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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Mateusz Viste Newsgroups: comp.lang.c Subject: Re: Memory protection between compilation units? Date: Fri, 13 Jun 2025 08:59:27 +0200 Organization: ... Lines: 31 Message-ID: <20250613085927.7b7cb344@mateusz> References: <20250611153239.6bc43323@mateusz> <86wm9hp0u2.fsf@linuxsc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Injection-Date: Fri, 13 Jun 2025 08:59:27 +0200 (CEST) Injection-Info: dont-email.me; posting-host="be0ae288ae1b46b70a4e7a2b5ac6f308"; logging-data="3444324"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+oJCWwDgaEPnsiPwHz5xq3" Cancel-Lock: sha1:2/Hi2PcL84w+Au5CQPQZXYO/4NA= X-Newsreader: Claws Mail 4.2.0 (GTK 3.24.43; x86_64-suse-linux-gnu) On Thu, 12 Jun 2025 06:05 Tim Rentsch wrote: > The code in question shows several classic error patterns. In no > particular order: > > * buffer overflow > * off-by-one error I'd consider that one item, since one leads to another. > * bitwise operator with signed operand My mistake. Real code is acting on something else than an int, I wasn't paying enough attention when writing the illustrative example. > * using & to effect what is really a modulo operation You think of it as modulo, I think of it as "bits trimming". Essentially same operation, but different viewpoints I guess. > I acknowledge that this response isn't exactly an answer to the > original question. It does illustrate though a kind of thinking > that can be useful when trying to track down hard-to-find bugs. Thank you for your insightful remarks. I completely agree - the best way to debug a program is to avoid the need for debugging in the first place. :-) But working with a large, 15-year-old codebase that has seen contributions from dozens of programmers makes things a bit non-ideal sometimes. Mateusz