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IBM Developer Domain: Porting OS/2 Applications to Linux (in C)

Mar 14, 2002, 09:00 (3 Talkback[s])
(Other stories by Keith Bowkett)

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"When the decision was made to port the OS/2 version of LANDP to Linux, the team already had experience in porting from OS/2 to NT. The NT port contains two main approaches:

  • "A mapping layer
  • "An abstraction layer

"The abstraction layer is a little less complex than the mapping layer. The abstraction layer is a thin layer of software abstraction that abstracts function names, parameters, and their return codes, whereas the mapping layer attempts to mimic the behaviour of OS/2.

"For the Linux port, we began by developing an abstraction layer. It became apparent early on that the layer would require a lot of additional function. The abstraction layer evolved into a mapping layer. The mapping layer is a shared object that has an interface exactly like the OS/2 interface and tries to mimic the exact behaviour of OS/2. However, LANDP requires only a subset of the OS/2 functionality and therefore the mapping layer is not a full implementation..."

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