Command: createFH

  createFH fileId [mask procedure]

• The fileId is what you receive from open when opening a file or a pipe.
• The mask defines, when the filehandler should be invoked. It is a string build up out of the following letters:
  • r fileId is readable
  • w the fileId is writable
  • e an exception happened on fileId (e.g. the pipe broke).
• The PinK procedure will be called when the condition defined by mask becomes true. The procedure will receive two arguments, the fileId and a mask (coded with the letters as defined above) giving the current condition:

  <procedure> fileId mask
  

  If this argument is omitted the call back mechanism for the given fileId is stopped.

• Return value: The previous setting of a filehandler for this fileID

See also:

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