this post was submitted on 21 Oct 2024
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    346
    Theoretical physicists: Actually... (sh.itjust.works)
    submitted 2 weeks ago by [email protected] to c/[email protected]
    32 comments fedilink hide all child comments
     
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    [–] [email protected] 15 points 2 weeks 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] 20 points 2 weeks 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] 16 points 2 weeks ago (1 children)

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

    [–] [email protected] 16 points 2 weeks 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 2 weeks ago (1 children)

    Could've at least say thank you...

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

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

    [–] [email protected] 2 points 2 weeks 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 2 weeks 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 2 weeks ago* (last edited 2 weeks 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.