Test dlopen with symlinked .so files

Bug: 9741592
Change-Id: I68c59d6f4e690136395c3dc3de13f99ce38de528
diff --git a/tests/Android.mk b/tests/Android.mk
index 785a9f1..10e288c 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -212,6 +212,19 @@
 build_target := SHARED_LIBRARY
 include $(LOCAL_PATH)/Android.build.mk
 
+# -----------------------------------------------------------------------------
+# create symlink to libdlext_test.so for symlink test
+# -----------------------------------------------------------------------------
+libdlext_origin := $(LOCAL_INSTALLED_MODULE)
+libdlext_sym := $(subst libdlext_test,libdlext_test_v2,$(libdlext_origin))
+$(libdlext_sym): $(libdlext_origin)
+	@echo "Symlink: $@ -> $(notdir $<)"
+	@mkdir -p $(dir $@)
+	$(hide) ln -sf $(notdir $<) $@
+
+ALL_MODULES := \
+  $(ALL_MODULES) $(libdlext_sym)
+
 libdlext_test_norelro_src_files := \
     dlext_test_library.cpp \
 
diff --git a/tests/dlfcn_test.cpp b/tests/dlfcn_test.cpp
index fc90dd9..1fdecdb 100644
--- a/tests/dlfcn_test.cpp
+++ b/tests/dlfcn_test.cpp
@@ -242,3 +242,11 @@
   void* addr = dlsym(RTLD_NEXT, "fopen");
   ASSERT_TRUE(addr != NULL);
 }
+
+TEST(dlfcn, dlopen_symlink) {
+  void* handle1 = dlopen("libdlext_test.so", RTLD_NOW);
+  void* handle2 = dlopen("libdlext_test_v2.so", RTLD_NOW);
+  ASSERT_TRUE(handle1 != NULL);
+  ASSERT_TRUE(handle2 != NULL);
+  ASSERT_EQ(handle1, handle2);
+}