sin-ack 24fd8fb16f Kernel: Ensure socket is suitable for writing in sys$sendmsg ...

Previously we would return a bytes written value of 0 if the writing end
of the socket was full. Now we either exit with EAGAIN if the socket
description is non-blocking, or block until the description can be
written to.

This is mostly a copy of the conditions in sys$write but with the "total
nwritten" parts removed as sys$sendmsg does not have that.

2022-02-07 12:21:45 +01:00

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