RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 06e01da1d55b029818d151c71dc0d46c710d7485

Meco Man 19c8cab8bd update		4 anni fa
..
sys	598aa86f75 move clock_time_to_tick to time.c	5 anni fa
SConscript	e927a53b41 精简exit abort system函数	4 anni fa
readme.md	d5f8830177 add newlib/dlib readme	5 anni fa
stdlib.c	eaa3454bbe 优化abort函数	4 anni fa
termios.h	54143409ca 增加#include <rtconfig.h> 防止开启termios功能后报错	5 anni fa
time.c	598aa86f75 move clock_time_to_tick to time.c	5 anni fa
unistd.c	19c8cab8bd update	4 anni fa

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'])
```