Ack.
The ping is sent over the display channel to check an upper limit for
the roundtrip time. If the tcp stack is busy, we postpone the ping.
So, without the ioctl, when the tcp stack is busy, the roundtrip
estimation will probably be much bigger than the real one. However, we
currently
The ioctl on sockets is actually named SIOCOUTQ though its value
is identical to TIOCOUTQ which is for terminals.
SIOCOUTQ is linux specific so we add a header check and ifdef based
on the presence of the header
This prevents bogus ioctls on non-Linux platforms
---
configure.ac |1 +
