Merge pull request #64 from zhangzhuang15/dev

Dev

Author: zhangzhuang15

docs/blog/system-program-with-c.md

@@ -2124,7 +2124,7 @@ int enableRawMode(int fd) {
     return 0;
 }
 ```
-Read [Kilo, a Simple Text Editor](/blog/terminal-kio), get more details.
+Read [Kilo, a Simple Text Editor](/blog/terminal-kilo), get more details.
 
 Terminal IO refers that you read message from terminal emulator and write message to terminal emulator. You can set a structure, called `termios`, change action of terminal emulator. Read [Terminal IO](/blog/terminal-io), get more details.
 
@@ -2450,6 +2450,7 @@ int main() {
 
 
 
-
+### direct syscall
+Normally, os provides libc for wrapping systemcall. If you want to make systemcall, you should invoke functions defined in libc. But if you want to make systemcall directly, not through libc, you can use assembly code. To make it simple, os provides c function like `syscall` , `__syscall` for wrapping assembly code. Unfortunately, not every os exposes this c function. In new version of macOS, `syscall` is deprecated and dropped([Github | related issue](https://github.com/google/glog/issues/185)), so you cannot search by `man syscall` getting more details. In linux, it's ok. Libc is not equal to c standard library, it contains c standard library and other parts.
 
 

docs/links/great-articles.md

@@ -9,6 +9,11 @@ aside: true
 ## rcore 操作系统教程
 [阅读原文](https://rcore-os.cn/rCore-Tutorial-Book-v3/chapter0/index.html)
 
+## zephyrproject
+[阅读原文](https://docs.zephyrproject.org/latest/introduction/index.html)
+
+zephyrproject 是一个用c开发的嵌入式操作系统，里边介绍了很多操作系统的知识。作为一个操作系统，它原生支持用 c/c++/rust 开发系统上面的软件。
+
 ## How Browser Rendering Works
 [阅读原文](https://blog.logrocket.com/how-browser-rendering-works-behind-scenes/)