/g/ - syscall of the day: epoll_* - Technology

Anonymous

syscall of the day: epoll_* 05/08/26(Fri)10:14:20 No.108779335

File: GXZ5MVBWgAA4Ugq.jpg (310 KB, 2048x1302)

syscall of the day: epoll_* Anonymous 05/08/26(Fri)10:14:20 No.108779335 Archived

previous: >>108772834
#define __NR_epoll_create            213
#define __NR_epoll_ctl_old            214
#define __NR_epoll_wait_old            215
#define __NR_epoll_wait                232
#define __NR_epoll_ctl                233
#define __NR_epoll_pwait            281
#define __NR_epoll_create1            291
#define __NR_epoll_pwait2    441
https://man7.org/linux/man-pages/man2/epoll_create.2.html
https://man7.org/linux/man-pages/man2/epoll_ctl.2.html
https://man7.org/linux/man-pages/man2/epoll_wait.2.html
https://man7.org/linux/man-pages/man7/epoll.7.html

tl;dr:
monitor file descriptors

not even going to comment on the naming scheme here. it's genuinely beyond parody.

there are so many different fd monitoring/polling implementations... it's interesting. but epoll is genuinely pretty good. a bit complicated, but any decently large software system is going to be. especially when it has to interface with the linux filesystem. the manpage (section 7) for epoll is pretty decent, as well. one of the better written ones. that's always a nice surprise when it happens
what do you think about this feature suite, anon? have you ever had occasion to use it? share with the class

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/

Anonymous
05/08/26(Fri)10:57:55 No.108779591

Anonymous 05/08/26(Fri)10:57:55 No.108779591

bampu

Anonymous
05/08/26(Fri)16:26:03 No.108781522

Anonymous 05/08/26(Fri)16:26:03 No.108781522

now this is a real syscall

Anonymous
05/08/26(Fri)16:29:17 No.108781542

Anonymous 05/08/26(Fri)16:29:17 No.108781542

>>108781522
there are some complementary ways to get other interfaces as file descriptors - timerfd, eventfd, signalfd, procfd... and use them with epoll. makes you wonder why didn't unix use fds for these in the first place

Anonymous
05/08/26(Fri)17:55:30 No.108782035

Anonymous 05/08/26(Fri)17:55:30 No.108782035

>>108781522
how so?

Anonymous
05/08/26(Fri)18:02:44 No.108782071

Anonymous 05/08/26(Fri)18:02:44 No.108782071

Finally, we got a real one.
>what do you think about this feature suite, anon?
It's awesome.
>have you ever had occasion to use it? share with the class
I work in an ancient codebase that really SHOULD be using it, but it uses select instead because it's older than I am and my retarded managers don't care about fixing tech debt.
It's okay though. If someone opens 500 connections, it hits the fd limit and blows up.

Anonymous
05/08/26(Fri)19:35:47 No.108782585

Anonymous 05/08/26(Fri)19:35:47 No.108782585

>>108779335
>no maid
>wagie complaining about hiring practices
Bad thread.

Anonymous
05/08/26(Fri)19:37:29 No.108782590

Anonymous 05/08/26(Fri)19:37:29 No.108782590

>>108782585
Good thread actually. Maidposters need to go back to the shitholes they came from.

Anonymous
05/08/26(Fri)21:09:20 No.108782984

Anonymous 05/08/26(Fri)21:09:20 No.108782984

>>108782590
Maidposters came from here. They're indigenous to 4Chan, especially /g/. You'd know this if you weren't a tourist.

Anonymous
05/08/26(Fri)23:19:42 No.108783522

Anonymous 05/08/26(Fri)23:19:42 No.108783522

>>108782984
that one guy always posting dragon maid gives me the ick