cuiziweizw opened a new pull request, #3515:
URL: https://github.com/apache/nuttx-apps/pull/3515
## Summary
- **system/popen**: add `dpopen()`/`dpclose()` as the descriptor-based
counterpart of `popen()`/`pclose()`, analogous to how `dprintf()`
relates to `fprintf()`. `dpopen()` returns a raw file descriptor
instead of a `FILE` stream, avoiding the `stdio.h` dependency for
callers that only need an fd. `popen()` is refactored as a thin
wrapper: `dpopen()` + `fdopen()` + FILE container.
- **system/popen**: support no-shell mode via `posix_spawnp()`. The hard
dependency on `NSH_LIBRARY` is removed; when NSH is unavailable,
commands are split by whitespace and executed directly. Adds
`CONFIG_SYSTEM_POPEN_MAXARGUMENTS` (default 7).
- **testing/libc/popen**: add popen/dpopen tests covering both shell
(NSH) and no-shell modes.
Depends on the header declarations in the companion nuttx PR:
apache/nuttx#19008
## Testing
Ran the new `testing/libc/popen` test in both shell and no-shell
configurations; all 8 cases pass.
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