TCP

| 阶段 | 服务器 | 客户端 | | ——– | —–: | :—-: | | | socket | socket | | | bind | | | | listen | | | | accept | connect | | | write | write | | | read | read | | | close | close |

UDP

| 阶段 | 服务器 | 客户端 | | ——– | —–: | :—-: | | | socket | socket | | | bind | | | | sendto | recvfrom | | | recvfrom | sendto | | | close | close |