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Theoretical physicists: Actually... (sh.itjust.works)
submitted 1 month ago by 0x4E4F@sh.itjust.works to c/linuxmemes@lemmy.world
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[-] TimeSquirrel@kbin.melroy.org 15 points 1 month ago

Programmatically, what does the kernel actually do with data sent to /dev/null? Put it in a temp buffer and just delete it?

[-] m_f@midwest.social 20 points 1 month ago

I was also curious, here's a good answer:

https://unix.stackexchange.com/questions/670199/how-is-dev-null-implemented

The implementation is:

static ssize_t write_null(struct file *file, const char __user *buf,
              size_t count, loff_t *ppos)
{
    return count;
}
[-] TimeSquirrel@kbin.melroy.org 16 points 1 month ago

So it's basically doing nothing and lying about it. ๐Ÿ˜†

[-] taldennz@lemmy.nz 17 points 1 month ago

"I accepted all of the bytes you gave me. I didn't do anything with them, but I accept you gave them to me".

[-] 0x4E4F@sh.itjust.works 4 points 1 month ago

Could've at least say thank you...

[-] taldennz@lemmy.nz 2 points 1 month ago

It's open source. If manners are an important feature to you perhaps look into contributing... :)

[-] 0x4E4F@sh.itjust.works 2 points 1 month ago

Yeah, that could actually be fun to be honest, lol ๐Ÿ˜‚. But I just know the PR would be rejected, lol ๐Ÿ˜‚.

[-] Flipper@feddit.org 17 points 1 month ago

The syscall to write passes a buffer and length. If it is Dev null the call just returns without doing anything more.

[-] Boxscape@lemmy.sdf.org 6 points 1 month ago* (last edited 1 month ago)

Programmatically, what does the kernel actually do with data sent to /dev/null?

I imagine it's like getting nullified in that olde show ReBoot.

this post was submitted on 21 Oct 2024
346 points (99.4% liked)

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