linuxaudio.org

> Pardon the newb question, but why does: ...

This is a fairly simple C mistake.

In A, &pos refers to valid chunk of memory, thus when

jack_transport_query operates on it, it has a valid piece of memory to

work with.

In B, pos (IIRC) would be initialized to NULL as it is in the file scope.

So when you call jack_transport_query, you have provided a pointer to

NULL, where any memory access will be invalid.
If you set pos in B to be a pointer to a valid object (chunk of

memory) then it should work fine (ie refer to a global object or an

object allocated on the heap with malloc or friends).
--Mark

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