解决QTcpSocket state总是连接状态，即使把网线拔了

最新推荐文章于 2025-09-11 19:20:47 发布

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原文链接：https://stackoverflow.com/questions/10445122/qtcpsocket-state-always-connected-even-unplugging-ethernet-wire/10447560#10447560

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#网络 #tcp/ip #服务器 #qt

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本文介绍了如何使用setsockopt函数设置TCP连接的保持活跃参数，包括SO_KEEPALIVE、TCP_KEEPIDLE、TCP_KEEPCNT和TCP_KEEPINTVL，以确保在无数据交换时维持连接活性，防止因网络闲置导致的连接断开。

int enableKeepAlive = 1;
int fd = socket->socketDescriptor();
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &enableKeepAlive, sizeof(enableKeepAlive));

int maxIdle = 10; /* seconds */
setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &maxIdle, sizeof(maxIdle));

int count = 3;  // send up to 3 keepalive packets out, then disconnect if no response
setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &count, sizeof(count));

int interval = 2;   // send a keepalive packet out every 2 seconds (after the 5 second idle period)
setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &interval, sizeof(interval));