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Re: rfc: fcntl() error reporting

On Fri, Aug 22, 2008 at 08:06:15PM +0300, Andy Shevchenko wrote:
 > > Your test program exhibits undefined behavior because it asks the
 > > kernel to dereference an invalid pointer. EFAULT is therefore a
 > > perfectly legitimate result.
 > For what function?


 > I could agree if the called function is <a function with a pointer as
 > main arg>, f.e.
 > (I think the main argument for fcntl() may be file descriptor, or FD
 > and command pair.)

What's a "main argument"?

 > > (Although I'd argue that the process should also receive SIGSEGV.)
 > As you see no crash was there.

Yes, but it did return EFAULT.

Whether returning EFAULT should also post SIGSEGV is a separate
question, and also one that tends to lead to flamewars.

David A. Holland

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