net.ipv4.tcp_keepalive_intvl = 20

net.ipv4.tcp_keepalive_probes = 3

net.ipv4.tcp_keepalive_time = 60

#include 

#include 

#include 

#include 

#include 

int keepAlive = 1; // 開啟keepalive屬性

int keepIdle = 60; // 如該連線在60秒內沒有任何資料往來,則進行探測 

int keepInterval = 5; // 探測時發包的時間間隔為5 秒

int keepCount = 3; // 探測嘗試的次數.如果第1次探測包就收到響應了,則後2次的不再發.



setsockopt(rs, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepAlive, sizeof(keepAlive));

setsockopt(rs, SOL_TCP, TCP_KEEPIDLE
 
, (void*)&keepIdle, sizeof(keepIdle));

setsockopt(rs, SOL_TCP, TCP_KEEPINTVL, (void *)&keepInterval, sizeof(keepInterval));

setsockopt(rs, SOL_TCP, TCP_KEEPCNT, (void *)&keepCount, sizeof(keepCount));