c或c ++ with libevent / libev：监视UNIX套接字

Question

我正在尝试监视UNIX套接字（“/ tmp / mysocket”）。

我可以在node.js中执行此精细：它提出了一个事件时1）绑定的套接字，2）有人连接到插座，3）数据被发送到套接字，4）套接字已断开连接。

我现在在c / c ++中执行此操作：我想为上述事件监控“/ tmp / mysocket”。我看过libevent（我最好用的人），但看到它需要IP：端口。有没有办法监控UNIX套接字？

或者任何人都可以建议另一个C / C ++解决方案？

Answer 1

You could monitor a UNIX domain socket just like a regular file, since it can be operated like a file, e.g. in libev,

struct sockaddr_un address;
memset(&address, 0, sizeof(address));
address.sun_family = AF_LOCAL;
strcpy(address.sun_path, "/tmp/mysocket");

bind(socket, (struct sockaddr*)(&address), sizeof(address));
listen(socket, 5);

// now listen if someone has connected to the socket.
// we use 'ev_io' since the 'socket' can be treated as a file descriptor.
struct ev_io* io = malloc(sizeof(ev_io));
ev_io_init(io, accept_cb, socket, EV_READ);
ev_io_start(loop, io);
...

void accept_cb(struct ev_loop* loop, struct ev_io* io, int r)
{
    // someone has connected. we accept the child.
    struct sockaddr_un client_address;
    socklen_t client_address_len = sizeof(client_address);
    int client_fd = accept(socket, (sockaddr*)(&client_address),
                           &client_address_len);

    // 'read' / 'recv' from client_fd here.
    // or use another 'ev_io' for async read.
}

libevent should be similar.