Added boost stacktrace to segfault handler

CMakeLists.txt

@@ -221,6 +221,7 @@ set( fc_sources
      src/asio.cpp
      src/string.cpp
      src/shared_ptr.cpp
+     src/stacktrace.cpp
      src/time.cpp
      src/utf8.cpp
      src/io/iostream.cpp

include/fc/stacktrace.hpp

@@ -0,0 +1,16 @@
+// stacktrace.h (c) 2008, Timo Bingmann from http://idlebox.net/
+// published under the WTFPL v2.0
+
+// Downloaded from http://panthema.net/2008/0901-stacktrace-demangled/
+// and modified for C++ and FC by Steemit, Inc.
+
+#pragma once
+
+#include <iostream>
+
+namespace fc {
+
+void print_stacktrace(std::ostream& out);
+void print_stacktrace_on_segfault();
+
+}

src/stacktrace.cpp

@@ -0,0 +1,43 @@
+//
+// A stacktrace handler for bitshares
+//
+
+#include <signal.h>
+#include <fc/log/logger.hpp>
+
+// only include stacktrace stuff if boost >= 1.65
+#if BOOST_VERSION / 100000 >= 1 && ((BOOST_VERSION / 100) % 1000) >= 65
+#include <boost/stacktrace.hpp>
+
+namespace fc
+{
+
+static void segfault_signal_handler(int signum)
+{
+   ::signal(signum, SIG_DFL);
+   std::stringstream ss;
+   ss << boost::stacktrace::stacktrace();
+   elog(ss.str());
+   ::raise(SIGABRT);
+}
+
+void print_stacktrace_on_segfault()
+{
+   ::signal(SIGSEGV, &segfault_signal_handler);
+}
+
+void print_stacktrace(std::ostream& out)
+{
+   out << boost::stacktrace::stacktrace();
+}
+
+}
+#else
+
+namespace fc
+{
+void print_stacktrace_on_segfault() {}
+void print_stacktrace(std::ostream& out) {}
+}
+
+#endif

tests/CMakeLists.txt

@@ -57,6 +57,7 @@ add_executable( all_tests all_tests.cpp
                           bloom_test.cpp
                           real128_test.cpp
                           serialization_test.cpp
+                          stacktrace_test.cpp
                           time_test.cpp
                           utf8_test.cpp
                           variant_test.cpp

tests/stacktrace_test.cpp

@@ -0,0 +1,50 @@
+#include <boost/test/unit_test.hpp>
+
+#include <signal.h>
+#include <fc/stacktrace.hpp>
+#include <fc/thread/thread.hpp>
+
+BOOST_AUTO_TEST_SUITE(fc_stacktrace)
+
+BOOST_AUTO_TEST_CASE(stacktrace_test)
+{
+   // print the stack trace
+   std::stringstream ss;
+   fc::print_stacktrace(ss);
+   std::string results = ss.str();
+#if BOOST_VERSION / 100000 >= 1 && ((BOOST_VERSION / 100) % 1000) >= 65
+   BOOST_CHECK(!results.empty());
+   BOOST_CHECK(results.find("fc::print_stacktrace") != std::string::npos);
+#else
+   BOOST_CHECK(results.empty());
+#endif
+}
+
+BOOST_AUTO_TEST_CASE(threaded_stacktrace_test)
+{
+   fc::thread test_thread("a_thread");
+   std::string results = test_thread.async(
+         [] ()->std::string {
+               // cause a pause
+               for(int i = 0; i < 10000; i++);
+               std::stringstream ss;
+               fc::print_stacktrace(ss);
+               return ss.str();
+            }
+         ).wait();
+#if BOOST_VERSION / 100000 >= 1 && ((BOOST_VERSION / 100) % 1000) >= 65
+   BOOST_CHECK(!results.empty());
+   BOOST_CHECK(results.find("fc::print_stacktrace") != std::string::npos);
+#else
+   BOOST_CHECK(results.empty());
+#endif
+}
+
+/* this test causes a segfault on purpose to test the event handler
+BOOST_AUTO_TEST_CASE(cause_segfault)
+{
+   fc::print_stacktrace_on_segfault();
+   ::raise(SIGSEGV);
+}
+*/
+BOOST_AUTO_TEST_SUITE_END()