I am sure I saw some open source server written in Go that was able to restart and keep connections open.
I can't find it to learn that technique.
I know apache.httpd has apachectl graceful that restarts and keeps connections open.
How does it done in general and in Go?
I thought it must fork and 1 exit, 2 exec(new go app) and link connections by Fd.
But in Go I can find only ForkExec function. I think Fork is required. Also syscall package is not very well documented.