upload android base code part3

android/bionic/tests/ScopedSignalHandler.h

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _BIONIC_TESTS_SCOPED_SIGNAL_HANDLER_H
+#define _BIONIC_TESTS_SCOPED_SIGNAL_HANDLER_H
+
+#include <signal.h>
+#include <string.h>
+
+class ScopedSignalHandler {
+ public:
+  ScopedSignalHandler(int signal_number, void (*handler)(int), int sa_flags = 0)
+      : signal_number_(signal_number) {
+    memset(&action_, 0, sizeof(action_));
+    action_.sa_flags = sa_flags;
+    action_.sa_handler = handler;
+    sigaction(signal_number_, &action_, &old_action_);
+  }
+
+  ScopedSignalHandler(int signal_number, void (*action)(int, siginfo_t*, void*),
+                      int sa_flags = SA_SIGINFO)
+      : signal_number_(signal_number) {
+    memset(&action_, 0, sizeof(action_));
+    action_.sa_flags = sa_flags;
+    action_.sa_sigaction = action;
+    sigaction(signal_number_, &action_, &old_action_);
+  }
+
+  ScopedSignalHandler(int signal_number) : signal_number_(signal_number) {
+    sigaction(signal_number, nullptr, &old_action_);
+  }
+
+  ~ScopedSignalHandler() {
+    sigaction(signal_number_, &old_action_, NULL);
+  }
+
+ private:
+  struct sigaction action_;
+  struct sigaction old_action_;
+  const int signal_number_;
+};
+
+class ScopedSignalMask {
+ public:
+  ScopedSignalMask() {
+    sigprocmask(SIG_SETMASK, nullptr, &old_mask_);
+  }
+
+  ~ScopedSignalMask() {
+    sigprocmask(SIG_SETMASK, &old_mask_, nullptr);
+  }
+
+ private:
+  sigset_t old_mask_;
+};
+
+#endif // _BIONIC_TESTS_SCOPED_SIGNAL_HANDLER_H