Moved monitor() and readline() into net.py and node.py respectively,
which will hopefully be useful for monitoring large sets of hosts,
as is done in udpbwtest.py.
Changed iperf to use interactive command infrastructure (such as it
is), which may make it more reliable. Hopefully it's a bit clearer
as well, although it is slightly more complicated.
I've changed the way things work a bit:
1. netns is replaced by mnexec, a general-purpose mininet helper.
2. For interactive commands, we now use mnexec -p, which prints out
the pid, so we can kill it when someone hits control-C!
3. We close file descriptors for subshells. This might save memory,
but who knows.
4. We detach our subshells from the tty using mnexec -s; thus
control-C should not terminate everything.
5. Given 4, mn -c is now necessary if you kill mininet.
I've changed the way things work a bit:
1. netns is replaced by mnexec, a general-purpose mininet helper.
2. For interactive commands, we now use mnexec -p, which prints out
the pid, so we can kill it when someone hits control-C!
3. We close file descriptors for subshells. This might save memory,
but who knows.
4. We detach our subshells from the tty using mnexec -s; thus
control-C should not terminate everything.
5. Given 4, mn -c is now necessary if you kill mininet.
Call netns using setsid to detach from the tty; this is
intended to fix the problem of control-C killing your network.
sendInt() doesn't actually work - hopefully we can fix this in the
future, but it's tricky since we want to detach the many shells from
our tty, but then optionally send tty interrupts to them! Ideally we
would either know the pid of the subprocess or be able to send a signal
to bash to get it to interrupt its subprocess.
waitOutput() now uses monitor. We also handle sentinels
coming in the middle of output (but default at end should
still work well.)
Call netns using setsid to detach from the tty; this is
intended to fix the problem of control-C killing your network.
sendInt() doesn't actually work - hopefully we can fix this in the
future, but it's tricky since we want to detach the many shells from
our tty, but then optionally send tty interrupts to them! Ideally we
would either know the pid of the subprocess or be able to send a signal
to bash to get it to interrupt its subprocess.
waitOutput() now uses monitor. We also handle sentinels
coming in the middle of output (but default at end should
still work well.)
We need to figure out how to specify the IP addresses for the
routed control network. For now I'm going back to 192.168.12x.y
Also changed controller params to use IP strings rather than
numbers. However, we still need to clarify what ControllerParams
is actually for.
Also tweaked cmd/cmdPrint to make them more beautiful and functional,
and a few other minor changes, such as using a new idiom for verbose.
These changes support reinstating the examples.
There is probably a better way of doing this, but currently
parseCustomFile can modify globals (e.g. TOPOS) as well as
instance variables (self.validate) and classes (e.g. MyTopo),
which are also in the global name space.
Inconveniently enough, lambdas don't seem to be full closures
in Python; if they were, this trickiness would be unnecessary.
Even so, using execfile() seems like it might be a bit dubious...
This increases flexibility by allowing a topology to be manually created
in Python, or specified using another format, without having to create
a Topo object first.
However, Topos are useful, and are still the default topology object!
Shell now works (although we should use quietRun instead to avoid
file descriptor problem!)
exit/quit/EOF now all exit.
Renamed pingall and pingpair to make them easier to type - I think
commands should not require use of the shift key in general, although
ping-all and ping-pair might be OK.
Bob Lantz