Experiment with execution model

[bluejekyll]

At this point this is only a POC. There is a lot of work todo, but this is promising, if minimal. It should be portable across Unixs (Linux/macOS), Windows will be something else to investigate.

At this point (list will grow) this shows:

• [x] forking and passing control to unnamed processes
• [x] association of stderr and stdout
• [x] Integrate with Tokio
• [x] passing a pipe (eventually this will be stdout) from one process to another.
  • [x] this is required to be Unix Domain Sockets
  • [ ] support the Launcher spawning processes and sending stdout/err to the Logger
• [ ] Establish control protocol for processes
  • [ ] use stdin for input controls?, rather than sockets.
  • [ ] create ipc layer for all services (socket or pipe based messaging?)
• [ ] signal handling
  • [ ] sigchld, vermilion should shut everything down if it crashes
  • [ ] sighup, etc.

more ...