RT-Thread-Studio/sdk-rt-thread-source-code: https://github.com/RT-Thread-Studio/sdk-rt-thread-source-code.git @ 4.0.3

yaxing.chen c0257098b9 release rt-thread v4.0.3		4 tahun lalu
..
sys	c0257098b9 release rt-thread v4.0.3	4 tahun lalu
SConscript	c0257098b9 release rt-thread v4.0.3	4 tahun lalu
readme.md	c0257098b9 release rt-thread v4.0.3	4 tahun lalu
termios.h	c0257098b9 release rt-thread v4.0.3	4 tahun lalu
time.c	c0257098b9 release rt-thread v4.0.3	4 tahun lalu
unistd.c	c0257098b9 release rt-thread v4.0.3	4 tahun lalu

Attentions

This folder is "common" for armlibc newlibc and dlib. It's not "common" for minilibc.
If you want to add new .c files, please do not forget to fix SConscript file too. eg:
```
if GetDepend('RT_USING_POSIX') == False:
    SrcRemove(src, ['unistd.c'])
```