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Theoretical physicists: Actually... (sh.itjust.works)

submitted 1 month ago by [email protected] to c/[email protected]

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[–] [email protected] 14 points 1 month ago (3 children)

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

[–] [email protected] 19 points 1 month ago (1 children)

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;
}

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

So it's basically doing nothing and lying about it. 😆

[–] [email protected] 16 points 1 month ago (1 children)

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

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

Could've at least say thank you...

[–] [email protected] 2 points 1 month ago (1 children)

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

[–] [email protected] 2 points 1 month ago

Yeah, that could actually be fun to be honest, lol 😂. But I just know the PR would be rejected, lol 😂.

[–] [email protected] 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.

[–] [email protected] 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.