Modified the debugger launching code so that only one instance of the
debugger is created per process.
This commit is contained in:
Eric Pouech
Alexandre Julliard
parent
20bc491dc7
commit
c04f405172
233
win32/except.c
233
win32/except.c
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@ -186,50 +186,22 @@ static int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *c
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return ret;
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}
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/*******************************************************************
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* UnhandledExceptionFilter (KERNEL32.@)
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/******************************************************************
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* start_debugger
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*
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* Does the effective debugger startup according to 'format'
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*/
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DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
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static BOOL start_debugger(PEXCEPTION_POINTERS epointers, HANDLE hEvent)
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{
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char format[256];
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char buffer[256];
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HKEY hDbgConf;
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DWORD bAuto = FALSE;
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DWORD ret = EXCEPTION_EXECUTE_HANDLER;
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int status;
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/* send a last chance event to the debugger */
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status = send_debug_event( epointers->ExceptionRecord, FALSE, epointers->ContextRecord );
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switch (status)
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{
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case DBG_CONTINUE:
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return EXCEPTION_CONTINUE_EXECUTION;
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case DBG_EXCEPTION_NOT_HANDLED:
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TerminateProcess( GetCurrentProcess(), epointers->ExceptionRecord->ExceptionCode );
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break; /* not reached */
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case 0: /* no debugger is present */
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if (epointers->ExceptionRecord->ExceptionCode == CONTROL_C_EXIT)
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{
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/* do not launch the debugger on ^C, simply terminate the process */
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TerminateProcess( GetCurrentProcess(), 1 );
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}
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break;
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default:
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FIXME("Unsupported yet debug continue value %d (please report)\n", status);
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}
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if (top_filter)
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{
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DWORD ret = top_filter( epointers );
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if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
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}
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/* FIXME: Should check the current error mode */
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PROCESS_INFORMATION info;
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STARTUPINFOA startup;
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char buffer[256];
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char format[256];
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if (!RegOpenKeyA(HKEY_LOCAL_MACHINE,
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"Software\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug",
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&hDbgConf)) {
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"Software\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug", &hDbgConf)) {
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DWORD type;
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DWORD count;
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@ -249,61 +221,150 @@ DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
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}
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RegCloseKey(hDbgConf);
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} else {
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/* format[0] = 0; */
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strcpy(format, "debugger/winedbg %ld %ld");
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/* try a default setup... */
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strcpy( format, "debugger/winedbg %ld %ld" );
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}
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if (!bAuto)
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{
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HMODULE mod = GetModuleHandleA( "user32.dll" );
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MessageBoxA_funcptr pMessageBoxA = NULL;
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if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
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if (pMessageBoxA)
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{
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format_exception_msg( epointers, buffer, sizeof(buffer) );
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if (pMessageBoxA( 0, buffer, "Exception raised", MB_YESNO | MB_ICONHAND ) == IDNO)
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{
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TRACE("Killing process\n");
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return EXCEPTION_EXECUTE_HANDLER;
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}
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}
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HMODULE mod = GetModuleHandleA( "user32.dll" );
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MessageBoxA_funcptr pMessageBoxA = NULL;
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if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
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if (pMessageBoxA)
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{
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format_exception_msg( epointers, buffer, sizeof(buffer) );
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if (pMessageBoxA( 0, buffer, "Exception raised", MB_YESNO | MB_ICONHAND ) == IDNO)
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{
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TRACE("Killing process\n");
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return FALSE;
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}
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}
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}
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if (format[0]) {
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HANDLE hEvent;
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PROCESS_INFORMATION info;
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STARTUPINFOA startup;
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OBJECT_ATTRIBUTES attr;
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attr.Length = sizeof(attr);
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attr.RootDirectory = 0;
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attr.Attributes = OBJ_INHERIT;
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attr.ObjectName = NULL;
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attr.SecurityDescriptor = NULL;
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attr.SecurityQualityOfService = NULL;
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TRACE("Starting debugger (fmt=%s)\n", format);
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NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, FALSE, FALSE );
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sprintf(buffer, format, GetCurrentProcessId(), hEvent);
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memset(&startup, 0, sizeof(startup));
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startup.cb = sizeof(startup);
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startup.dwFlags = STARTF_USESHOWWINDOW;
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startup.wShowWindow = SW_SHOWNORMAL;
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if (CreateProcessA(NULL, buffer, NULL, NULL,
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TRUE, 0, NULL, NULL, &startup, &info)) {
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WaitForSingleObject(hEvent, INFINITE);
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ret = EXCEPTION_CONTINUE_SEARCH;
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} else {
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ERR("Couldn't start debugger (%s) (%ld)\n"
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"Read the Wine Developers Guide on how to set up winedbg or another debugger\n",
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buffer, GetLastError());
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}
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CloseHandle(hEvent);
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} else {
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ERR("No standard debugger defined in the registry => no debugging session\n");
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TRACE("Starting debugger (fmt=%s)\n", format);
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sprintf(buffer, format, GetCurrentProcessId(), hEvent);
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memset(&startup, 0, sizeof(startup));
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startup.cb = sizeof(startup);
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startup.dwFlags = STARTF_USESHOWWINDOW;
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startup.wShowWindow = SW_SHOWNORMAL;
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if (CreateProcessA(NULL, buffer, NULL, NULL, TRUE, 0, NULL, NULL, &startup, &info)) {
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/* wait for debugger to come up... */
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WaitForSingleObject(hEvent, INFINITE);
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return TRUE;
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}
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return ret;
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ERR("Couldn't start debugger (%s) (%ld)\n"
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"Read the Wine Developers Guide on how to set up winedbg or another debugger\n",
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buffer, GetLastError());
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return FALSE;
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}
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/******************************************************************
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* start_debugger_atomic
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*
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* starts the debugger is an atomic way:
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* - either the debugger is not started and it is started
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* - either the debugger has already been started by an other thread
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* - either the debugger couldn't be started
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*
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* returns TRUE for the two first condition, FALSE for the last
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*/
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static int start_debugger_atomic(PEXCEPTION_POINTERS epointers)
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{
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static HANDLE hRunOnce /* = 0 */;
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if (hRunOnce == 0)
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{
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OBJECT_ATTRIBUTES attr;
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HANDLE hEvent;
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attr.Length = sizeof(attr);
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attr.RootDirectory = 0;
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attr.Attributes = OBJ_INHERIT;
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attr.ObjectName = NULL;
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attr.SecurityDescriptor = NULL;
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attr.SecurityQualityOfService = NULL;
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/* ask for manual reset, so that once the debugger is started, every thread will be
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* know it
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*/
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NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, TRUE, FALSE );
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if (InterlockedCompareExchange( (LPLONG)&hRunOnce, hEvent, 0 ) == 0)
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{
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/* ok, our event has been set... we're the winning thread */
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BOOL ret = start_debugger( epointers, hRunOnce );
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DWORD tmp;
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if (!ret)
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{
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/* so that the other threads won't be stuck */
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NtSetEvent( hRunOnce, &tmp );
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}
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return ret;
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}
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/* someone beat us here... */
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CloseHandle( hEvent );
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}
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/* and wait for the winner to have actually created the debugger */
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WaitForSingleObject( hRunOnce, INFINITE );
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/* in fact, here, we only know that someone has tried to start the debugger, we'll know
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* by reposting the exception if it has actually attached to the current process
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*/
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return TRUE;
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}
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/*******************************************************************
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* UnhandledExceptionFilter (KERNEL32.@)
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*/
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DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
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{
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int status;
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int loop = 0;
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for (loop = 0; loop <= 1; loop++)
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{
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/* send a last chance event to the debugger */
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status = send_debug_event( epointers->ExceptionRecord, FALSE, epointers->ContextRecord );
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switch (status)
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{
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case DBG_CONTINUE:
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return EXCEPTION_CONTINUE_EXECUTION;
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case DBG_EXCEPTION_NOT_HANDLED:
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TerminateProcess( GetCurrentProcess(), epointers->ExceptionRecord->ExceptionCode );
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break; /* not reached */
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case 0: /* no debugger is present */
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if (epointers->ExceptionRecord->ExceptionCode == CONTROL_C_EXIT)
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{
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/* do not launch the debugger on ^C, simply terminate the process */
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TerminateProcess( GetCurrentProcess(), 1 );
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}
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/* second try, the debugger isn't present... */
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if (loop == 1) return EXCEPTION_EXECUTE_HANDLER;
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break;
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default:
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FIXME("Unsupported yet debug continue value %d (please report)\n", status);
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return EXCEPTION_EXECUTE_HANDLER;
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}
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/* should only be there when loop == 0 */
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if (top_filter)
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{
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DWORD ret = top_filter( epointers );
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if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
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}
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/* FIXME: Should check the current error mode */
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if (!start_debugger_atomic( epointers ))
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return EXCEPTION_EXECUTE_HANDLER;
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/* now that we should have a debugger attached, try to resend event */
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}
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return EXCEPTION_EXECUTE_HANDLER;
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}
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