tree 1e546b58c96e1f7ed41caa4df0cee13458faf42e
parent 435856be518c9d3531ae5b8cbadac1474d521f3a
author Daniel Willmann <dwillmann@sysmocom.de> 1695907693 +0200
committer Daniel Willmann <dwillmann@sysmocom.de> 1695916265 +0200

osmo_io: Only allow reading/writing if the relevant callback is set

Allow the callbacks to be NULL, but then sending/receiving is disabled.
There are some cases where we only care about writing to or reading from
an fd.

Change-Id: I11ce072510b591f7881d09888524426579bd0169