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Description
socket 长连接
BOOL _KeepAlive(SP_SOCKET fd)
{
//定义结构及宏
struct KeepAlive
{
u_long onoff;
u_long keepalivetime;
u_long keepaliveinterval;
};
#define SIO_KEEPALIVE_VALS _WSAIOW(IOC_VENDOR,4)
//KeepAlive实现
KeepAlive inKeepAlive = { 0 }; //输入参数
unsigned long ulInLen = sizeof(KeepAlive);
KeepAlive outKeepAlive = { 0 }; //输出参数
unsigned long ulOutLen = sizeof(KeepAlive);
unsigned long ulBytesReturn = 0;
//keepalive xp以前的系统发送5次，xp之后的系统发送10
inKeepAlive.onoff = 1;
inKeepAlive.keepaliveinterval = 5000; //两次KeepAlive探测间的时间间隔
inKeepAlive.keepalivetime = 5000; //开始首次KeepAlive探测前的TCP空闭时间
if (WSAIoctl((SOCKET)fd, SIO_KEEPALIVE_VALS,
(LPVOID)&inKeepAlive, ulInLen,
(LPVOID)&outKeepAlive, ulOutLen,
&ulBytesReturn, NULL, NULL) == SOCKET_ERROR)
{
LOGT("Set Keep Alive FAILED.");
return FALSE;
}
else
{
LOGT("Set Keep Alive OK.");
return TRUE;
}
}blog link [socket 长连接](https://holdyounger.github.io/Code/网络编程/windows Socket长连接/)