Hello,
I'm currently researching how services work within Dovecot and what
scope these services are capable of. For example, I created a service as
such:
service myservice {
executable = /home/me/executable
type = worker
unix_listener myservice {
mode = 0666
}
}
When data is provided to the myservice unix socket, Dovecot appears to
create a new process by executing "/home/me/executable". I found out
about "status updates" through examining the logs. At first I received this:
master: Error: service(myservice): Initial status notification not
received in 30 seconds, killing the process
What is this status notification?
I found out that writing to file descriptor 5 from the executable does
seem to be valid. When I write out 12 bytes I don't get an error, but
when I write out 13 bytes I get the following:
master: Error: service(dmon): service sent partial status update (13 bytes)
What I've also noticed is that exiting 0 will cause Dovecot to spawn the
process again, in what appears to be infinitely.
Are there any resources/documentation that I could reference to learn
more about how services work on a lower level besides just looking at
the source code?
Thanks.
