Re: [Bug-wget] Race condition on downloaded files among multiple wget instances

[Ángel González]

On 04/09/13 09:38, Tim Ruehsen wrote:
> Very well, if this would be possible. Right now I have no idea how to print
> something like the above. I made Tomas Hozza's test with valgrind and wget
> having debug info. I got 18x (out of 20x) SIGBUS, but on completely different
> places in the code. Within the misuse test situation, SIGBUS could occur at
> any place where memory access (read or write) allocated by wget_read_file().
> Absolutely randomly / unpredictable if an outside process changes the file
> size and/or content at the same time.
>
> And SIGBUS could also occur out of any other reason (e.g. real bugs in Wget).
Yes, that would be a bit hard.
I suspect it could be possible (on some systems) by setting the handler 
with SA_SIGINFO
and checking whether the si_addr member of the siginfo_t argument falls 
inside the
memory area we allocated for a file.
Probably not worth the code complexity. :)