execute: if the main process of a service already owns the TTY, don't wait for acquiring it again in the reload/stop step

tcpwrap: execute tcpwrap check in forked client, to avoid blocking name lookups in main systemd process

service: by default send service output to syslog, except for SysV services which should go to the console

socket: optionally call accept() for incoming connections and spawn one service instance per connection