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Open Transport supports two methods of dynamically loading STREAMS modules. A STREAMS module may be written as an Apple Shared Library Manager (ASLM) shared library or as a Code Fragment Manager (CFM) code fragment. STREAMS modules written for 68000-family processors must use the ASLM. The CFM is the preferred mechanism for PowerPC modules, but the ASLM may also be used, especially if the module loads C++ classes dynamically.
In this chapter, whenever a STREAMS module or driver is described as exporting a function it means that it exports the function using the named export method of the appropriate DLL. For the ASLM, this means using the extern keyword in front of the name of the function in the export file. For the CFM, this means using the -export switch in MPW when linking a shared library.
IMPORTANT
PCI card port drivers for Power Macintosh computers must be written to conform to the new native driver architecture, using the CFM only. Open Transport will get all of the information it needs from the Macintosh Name Registry, described in Chapter 10.