Imported existing code

indra/llcommon/llerrorthread.cpp

@@ -0,0 +1,213 @@
+/** 
+ * @file llerrorthread.cpp
+ *
+ * $LicenseInfo:firstyear=2004&license=viewergpl$
+ * 
+ * Copyright (c) 2004-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#include "linden_common.h"
+#include "llerrorthread.h"
+#include "llapp.h"
+
+LLErrorThread::LLErrorThread()
+	: LLThread("Error"),
+	  mUserDatap(NULL)
+{
+}
+
+LLErrorThread::~LLErrorThread()
+{
+}
+
+void LLErrorThread::setUserData(void* user_data)
+{
+	mUserDatap = user_data;
+}
+
+
+void* LLErrorThread::getUserData() const
+{
+	return mUserDatap;
+}
+
+#if !LL_WINDOWS
+//
+// Various signal/error handling functions that can't be put into the class
+//
+void get_child_status(const int waitpid_status, int &process_status, bool &exited, bool do_logging)
+{
+	exited = false;
+	process_status = -1;
+	// The child process exited.  Call its callback, and then clean it up
+	if (WIFEXITED(waitpid_status))
+	{
+		process_status = WEXITSTATUS(waitpid_status);
+		exited = true;
+		if (do_logging)
+		{
+			llinfos << "get_child_status - Child exited cleanly with return of " << process_status << llendl;
+		}
+		return;
+	}
+	else if (WIFSIGNALED(waitpid_status))
+	{
+		process_status = WTERMSIG(waitpid_status);
+		exited = true;
+		if (do_logging)
+		{
+			llinfos << "get_child_status - Child died because of uncaught signal " << process_status << llendl;
+#ifdef WCOREDUMP
+			if (WCOREDUMP(waitpid_status))
+			{
+				llinfos << "get_child_status - Child dumped core" << llendl;
+			}
+			else
+			{
+				llinfos << "get_child_status - Child didn't dump core" << llendl;
+			}
+#endif
+		}
+		return;
+	}
+	else if (do_logging)
+	{
+		// This is weird.  I just dump the waitpid status into the status code,
+		// not that there's any way of telling what it is...
+		llinfos << "get_child_status - Got SIGCHILD but child didn't exit" << llendl;
+		process_status = waitpid_status;
+	}
+
+}
+#endif
+
+void LLErrorThread::run()
+{
+	LLApp::sErrorThreadRunning = TRUE;
+	// This thread sits and waits for the sole purpose
+	// of waiting for the signal/exception handlers to flag the
+	// application state as APP_STATUS_ERROR.
+	llinfos << "thread_error - Waiting for an error" << llendl;
+
+	S32 counter = 0;
+#if !LL_WINDOWS
+	U32 last_sig_child_count = 0;
+#endif
+	while (1)
+	{
+		if (LLApp::isError() || LLApp::isStopped())
+		{
+			// The application has stopped running, time to take action (maybe)
+			break;
+		}
+#if !LL_WINDOWS
+		// Check whether or not the main thread had a sig child we haven't handled.
+		U32 current_sig_child_count = LLApp::getSigChildCount();
+		if (last_sig_child_count != current_sig_child_count)
+		{
+			int status = 0;
+			pid_t child_pid = 0;
+			last_sig_child_count = current_sig_child_count;
+			if (LLApp::sLogInSignal)
+			{
+				llinfos << "thread_error handling SIGCHLD #" << current_sig_child_count << llendl;
+			}
+			for (LLApp::child_map::iterator iter = LLApp::sChildMap.begin(); iter != LLApp::sChildMap.end();)
+			{
+				child_pid = iter->first;
+				LLChildInfo &child_info = iter->second;
+				// check the status of *all* children, in case we missed a signal
+				if (0 != waitpid(child_pid, &status, WNOHANG))
+				{
+					bool exited = false;
+					int exit_status = -1;
+					get_child_status(status, exit_status, exited, LLApp::sLogInSignal);
+
+					if (child_info.mCallback)
+					{
+						if (LLApp::sLogInSignal)
+						{
+							llinfos << "Signal handler - Running child callback" << llendl;
+						}
+						child_info.mCallback(child_pid, exited, status);
+					}
+					LLApp::sChildMap.erase(iter++);
+				}
+				else
+				{
+					// Child didn't terminate, yet we got a sigchild somewhere...
+					if (child_info.mGotSigChild && child_info.mCallback)
+					{
+						child_info.mCallback(child_pid, false, 0);
+					}
+					child_info.mGotSigChild = FALSE;
+					iter++;
+				}
+			}
+
+			// check the status of *all* children, in case we missed a signal
+			// Same as above, but use the default child callback
+			while(0 < (child_pid = waitpid( -1, &status, WNOHANG )))
+			{
+				if (0 != waitpid(child_pid, &status, WNOHANG))
+				{
+					bool exited = false;
+					int exit_status = -1;
+					get_child_status(status, exit_status, exited, LLApp::sLogInSignal);
+					if (LLApp::sDefaultChildCallback)
+					{
+						if (LLApp::sLogInSignal)
+						{
+							llinfos << "Signal handler - Running default child callback" << llendl;
+						}
+						LLApp::sDefaultChildCallback(child_pid, true, status);
+					}
+				}
+			}
+		}
+
+
+#endif
+		ms_sleep(10);
+		counter++;
+	}
+	if (LLApp::isError())
+	{
+		// The app is in an error state, run the application's error handler.
+		//llinfos << "thread_error - An error has occurred, running error callback!" << llendl;
+		// Run the error handling callback
+		LLApp::runErrorHandler();
+	}
+	else
+	{
+		// Everything is okay, a clean exit.
+		//llinfos << "thread_error - Application exited cleanly" << llendl;
+	}
+	
+	//llinfos << "thread_error - Exiting" << llendl;
+	LLApp::sErrorThreadRunning = FALSE;
+}
+