I moved the member variable from private to public because I thought gdb 
needed it to be public in order to watch it. That's why I found out that 
simply making it public would make the issue disappear.

Now I tried watching it with gdb without making it public: it still gets 
damaged, but gdb does not catch its change...

(gdb) p pic.fd
$3 = 29541

On 01/01/2015 06:56 PM, David Goldsmith wrote:
> Using gdb you can put a watch on a variable or memory location. As soon
> as it changes the program will break and you can look at what the last
> instruction was. It probably won't seem to have anything to do with the
> fd itself, probably an array or something that's getting overwritten.
> I'd link to the relevant page on how to do this but my internet is out
> and I'm responding on my phone right now.

-- 
João M. S. Silva

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