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C operations on opened files

The Question is:

  I can't find this anywhere:  How can I open a file from a
C program and _then_ find out whether it's fixed-length
record or variable-length, or anything else about the
characteristics.  The docs all tell me how to create a file
with these characteristics, but what if I don't know them in
advance?  I know how to create a struct FAB and initialize
it, but how do I initialize it with the information from
pertaining to a given file?  TIA!

The Answer is:

C operations on opened files
  I can't find this anywhere:  How can I open a file from a
C program and _then_ find out whether it's fixed-length
record or variable-length, or anything else about the
characteristics.  The docs all tell me how to create a file
with these characteristics, but what if I don't know them in
advance?  I know how to create a struct FAB and initialize
it, but how do I initialize it with the information from
pertaining to a given file?  TIA!