int sockfd = socket(AF_INET, SOCK_DGRAM, 0)解释代码
时间: 2024-05-25 13:15:41 浏览: 10
This code creates a socket file descriptor using the socket() system call. The first argument AF_INET specifies the address family to be used, which is IPv4 in this case. The second argument SOCK_DGRAM specifies that this socket will be used for datagram (UDP) communication. The third argument 0 specifies the protocol to use, which will be determined automatically based on the address family and socket type. The function returns a non-negative integer sockfd which is the socket file descriptor on success, and -1 on failure.
相关问题
int sockfd = socket(AF_INET, SOCK_DGRAM, 0)
This line of code creates a new socket descriptor using the Internet Protocol (IP) family and the User Datagram Protocol (UDP) as the transport protocol. The third argument is set to 0, indicating that the default protocol for the given family and type should be used. The function call returns a file descriptor that can be used for subsequent socket operations.
SOCKET sockfd = socket(AF_INET, SOCK_DGRAM, 0);
这是一个创建UDP套接字的操作,其中:
- `AF_INET` 表示使用IPv4地址族;
- `SOCK_DGRAM` 表示使用数据报传输方式;
- `0` 表示使用默认的传输协议(通常为UDP)。
该函数返回一个整型的套接字描述符(socket descriptor),可以用于后续的套接字操作,如绑定、发送和接收数据等。如果返回值为-1,则表示创建套接字失败。
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