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Re: Possible unsafe use of strncat in sbin/sysctl/sysctl.c
On 8/23/11 6:22 PM, Marc Balmer wrote:
Am 24.08.11 00:08, schrieb Joerg Sonnenberger:
On Tue, Aug 23, 2011 at 09:58:53PM +0000, David Holland wrote:
On Tue, Aug 23, 2011 at 11:52:11PM +0200, Marc Balmer wrote:
> (void)wait! That was a pure personal remark. I really don't know where
> that (void)bla idiom comes from, and I obviously don't (void)like it.
It's an artifact of our stupid lint(1).
Not really, it is used by other analyzers to mean "yes, I know this
returns something, but I don't care". The major exception of course is
that GCC broke it for the attributed usage -- half of the pain of
dealing with modern glibc in this regard.
But that is kind of, well, unneeded. A compiler can detect that I don't
use the return value by seeing that I don't use the return value.
What GCC/glibc did is enforce the checking of unused values from most
libc/syscall functions. Putting (void) in front of these calls does not
shut the warnings up.
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