Define eventfd on NetBSD #4830

krobelus · 2025-11-16T13:24:05Z

Like FreeBSD, NetBSD supports eventfd, see
https://man.netbsd.org/eventfd.2.
OpenBSD does not AFAICT.

(for some reason my local rustfmt wants to reformat imports)

JohnTitor · 2025-11-17T11:13:34Z

src/unix/bsd/netbsdlike/netbsd/mod.rs

+    pub fn eventfd(init: c_uint, flags: c_int) -> c_int;
+    pub fn eventfd_read(fd: c_int, value: *mut eventfd_t) -> c_int;
+    pub fn eventfd_write(fd: c_int, value: eventfd_t) -> c_int;


Any reason that these fn args names don't match with man page?

rustbot · 2025-11-17T17:41:26Z

Some changes occurred in solarish module

cc @jclulow, @pfmooney

Some changes occurred in the Android module

cc @maurer

krobelus · 2025-11-17T17:42:02Z

+ pub fn eventfd_write(fd: c_int, value: eventfd_t) -> c_int; Any reason that these fn args names don't match with man page?

I might have copied it from the FreeBSD ones. Fixed

tgross35 · 2025-11-19T11:05:59Z

Please include permalinks to the headers too, manpages don't show the values. In this case: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h.

To fix the CI failure you'll need to add the relevant header to libc-test/build.rs.

Why is the arg name changed in all the other files? That should be dropped, or at least moved to a separate commit if there is a reason.

tgross35

(updating status)

rustbot · 2025-11-19T11:06:15Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

krobelus · 2025-11-19T11:19:06Z

Why is the arg name changed in all the other files? That should be dropped,

I forgot to copy the commit message to the PR description - this is to match the OS manpages (or headers where I didn't find manpages).

or at least moved to a separate commit if there is a reason.

sure

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h

rustbot · 2025-11-23T07:55:05Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

krobelus · 2025-11-23T08:18:17Z

split commits and updated tests and commit messages.
I'm not sure if this works for 100% of all NetBSD 10 systems out there,
but this was introduced in 2021 so it might be fine.

tgross35

LGTM, thank you!

(backport <rust-lang#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <rust-lang#4830>) (cherry picked from commit 3e82c57)

(backport <rust-lang#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <rust-lang#4830>) (cherry picked from commit 3e82c57)

(backport <rust-lang#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <rust-lang#4830>) (cherry picked from commit 3e82c57)

(backport <rust-lang#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <rust-lang#4830>) (cherry picked from commit 3e82c57)

(backport <rust-lang#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <rust-lang#4830>) (cherry picked from commit 3e82c57)

(backport <#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <#4830>) (cherry picked from commit 3e82c57)

(backport <#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <#4830>) (cherry picked from commit 3e82c57)

(backport <#4830>) (cherry picked from commit 3ff2a88)

Like FreeBSD but unlike OpenBSD, NetBSD supports eventfd since version 10 (September 2021, see http://netbsd.org/changes/changes-10.0.html). I don't know enough about NetBSD to know whether all systems running 10 can be expected to have eventfd, but it's probably fine. Our GitHub actions CI only tests NetBSD 10.1. Ref: https://man.netbsd.org/eventfd.2 Ref: https://github.com/NetBSD/src/blob/d04b0c735abc997743bb3faa74464524cbe7becd/sys/sys/eventfd.h (backport <#4830>) (cherry picked from commit 3e82c57)

rustbot added O-unix S-waiting-on-review labels Nov 16, 2025

krobelus force-pushed the netbsd-eventfd branch from f0917cc to 03be810 Compare November 16, 2025 14:06

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JohnTitor force-pushed the netbsd-eventfd branch from 2bf5e32 to 916a8cf Compare November 18, 2025 12:40

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krobelus force-pushed the netbsd-eventfd branch from 916a8cf to 7b5296c Compare November 23, 2025 07:54

krobelus added 2 commits November 23, 2025 08:54

Make eventfd argument names match OS docs/headers

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krobelus force-pushed the netbsd-eventfd branch from 7b5296c to 54559ab Compare November 23, 2025 07:55

tgross35 approved these changes Nov 30, 2025

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tgross35 added this pull request to the merge queue Nov 30, 2025

Merged via the queue into rust-lang:main with commit 3e82c57 Nov 30, 2025
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Make eventfd argument names match OS docs/headers

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tgross35 mentioned this pull request Dec 2, 2025

[0.2] Backports #4856

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krobelus commented Nov 16, 2025 •

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