Hacker News: delamon

New comment by delamon in "Framework Laptop 13 Pro"

delamon — Wed, 22 Apr 2026 10:48:28 +0000

Not really. PgUp, PgDown are missing. It is possible to configure software combination that would emulate them. But emulation is emulation.

New comment by delamon in "How does GPS work?"

delamon — Wed, 22 Apr 2026 10:31:14 +0000

This blog post is also worth noting: https://ciechanow.ski/gps/

New comment by delamon in "Claude Code's source code has been leaked via a map file in their NPM registry"

delamon — Tue, 31 Mar 2026 10:06:55 +0000

What is wrong with peeking at process.env? It is a global map, after all. I assume, of course, that they don't mutate it.

New comment by delamon in "CVE-2026-3888: Important Snap Flaw Enables Local Privilege Escalation to Root"

delamon — Wed, 18 Mar 2026 18:15:25 +0000

Rust cannot help you if race condition crosses API boundary. No matter what language you use, you have to think about system as a whole. Failure to do that results in bugs like this

New comment by delamon in "Modernizing swapping: virtual swap spaces"

delamon — Sat, 07 Mar 2026 09:32:17 +0000

You can bump /proc/$firefox_pid/oom_score_adj to make it likely target. The easiest way is to make wrapper script that bumps the score and then starts firefox. All children will inherit the score.

New comment by delamon in "The biggest CRT ever made: Sony's PVM-4300"

delamon — Tue, 23 Dec 2025 07:37:27 +0000

IBM was producing in Japan T221 monitor staring from 2001. It had 3840x2160 LCD screen.

New comment by delamon in "Rust in the kernel is no longer experimental"

delamon — Thu, 11 Dec 2025 10:51:10 +0000

I've been trying to convert to Rust an in-memory database and failed. It is strictly single-threaded and full of intrusive lists. I tried hard to please borrow-checker, but one have little choice when internal structures are full of cycles. The result was ugly mess of Rc all over the place. I guess it is just an example of a problem that doesn't fit Rust well.

This makes me wonder: what performance cost Rust code pay due to inability represent cyclic structures efficiently? It seems people tend to design their data in way to please Rust and not in way that would be otherwise more performance efficient.

New comment by delamon in "Rust in the kernel is no longer experimental"

delamon — Thu, 11 Dec 2025 08:24:26 +0000

Right. So it is not that double-linked lists are inherently unsafe, it is (just) Rust ownership model cannot represent them (any other cyclic structures).

New comment by delamon in "Rust in the kernel is no longer experimental"

delamon — Wed, 10 Dec 2025 14:39:11 +0000

> if your compiler unboxes the contained item into your nodes

Is there known compilers that can do that?

New comment by delamon in "Rust in the kernel is no longer experimental"

delamon — Wed, 10 Dec 2025 14:37:43 +0000

Can you elaborate, what key assumptions about memory safety linked lists break? Sure, double linked lists may have non-trivial ownership, but that doesn't compromise safety.

New comment by delamon in "Rust in the kernel is no longer experimental"

delamon — Wed, 10 Dec 2025 14:35:14 +0000

> Storing the data in nodes doesn't work if the given structure may need to be in multiple linked lists

That is why kernel mostly (always?) uses intrusive linked lists. They have no such problem.

New comment by delamon in "Date bug in Rust-based coreutils affects Ubuntu 25.10 automatic updates"

delamon — Sat, 25 Oct 2025 13:38:30 +0000

Correct. Any language with builtin bounds checking would work.

New comment by delamon in "Date bug in Rust-based coreutils affects Ubuntu 25.10 automatic updates"

delamon — Fri, 24 Oct 2025 09:31:41 +0000

It is worth noting, that all three CVEs could be prevented by simple bounds checking at runtime. Preventing them does not require borrow checker or any other Rust fancy features.

New comment by delamon in "Dumb to managed switch conversion (2010)"

delamon — Wed, 13 Aug 2025 08:17:56 +0000

Sometimes managed switch is the only way to find out faulty cable. I'm speaking about a bit bad cable, which corrupts some data, not all of it. Just by looking on interface error counters you can easily tell if something is off. Without it you either need somehow come up with very expensive cable tester or just pretend that slow network speed is due to some other popular blame destination (e.g. it's just bad macos update) ;)

New comment by delamon in "Pkgbase Removes FreeBSD Base System Feature"

delamon — Wed, 30 Jul 2025 09:18:21 +0000

"immutable" top-level folders won't cut it. In order to recursively delete a folder, rm has to delete leaves first. So, you will endup with empty top-level folders, which is no better.

New comment by delamon in "Zig's New Async I/O"

delamon — Sun, 13 Jul 2025 08:37:17 +0000

> Doing that is an instant performance hit. Not to mention annoying to do.

The cost of virtual dispatch on IO path is almost always negligible. It is literally one conditional vs syscall. I doubt it you can even measure the difference.

New comment by delamon in "Writing into Uninitialized Buffers in Rust"

delamon — Wed, 21 May 2025 07:40:06 +0000

c) SIMD won't be as helpful when you are zeroing small buffers of non-round sizes

New comment by delamon in "Building my own solar power system"

delamon — Wed, 21 May 2025 07:29:36 +0000

Pump it to the storage. Building something like https://www.energyvault.com/products/g-vault-gravity-energy-... is impossible for a home owner. But the country scale energy provider can build such thing.

New comment by delamon in "Zig's new LinkedList API (it's time to learn fieldParentPtr)"

delamon — Wed, 16 Apr 2025 12:48:33 +0000

Dynamic arrays often use doubling as a resize strategy. This means that on average about 25% of capacity is "wasted". Depending on element size and element count it may lead to larger memory usage compared to linked list.

New comment by delamon in "If you get the chance, always run more extra network fiber cabling"

delamon — Thu, 27 Mar 2025 13:46:24 +0000

It is well known that copper 10G runs hot. Use DAC or fiber if you want run cool