cmdserver: add service that listens on unix domain socket and forks process Typical use case of 'unix' mode is a background hg daemon. $ hg serve --cmdserver unix --cwd / -a /tmp/hg-`id -u`.sock Unlike 'pipe' mode in which parent process keeps stdio channel, 'unix' server can be detached. So clients can freely connect and disconnect from server, saving Python start-up time. It might be better to write "--cmdserver socket -a unix:/sockpath" instead of "--cmdserver unix -a /sockpath" in case hgweb gets the ability to listen on unix domain socket.