if (argc != 3) {
	    Tcl_AppendResult(interp, "wrong # arguments: should be \"",
		    argv[0], " counts index\"", NULL);
	    return TCL_ERROR;
	}
	sprintf(buf, "%d %d", pipePtr->readCount, pipePtr->writeCount);
	Tcl_SetResult(interp, buf, TCL_VOLATILE);
	Tcl_AppendResult(interp, buf, NULL);
    } else if (strcmp(argv[1], "create") == 0) {
	if (argc != 5) {
	    Tcl_AppendResult(interp, "wrong # arguments: should be \"",
		    argv[0], " create index readMode writeMode\"", NULL);
	    return TCL_ERROR;
	}
	if (pipePtr->readFile == NULL) {
	    if (!TclpCreatePipe(&pipePtr->readFile, &pipePtr->writeFile)) {
		Tcl_AppendResult(interp, "couldn't open pipe: ",
			Tcl_PosixError(interp), NULL);
		return TCL_ERROR;
	    }
#ifdef O_NONBLOCK
	    fcntl(GetFd(pipePtr->readFile), F_SETFL, O_NONBLOCK);
	    fcntl(GetFd(pipePtr->writeFile), F_SETFL, O_NONBLOCK);
#else
	    Tcl_SetResult(interp, "can't make pipes non-blocking",
		    TCL_STATIC);
	    Tcl_AppendResult(interp, "can't make pipes non-blocking",
		    NULL);
	    return TCL_ERROR;
#endif
	}
	pipePtr->readCount = 0;
	pipePtr->writeCount = 0;

	if (strcmp(argv[3], "readable") == 0) {

	    Tcl_AppendResult(interp, "wrong # arguments: should be \"",
		    argv[0], " fillpartial index\"", NULL);
	    return TCL_ERROR;
	}

	memset(buffer, 'b', 10);
	TclFormatInt(buf, write(GetFd(pipePtr->writeFile), buffer, 10));
	Tcl_SetResult(interp, buf, TCL_VOLATILE);
	Tcl_AppendResult(interp, buf, NULL);
    } else if (strcmp(argv[1], "oneevent") == 0) {
	Tcl_DoOneEvent(TCL_FILE_EVENTS|TCL_DONT_WAIT);
    } else if (strcmp(argv[1], "wait") == 0) {
	if (argc != 5) {
	    Tcl_AppendResult(interp, "wrong # arguments: should be \"",
		    argv[0], " wait index readable|writable timeout\"", NULL);
	    return TCL_ERROR;

	Tcl_AppendResult(interp, "bad argument \"", argv[2],
		"\": must be readable, writable, or both", NULL);
	return TCL_ERROR;
    }
    if (Tcl_GetChannelHandle(channel,
	    (mask & TCL_READABLE) ? TCL_READABLE : TCL_WRITABLE,
	    (ClientData*) &data) != TCL_OK) {
	Tcl_SetResult(interp, "couldn't get channel file", TCL_STATIC);
	Tcl_AppendResult(interp, "couldn't get channel file", NULL);
	return TCL_ERROR;
    }
    fd = PTR2INT(data);
    if (Tcl_GetInt(interp, argv[3], &timeout) != TCL_OK) {
	return TCL_ERROR;
    }
    result = TclUnixWaitForFile(fd, mask, timeout);