Introduce SetFirstChanceHandler with more strict signature

Eventually, I want to remove the current version of
SetFirstChanceHandler. That is why I changed the name of the current
callback type to FirstChanceHandlerDeprecated.

I also made sure that it is not possible to have two different
FirstChanceHandlers set at the same time.

This is the first of a set of CLs to clean up the API between Chrome,
BreakPad, and V8. See more information in the tracking bug.

R=mark@chromium.org

Bug: chromium:921971
Change-Id: Ia8c2fd9bd875c36dd7ae8bb4a02e538556bc67a1
Reviewed-on: https://chromium-review.googlesource.com/c/1411776
Reviewed-by: Mark Mentovai <mark@chromium.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/client/linux/handler/exception_handler.cc b/src/client/linux/handler/exception_handler.cc
index b895f6d7..0d7cd9cf 100644
--- a/src/client/linux/handler/exception_handler.cc
+++ b/src/client/linux/handler/exception_handler.cc
@@ -213,6 +213,7 @@ pthread_mutex_t g_handler_stack_mutex_ = PTHREAD_MUTEX_INITIALIZER;
 ExceptionHandler::CrashContext g_crash_context_;
 
 FirstChanceHandler g_first_chance_handler_ = nullptr;
+FirstChanceHandlerDeprecated g_first_chance_handler_deprecated_ = nullptr;
 }  // namespace
 
 // Runs before crashing: normal context.
@@ -338,6 +339,11 @@ void ExceptionHandler::SignalHandler(int sig, siginfo_t* info, void* uc) {
     return;
   }
 
+  if (g_first_chance_handler_deprecated_ != nullptr &&
+      g_first_chance_handler_deprecated_(sig, info, uc)) {
+    return;
+  }
+
   // All the exception signals are blocked at this point.
   pthread_mutex_lock(&g_handler_stack_mutex_);
 
@@ -791,7 +797,13 @@ bool ExceptionHandler::WriteMinidumpForChild(pid_t child,
 }
 
 void SetFirstChanceExceptionHandler(FirstChanceHandler callback) {
+  g_first_chance_handler_deprecated_ = nullptr;
   g_first_chance_handler_ = callback;
 }
 
+void SetFirstChanceExceptionHandler(FirstChanceHandlerDeprecated callback) {
+  g_first_chance_handler_ = nullptr;
+  g_first_chance_handler_deprecated_ = callback;
+}
+
 }  // namespace google_breakpad