Add ANDROID_DLEXT_FORCE_LOAD flag

  This flag allows to force loading of the library
  in the case when for some reason multiple ELF files
  share the same filename (because the already-loaded
  library has been removed and overwritten, for example).

Change-Id: I798d44409ee13d63eaa75d685e99c4d028d2b0c1

1 files changed, 34 insertions, 0 deletions

diff --git a/tests/dlext_test.cpp b/tests/dlext_test.cpp
index ca6a75a95..700abff5e 100644
--- a/tests/dlext_test.cpp
+++ b/tests/dlext_test.cpp
@@ -173,6 +173,40 @@ TEST_F(DlExtTest, ExtInfoUseOffsetWihtoutFd) {
   ASSERT_STREQ("dlopen failed: invalid extended flag combination (ANDROID_DLEXT_USE_LIBRARY_FD_OFFSET without ANDROID_DLEXT_USE_LIBRARY_FD): 0x20", dlerror());
 }
 
+TEST(dlext, android_dlopen_ext_force_load_smoke) {
+  // 1. Open actual file
+  void* handle = dlopen("libdlext_test.so", RTLD_NOW);
+  ASSERT_DL_NOTNULL(handle);
+  // 2. Open link with force_load flag set
+  android_dlextinfo extinfo;
+  extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;
+  void* handle2 = android_dlopen_ext("libdlext_test_v2.so", RTLD_NOW, &extinfo);
+  ASSERT_DL_NOTNULL(handle2);
+  ASSERT_TRUE(handle != handle2);
+
+  dlclose(handle2);
+  dlclose(handle);
+}
+
+TEST(dlext, android_dlopen_ext_force_load_soname_exception) {
+  // Check if soname lookup still returns already loaded library
+  // when ANDROID_DLEXT_FORCE_LOAD flag is specified.
+  void* handle = dlopen("libdlext_test_v2.so", RTLD_NOW);
+  ASSERT_DL_NOTNULL(handle);
+
+  android_dlextinfo extinfo;
+  extinfo.flags = ANDROID_DLEXT_FORCE_LOAD;
+
+  // Note that 'libdlext_test.so' is dt_soname for libdlext_test_v2.so
+  void* handle2 = android_dlopen_ext("libdlext_test.so", RTLD_NOW, &extinfo);
+
+  ASSERT_DL_NOTNULL(handle2);
+  ASSERT_TRUE(handle == handle2);
+
+  dlclose(handle2);
+  dlclose(handle);
+}
+
 TEST(dlfcn, dlopen_from_zip_absolute_path) {
   const std::string lib_path = std::string(getenv("ANDROID_DATA")) + LIBZIPPATH;