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Me working with the OS (lemmy.world)

submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]

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This happend to me right noww as I tried to write a gui task manager for the GNU/Linux OS

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[–] [email protected] 15 points 3 months ago (1 children)

it didn't crash the kernel, it just killed every process that isn't run by the root user, which kind of feels like a crash

[–] [email protected] 4 points 3 months ago (1 children)

Ah, that definitely would feel like a crash. Sent kill signal to cgroup accidentally? Or just iterate over all processes and signal them all?

[–] [email protected] 6 points 3 months ago* (last edited 3 months ago) (2 children)

probably the later, but idk how, all I did was insert a string in the following command like this:

``Command::new("bash")

.arg("-c") .arg(format!("ps -aux | grep -i "{}" | awk '{{print $2}}' | xagrs kill -9", input)

.output()

.expect("error");``

I've tested the command and it worked flawlessly in the terminal, but I have no idea what I'm doing, since I'm new to rust and never worked with this library

[–] [email protected] 6 points 3 months ago (1 children)

There are rust libraries to send signals, might be better to use those rather than calling bash. eg. https://docs.rs/nix/latest/nix/sys/signal/index.html

I'm guessing if input was "", then it would sigkill all processes? Less confident, but some functions behave slightly differently in an interactive console vs a non interactive, maybe ps has a different format when used non interactively?

Aside, you want three backticks and a newline to get code formatting :)

[–] [email protected] 5 points 3 months ago* (last edited 3 months ago)

thx, btw I figured it out:

I forgot to trimm the string, so it had a line break in it which lead to grep showing the processes from the term I put in + all processes that contain a space/linebreak and appearently all processes shown by ps aux contain some kind of space (makes sense, since there are spaces between the user, pid, etc) so yeah, I ended up trying to kill every process on the system, but it only killed the user processes, since I ran everything without sudo