Initial commit

Torque/SDK/engine/platformX86UNIX/x86UNIXProcessControl.cc

@@ -0,0 +1,192 @@
+//-----------------------------------------------------------------------------
+// Torque Game Engine 
+// Copyright (C) GarageGames.com, Inc.
+//-----------------------------------------------------------------------------
+
+
+
+#include "platformX86UNIX/platformX86UNIX.h"
+#include "platformX86UNIX/x86UNIXState.h"
+#include "platformX86UNIX/x86UNIXStdConsole.h"
+#include "platformX86UNIX/x86UNIXMutex.h"
+#include "platform/gameInterface.h"
+#include "platform/platformVideo.h"
+#include "platform/platformInput.h"
+#include "console/console.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+
+#ifndef DEDICATED
+#include <SDL/SDL.h>
+#endif
+
+extern void SendQuitEvent();
+
+ProcessMutex pMutex;
+
+//-----------------------------------------------------------------------------
+// This is a mainly a debugging function for intercepting a nonzero exit code
+// and generating a core dump for a stack trace.
+// Need an S64 here because postQuitMessage uses a U32, and 
+// forceshutdown uses an S32.  So S64 is needed to
+// accomodate them both
+static void CheckExitCode(S64 exitCode)
+{
+   if (exitCode != 0)
+   {
+      Con::errorf(ConsoleLogEntry::General, 
+         "Nonzero exit code: %d, triggering SIGSEGV for core dump",
+         exitCode);
+      kill(getpid(), SIGSEGV);
+   }
+}
+
+//-----------------------------------------------------------------------------
+static void SignalHandler(int sigtype)
+{
+   if (sigtype == SIGSEGV || sigtype == SIGTRAP)
+   {
+      signal(SIGSEGV, SIG_DFL);
+      signal(SIGTRAP, SIG_DFL);
+      // restore the signal handling to default so that we don't get into 
+      // a crash loop with ImmediateShutdown
+      ImmediateShutdown(-sigtype, sigtype);
+   }
+   else
+   {
+      signal(sigtype, SIG_DFL);
+      dPrintf("Unknown signal caught by SignalHandler: %d\n", sigtype);
+      dFflushStdout();
+      // exit to be safe
+      ImmediateShutdown(1);
+   }
+}
+
+//-----------------------------------------------------------------------------
+void Cleanup(bool minimal)
+{
+   if (!minimal)
+   {
+      Video::destroy();
+      Input::destroy();
+   }
+
+   StdConsole::destroy();
+#ifndef DEDICATED
+   GLLoader::OpenGLShutdown();
+   SDL_Quit();
+#endif
+//    Display* display = x86UNIXState->GetDisplayPointer();
+//    if (display != NULL)
+//       XCloseDisplay(display);
+   pMutex.release();
+}
+
+//-----------------------------------------------------------------------------
+void ImmediateShutdown(S32 exitCode, S32 signalNum)
+{
+   bool segfault = signalNum > 0;
+
+   Cleanup(segfault);
+
+   if (!segfault)
+   {
+      dPrintf("Exiting\n");
+      // exit (doesn't call destructors)
+      _exit(exitCode);
+   }
+   else
+   {
+// there is a problem in kernel 2.4.17 which causes a hang when a segfault 
+// occurs.  also subsequent runs of "ps" will hang and the machine has to be
+// hard reset to clear up the problem
+// JMQ: this bug appears to be fixed in 2.4.18
+//#define KERNEL_2_4_WORKAROUND
+#ifdef KERNEL_2_4_WORKAROUND
+      dPrintf("Segmentation Fault (Exiting without core dump due to #define KERNEL_2_4_WORKAROUND)\n");
+      dFflushStdout();
+      _exit(exitCode);
+#else
+      // kill with signal
+      kill(getpid(), signalNum);
+#endif
+   }
+
+}
+
+//-----------------------------------------------------------------------------
+void ProcessControlInit()
+{
+   // JMQ: ignore IO signals background read/write terminal (so that we don't
+   // get suspended in daemon mode)
+   signal(SIGTTIN, SIG_IGN);
+   signal(SIGTTOU, SIG_IGN);
+
+   // we're not interested in the exit status of child processes, so this 
+   // prevents zombies from accumulating.
+#if defined(__FreeBSD__)
+   signal(SIGCHLD, SIG_IGN);
+#else
+   signal(SIGCLD, SIG_IGN);
+#endif
+
+   // install signal handler for SIGSEGV, so that we can attempt
+   // clean shutdown
+   signal(SIGSEGV, &SignalHandler);
+   signal(SIGTRAP, &SignalHandler);
+}
+
+//-----------------------------------------------------------------------------
+bool AcquireProcessMutex(const char *mutexName)
+{
+   return pMutex.acquire(mutexName);
+}
+
+//-----------------------------------------------------------------------------
+void Platform::postQuitMessage(const U32 in_quitVal)
+{
+   // if we have a window send a quit event, otherwise just force shutdown
+#ifndef DEDICATED
+   if (x86UNIXState->windowCreated())
+   {
+      CheckExitCode(in_quitVal);
+      SendQuitEvent();
+   }
+   else
+#endif
+   {
+      forceShutdown(in_quitVal);
+   }
+}
+
+//-----------------------------------------------------------------------------
+void Platform::debugBreak()
+{
+   // in windows, "Calling DebugBreak causes the program to display 
+   // a dialog box as if it had crashed."  So we segfault.
+   Con::errorf(ConsoleLogEntry::General, 
+      "Platform::debugBreak: triggering SIGSEGV for core dump");
+   //kill(getpid(), SIGSEGV);
+   kill(getpid(), SIGTRAP);
+}
+
+//-----------------------------------------------------------------------------
+void Platform::forceShutdown(S32 returnValue)
+{
+   CheckExitCode(returnValue);
+
+   // if a dedicated server is running, turn it off
+   if (x86UNIXState->isDedicated() && Game->isRunning())
+      Game->setRunning(false);
+   else
+      ImmediateShutdown(returnValue);
+}
+
+//-----------------------------------------------------------------------------
+// testing function
+ConsoleFunction(debug_debugbreak, void, 1, 1, "debug_debugbreak()")
+{
+   Platform::debugBreak();
+}