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==== nginx linuxulator ====
<pre>
2025/04/09 17:52:30 [emerg] 51722#51722: io_setup() failed (38: Function not implemented)
2025/04/09 17:52:30 [alert] 51721#51721: epoll_ctl(1, 6) failed (22: Invalid argument)
/var/log/nginx # grep fail error.log 
</pre>
<pre>
# podman run --os=linux -d --name nginx nginx:1.27.4
# dmesg | grep linux | tail
linux: jid 106 pid 92741 (nginx): syscall io_setup not implemented
linux: jid 106 pid 92739 (nginx): epoll_ctl unsupported flags: 0x10000001
</pre>
<pre>
# kldunload linux_common
kldunload: can't unload file: Device busy
kldstat
Id Refs Address                Size Name
77    1 0xffffffff8ba2e000     73c0 linprocfs.ko
78    1 0xffffffff8baa7000     c2a8 linux_common.ko
# kldunload linprocfs
</pre>
<pre>
procstat -ak | grep linux
</pre>
https://github.com/jiixyj/epoll-shim
This is a small library that implements epoll on top of kqueue.

https://www.freshports.org/devel/libepoll-shim/
===== io_setup =====
https://github.com/TritonDataCenter/illumos-joyent/blob/master/usr/src/uts/common/brand/lx/syscall/lx_aio.c