RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 3ebb48fae1c7765670bf248c80e12e657aa4f040

Meco Man 3ebb48fae1 add comment		4 lat temu
..
sys	598aa86f75 move clock_time_to_tick to time.c	4 lat temu
SConscript	e927a53b41 精简exit abort system函数	4 lat temu
readme.md	d5f8830177 add newlib/dlib readme	5 lat temu
stdlib.c	eaa3454bbe 优化abort函数	4 lat temu
termios.h	54143409ca 增加#include <rtconfig.h> 防止开启termios功能后报错	5 lat temu
time.c	598aa86f75 move clock_time_to_tick to time.c	4 lat temu
unistd.c	3ebb48fae1 add comment	4 lat temu

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'])
```