Socket编程之setsockopt
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1.
setsockopt(s,SOL_SOCKET ,SO_REUSEADDR,(const char*)&bReuseaddr,sizeof(BOOL));
2.
setsockopt(s,SOL_SOCKET,SO_DONTLINGER,(const char*)& bDtLger,sizeof(BOOL));
3.
//发送时限
setsockopt(socket,SOL_S0CKET,SO_SNDTIMEO,(char *)&nNetTimeout,sizeof(int));
//接收时限
4.
int nRecvBuf=32*1024;//设置为32K
setsockopt(s,SOL_SOCKET,SO_RCVBUF,(const char*)&nRecvBuf,sizeof(int));
//发送缓冲区
int nSendBuf=32*1024;//设置为32K
setsockopt(s,SOL_SOCKET,SO_SNDBUF,(const char*)&nSendBuf,sizeof(int));
5.
setsockopt(socket,SOL_S0CKET,SO_SNDBUF,(char *)&nZero,sizeof(nZero));
6.
setsockopt(socket,SOL_S0CKET,SO_RCVBUF,(char *)&nZero,sizeof(int));
7.
setsockopt(s,SOL_SOCKET,SO_BROADCAST,(const char*)&bBroadcast,sizeof(BOOL));
8.
setsockopt(s,SOL_SOCKET,SO_CONDITIONAL_ACCEPT,(const char*)&bConditionalAccept ,sizeof(BOOL));
9.
};
linger m_sLinger;
m_sLinger.l_onoff=1;//(在closesocket()调用,但是还有数据没发送完毕的时候容许逗留)
// 如果m_sLinger.l_onoff=0;则功能和2.)作用相同;
m_sLinger.l_linger=5;//(容许逗留的时间为5秒)
setsockopt(s,SOL_SOCKET,SO_LINGER,(const char*)&m_sLinger,sizeof(linger));
注:1、在设置了逗留延时,用于一个非阻塞的socket是作用不大的,最好不用;2、如果想要程序不经历SO_LINGER需要设置SO_DONTLINGER,或者设置l_onoff=0;
10.
setsockopt(s,SOL_SOCKET,SO_DEBUG,(const char*)&bDebug,sizeof(BOOL));
11.
1)
……
//KeepAlive实现
int keepAlive = 1;//设定KeepAlive
int keepIdle = 5;//开始首次KeepAlive探测前的TCP空闭时间
int keepInterval = 5;//两次KeepAlive探测间的时间间隔
int keepCount = 3;//判定断开前的KeepAlive探测次数
if(setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(void*)&keepAlive,sizeof(keepAlive)) == -1)
{
}
if(setsockopt(s,SOL_TCP,TCP_KEEPIDLE,(void *)&keepIdle,sizeof(keepIdle)) == -1)
{
}
if(setsockopt(s,SOL_TCP,TCP_KEEPINTVL,(void *)&keepInterval,sizeof(keepInterval)) == -1)
{
}
2)
struct TCP_KEEPALIVE {
u_longonoff;
u_longkeepalivetime;
u_longkeepaliveinterval;
} ;
#define SIO_KEEPALIVE_VALS _WSAIOW(IOC_VENDOR,4)
//KeepAlive实现
TCP_KEEPALIVE inKeepAlive = {0}; //输入参数
unsigned long ulInLen = sizeof(TCP_KEEPALIVE);
TCP_KEEPALIVE outKeepAlive = {0}; //输出参数
unsigned long ulOutLen = sizeof(TCP_KEEPALIVE);
unsigned long ulBytesReturn = 0;
//设置socket的keep alive为5秒,并且发送次数为3次
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((unsigned int)s, SIO_KEEPALIVE_VALS,
(LPVOID)&inKeepAlive, ulInLen,
(LPVOID)&outKeepAlive, ulOutLen,
&ulBytesReturn, NULL, NULL) == SOCKET_ERROR)
{
}
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