Segmentation Fault with pointer-to-pointer with C / Linux?

Set **S is not initized, but you dereference S in the next statement.

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C pointers segmentation-fault link|improve this question edited Jan 12 '10 at 2:31Bill the Lizard?82.2k42195370 asked Apr 25 '09 at 22:16Leif Ericson502919 100% accept rate.

Set **S is not initized, but you dereference S in the next statement: *S = whatever Unless you get really, really unlucky and S is pointing to a memory location you can actually access, you're trying to dereference an invalid pointer. You would need to allocate your pointer first: Set **S; S = (S**)calloc(sizeof(S*),1); *S = getpar(); Or, alternatively (and preferable, I think): Set *S; Set **T = &S; S = getpar(); /* whatever else.

1 Thanks a lot! I spent hours on that thing. – Leif Ericson Apr 25 '09 at 22:30.

S is not initialized. Its pointing to nothing (garbage) and then you de-reference it in the next statement.

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