Refactor Chrome's out-of-process Linux code into CrashGeneration{Server,Client} classes. Upstreamed from the Mozilla repository. Patch by Chris Jones <jones.chris.g@gmail.com> r=me at https://bugzilla.mozilla.org/show_bug.cgi?id=516759

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@515 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/linux/handler/exception_handler.cc

@@ -114,23 +114,26 @@ ExceptionHandler::ExceptionHandler(const std::string &dump_path,
                                    MinidumpCallback callback,
                                    void *callback_context,
                                    bool install_handler)
-    : filter_(filter),
-      callback_(callback),
-      callback_context_(callback_context),
-      dump_path_(),
-      handler_installed_(install_handler),
-      crash_handler_(NULL) {
-  set_dump_path(dump_path);
+  : filter_(filter),
+    callback_(callback),
+    callback_context_(callback_context),
+    handler_installed_(install_handler)
+{
+  Init(dump_path, -1);
+}
 
-  if (install_handler) {
-    InstallHandlers();
-
-    pthread_mutex_lock(&handler_stack_mutex_);
-      if (handler_stack_ == NULL)
-        handler_stack_ = new std::vector<ExceptionHandler *>;
-      handler_stack_->push_back(this);
-    pthread_mutex_unlock(&handler_stack_mutex_);
-  }
+ExceptionHandler::ExceptionHandler(const std::string &dump_path,
+                                   FilterCallback filter,
+                                   MinidumpCallback callback,
+                                   void* callback_context,
+                                   bool install_handler,
+                                   const int server_fd)
+  : filter_(filter),
+    callback_(callback),
+    callback_context_(callback_context),
+    handler_installed_(install_handler)
+{
+  Init(dump_path, server_fd);
 }
 
 // Runs before crashing: normal context.
@@ -138,6 +141,28 @@ ExceptionHandler::~ExceptionHandler() {
   UninstallHandlers();
 }
 
+void ExceptionHandler::Init(const std::string &dump_path,
+                            const int server_fd)
+{
+  crash_handler_ = NULL;
+
+  if (0 <= server_fd)
+    crash_generation_client_
+      .reset(CrashGenerationClient::TryCreate(server_fd));
+
+  if (handler_installed_)
+    InstallHandlers();
+
+  if (!IsOutOfProcess())
+    set_dump_path(dump_path);
+
+  pthread_mutex_lock(&handler_stack_mutex_);
+  if (handler_stack_ == NULL)
+    handler_stack_ = new std::vector<ExceptionHandler *>;
+  handler_stack_->push_back(this);
+  pthread_mutex_unlock(&handler_stack_mutex_);
+}
+
 // Runs before crashing: normal context.
 bool ExceptionHandler::InstallHandlers() {
   // We run the signal handlers on an alternative stack because we might have
@@ -280,6 +305,9 @@ bool ExceptionHandler::HandleSignal(int sig, siginfo_t* info, void* uc) {
 
 // This function may run in a compromised context: see the top of the file.
 bool ExceptionHandler::GenerateDump(CrashContext *context) {
+  if (IsOutOfProcess())
+    return crash_generation_client_->RequestDump(context, sizeof(*context));
+
   static const unsigned kChildStackSize = 8000;
   PageAllocator allocator;
   uint8_t* stack = (uint8_t*) allocator.Alloc(kChildStackSize);

src/client/linux/handler/exception_handler.h

@@ -35,6 +35,11 @@
 
 #include <signal.h>
 
+#include "client/linux/crash_generation/crash_generation_client.h"
+#include "processor/scoped_ptr.h"
+
+struct sigaction;
+
 namespace google_breakpad {
 
 // ExceptionHandler
@@ -116,6 +121,18 @@ class ExceptionHandler {
                    FilterCallback filter, MinidumpCallback callback,
                    void *callback_context,
                    bool install_handler);
+
+  // Creates a new ExceptionHandler instance that can attempt to
+  // perform out-of-process dump generation if server_fd is valid. If
+  // server_fd is invalid, in-process dump generation will be
+  // used. See the above ctor for a description of the other
+  // parameters.
+  ExceptionHandler(const std::string& dump_path,
+                   FilterCallback filter, MinidumpCallback callback,
+                   void* callback_context,
+                   bool install_handler,
+                   const int server_fd);
+
   ~ExceptionHandler();
 
   // Get and set the minidump path.
@@ -149,7 +166,14 @@ class ExceptionHandler {
     struct _libc_fpstate float_state;
   };
 
+  // Returns whether out-of-process dump generation is used or not.
+  bool IsOutOfProcess() const {
+      return crash_generation_client_.get() != NULL;
+  }
+
  private:
+  void Init(const std::string &dump_path,
+            const int server_fd);
   bool InstallHandlers();
   void UninstallHandlers();
   void PreresolveSymbols();
@@ -166,6 +190,8 @@ class ExceptionHandler {
   const MinidumpCallback callback_;
   void* const callback_context_;
 
+  scoped_ptr<CrashGenerationClient> crash_generation_client_;
+
   std::string dump_path_;
   std::string next_minidump_path_;
   std::string next_minidump_id_;
@@ -189,9 +215,8 @@ class ExceptionHandler {
   static unsigned handler_stack_index_;
   static pthread_mutex_t handler_stack_mutex_;
 
-  // A vector of the old signal handlers. The void* is a pointer to a newly
-  // allocated sigaction structure to avoid pulling in too many includes.
-  std::vector<std::pair<int, void *> > old_handlers_;
+  // A vector of the old signal handlers.
+  std::vector<std::pair<int, struct sigaction *> > old_handlers_;
 };
 
 }  // namespace google_breakpad

src/client/linux/handler/exception_handler_unittest.cc

@@ -38,20 +38,11 @@
 
 #include "client/linux/handler//exception_handler.h"
 #include "client/linux/minidump_writer/minidump_writer.h"
+#include "common/linux/eintr_wrapper.h"
 #include "common/linux/linux_libc_support.h"
 #include "common/linux/linux_syscall_support.h"
 #include "breakpad_googletest_includes.h"
 
-// This provides a wrapper around system calls which may be
-// interrupted by a signal and return EINTR. See man 7 signal.
-#define HANDLE_EINTR(x) ({ \
-  typeof(x) __eintr_result__; \
-  do { \
-    __eintr_result__ = x; \
-  } while (__eintr_result__ == -1 && errno == EINTR); \
-  __eintr_result__;\
-})
-
 using namespace google_breakpad;
 
 static void sigchld_handler(int signo) { }