TCP not reconnecting when connection is reset by remote server

[cipriancraciun]

I have built the latest v1.4 code on OpenSUSE Leap 15.5, and I've tried to push the messages to a remote TCP syslog server.

However, if the remote syslog server restarts, thus resetting the TCP connection, systemd-netlogd fails to detect the broken connection and thus fails to try to reconnect.

strace-ing the systemd-netlogd process yields the following events (that pertain to network activity):

• before the remote server is restarted, thus before resetting the connection, systemd-networkd issues the sendmsg syscall to which it receives a positive outcome;
• however, after the remote server is restarted, when systemd-networkd tries to sendmsg the next message, it gets the following syscall return -1 EPIPE (Broken pipe)
• from here onwards, it tries to resend the same message over and over, without trying to reconnect;

[ssahani]

Please test with https://github.com/systemd/systemd-netlogd/pull/105

[cipriancraciun]

I've just tasted with latest main commit (that includes the pull you've mentioned), and apparently it works as expected now.

Thanks!