RT-Thread-Studio/sdk-rt-thread-source-code: https://github.com/RT-Thread-Studio/sdk-rt-thread-source-code.git @ v4.0.3

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

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'])
```