Name

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  FXPREAD

Author

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  Craig B. Markwardt, NASA/GSFC Code 662, Greenbelt, MD 20770
  craigm@lheamail.gsfc.nasa.gov
  UPDATED VERSIONs can be found on my WEB PAGE:
      http://cow.physics.wisc.edu/~craigm/idl/idl.html

Purpose

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  Internal routine to read from a Unix pipe.

Description

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  See the following procedures for appropriate documentation.
    FXGOPEN - open resource
    FXGCLOSE - close resource
    FXGREAD - read from resource
    FXGWRITE - write to resource
    FXGSEEK - seek on resource (i.e., perform POINT_LUN)
    FXGFILTERED - determine if resource is a normal file.

Parameters

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  unit - LUN of the pipe command, *not* the cache file.
  buffer - the buffer to accept the data. Data is read in
            *unformatted*.

Side Effects

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  The pipe is read as needed and the cache is populated.
  The file pointer advances.
  MODIFICATIONS
  Corrected error message, 21 Sep 2000, CM
  Changed copyright notice, 21 Sep 2000, CM