[M] Change in osmo-bts[master]: osmo-bts-virtual: Port over to osmo_io

Attention is currently required from: jolly, laforge, pespin.

fixeria has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bts/+/36317?usp=email )

Change subject: osmo-bts-virtual: Port over to osmo_io ......................................................................

Patch Set 2:

(1 comment)

File src/osmo-bts-virtual/scheduler_virtbts.c:

https://gerrit.osmocom.org/c/osmo-bts/+/36317/comment/09280084_61ee0f4f PS2, Line 105: else if (rc == 0)

If the socket dies, not handling of rc <= 0 will result in an infinite loop of read events. […]

This is not `read()`, but `send()` code path. The return value is either the number of bytes sent, or -1. AFAIU, checking against 0 makes no sense (even before this patch), so this is why this block is being dropped?