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Update process_commu.md #233

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May 23, 2024
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Update process_commu.md #233

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4 changes: 2 additions & 2 deletions os/4_process/process_commu.md
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Expand Up @@ -238,14 +238,14 @@ $ kill -l
我们来看看创建 socket 的系统调用：

```c
int socket(int domain, int type, int protocOl)
int socket(int domain, int type, int protocol)
```

三个参数分别代表：

- domain 参数用来指定协议族，比如 AF_INET 用于 IPV4、AF_INET6 用于 IPV6、AF_LOCAL/AF_UNIX 用于本机；
- type 参数用来指定通信特性，比如 SOCK_STREAM 表示的是字节流，对应 TCP、SOCK_DGRAM 表示的是数据报，对应 UDP、SOCK_RAW 表示的是原始套接字；
- protocOl 参数原本是用来指定通信协议的，但现在基本废弃。因为协议已经通过前面两个参数指定完成，protocol 目前一般写成 0 即可；
- protocol 参数原本是用来指定通信协议的，但现在基本废弃。因为协议已经通过前面两个参数指定完成，protocol 目前一般写成 0 即可；

根据创建 socket 类型的不同，通信的方式也就不同：

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