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    int Ns_TclGetOpenFd (
    Tcl_Interp* , 
    char* chanId, 
    int write, 
    int* fdPtr
    );
This function returns an open Unix file descriptor for the specified channel. The value at fdPtr is updated with a valid Unix file descriptor.
The write parameter specifies if a writable (TRUE) or readable (FALSE) channel is being requested. See the Tcl 7.6 documentation for Tcl_GetChannelFile. 
This function returns TCL_ERROR or TCL_OK.