#wayland on 2021-09-19 — irc logs at oftc.irclog.whitequark.org

2021-07-26 22:57 ChanServ changed the topic of #wayland to: https://wayland.freedesktop.org | Discussion about the Wayland protocol and its implementations, plus libinput | register your nick to speak

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09:09 <wlb> wayland-protocols Merge request !113 opened by Fabrice Fontaine (ffontaine) meson.build: wayland-scanner is only needed for tests https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/113

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09:35 <wlb> wayland-protocols/main: Fabrice Fontaine * meson.build: wayland-scanner is only needed for tests https://gitlab.freedesktop.org/wayland/wayland-protocols/commit/80e97bd00bf6 meson.build tests/meson.build

09:35 <wlb> wayland-protocols Merge request !113 merged \o/ (meson.build: wayland-scanner is only needed for tests https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/113)

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20:03 <unrelentingtech> just encountered a fun issue: a client suddenly started failing to read wl_keyboard's keymap fd (it's not using mmap like most clients do). Adding a seek to 0 fixes it. Seems kinda odd that my compositor would start returning fds with read position at the end only in the middle of the session and only just now (could be due to.. sharing a shared memory fd between clients?? and position being shared too?)

20:04 <unrelentingtech> But looks like wayland.xml leaves this completely undefined, the descriptor only "can be memory-mapped". Is it "technically forbidden" to read() it at all? Or is it just the client's responsibility to rewind in that case?

20:06 <kennylevinsen> unrelentingtech: what compositor?

20:08 <unrelentingtech> wayfire. looks like related to a very recent wlroots update, others have reported on sway https://github.com/wez/wezterm/issues/1144

20:15 <unrelentingtech> "it seems to work fine the first time wezterm is launched but not again until I relaunch sway" yeah so like the same client uses read() and then the next time it's launched it gets a keymap that's "been read" — seek position at the end because of the previous instance of the client

20:23 <emersion> unrelentingtech: hm the FD offset is shared between all clients

20:23 <emersion> unrelentingtech: clients should use pread() instead

20:25 <emersion> compositors historically have created one keymap file per client even if the data is the same

20:25 <emersion> wlroots has landed an optimization to create a single file instead

20:28 <unrelentingtech> oh, on the second page on github https://github.com/swaywm/wlroots/commit/d290b13871fa18dcad6cd90d9ee93e7205742124 huh I was *that* behind on updates before the most recent git pull

20:30 <unrelentingtech> emersion: thanks for the pread suggestion, that's better than lseek

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