native_sim/posix missing features

[aescolar]

This is a non-exhaustive list of known missing* features in the native_posix board.
* missing = not (yet) implemented / supported, not (properly) tested.
The purpose being to make it clear for users, to track, and to have a container for requests.

• CONFIG_USERSPACE
• CONFIG_HW_STACK_PROTECTION
• Devices/drivers:
  • PTY UART pending feature:
    • interrupt driven IF
• Subsystems pending features/wishes:
  • Console: "pull style" ( getchar(), getline(), putchar() )
  • Logger backend: control verbosity from the executable command line ; merge the char out function with pre_print
  • A new shell backend routed to the process stdin/out
• New feature request: Support for doing blocking poll/select/read/write calls on host file descriptors (the block would block the calling zephyr thread, and yield to any other pending zephyr thread like it if was a zephyr blocking call, and if not idle zephyr all together)

Note that the reason why these have not been implemented yet is because there is not sufficient drive to do so, and nobody should expect there to be anytime soon.

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[andrewboie]

Add CONFIG_HW_STACK_PROTECTION and CONFIG_USERSPACE to this list.
Although off the top of my head I can't think of a good way to do it, it really does depend heavily on hardware. This might need to be a documented limitation.