if (tsdPtr->cwdPathPtr == *pathPtrPtr) {
	return 1;
    } else {
	int len1, len2;
	const char *str1, *str2;

	str1 = Tcl_GetStringFromObj(tsdPtr->cwdPathPtr, &len1);
	str2 = Tcl_GetStringFromObj(*pathPtrPtr, &len2);
	if ((len1 == len2) && !memcmp(str1, str2, len1)) {
	    /*
	     * They are equal, but different objects. Update so they will be
	     * the same object in the future.
	     */

	    Tcl_DecrRefCount(*pathPtrPtr);

    ClientData clientData)
{
    int len;
    const char *str = NULL;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);

    if (cwdObj != NULL) {
	str = Tcl_GetStringFromObj(cwdObj, &len);
    }

    Tcl_MutexLock(&cwdMutex);
    if (cwdPathPtr != NULL) {
	Tcl_DecrRefCount(cwdPathPtr);
    }
    if (cwdClientData != NULL) {

	     * i.e. the representation which is relative to pathPtr.
	     */

	    norm = Tcl_FSGetNormalizedPath(NULL, pathPtr);
	    if (norm != NULL) {
		const char *path, *mount;

		mount = Tcl_GetStringFromObj(mElt, &mlen);
		path = Tcl_GetStringFromObj(norm, &len);
		if (path[len-1] == '/') {
		    /*
		     * Deal with the root of the volume.
		     */

		    len--;
		}

	return result;
    }

    if (Tcl_FSStat(pathPtr, &statBuf) == -1) {
	Tcl_SetErrno(errno);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return result;
    }
    chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644);
    if (chan == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return result;
    }

    /*
     * The eofchar is \32 (^Z). This is the usual on Windows, but we effect
     * this cross-platform to allow for scripted documents. [Bug: 2040]
     */

     * be handled especially.
     */

    if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	goto end;
    }
    string = Tcl_GetString(objPtr);

    /*
     * If first character is not a BOM, append the remaining characters,
     * otherwise replace them. [Bug 3466099]
     */

    if (Tcl_ReadChars(chan, objPtr, -1,
	    memcmp(string, "\xEF\xBB\xBF", 3)) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	goto end;
    }

    if (Tcl_Close(interp, chan) != TCL_OK) {
	goto end;
    }

    iPtr = (Interp *) interp;
    oldScriptFile = iPtr->scriptFile;
    iPtr->scriptFile = pathPtr;
    Tcl_IncrRefCount(iPtr->scriptFile);
    string = Tcl_GetStringFromObj(objPtr, &length);

    /*
     * TIP #280 Force the evaluator to open a frame for a sourced file.
     */

    iPtr->evalFlags |= TCL_EVAL_FILE;
    result = TclEvalEx(interp, string, length, 0, 1, NULL, string);

    if (result == TCL_RETURN) {
	result = TclUpdateReturnInfo(iPtr);
    } else if (result == TCL_ERROR) {
	/*
	 * Record information telling where the error occurred.
	 */

	const char *pathString = Tcl_GetStringFromObj(pathPtr, &length);
	int limit = 150;
	int overflow = (length > limit);

	Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
		"\n    (file \"%.*s%s\" line %d)",
		(overflow ? limit : length), pathString,
		(overflow ? "..." : ""), Tcl_GetErrorLine(interp)));

	return TCL_ERROR;
    }

    if (Tcl_FSStat(pathPtr, &statBuf) == -1) {
	Tcl_SetErrno(errno);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }
    chan = Tcl_FSOpenFileChannel(interp, pathPtr, "r", 0644);
    if (chan == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    /*
     * The eofchar is \32 (^Z). This is the usual on Windows, but we effect
     * this cross-platform to allow for scripted documents. [Bug: 2040]
     */

     * be handled especially.
     */

    if (Tcl_ReadChars(chan, objPtr, 1, 0) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;
    }
    string = Tcl_GetString(objPtr);

    /*
     * If first character is not a BOM, append the remaining characters,
     * otherwise replace them. [Bug 3466099]
     */

    if (Tcl_ReadChars(chan, objPtr, -1,
	    memcmp(string, "\xEF\xBB\xBF", 3)) < 0) {
	Tcl_Close(interp, chan);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't read file \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;
    }

    if (Tcl_Close(interp, chan) != TCL_OK) {
	Tcl_DecrRefCount(objPtr);
	return TCL_ERROR;

	result = TclUpdateReturnInfo(iPtr);
    } else if (result == TCL_ERROR) {
	/*
	 * Record information telling where the error occurred.
	 */

	int length;
	const char *pathString = Tcl_GetStringFromObj(pathPtr, &length);
	const int limit = 150;
	int overflow = (length > limit);

	Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
		"\n    (file \"%.*s%s\" line %d)",
		(overflow ? limit : length), pathString,
		(overflow ? "..." : ""), Tcl_GetErrorLine(interp)));

				 * set. */
{
    const char *id, *msg;

    msg = Tcl_ErrnoMsg(errno);
    id = Tcl_ErrnoId();
    if (interp) {
	Tcl_SetErrorCode(interp, "POSIX", id, msg, NULL);
    }
    return msg;
}

/*
 *----------------------------------------------------------------------
 *

	 */

	if (seekFlag && Tcl_Seek(retVal, (Tcl_WideInt) 0, SEEK_END)
		< (Tcl_WideInt) 0) {
	    if (interp != NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not seek to end of file while opening \"%s\": %s",
			Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	    }
	    Tcl_Close(NULL, retVal);
	    return NULL;
	}
	if (binary) {
	    Tcl_SetChannelOption(interp, retVal, "-translation", "binary");
	}
	return retVal;
    }

    /*
     * File doesn't belong to any filesystem that can open it.
     */

    Tcl_SetErrno(ENOENT);
    if (interp != NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"couldn't open \"%s\": %s",
		Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
    }
    return NULL;
}

/*
 *----------------------------------------------------------------------
 *

	     * 'Tcl_FSEqualPaths', and in addition avoid a nasty infinite loop
	     * bug when trying to normalize tsdPtr->cwdPathPtr.
	     */

	    int len1, len2;
	    const char *str1, *str2;

	    str1 = Tcl_GetStringFromObj(tsdPtr->cwdPathPtr, &len1);
	    str2 = Tcl_GetStringFromObj(norm, &len2);
	    if ((len1 == len2) && (strcmp(str1, str2) == 0)) {
		/*
		 * If the paths were equal, we can be more efficient and
		 * retain the old path object which will probably already be
		 * shared. In this case we can simply free the normalized path
		 * we just calculated.
		 */

	 *     http://mooon.googlecode.com/svn/trunk/linux_include/linux/aufs_type.h
	 *     http://aufs.sourceforge.net/
	 * Better reference will be gladly taken.
	 */
#ifndef AUFS_SUPER_MAGIC
#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
#endif /* AUFS_SUPER_MAGIC */
	if ((statfs(Tcl_GetString (shlibFile), &fs) == 0) &&
	    (fs.f_type == AUFS_SUPER_MAGIC)) {
	    return 1;
	}
    }
#endif /* ... NO_FSTATFS */
#endif /* ... TCL_TEMPLOAD_NO_UNLINK */

     * First check if it is readable -- and exists!
     */

    if (Tcl_FSAccess(pathPtr, R_OK) != 0) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "couldn't load library \"%s\": %s",
		    Tcl_GetString(pathPtr), Tcl_PosixError(interp)));
	}
	return TCL_ERROR;
    }

#ifdef TCL_LOAD_FROM_MEMORY
    /*
     * The platform supports loading code from memory, so ask for a buffer of

     */

    if (fsPtr->filesystemSeparatorProc != NULL) {
	Tcl_Obj *sep = fsPtr->filesystemSeparatorProc(pathPtr);

	if (sep != NULL) {
	    Tcl_IncrRefCount(sep);
	    separator = Tcl_GetString(sep)[0];
	    Tcl_DecrRefCount(sep);
	}
    }

    /*
     * Place the drive name as first element of the result list. The drive
     * name may contain strange characters, like colons and multiple forward
     * slashes (for example 'ftp://' is a valid vfs drive name)
     */

    TclNewObj(result);
    p = Tcl_GetString(pathPtr);
    Tcl_ListObjAppendElement(NULL, result,
	    Tcl_NewStringObj(p, driveNameLength));
    p += driveNameLength;

    /*
     * Add the remaining path elements to the list.
     */

    Tcl_Obj **driveNameRef)	/* If the path is absolute, and this is
				 * non-NULL, then set to the name of the
				 * drive, network-volume which contains the
				 * path, already with a refCount for the
				 * caller. */
{
    int pathLen;
    const char *path = Tcl_GetStringFromObj(pathPtr, &pathLen);
    Tcl_PathType type;

    type = TclFSNonnativePathType(path, pathLen, filesystemPtrPtr,
	    driveNameLengthPtr, driveNameRef);

    if (type != TCL_PATH_ABSOLUTE) {
	type = TclpGetNativePathType(pathPtr, driveNameLengthPtr,

		while (numVolumes > 0) {
		    Tcl_Obj *vol;
		    int len;
		    const char *strVol;

		    numVolumes--;
		    Tcl_ListObjIndex(NULL, thisFsVolumes, numVolumes, &vol);
		    strVol = Tcl_GetStringFromObj(vol,&len);
		    if (pathLen < len) {
			continue;
		    }
		    if (strncmp(strVol, path, len) == 0) {
			type = TCL_PATH_ABSOLUTE;
			if (filesystemPtrPtr != NULL) {
			    *filesystemPtrPtr = fsRecPtr->fsPtr;

	if (cwdPtr != NULL) {
	    const char *cwdStr, *normPathStr;
	    int cwdLen, normLen;
	    Tcl_Obj *normPath = Tcl_FSGetNormalizedPath(NULL, pathPtr);

	    if (normPath != NULL) {
		normPathStr = Tcl_GetStringFromObj(normPath, &normLen);
		cwdStr = Tcl_GetStringFromObj(cwdPtr, &cwdLen);
		if ((cwdLen >= normLen) && (strncmp(normPathStr, cwdStr,
			(size_t) normLen) == 0)) {
		    /*
		     * The cwd is inside the directory, so we perform a 'cd
		     * [file dirname $path]'.
		     */