[PR] nshlib: Let exit take an exit status. [nuttx-apps]

["casaroli (via GitHub)" <gi...@apache.org>]

casaroli opened a new pull request, #3873:
URL: https://github.com/apache/nuttx-apps/pull/3873

   ## Summary
   
   The NSH `exit` command took no argument and always exited with 0. `exit 3` failed with "too many arguments", so a script or `sh -c` could not report a failure with `exit`.
   
   This PR lets `exit` take an optional exit status from 0 to 255, as POSIX does. A status that is not a number, or is out of range, gives an error. Without an argument, `exit` still uses 0.
   
   ## Impact
   
   `exit <status>` works. `exit` without an argument does not change. apache/nuttx#NNNN documents the argument.
   
   ## Testing
   
   `qemu-armv8a:knsh` (QEMU 11 with HVF on an Apple M4): a test program runs `sh -c` with these commands:
   
   | `sh -c` command | master | this PR |
   |---|---|---|
   | `exit 3` | 255 | 3 |
   | `exit 0` | 255 | 0 |
   | `exit` | 0 | 0 |
   | `exit abc` | 255 | 255 (error) |
   | `exit 256` | 255 | 255 (error) |
   
   `ostest` on `qemu-armv8a:knsh` and `qemu-armv8a:nsh` ends with `ostest_main: Exiting with status 0`. `tools/checkpatch.sh -c -u -m -g` passes.
   


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Re: [PR] nshlib: Let exit take an exit status. [nuttx-apps]

["acassis (via GitHub)" <gi...@apache.org>]

acassis merged PR #3873:
URL: https://github.com/apache/nuttx-apps/pull/3873


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