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Nix on macOS

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“There are still many issues with the Darwin platform but most of it is quite usable.” — http://yves.gnu-darwin.org187 Servers

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22 Dec 2025
@reckenrode:matrix.orgRandy EckenrodeOr malloc it based on the size of the incoming set.17:49:12
@reckenrode:matrix.orgRandy EckenrodeGlib supports using cleanup functions to make that less messy.17:49:27
@reckenrode:matrix.orgRandy Eckenrode Though if it’s a mask for all fds, you don’t really know the needed size. 17:50:00
@reckenrode:matrix.orgRandy Eckenrodehttps://man.freebsd.org/cgi/man.cgi?select17:52:21
@reckenrode:matrix.orgRandy Eckenrode Apple mentioned FreeBSD being unlimited. I agree we should probably increase the amount of memory it’s using (either by defining FD_SETSIZE or some other way). 17:53:19
@reckenrode:matrix.orgRandy Eckenrode

Looks like (unsurprisingly) FreeBSD has a similar implementation.

https://github.com/freebsd/freebsd-src/blob/f51e9d0e0988df58c94db586ab5c8b5fd091c004/sys/sys/select.h#L65

17:55:17
@reckenrode:matrix.orgRandy EckenrodeI guess FreeBSD doesn’t enforce the limit if you define it to something non-default.17:55:46
@ihar.hrachyshka:matrix.orgIhar Hrachyshkaso darwin just broke the api to pass posix17:56:22
@ihar.hrachyshka:matrix.orgIhar Hrachyshkawell, broke -> adjusted to standard17:56:33
@hexa:lossy.networkhexa Randy Eckenrode, emily any reason I should not update the darwin buildfarm to tahoe? 21:45:40
@-chi:matrix.org@-chi:matrix.org left the room.21:48:15
@reckenrode:matrix.orgRandy EckenrodeNot that I can think of. It hasn’t broken Nix or Nixpkgs like updates have in the past.21:48:50
@qyliss:fairydust.spaceAlyssa Ross poll usability flip-flopping every macOS release is a sort of famous example of macOS POSIX-noncompliance: https://daniel.haxx.se/blog/2016/10/11/poll-on-mac-10-12-is-broken/ 21:49:59
@qyliss:fairydust.spaceAlyssa Ross * poll usability flip-flopping between macOS releases is a sort of famous example of macOS POSIX-noncompliance: https://daniel.haxx.se/blog/2016/10/11/poll-on-mac-10-12-is-broken/ 21:50:19
@qyliss:fairydust.spaceAlyssa Rossit might well presently work, but the track record is not confidence-inspiring21:50:48
@qyliss:fairydust.spaceAlyssa Rossand since you couldn't tell at build time whether the built program would end up being run on a macOS with broken poll, hardcoding not to use it on macOS was the only sensible solution21:52:12

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