Fix MacOSX signal handler (#277)

Author: zhengyu123

ddprof-lib/src/main/cpp/os_dd.h

@@ -7,10 +7,7 @@
 namespace ddprof {
 class OS : public ::OS {
 public:
-  inline static SigAction replaceSigsegvHandler(SigAction action) {
-    return ::OS::replaceCrashHandler(action);
-  }
-
+  static SigAction replaceSigsegvHandler(SigAction action);
   static SigAction replaceSigbusHandler(SigAction action);
 
   inline static int getMaxThreadId(int floor) {

ddprof-lib/src/main/cpp/os_linux_dd.cpp

@@ -29,6 +29,10 @@ void ddprof::OS::mallocArenaMax(int arena_max) {
 #endif
 }
 
+SigAction ddprof::OS::replaceSigsegvHandler(SigAction action) {
+  return ::OS::replaceCrashHandler(action);
+}
+
 SigAction ddprof::OS::replaceSigbusHandler(SigAction action) {
   struct sigaction sa;
   sigaction(SIGBUS, NULL, &sa);

ddprof-lib/src/main/cpp/os_macos_dd.cpp

@@ -17,11 +17,15 @@ void ddprof::OS::mallocArenaMax(int arena_max) {
 }
 
 SigAction ddprof::OS::replaceSigbusHandler(SigAction action) {
+  return ::OS::replaceCrashHandler(action);
+}
+
+SigAction ddprof::OS::replaceSigsegvHandler(SigAction action) {
   struct sigaction sa;
-  sigaction(SIGBUS, NULL, &sa);
+  sigaction(SIGSEGV, NULL, &sa);
   SigAction old_action = sa.sa_sigaction;
   sa.sa_sigaction = action;
-  sigaction(SIGBUS, &sa, NULL);
+  sigaction(SIGSEGV, &sa, NULL);
   return old_action;
 }