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From: Prabhu on 22 Apr 2008 10:33
Hi,

My client application tries to connect to the server in the following
manner:

...../
err = connect(sd, (struct sockaddr*) &sa, sizeof(sa));

if(err == -1)
{
if(errno == EINPROGRESS)
{
struct timeval l_connect_timeout;
int l_fds;
l_connect_timeout.tv_usec=0;
l_connect_timeout.tv_sec=30; //30 seconds.

while(1)
{
l_fds=select(sd+1, NULL,&filedes_set,NULL,
&l_connect_timeout);
if(l_fds == 0) //timed out
return 0;
else if(l_fds < 0) //select failed
return 0;
else
{
int l_sock_optval=-1;
int
l_sock_optval_len=sizeof(l_sock_optval);
if(getsockopt(sd,
SOL_SOCKET, SO_ERROR, (int*)&l_sock_optval,
(socklen_t*)&l_sock_optval_len) !=0)
{

return 0;
}

if(l_sock_optval == 0)
{
//connected to
server
break;
}
}

}

}

This works fine. The issue that I face is when the server refuses
connection by sending RST for the SYN from client. The select waits
for 30 seconds and later returns timing out. RST though is sent
immediately by the server. The client application need to capture the
RST as soon as it arrives. How do we achieve that. Why does not the
select return immediately when the RST arrives at client?

Thanks,
Prabhu. S
From: Rainer Temme on 23 Apr 2008 12:44
Prabhu wrote:
> err = connect(sd, (struct sockaddr*) &sa, sizeof(sa));
.....
> l_fds=select(sd+1, NULL,&filedes_set,NULL,&l_connect_timeout);

> This works fine. The issue that I face is when the server refuses
> connection by sending RST for the SYN from client. The select waits
> for 30 seconds and later returns timing out. RST though is sent
> immediately by the server. The client application need to capture the
> RST as soon as it arrives. How do we achieve that. Why does not the
> select return immediately when the RST arrives at client?

Have you tried to select() the filedescriptor for read (in the
read-fd-set) as well?
From: David Schwartz on 24 Apr 2008 16:50
On Apr 23, 9:44 am, Rainer Temme <Rainer_Te...(a)nospam.Hotmail_dot_Com>
wrote:
> Prabhu wrote:
> > err = connect(sd, (struct sockaddr*) &sa, sizeof(sa));
> ....
> > l_fds=select(sd+1, NULL,&filedes_set,NULL,&l_connect_timeout);
> > This works fine. The issue that I face is when the server refuses
> > connection by sending RST for the SYN from client. The select waits
> > for 30 seconds and later returns timing out. RST though is sent
> > immediately by the server. The client application need to capture the
> > RST as soon as it arrives. How do we achieve that. Why does not the
> > select return immediately when the RST arrives at client?
>
> Have you tried to select() the filedescriptor for read (in the
> read-fd-set) as well?

He's trying to connect. Checking for readability doesn't make sense
unless he has nothing else to do until the other side sends him any
data.

DS
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