Network Connection retention mechanism (Heartbeat mechanism to switch)

1. typedef struct stcpkeepalive2
2 .{
3. DWORD Onoff;
4. DWORD KeepAliveTime;
5. DWORD keepaliveinterval;
6.
7.} tcp_keep_alive2;
8.
9. Void setkeeplive (socket m_socket)
10 .{
11. Const char chopt = 1; // true
12. // set keepalive to enable the persistence mechanism to prevent the server from generating dead connections.
13. If (setsockopt (m_socket, sol_socket, so_keepalive, (char *) & chopt, sizeof (chopt) = 0)
14 .{
15. // set timeout details
16. tcp_keep_alive2 klive;
17. klive. Onoff = 1; // enable TTL
18. klive. KeepAliveTime = 1000*15; // 3-minute timeout keep alive
19. klive. keepaliveinterval = 1000*5; // the Retry Interval is 5 seconds. resend if no-reply
20. wsaioctl
21 .(
22. m_socket,
23. sio_keepalive_vals,
24. & klive,
25. sizeof (tcp_keep_alive2 ),
26. null,
27. 0,
28. (unsigned long *) & chopt,
29. 0,
30. null
31 .);
32 .}
33 .}