diff options
Diffstat (limited to 'win/tclWinLoad.c')
| -rw-r--r-- | win/tclWinLoad.c | 242 |
1 files changed, 196 insertions, 46 deletions
diff --git a/win/tclWinLoad.c b/win/tclWinLoad.c index c4d08e8..b59ccba 100644 --- a/win/tclWinLoad.c +++ b/win/tclWinLoad.c @@ -13,6 +13,23 @@ #include "tclWinInt.h" +/* + * Native name of the directory in the native filesystem where DLLs used in + * this process are copied prior to loading, and mutex used to protect its + * allocation. + */ + +static WCHAR *dllDirectoryName = NULL; +static Tcl_Mutex dllDirectoryNameMutex; + +/* + * Static functions defined within this file. + */ + +static void * FindSymbol(Tcl_Interp *interp, + Tcl_LoadHandle loadHandle, const char *symbol); +static int InitDLLDirectoryName(void); +static void UnloadFile(Tcl_LoadHandle loadHandle); /* *---------------------------------------------------------------------- @@ -45,8 +62,9 @@ TclpDlopen( * function which should be used for this * file. */ { - HINSTANCE handle; - CONST TCHAR *nativeName; + HINSTANCE hInstance; + const TCHAR *nativeName; + Tcl_LoadHandle handlePtr; /* * First try the full path the user gave us. This is particularly @@ -55,9 +73,8 @@ TclpDlopen( */ nativeName = Tcl_FSGetNativePath(pathPtr); - handle = (*tclWinProcs->loadLibraryExProc)(nativeName, NULL, - LOAD_WITH_ALTERED_SEARCH_PATH); - if (handle == NULL) { + hInstance = LoadLibraryEx(nativeName,NULL,LOAD_WITH_ALTERED_SEARCH_PATH); + if (hInstance == NULL) { /* * Let the OS loader examine the binary search path for whatever * string the user gave us which hopefully refers to a file on the @@ -65,36 +82,16 @@ TclpDlopen( */ Tcl_DString ds; - char *fileName = Tcl_GetString(pathPtr); - nativeName = Tcl_WinUtfToTChar(fileName, -1, &ds); - handle = (*tclWinProcs->loadLibraryExProc)(nativeName, NULL, + nativeName = Tcl_WinUtfToTChar(Tcl_GetString(pathPtr), -1, &ds); + hInstance = LoadLibraryEx(nativeName, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); Tcl_DStringFree(&ds); } - *loadHandle = (Tcl_LoadHandle) handle; - - if (handle == NULL) { + if (hInstance == NULL) { DWORD lastError = GetLastError(); -#if 0 - /* - * It would be ideal if the FormatMessage stuff worked better, but - * unfortunately it doesn't seem to want to... - */ - - LPTSTR lpMsgBuf; - char *buf; - int size; - - size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | - FORMAT_MESSAGE_ALLOCATE_BUFFER, NULL, lastError, 0, - (LPTSTR) &lpMsgBuf, 0, NULL); - buf = (char *) ckalloc((unsigned) TCL_INTEGER_SPACE + size + 1); - sprintf(buf, "%d %s", lastError, (char *)lpMsgBuf); -#endif - Tcl_AppendResult(interp, "couldn't load library \"", Tcl_GetString(pathPtr), "\": ", NULL); @@ -107,20 +104,27 @@ TclpDlopen( switch (lastError) { case ERROR_MOD_NOT_FOUND: + Tcl_SetErrorCode(interp, "WIN_LOAD", "MOD_NOT_FOUND", NULL); + goto notFoundMsg; case ERROR_DLL_NOT_FOUND: + Tcl_SetErrorCode(interp, "WIN_LOAD", "DLL_NOT_FOUND", NULL); + notFoundMsg: Tcl_AppendResult(interp, "this library or a dependent library" " could not be found in library path", NULL); break; case ERROR_PROC_NOT_FOUND: + Tcl_SetErrorCode(interp, "WIN_LOAD", "PROC_NOT_FOUND", NULL); Tcl_AppendResult(interp, "A function specified in the import" " table could not be resolved by the system. Windows" " is not telling which one, I'm sorry.", NULL); break; case ERROR_INVALID_DLL: + Tcl_SetErrorCode(interp, "WIN_LOAD", "INVALID_DLL", NULL); Tcl_AppendResult(interp, "this library or a dependent library" " is damaged", NULL); break; case ERROR_DLL_INIT_FAILED: + Tcl_SetErrorCode(interp, "WIN_LOAD", "DLL_INIT_FAILED", NULL); Tcl_AppendResult(interp, "the library initialization" " routine failed", NULL); break; @@ -129,16 +133,25 @@ TclpDlopen( Tcl_AppendResult(interp, Tcl_PosixError(interp), NULL); } return TCL_ERROR; - } else { - *unloadProcPtr = &TclpUnloadFile; } + + /* + * Succeded; package everything up for Tcl. + */ + + handlePtr = ckalloc(sizeof(struct Tcl_LoadHandle_)); + handlePtr->clientData = (ClientData) hInstance; + handlePtr->findSymbolProcPtr = &FindSymbol; + handlePtr->unloadFileProcPtr = &UnloadFile; + *loadHandle = handlePtr; + *unloadProcPtr = &UnloadFile; return TCL_OK; } /* *---------------------------------------------------------------------- * - * TclpFindSymbol -- + * FindSymbol -- * * Looks up a symbol, by name, through a handle associated with a * previously loaded piece of code (shared library). @@ -151,37 +164,42 @@ TclpDlopen( *---------------------------------------------------------------------- */ -Tcl_PackageInitProc * -TclpFindSymbol( +static void * +FindSymbol( Tcl_Interp *interp, Tcl_LoadHandle loadHandle, - CONST char *symbol) + const char *symbol) { + HINSTANCE hInstance = (HINSTANCE) loadHandle->clientData; Tcl_PackageInitProc *proc = NULL; - HINSTANCE handle = (HINSTANCE)loadHandle; /* * For each symbol, check for both Symbol and _Symbol, since Borland * generates C symbols with a leading '_' by default. */ - proc = (Tcl_PackageInitProc *) GetProcAddress(handle, symbol); + proc = (void *) GetProcAddress(hInstance, symbol); if (proc == NULL) { Tcl_DString ds; + const char *sym2; Tcl_DStringInit(&ds); - Tcl_DStringAppend(&ds, "_", 1); - symbol = Tcl_DStringAppend(&ds, symbol, -1); - proc = (Tcl_PackageInitProc *) GetProcAddress(handle, symbol); + TclDStringAppendLiteral(&ds, "_"); + sym2 = Tcl_DStringAppend(&ds, symbol, -1); + proc = (Tcl_PackageInitProc *) GetProcAddress(hInstance, sym2); Tcl_DStringFree(&ds); } + if (proc == NULL && interp != NULL) { + Tcl_AppendResult(interp, "cannot find symbol \"", symbol, "\"", NULL); + Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL); + } return proc; } /* *---------------------------------------------------------------------- * - * TclpUnloadFile -- + * UnloadFile -- * * Unloads a dynamically loaded binary code file from memory. Code * pointers in the formerly loaded file are no longer valid after calling @@ -196,16 +214,16 @@ TclpFindSymbol( *---------------------------------------------------------------------- */ -void -TclpUnloadFile( +static void +UnloadFile( Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to * TclpDlopen(). The loadHandle is a token * that represents the loaded file. */ { - HINSTANCE handle; + HINSTANCE hInstance = (HINSTANCE) loadHandle->clientData; - handle = (HINSTANCE) loadHandle; - FreeLibrary(handle); + FreeLibrary(hInstance); + ckfree(loadHandle); } /* @@ -230,7 +248,7 @@ TclpUnloadFile( int TclGuessPackageName( - CONST char *fileName, /* Name of file containing package (already + const char *fileName, /* Name of file containing package (already * translated to local form if needed). */ Tcl_DString *bufPtr) /* Initialized empty dstring. Append package * name to this if possible. */ @@ -239,6 +257,138 @@ TclGuessPackageName( } /* + *---------------------------------------------------------------------- + * + * TclpTempFileNameForLibrary -- + * + * Constructs a temporary file name for loading a shared object (DLL). + * + * Results: + * Returns the constructed file name. + * + * On Windows, a DLL is identified by the final component of its path name. + * Cross linking among DLL's (and hence, preloading) will not work unless this + * name is preserved when copying a DLL from a VFS to a temp file for + * preloading. For this reason, all DLLs in a given process are copied to a + * temp directory, and their names are preserved. + * + *---------------------------------------------------------------------- + */ + +Tcl_Obj * +TclpTempFileNameForLibrary( + Tcl_Interp *interp, /* Tcl interpreter. */ + Tcl_Obj *path) /* Path name of the DLL in the VFS. */ +{ + Tcl_Obj *fileName; /* Name of the temp file. */ + Tcl_Obj *tail; /* Tail of the source path. */ + + Tcl_MutexLock(&dllDirectoryNameMutex); + if (dllDirectoryName == NULL) { + if (InitDLLDirectoryName() == TCL_ERROR) { + Tcl_AppendResult(interp, "couldn't create temporary directory: ", + Tcl_PosixError(interp), NULL); + Tcl_MutexUnlock(&dllDirectoryNameMutex); + return NULL; + } + } + Tcl_MutexUnlock(&dllDirectoryNameMutex); + + /* + * Now we know where to put temporary DLLs, construct the name. + */ + + fileName = TclpNativeToNormalized(dllDirectoryName); + tail = TclPathPart(interp, path, TCL_PATH_TAIL); + if (tail == NULL) { + Tcl_DecrRefCount(fileName); + return NULL; + } + Tcl_AppendToObj(fileName, "/", 1); + Tcl_AppendObjToObj(fileName, tail); + return fileName; +} + +/* + *---------------------------------------------------------------------- + * + * InitDLLDirectoryName -- + * + * Helper for TclpTempFileNameForLibrary; builds a temporary directory + * that is specific to the current process. Should only be called once + * per process start. Caller must hold dllDirectoryNameMutex. + * + * Results: + * Tcl result code. + * + * Side-effects: + * Creates temp directory. + * Allocates memory pointed to by dllDirectoryName. + * + *---------------------------------------------------------------------- + * [Candidate for process global?] + */ + +static int +InitDLLDirectoryName(void) +{ + size_t nameLen; /* Length of the temp folder name. */ + WCHAR name[MAX_PATH]; /* Path name of the temp folder. */ + DWORD id; /* The process id. */ + DWORD lastError; /* Last error to happen in Win API. */ + int i; + + /* + * Determine the name of the directory to use, and create it. (Keep + * trying with new names until an attempt to create the directory + * succeeds) + */ + + nameLen = GetTempPathW(MAX_PATH, name); + if (nameLen >= MAX_PATH-12) { + Tcl_SetErrno(ENAMETOOLONG); + return TCL_ERROR; + } + + wcscpy(name+nameLen, L"TCLXXXXXXXX"); + nameLen += 11; + + id = GetCurrentProcessId(); + lastError = ERROR_ALREADY_EXISTS; + + for (i=0 ; i<256 ; i++) { + wsprintfW(name+nameLen-8, L"%08x", id); + if (CreateDirectoryW(name, NULL)) { + /* + * Issue: we don't schedule this directory for deletion by anyone. + * Can we ask the OS to do this for us? There appears to be + * potential for using CreateFile (with the flag + * FILE_FLAG_BACKUP_SEMANTICS) and RemoveDirectory to do this... + */ + + goto copyToGlobalBuffer; + } + lastError = GetLastError(); + if (lastError != ERROR_ALREADY_EXISTS) { + break; + } + id *= 16777619; + } + + TclWinConvertError(lastError); + return TCL_ERROR; + + /* + * Store our computed value in the global. + */ + + copyToGlobalBuffer: + dllDirectoryName = ckalloc((nameLen+1) * sizeof(WCHAR)); + wcscpy(dllDirectoryName, name); + return TCL_OK; +} + +/* * Local Variables: * mode: c * c-basic-offset: 4 |