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Hello!
There are cases when users would like to launch their wayland compositor via supervision suites, like systemd/runit/s6 etc.
And some of the supervision suites provide easy-to-implement mechanism to notify the supervisor that process is not just started, but "ready". You can read more about it here - https://skarnet.org/software/s6/notifywhenup.html
This PR introduces
-r <fdNum>option formangocommand. When specified, and fdNum > 2 (because 0, 1 and 2 are stdin, stdout, stderr), it would write\nto the given file descriptor and close it just before runningwl_display_run(), which would notify the supervision suite that mangowc is ready (the wayland socket is up, the inital setup and variables are set etc), so the supervision suite can launch other services that depend on mango (e.g. swwwd, fcitx, xdg desktop portals)