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DragonFly bugs List (threaded) for 2004-10
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Re: cu coredumps

To: Timour Ezeev <timour@xxxxxxxxxxxxxxxxxxx>
From: Mark Cullen <mark.cullen@xxxxxxxxxxxxx>
Date: Wed, 27 Oct 2004 18:01:46 +0100

Timour Ezeev wrote:
 	You got the first case AFAIK, but for the second case you are loosing cp
 	when you assign it to tmp_cp. The possible solutions are:

Yeah, I didn't quite understand the second case. I was thinking that because cp is just a local variable which holds the /dev/cuaa1 part (for example) out of name (or atleast I think that's what it's doing), then it wouldn't matter too much if I lost what was previously in cp?

1. Create new temp holder (in else) for cp and free() it after assignment or 2. If you dont want to create a new pointer, swap pointers in plase, like this

 	(int)tmp_cp ^= (int)cp; (int)cp ^= (int)tmp_cp; (int)tmp_cp ^= (int)cp;

Pointers and dynamic memory allocation stuff still confuses me a bit, which isn't much of a suprise considering I have only had 4 weeks of C programming stuff at University, then they moved onto Matlab :(

What does the ^= mean in the above?

or something similar :)


Thanks for your help!

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