aditya0yadav opened a new pull request, #18331:
URL: https://github.com/apache/nuttx/pull/18331
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## PLEASE DONT MERGE THIS PR
## Summary
This change updates the POSIX simulator host timer implementation to
handle platform differences between macOS (Darwin) and Linux.
macOS does not provide full support for POSIX timers such as
`timer_create()` and `timer_settime()`. To address this, the simulator
now uses `setitimer()` on macOS while retaining POSIX timers with
absolute-time scheduling on Linux and other POSIX systems.
The platform selection is handled via the `NUTTX_DARWIN` macro, keeping
the simulator core logic unchanged while improving portability and
correctness on macOS.
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## Impact
* Improves portability of the POSIX simulator on macOS hosts.
* No functional or behavioral change for Linux or other POSIX platforms.
* No impact on target hardware, board support, or NuttX core logic.
* No documentation or security impact.
* Build behavior remains unchanged on supported Linux systems.
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## Testing
* **Tested on macOS (Darwin)**:
* Host: macOS (Apple Silicon)
* Simulator: POSIX SIM
* Verified successful build and runtime execution.
* Confirmed timer interrupts are delivered via `SIGALRM` and simulator
scheduling behaves as expected.
* **Linux testing**:
* Not yet tested on a Linux host.
Since this change affects host timer handling, additional testing on
Linux systems would be valuable before merging.
If anyone is able to test this change on a Linux PC and confirm that the
POSIX simulator builds and runs correctly, that feedback and any logs
would be greatly appreciated.
One more thing ,
For supporting macos, multiple things need to be done like docs and linker
too .
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