From a8d7cd1835fdef40edb990a526d340fc016e0310 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Tue, 30 Sep 2014 16:14:20 -0700
Subject: [PATCH] hooks

---
 src/bitcoindjs.cc | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/src/bitcoindjs.cc b/src/bitcoindjs.cc
index c0d6ffb1..7eee33ff 100644
--- a/src/bitcoindjs.cc
+++ b/src/bitcoindjs.cc
@@ -86,9 +86,11 @@
  *  ~/bitcoin/src/main.h
  */
 
+extern "C" {
 #include <stdint.h>
 #include <signal.h>
 #include <stdio.h>
+}
 
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/filesystem.hpp>
@@ -2367,6 +2369,63 @@ jstx_to_ctx(const Local<Object> entry, CTransaction& tx, uint256 hashBlock) {
 }
 #endif
 
+/**
+ * Hooks
+ */
+
+#if 0
+static int last_height = -1;
+
+extern "C" void __attribute__ ((constructor))
+trace_begin(void) {
+  return;
+}
+
+extern "C" void __attribute__ ((destructor))
+trace_end(void) {
+  return;
+}
+
+extern "C" void
+__cyg_profile_func_enter(void *func,  void *caller) {
+  return;
+}
+
+extern "C" void
+__cyg_profile_func_exit(void *func, void *caller) {
+  int cur_height = chainActive.Height();
+  if (cur_height != last_height) {
+    printf("new block\n");
+    last_height = cur_height;
+  }
+  // if (func == &AcceptBlock || caller == &AcceptBlock || func == AcceptBlock || caller == AcceptBlock) {
+  //   printf("accept block\n");
+  // }
+}
+#endif
+
+extern "C" {
+  #include <stdio.h>
+  #include <stdlib.h>
+  #include <sys/types.h>
+  #include <sys/stat.h>
+  #include <unistd.h>
+
+  int printf(const char *, ...);
+  void __cyg_profile_func_enter(void *this_fn, void *call_site) __attribute__((no_instrument_function));
+  void __cyg_profile_func_exit(void *this_fn, void *call_site) __attribute__((no_instrument_function));
+}
+
+void __cyg_profile_func_enter(void *this_fn, void *call_site) {
+  printf("enter\n");
+  (void)call_site;
+}
+
+void __cyg_profile_func_exit(void *this_fn, void *call_site) {
+  printf("exit\n");
+  (void)call_site;
+}
+
 /**
  * Init
  */