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#define __NR_sysfs                139

https://man7.org/linux/man-pages/man2/sysfs.2.html

i don't even know what to put for the tl;dr lol. get filesystem information i guess?

it's a completely obsolete syscall and really shouldn't even exist anymore. it's been superseded entirely by /proc
i mean, just look at this lol
>This string will be written to the buffer pointed to by buf. Make sure that buf has enough space to accept the string.
...
>There is no way to guess how large buf should be.
fucking lmao. thank god no one really supports this anymore. i'm really not sure how useful it would be in the first place, but i guess it had to have had some use in order to get created at all...
we can also discuss https://man7.org/linux/man-pages/man5/proc.5.html if there's interest. this guy is pretty cool

relevant resources:

man man

man syscalls

https://man7.org/linux/man-pages/
https://linux.die.net/man/
https://elixir.bootlin.com/linux/
https://elixir.bootlin.com/musl/
https://elixir.bootlin.com/glibc/