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Re: [sumo-user] tcpip::SocketException in C++ TraCI
  • From: Michael Behrisch <oss@xxxxxxxxxxx>
  • Date: Sun, 21 Jun 2020 20:41:12 +0200
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Hi,
it may take some time for the OS to free the port and there is a limit
on the number of usable ports  but you should hit this only if try a lot
of runs, see
https://danielmendel.github.io/blog/2013/04/07/benchmarkers-beware-the-ephemeral-port-limit/
which states that MacOS can open up to 16383 connections.

I am not a Mac user but the article above suggests that you need to wait
15 seconds before the port becomes available again.

Best regards,
Michael

Am 21.06.20 um 00:50 schrieb Proyash Podder:
> Hi!
> I have been trying to use C++ TraCI and facing some weird issues. I have
> been trying to run the example source code found
> in https://sumo.dlr.de/docs/TraCI/C++TraCIAPI.html with a scenario which
> works fine in individual run.
> 
> The code compiles well and ran for the first time. But after that, I was
> trying to run it multiple times and it is not running with the following
> error message:
> /libc++abi.dylib: terminating with uncaught exception of type
> tcpip::SocketException: tcpip::Socket::connect() @ connect: Connection
> refused zsh: abort ./test/
> /
> /
> Initially, I thought that it might be an issue with port still open, I
> find the PID for the port and kill the process to open the port. But
> still the same error is shown. I have changed the port number (both in
> source code and command line), but still same result.
> 
> The most weird part is, While trying several times, for once the code
> again runs with literally no changes and now again it is not running.
> 
> I know, the problem may seem weird but any kind of help is appreciated.
> 
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