Add signal handlers for host builds to imitate debuggerd.
This isn't going to be as reliable as debuggerd because we're running inside
the crashed process. We could always build debuggerd for the host, and have
something to call out to that. But for now, this gives us most of the
information most of the time...
Change-Id: I992ffb3bdb2903e4b83bd5666108ebe12a813338
diff --git a/src/signal_set.h b/src/signal_set.h
new file mode 100644
index 0000000..030a2d1
--- /dev/null
+++ b/src/signal_set.h
@@ -0,0 +1,62 @@
+/*
+ * 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 ART_SRC_SIGNAL_SET_H_
+#define ART_SRC_SIGNAL_SET_H_
+
+#include <signal.h>
+
+#include "logging.h"
+
+namespace art {
+
+class SignalSet {
+ public:
+ SignalSet() {
+ if (sigemptyset(&set_) == -1) {
+ PLOG(FATAL) << "sigemptyset failed";
+ }
+ }
+
+ void Add(int signal) {
+ if (sigaddset(&set_, signal) == -1) {
+ PLOG(FATAL) << "sigaddset " << signal << " failed";
+ }
+ }
+
+ void Block() {
+ if (sigprocmask(SIG_BLOCK, &set_, NULL) == -1) {
+ PLOG(FATAL) << "sigprocmask failed";
+ }
+ }
+
+ int Wait() {
+ // Sleep in sigwait() until a signal arrives. gdb causes EINTR failures.
+ int signal_number;
+ int rc = TEMP_FAILURE_RETRY(sigwait(&set_, &signal_number));
+ if (rc != 0) {
+ PLOG(FATAL) << "sigwait failed";
+ }
+ return signal_number;
+ }
+
+ private:
+ sigset_t set_;
+};
+
+} // namespace art
+
+#endif // ART_SRC_SIGNAL_SET_H_