[riot-notifications] [RIOT-OS/RIOT] cpu/native: make use of stdio_read() / stdio_write() (#16822)

benpicco notifications at github.com
Tue Sep 7 16:35:54 CEST 2021

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Therefore, before describing what your contribution is about, we would like
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### Contribution description

On `native` the functions stdio_read() / stdio_write() were not used.
Those functions are intended for alternative stdio implementations.
As a result, no alternative stdio could be used on `native`.

To fix this, call the functions in `_native_read()` / `_native_write()` when dealing with stdio fds.

### Testing procedure

`native` applications should work as before.
But now alternative stdio implementations are possible.

### Issues/PRs references

needed for #16723 to work on `native` 

You can view, comment on, or merge this pull request online at:


-- Commit Summary --

  * cpu/native: make use of stdio_read() / stdio_write()

-- File Changes --

    M cpu/native/stdio_native/stdio_native.c (16)
    M cpu/native/syscalls.c (44)

-- Patch Links --


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