Different exit codes for failure to connect and disconnect

[madduck]

Modify the return logic such that exit code 1 is used when the initial
connection fails, but if a session is established, and then the device
disconnects, exit code 2 is emitted.

Closes: Github:#3083
Signed-off-by: martin f. krafft [email protected]

[rom1v]

Hi,

Thank you for your PR.

I added a preliminary commit to report the 3 possible states in await_for_server() (this simplifies the implementation of this feature): 1f4c801

Then I made minor changes to your commit:

• use a dedicated enum scrcpy_exit_code (to avoid exposing SDL constants resulting of implementation details)
• (nitpick) EXIT CODES → EXIT STATUS in manpage (for consistency with other manpages)

The resulting branch is here: exit_code

Please review/test :)

[madduck]

@rom1v I've been running scrcpy from your exit-code branch, and it works just fine. Thank you!

[madduck]

Do you need me to migrate your branch over to this PR or should we just close this and make a new one on the basis of your branch?

[rom1v]

Merged into dev.

I also added a commit to document the exit statis in scrcpy --help: b1dbc30

Exit status:

      0  Normal program termination
      1  Start failure
      2  Device disconnected while running