CTRL-C does not work if host is not online?

[varenius]

Trying to connect to host which seems down. After waiting a long time, I want to CTRL-C, but that does not work. I'm sitting here:

oper@gyller:~$ etc '/mnt/vgosc/c21060_oe*' HOST#2642:/export/vlbi/data/c21060_oe/ --resume -m 5
2021-06-10 21:33:50.39: [etdc::ETDServer::ETDServer(etdc::etd_state&)] ETDServer starting, my uuid=xgXAgEkVvsQcNwQ5
2021-06-10 21:33:50.40: [etdc::etdc_fdptr mk_client(const T&, const etdc::detail::client_settings&) [with T = etdc::protocol_type; etdc::etdc_fdptr = std::shared_ptr<etdc::etdc_fd>]] mk_client/attempt #1/3 trying to connect to tcp:HOST:2642
^C^C

Would be good to have CTRL-C work also in this moment. I'm using the 1.0.1 release of etc.

[haavee]

Urgh. That is a difficult one. I have an idea of how to solve this but it'd require rewriting the signal-handling infrastructure completely. But before doing that I'd need to experiment with my ideas to see if the system could be made to work not just in my head but also according to the laws of POSIX ...

[haavee]

Please try this branch https://github.com/jive-vlbi/etransfer/tree/issue-14, for me it does work cancelling startup for a host that's not online; I tried this:

./etc 1.2.3.4:/dev/zero:10MB /dev/null --buffer 4000000

And then pressing ^C:

^C
2021-06-23 14:31:53.85: Failed to create etdproxy: assertion error: /Users/verkouter/src/etransfer/src/etdc_etdserver.h:190 [__m_connection] The proxy must have a valid connection
2021-06-23 14:31:53.85: Program startup cancelled by user

[varenius]

Well, no cigar on this. Using the issue-14 branch, I try to run etc:

oper@gyller:/usr/local/src/etransfer/test/etransfer/Linux-x86_64-native-opt$ ./etc '/mnt/tsukuba/b21096_oe*' 1.2.3.4#2642:/export/vlbi/data/b21096oe/ -m 5 --resume
2021-09-15 13:49:46.37: [etdc::ETDServer::ETDServer(etdc::etd_state&)] ETDServer starting, my uuid=QpgQYJwAS4VOuqQajW
2021-09-15 13:49:46.37: [etdc::etdc_fdptr mk_client(const T&, const etdc::detail::client_settings&) [with T = etdc::protocol_type; etdc::etdc_fdptr = std::shared_ptr<etdc::etdc_fd>]] mk_client/attempt #1/3 trying to connect to tcp:1.2.3.4:2642

CTRL-C does nothing here, I have to "kill -9" etc to stop it.