Unix Socket(Unix域套接字) Back

  • Unix域Socket不是真正的網絡協議
  • 既提供分佈式進程間通信, 也提供同一台機器的進程間通信
  • 雙向通道
  • 分類(與pipe類似)
    • named
    • unnamed

1. Named Unix Socket

  • Unix域協議地址
  • bind時綁定一個Unix Socket時, 在該路徑名創建一個文件
  • 服務器可以接受多個客戶端鏈接請求
  • 使用connect()鏈接服務器
struct socketaddr_un
{
    short int sun_family;    //AF_UNIX
    char sun_path[104];    //file path
}

2. Unnamed Unix Socket

  • socketpair通常使用於父子進程間通信
  • 父進程f[0]關閉
  • 子進程f[1]關閉
  • 通信前不需要進行鏈接
  • socket是全雙工

method
int socketpair(int family, int type, int protocol, int fd[2])
parameters
  • family: 必須是AF_UNIX
  • type: SOCK_STREAM/SOCK_DGRAM
  • protocol: 0
  • fd: 存儲已創建的socket
return value
  • 0: success
  • -1: failure
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