir)/src/db.c \
+	$(top_srcdir)/src/gsm_subscriber.c \
+	$(top_srcdir)/src/debug.c \
+	$(top_srcdir)/src/timer.c \
+	$(top_srcdir)/src/select.c \
+	$(top_srcdir)/src/gsm_data.c
+channel_test_LDADD = -ldl -ldbi
+

openbsc/tests/channel/channel_test.c

@@ -0,0 +1,72 @@
+/*
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdio.h>
+
+#include <assert.h>
+
+#include <openbsc/select.h>
+#include <openbsc/gsm_subscriber.h>
+#include <openbsc/abis_rsl.h>
+
+/* our handler */
+static int subscr_cb(unsigned int hook, unsigned int event, struct msgb *msg, void *data, void *param)
+{
+	assert(hook == 101);
+	assert(event == 200);
+	assert(msg == (void*)0x1323L);
+	assert(data == (void*)0x4242L);
+	assert(param == (void*)0x2342L);
+	printf("Reached, didn't crash, test passed\n");
+	return 0;
+}
+
+/* mock object for testing, directly invoke the cb... maybe later through the timer */
+void paging_request(struct gsm_bts *bts, struct gsm_subscriber *subscriber, int type, gsm_cbfn *cbfn, void *data)
+{
+	cbfn(101, 200, (void*)0x1323L, (void*)0x4242L, data);
+}
+
+
+int main(int argc, char** argv)
+{
+	struct gsm_network network;
+
+	printf("Testing the gsm_subscriber chan logic\n");
+
+	/* Create a dummy network */
+	network.bts[0].location_area_code = 23;
+	network.bts[0].network = &network;
+
+	/* Create a dummy subscriber */
+	struct gsm_subscriber *subscr = subscr_alloc();
+	subscr->lac = 23;
+
+	/* Ask for a channel... */
+	subscr_get_channel(subscr, &network, RSL_CHANNEED_TCH_F, subscr_cb, (void*)0x2342L);
+
+	while (1) {
+		bsc_select_main(0);
+	}
+}
+
+void nm_state_event() {}
+void input_event() {}
+