Detect crashes while running native tests in APK.

testing/android/native_test_launcher.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// This class sets up the environment for running the native tests inside an
+// android application. It outputs (to logcat) markers identifying the
+// START/END/CRASH of the test suite, FAILURE/SUCCESS of individual tests etc.
+// These markers are read by the test runner script to generate test results.
+// It injects an event listener in gtest to detect various test stages and
+// installs signal handlers to detect crashes.
+
+#include <android/log.h>
+#include <signal.h>
 #include <stdio.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/path_utils.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/stringprintf.h"
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
 #include "base/test/test_suite.h"
 #include "testing/android/jni/chrome_native_test_activity_jni.h"
 #include "gtest/gtest.h"
 
 // GTest's main function.
 extern int main(int argc, char** argv);
 
 namespace {
 
+// The list of signals which are considered to be crashes.
+static const int kExceptionSignals[] = {

[John Grabowski, 2012/05/08 12:54:10]

'static' redundant (see below)

[nilesh, 2012/05/08 22:18:44]

Done.

+  SIGSEGV, SIGABRT, SIGFPE, SIGILL, SIGBUS, -1
+};
+
+static struct sigaction old_sa[NSIG];

[John Grabowski, 2012/05/08 12:54:10]

is inside an anonymous namespace so no need to also declare this as static.
In addition, per style guide, name this g_old_sa.
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Static_and_Glo...

[nilesh, 2012/05/08 22:18:44]

Done.

+
+// This function runs in a compromised context. It should not allocate memory.
+void SignalHandler(int sig, siginfo_t *info, void *reserved)
+{
+  // Output the crash marker.
+  __android_log_write(ANDROID_LOG_ERROR, "chromium", "[ CRASHED      ]");
+  old_sa[sig].sa_sigaction(sig, info, reserved);
+}
+
+void InstallHandlers() {
+  struct sigaction sa;
+  memset(&sa, 0, sizeof(sa));
+
+  sa.sa_sigaction = SignalHandler;
+  sa.sa_flags = SA_SIGINFO;
+
+  for (unsigned int i = 0; kExceptionSignals[i] != -1; ++i) {
+    sigaction(kExceptionSignals[i], &sa, &old_sa[kExceptionSignals[i]]);
+  }
+}
+
 void ParseArgsFromString(const std::string& command_line,
                          std::vector<std::string>* args) {
   StringTokenizer tokenizer(command_line, kWhitespaceASCII);
   tokenizer.set_quote_chars("\"");
   while (tokenizer.GetNext()) {
     std::string token;
     RemoveChars(tokenizer.token(), "\"", &token);
     args->push_back(token);
   }
 }
@@ skipping 144 matching lines @@
   // Set the application context in base.
   base::android::ScopedJavaLocalRef<jobject> scoped_context(
       env, env->NewLocalRef(app_context));
   base::android::InitApplicationContext(scoped_context);
 
   main(argc, &argv[0]);
 }
 
 // This is called by the VM when the shared library is first loaded.
 JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+
+  // Install signal handlers to detect crashes.
+  InstallHandlers();
+
   base::android::InitVM(vm);
   JNIEnv* env = base::android::AttachCurrentThread();
   if (!RegisterNativesImpl(env)) {
     return -1;
   }
   LibraryLoadedOnMainThread(env);
+
   return JNI_VERSION_1_4;
 }