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分享如何判断socket断开连接
除了看recv返回值还有什么好的方法吗？
以前在windows下方法好多,甚至就连select();都能，getsockopt也行，可是在linux下我试过select不行.
还有别的方法吗,不知道getsockopt能判断吗，怎么判断。或者有更好的判断方法
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jiniang 2005-03-03
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那我到底怎么才能判断出sock关闭了啊 ,up
yanghuajia 2005-02-28
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在linux下select 的第一个参数一定要填对， windows则不需要。
我曾经在这个问题上花了一天才弄明白。这是可能性最大的错误
我曾经在这个问题上花了一天才弄明白。这是可能性最大的错误
tukey 2005-02-28
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up
ringerxyz 2005-02-28
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结果select返回1了,这没问题呀，
以下摘自<<Unix Network Programming Volume 1,Third Edition The Sockets Networking API>>
A socket is ready for reading if any of the following four conditions is true:
b.The read half of the connection is closed (i.e., a TCP connection that has received a FIN). A read operation on the socket will not block and will return 0 (i.e., EOF).
A socket is ready for writing if any of the following four conditions is true:
b.The write half of the connection is closed. A write operation on the socket will generate SIGPIPE
以下摘自<<Unix Network Programming Volume 1,Third Edition The Sockets Networking API>>
A socket is ready for reading if any of the following four conditions is true:
b.The read half of the connection is closed (i.e., a TCP connection that has received a FIN). A read operation on the socket will not block and will return 0 (i.e., EOF).
A socket is ready for writing if any of the following four conditions is true:
b.The write half of the connection is closed. A write operation on the socket will generate SIGPIPE
jiniang 2005-02-27
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up
mwjx 2005-02-26
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好像是读socket的信息，为0就表示断开了，随便找本UNIX网络编程的书上就有
jiniang 2005-02-26
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我就是这样试的，当我关闭server端时，结果select返回1了，没返回错误!!
while(cmpp_recv_run)
{
FD_ZERO(&readfds);
FD_SET(sock,&readfds);
struct timeval tv;
tv.tv_sec=3; //3s timeout
tv.tv_usec=0;
int ret=select(sock+1,&readfds,NULL,NULL,&tv);
if(ret<0) //socket error
{
printf("sock close");
}
}
while(cmpp_recv_run)
{
FD_ZERO(&readfds);
FD_SET(sock,&readfds);
struct timeval tv;
tv.tv_sec=3; //3s timeout
tv.tv_usec=0;
int ret=select(sock+1,&readfds,NULL,NULL,&tv);
if(ret<0) //socket error
{
printf("sock close");
}
}
ringerxyz 2005-02-26
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select为什么不行？你是怎么试的？
如果在写socket时连接已经关闭，会产生SIGPIPE信号，这个也可以来判断连接已经关闭
如果在写socket时连接已经关闭，会产生SIGPIPE信号，这个也可以来判断连接已经关闭
sharkhuang 2005-02-26
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close一个select监听就是不退出。我遇到这问题还没解决。
