Swatantra-66 opened a new pull request, #21115:
URL: https://github.com/apache/nuttx/pull/21115
## Summary
`<sys/time.h>` defines standard BSD/Linux convenience macros `timeradd`,
`timersub`, `timerclear`, `timerisset`, and `timercmp` for operations on
`struct timeval`.
Most standard C libraries (glibc, musl, FreeBSD, NetBSD, OpenBSD) provide
the corresponding operations for `struct timespec`: `timespecadd`,
`timespecsub`, `timespecclear`, `timespecisset`, and `timespeccmp`.
This patch implements these standard convenience macros in
`include/sys/time.h` mirroring the existing `timeval` implementations,
improving BSD/POSIX portability and compatibility.
## Impact
- **Users/Developers:** Adds standard `timespec` arithmetic and comparison
macros in `<sys/time.h>`.
- **Compatibility:** Backward compatible. No existing APIs, ABI, or
behaviors modified.
- **Build/Hardware:** No impact on existing builds.
## Testing
- Verified syntax, header inclusion (`<time.h>` is already included in
`include/sys/time.h`), and clean compilation.
- Verified style adherence via `tools/checkpatch.sh`:
- 0 errors, 0 warnings.
- All lines within standard 78-column limit.
- No trailing whitespace.
- Verified macro behavior across edge cases (carry on addition at boundary
$10^9\text{ ns}$, borrow on subtraction, equality, zero clearing, relational
comparison operators).
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