To address the limitations of select(), poll() is now used for Apple (MacOS and iOS) systems in the PhysicalSocketServer. Bug: webrtc:15421, webrtc:15908 Change-Id: Ic6703a08653ca608a714ea37ecbbfeaf29743c1f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/316480 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org> Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#42075}