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/**
* @file slplugin.cpp
* @brief Loader shell for plugins, intended to be launched by the plugin host application, which directly loads a plugin dynamic library.
*
* $LicenseInfo:firstyear=2008&license=viewergpl$
*
* Copyright (c) 2008, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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 "llpluginprocesschild.h"
#include "llpluginmessage.h"
#include "llerrorcontrol.h"
#include "llapr.h"
#include "llstring.h"
#if LL_DARWIN
#include <Carbon/Carbon.h>
#endif
#if LL_DARWIN || LL_LINUX
#include <signal.h>
#endif
/*
On Mac OS, since we call WaitNextEvent, this process will show up in the dock unless we set the LSBackgroundOnly flag in the Info.plist.
Normally non-bundled binaries don't have an info.plist file, but it's possible to embed one in the binary by adding this to the linker flags:
-sectcreate __TEXT __info_plist /path/to/slplugin_info.plist
which means adding this to the gcc flags:
-Wl,-sectcreate,__TEXT,__info_plist,/path/to/slplugin_info.plist
*/
#if LL_DARWIN || LL_LINUX
// Signal handlers to make crashes not show an OS dialog...
static void crash_handler(int sig)
{
// Just exit cleanly.
// TODO: add our own crash reporting
_exit(1);
}
#endif
#if LL_WINDOWS
#include <windows.h>
////////////////////////////////////////////////////////////////////////////////
// Our exception handler - will probably just exit and the host application
// will miss the heartbeat and log the error in the usual fashion.
LONG WINAPI myWin32ExceptionHandler( struct _EXCEPTION_POINTERS* exception_infop )
{
//std::cerr << "This plugin (" << __FILE__ << ") - ";
//std::cerr << "intercepted an unhandled exception and will exit immediately." << std::endl;
// TODO: replace exception handler before we exit?
return EXCEPTION_EXECUTE_HANDLER;
}
////////////////////////////////////////////////////////////////////////////////
// Hook our exception handler and replace the system one
void initExceptionHandler()
{
LPTOP_LEVEL_EXCEPTION_FILTER prev_filter;
// save old exception handler in case we need to restore it at the end
prev_filter = SetUnhandledExceptionFilter( myWin32ExceptionHandler );
}
bool checkExceptionHandler()
{
bool ok = true;
LPTOP_LEVEL_EXCEPTION_FILTER prev_filter;
prev_filter = SetUnhandledExceptionFilter(myWin32ExceptionHandler);
if (prev_filter != myWin32ExceptionHandler)
{
LL_WARNS("AppInit") << "Our exception handler (" << (void *)myWin32ExceptionHandler << ") replaced with " << prev_filter << "!" << LL_ENDL;
ok = false;
}
if (prev_filter == NULL)
{
ok = FALSE;
if (myWin32ExceptionHandler == NULL)
{
LL_WARNS("AppInit") << "Exception handler uninitialized." << LL_ENDL;
}
else
{
LL_WARNS("AppInit") << "Our exception handler (" << (void *)myWin32ExceptionHandler << ") replaced with NULL!" << LL_ENDL;
}
}
return ok;
}
#endif
// If this application on Windows platform is a console application, a console is always
// created which is bad. Making it a Windows "application" via CMake settings but not
// adding any code to explicitly create windows does the right thing.
#if LL_WINDOWS
int APIENTRY WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
#else
int main(int argc, char **argv)
#endif
{
ll_init_apr();
// Set up llerror logging
{
LLError::initForApplication(".");
LLError::setDefaultLevel(LLError::LEVEL_INFO);
// LLError::setTagLevel("Plugin", LLError::LEVEL_DEBUG);
// LLError::logToFile("slplugin.log");
}
#if LL_WINDOWS
if( strlen( lpCmdLine ) == 0 )
{
LL_ERRS("slplugin") << "usage: " << "SLPlugin" << " launcher_port" << LL_ENDL;
};
U32 port = 0;
if(!LLStringUtil::convertToU32(lpCmdLine, port))
{
LL_ERRS("slplugin") << "port number must be numeric" << LL_ENDL;
};
// Insert our exception handler into the system so this plugin doesn't
// display a crash message if something bad happens. The host app will
// see the missing heartbeat and log appropriately.
initExceptionHandler();
#elif LL_DARWIN || LL_LINUX
if(argc < 2)
{
LL_ERRS("slplugin") << "usage: " << argv[0] << " launcher_port" << LL_ENDL;
}
U32 port = 0;
if(!LLStringUtil::convertToU32(argv[1], port))
{
LL_ERRS("slplugin") << "port number must be numeric" << LL_ENDL;
}
// Catch signals that most kinds of crashes will generate, and exit cleanly so the system crash dialog isn't shown.
signal(SIGILL, &crash_handler); // illegal instruction
# if LL_DARWIN
signal(SIGEMT, &crash_handler); // emulate instruction executed
# endif // LL_DARWIN
signal(SIGFPE, &crash_handler); // floating-point exception
signal(SIGBUS, &crash_handler); // bus error
signal(SIGSEGV, &crash_handler); // segmentation violation
signal(SIGSYS, &crash_handler); // non-existent system call invoked
#endif
LLPluginProcessChild *plugin = new LLPluginProcessChild();
plugin->init(port);
LLTimer timer;
timer.start();
#if LL_WINDOWS
checkExceptionHandler();
#endif
while(!plugin->isDone())
{
timer.reset();
plugin->idle();
#if LL_DARWIN
{
// Some plugins (webkit at least) will want an event loop. This qualifies.
EventRecord evt;
WaitNextEvent(0, &evt, 0, NULL);
}
#endif
F64 elapsed = timer.getElapsedTimeF64();
F64 remaining = plugin->getSleepTime() - elapsed;
if(remaining <= 0.0f)
{
// We've already used our full allotment.
// LL_INFOS("slplugin") << "elapsed = " << elapsed * 1000.0f << " ms, remaining = " << remaining * 1000.0f << " ms, not sleeping" << LL_ENDL;
// Still need to service the network...
plugin->pump();
}
else
{
// LL_INFOS("slplugin") << "elapsed = " << elapsed * 1000.0f << " ms, remaining = " << remaining * 1000.0f << " ms, sleeping for " << remaining * 1000.0f << " ms" << LL_ENDL;
// timer.reset();
// This also services the network as needed.
plugin->sleep(remaining);
// LL_INFOS("slplugin") << "slept for "<< timer.getElapsedTimeF64() * 1000.0f << " ms" << LL_ENDL;
}
#if LL_WINDOWS
// More agressive checking of interfering exception handlers.
// Doesn't appear to be required so far - even for plugins
// that do crash with a single call to the intercept
// exception handler such as QuickTime.
//checkExceptionHandler();
#endif
}
delete plugin;
ll_cleanup_apr();
return 0;
}
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