Moved crashcatcher to a component and also use it in CS

Reworked debugger detection (failed on gdb 7.11), it now uses /proc to detect the debugger

apps/opencs/editor.cpp

@@ -5,6 +5,9 @@
 #include <QLocalSocket>
 #include <QMessageBox>
 
+
+#include <components/crashcatcher/crashcatcher.hpp>
+
 #include <components/fallback/validate.hpp>
 
 #include <components/nifosg/nifloader.hpp>
@@ -18,12 +21,16 @@
 
 using namespace Fallback;
 
-CS::Editor::Editor ()
+CS::Editor::Editor (int argc, char **argv)
 : mSettingsState (mCfgMgr), mDocumentManager (mCfgMgr),
   mViewManager (mDocumentManager), mPid(""),
   mLock(), mMerge (mDocumentManager),
   mIpcServerName ("org.openmw.OpenCS"), mServer(NULL), mClientSocket(NULL)
 {    
+    // install the crash handler as soon as possible. note that the log path
+    // does not depend on config being read.
+    cc_install(argc, argv, (mCfgMgr.getLogPath() / "openmw-cs-crash.log").string());
+
     std::pair<Files::PathContainer, std::vector<std::string> > config = readConfig();
 
     setupDataFiles (config.first);

apps/opencs/editor.hpp

@@ -66,7 +66,7 @@ namespace CS
 
         public:
 
-            Editor ();
+            Editor (int argc, char **argv);
             ~Editor ();
 
             bool makeIPCServer();

apps/opencs/main.cpp

@@ -67,7 +67,7 @@ int main(int argc, char *argv[])
 
         application.setWindowIcon (QIcon (":./openmw-cs.png"));
 
-        CS::Editor editor;
+        CS::Editor editor(argc, argv);
 
         if(!editor.makeIPCServer())
         {

apps/openmw/CMakeLists.txt

@@ -11,12 +11,10 @@ if (ANDROID)
     set(GAME ${GAME} android_main.c)
 endif()
 
-if(NOT WIN32 AND NOT ANDROID)
-    set(GAME ${GAME} crashcatcher.cpp)
-endif()
 set(GAME_HEADER
     engine.hpp
 )
+
 source_group(game FILES ${GAME} ${GAME_HEADER})
 
 add_openmw_dir (mwrender

apps/openmw/main.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 
 #include <components/version/version.hpp>
+#include <components/crashcatcher/crashcatcher.hpp>
 #include <components/files/configurationmanager.hpp>
 #include <components/files/escape.hpp>
 #include <components/fallback/validate.hpp>
@@ -24,18 +25,6 @@
 #include <unistd.h>
 #endif
 
-#if (defined(__APPLE__) || (defined(__linux)  &&  !defined(ANDROID)) || (defined(__unix) &&  !defined(ANDROID)) || defined(__posix))
-    #define USE_CRASH_CATCHER 1
-#else
-    #define USE_CRASH_CATCHER 0
-#endif
-
-#if USE_CRASH_CATCHER
-#include <csignal>
-extern int cc_install_handlers(int argc, char **argv, int num_signals, int *sigs, const char *logfile, int (*user_info)(char*, char*));
-extern int is_debugger_attached(void);
-#endif
-
 /**
  * Workaround for problems with whitespaces in paths in older versions of Boost library
  */
@@ -339,18 +328,7 @@ int main(int argc, char**argv)
         std::cerr.rdbuf (&cerrsb);
 #endif
 
-
+        cc_install(argc, argv, (cfgMgr.getLogPath() / "crash.log").string());
-#if USE_CRASH_CATCHER
-        // Unix crash catcher
-        if ((argc == 2 && strcmp(argv[1], "--cc-handle-crash") == 0) || !is_debugger_attached())
-        {
-            int s[5] = { SIGSEGV, SIGILL, SIGFPE, SIGBUS, SIGABRT };
-            cc_install_handlers(argc, argv, 5, s, (cfgMgr.getLogPath() / "crash.log").string().c_str(), NULL);
-            std::cout << "Installing crash catcher" << std::endl;
-        }
-        else
-            std::cout << "Running in a debugger, not installing crash catcher" << std::endl;
-#endif
 
 #ifdef __APPLE__
         boost::filesystem::path binary_path = boost::filesystem::system_complete(boost::filesystem::path(argv[0]));

components/CMakeLists.txt

@@ -145,6 +145,12 @@ add_component_dir (fallback
     fallback validate
     )
 
+if(NOT WIN32 AND NOT ANDROID)
+    add_component_dir (crashcatcher
+        crashcatcher
+    )
+endif()
+
 set (ESM_UI ${CMAKE_SOURCE_DIR}/files/ui/contentselector.ui
     )
 

components/crashcatcher/crashcatcher.cpp

@@ -14,7 +14,11 @@
 #include <stdbool.h>
 #include <sys/ptrace.h>
 
-#include <string>
+#include <iostream>
+
+#include <boost/filesystem/fstream.hpp>
+
+namespace bfs = boost::filesystem;
 
 #include <SDL_messagebox.h>
 
@@ -454,19 +458,31 @@ int cc_install_handlers(int argc, char **argv, int num_signals, int *signals, co
     return retval;
 }
 
-
+static bool is_debugger_present()
-// gdb apparently opens FD(s) 3,4,5 (whereas a typical prog uses only stdin=0, stdout=1,stderr=2)
-bool
-is_debugger_attached(void)
 {
-    bool rc = false;
+    bfs::ifstream file((bfs::path("/proc/self/status")));
-    FILE *fd = fopen("/tmp", "r");
+    while (!file.eof())
-
-    if (fileno(fd) > 5)
     {
-        rc = true;
+        std::string word;
+        file >> word;
+        if (word == "TracerPid:")
+        {
+            file >> word;
+            return word != "0";
+        }
     }
+    return false;
+}
 
-    fclose(fd);
+void cc_install(int argc, char **argv, const std::string &crashLogPath)
-    return rc;
+{
+    if ((argc == 2 && strcmp(argv[1], "--cc-handle-crash") == 0) || !is_debugger_present())
+    {
+        int s[5] = { SIGSEGV, SIGILL, SIGFPE, SIGBUS, SIGABRT };
+        if (cc_install_handlers(argc, argv, 5, s, crashLogPath.c_str(), NULL) == -1)
+        {
+            std::cerr << "Installing crash handler failed" << std::endl;
+        } else
+            std::cout << "Crash handler installed" << std::endl;
+    }
 }

components/crashcatcher/crashcatcher.hpp

@@ -0,0 +1,18 @@
+#ifndef CRASHCATCHER_H
+#define CRASHCATCHER_H
+
+#include <string>
+
+#if (defined(__APPLE__) || (defined(__linux)  &&  !defined(ANDROID)) || (defined(__unix) &&  !defined(ANDROID)) || defined(__posix))
+    #define USE_CRASH_CATCHER 1
+#else
+    #define USE_CRASH_CATCHER 0
+#endif
+
+#if USE_CRASH_CATCHER
+extern void cc_install(int argc, char **argv, const std::string &crashLogPath);
+#else
+inline void cc_install(int, char **) { return 0; }
+#endif
+
+#endif