When I run it from my default shell, zsh, I get this:

4 % ./segv
zsh: 13512 segmentation fault ./segv

When I run it from bash, I get what you noted in your question:

bediger@flq123:csrc % ./segv
Segmentation fault
#zsh #bash
#Unix signal mechanism is entirely different from the CPU-specific events that start the process.

In general, when a bad address is accessed (or written to a read-only area, attempt to execute a non-executable section, etc.), the CPU will generate some CPU-specific event (on traditional non-VM architectures this was called a segmentation violation, since each "segment" (traditionally, the read-only executable "text", the writable and variable-length "data", and the stack traditionally at the opposite end of memory) had a fixed range of addresses - on a modern architecture it's more likely to be a page fault [for unmapped memory] or an access violation [for read, write, and execute permission issues], and I'll focus on this for the rest of the answer).

Now, at this point, the kernel can do several things. Page faults are also generated for memory that is valid but not loaded (e.g. swapped out, or in a mmapped file, etc.), and in this case the kernel will map the memory and then restart the user program from the instruction that caused the error. Otherwise, it sends a signal. This doesn't exactly "direct [the original event] to the offending program", since the process for installing a signal handler is different and mostly architecture-independent, vs. if the program were expected to simulate installing an interrupt handler.
https://unix.stackexchange.com/questions/257598/how-does-a-segmentation-fault-work-under-the-hood

How #Unix Spell Ran in 64kB RAM

https://blog.codingconfessions.com/p/how-unix-spell-ran-in-64kb-ram

What operating systems do you use?

This includes on your PC/computer and mobile devices, or anywhere else for that matter. Select all that apply!

Please BOOST for maximum exposure to the #Fediverse

If your choice isn't listed, simply comment and let's discuss things!

#Poll #Polls #POTD #Question #Questions #QOTD #Windows #MacOS #Linux #Unix #ChromeOS #iOS #Android #Tech #Technology #AllThingsTech

The rsync utility in Linux, *BSD, and Unix-like systems are vulnerable to multiple security issues, including arbitrary code execution, arbitrary file upload, information disclosure, and privilege escalation. Hence, you must patch the system ASAP https://www.cyberciti.biz/linux-news/cve-2024-12084-rsyn-security-urgent-update-needed-on-unix-bsd-systems/

#infosec #security #linux #unix

Alt...

A critical vulnerability (CVE-2024-12084 and five others) requires immediate patching on Linux, *BSD, macOS, and Unix-like systems to protect your systems from attacks. Update Rsync now!

OTD 1973: #UNIX seminar at Bell Labs. pdf: https://drive.google.com/file/d/1HAISQ_LTJTBRGtKbIsrsIAM54k8Zub22/view?usp=sharing

Alt...

Internal Bell Labs memo announcing a UNIX Users Seminanr on January 15, 1973. Many illustrious names mentioned. Sorry, OCR didn't work for me.

https://github.com/ibara/oksh

#RunBSD #Unix

Happy birthday bash!

#linux #gnu #unix #bash

Alt...

This screenshot shows the bash shell source code being downloaded using the wget command. The grep command then displays its birthday, which is January 10th, 1988. Bash was originally created by Brian Fox.

Now installing GhostBSD. FreeBSD with a desktop.

Pretty cool. I'm interested.

I also might try an Indie Archive install with FreeBSD and no desktop. Midnight Commander to the rescue.

I'm curious if FreeBSD will require the coreutils install to get gnu cp (gcp).

#BSD #FreeBSD #GhostBSD #Unix

What is your favorite new #Linux or #Unix command that you discovered this past year? Add it below 👇

BSDCan 2025 Call for Papers is open, see https://www.bsdcan.org/2025/papers.html

Important dates

Submission deadline 2025-02-12
Accept notified by 2025-03-04

Tutorials 2025-06-11 - 2025-06-12
Conference 2025-06-13 - 2025-06-14

#bsdcan #freebsd #openbsd #netbsd #bsd #unix #conference #development #freesoftware #libresoftware

Plan 9 is a Unix-like operating system first developed by Bell Labs.

https://comp.os.plan9.narkive.com/SnexHy94/we-re-alive-again

"comp.os.plan9 is a moderated newsgroup for discussion of the Plan 9 operating system and related systems. It's a forum to ask questions and share information about installing, administering, using, and developing the system. Discussion of the original Plan 9 from Bell Labs as well as all forks, derivitives, or otherwise related systems are on topic. "

http://9srv.net/comp.os.plan9/index.html

@opensource@lemmy.ml @usenet@lemmy.ml

#Plan9 #Usenet #Newsgroups #Unix #OS #OperatingSystem

My stock answer to all the oh-so-tired "how to exit vim(1)" schtick includes ref to https://nxdomain.no/~peter/ed_mastery_is_a_must_for_real_unix_person.html (alternatively https://bsdly.blogspot.com/2018/04/ed1-mastery-is-must-for-real-unix-person.html if you really don't mind being tracked) #vi #vim #howtoexitvim #ed #editors #standardeditor #unix #oldfart #greybeard

You're a #Unix / #Linux fan and looking for a simple and minimalistic #blog engine?

#manpageblog might be your solution and comes in a simple and familiar manpage design without big dependencies as a static blog generator.

You can find more about manpageblog right here: https://github.com/gyptazy/manpageblog

#opensource #alternatives #wordpress #blogging #python #sitegenerator #bsd #minimalism #minimalistic #fediverse #tech

Oh man I'm confused now and yes it's easily done. 🤣
On my laptop I'm running #FreeBSD quarterly binaries but some are suggesting that I should switch to the latest binaries branch. Is that wise ? I thought it was best to stay on quarterly ??
#RunBSD #Unix

dating culture clash

#9front #openbsd #gnu #linux #plan9 #dating #comic #unix

Alt...

plan9bunny-person meets with a fish-daemon-person. Daemon: "So, how was the date?" Bunny: "He talked about docker for 35 minutes and then asked, if I have wine." Daemon: "Did you tell him you're not Unix?" Bunny: "Yeah, he said: 'oh, like GNU?'"