从socket获取地址族.Linux的

Question

我想为Linux Socket API编写一个C++包装器.在socket()ctor中请求地址族(AF).我不想再次在connect()签名中要求AF,因为它已经在socket的构造函数中给出了.那么如何从现有插座中获取AF？

Answer 1

该死的.搜索了大约半个小时.在发布这个问题后,我立即找到了答案.

带有选项SO_DOMAIN的getsockopt([...])(参见套接字选项)

Answer 2

POSIX标准的getsockname将有助于:

int getsockname(int socket, struct sockaddr *restrict address,
       socklen_t *restrict address_len);

它将填充给定的struct sockaddr(成功时):

struct sockaddr {
    unsigned short    sa_family;  // <- that's what you looking for
    char              sa_data[14];  
}