#define WIN_FILE	3	/* Basic Win32 file. */

/*
 * This structure encapsulates the common state associated with all file types
 * used in a pipeline.
 */

typedef struct WinFile {
    int type;			/* One of the file types defined above. */
    HANDLE handle;		/* Open file handle. */
} WinFile;

/*
 * This list is used to map from pids to process handles.
 */

				 * readable object.  */
    char extraByte;		/* Buffer for extra character consumed by
				 * reader thread. This byte is shared with the
				 * reader thread so access must be
				 * synchronized with the readable object. */
} PipeInfo;

typedef struct ThreadSpecificData {
    /*
     * The following pointer refers to the head of the list of pipes that are
     * being watched for file events.
     */

    PipeInfo *firstPipePtr;
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

/*
 * The following structure is what is added to the Tcl event queue when pipe
 * events are generated.
 */

typedef struct PipeEvent {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    PipeInfo *infoPtr;		/* Pointer to pipe info structure. Note that
				 * we still have to verify that the pipe
				 * exists before dereferencing this
				 * pointer. */
} PipeEvent;

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?channelId?");
	return TCL_ERROR;
    }
    if (objc == 1) {
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((unsigned) getpid()));
    } else {
	chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], NULL),
		NULL);
	if (chan == (Tcl_Channel) NULL) {
	    return TCL_ERROR;
	}
	chanTypePtr = Tcl_GetChannelType(chan);
	if (chanTypePtr != &pipeChannelType) {
	    return TCL_OK;

    namePtr = (char *) name;
    length = GetTempPath(MAX_PATH, name);
    if (length == 0) {
	goto gotError;
    }
    namePtr += length * sizeof(TCHAR);
    if (basenameObj) {
	const char *string = Tcl_GetStringFromObj(basenameObj, &length);

	Tcl_WinUtfToTChar(string, length, &buf);
	memcpy(namePtr, Tcl_DStringValue(&buf), Tcl_DStringLength(&buf));
	namePtr += Tcl_DStringLength(&buf);
	Tcl_DStringFree(&buf);
    } else {
	const TCHAR *baseStr = TEXT("TCL");
	int length = 3 * sizeof(TCHAR);