Docs » Autodocs » exec.library » SetFunction
SetFunction -- change a function vector in a library
oldFunc = SetFunction(library, funcOffset, funcEntry)
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APTR SetFunction(struct Library *,LONG,APTR);
SetFunction is a functional way of changing where vectors in a
library point. They are changed in such a way that the
checksumming process will never falsely declare a library to be
invalid.
If you use SetFunction on a function that can be called from
interrupts, you are obligated to provide your own arbitration.
SetFunction cannot be used on non-standard libraries like pre-V36
dos.library. Here you must manually Forbid(), preserve all 6
original bytes, set the new vector, SumLibrary(), then Permit().
library - a pointer to the library to be changed
funcOffset - the offset of the function to be replaced
funcEntry - pointer to new function
oldFunc - pointer to the old function that was just replaced
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