Re: [PATCH 1/2] sysctl: read() must consume poll events, not poll()

Lennart Poettering
2022-05-02T15:43:31Z

On Mo, 02.05.22 17:30, Jason A. Donenfeld (Jason@zx2c4.com) wrote:

> Just wanted to double check with you that this change wouldn't break how
> you're using it in systemd for /proc/sys/kernel/hostname:
>
> https://github.com/systemd/systemd/blob/39cd62c30c2e6bb5ec13ebc1ecf0d37ed015b1b8/src/journal/journald-server.c#L1832
> https://github.com/systemd/systemd/blob/39cd62c30c2e6bb5ec13ebc1ecf0d37ed015b1b8/src/resolve/resolved-manager.c#L465
>
> I couldn't find anybody else actually polling on it. Interestingly, it
> looks like sd_event_add_io uses epoll() inside, but you're not hitting
> the bug that Jann pointed out (because I suppose you're not poll()ing on
> an epoll fd).

Well, if you made sure this still works, I am fine either way ;-)

Lennart

--
Lennart Poettering, Berlin