net.ipv4.tcp_keepalive_intvl = 20net.ipv4.tcp_keepalive_PRobes = 3net.ipv4.tcp_keepalive_time = 60

#include #include #include #include #include int keepAlive = 1; // 開啟keepalive屬性int keepIdle = 60; // 如該連接在60秒內沒有任何數據往來,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,則后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));