• Marcone (4/4) Nov 14 2020 Socket s = new Socket(AddressFamily.INET, SocketType.STREAM);
• FreeSlave (23/27) Nov 14 2020 Perhaps using Socket.select and SocketSet?
• Anonymouse (29/33) Nov 15 2020 My program does something like this. (untested)

Marcone <marcone email.com> writes:

Socket s = new Socket(AddressFamily.INET, SocketType.STREAM);
s.connect(new InternetAddress("domain.com", 80));

I want that program raise an error if reach for example 30 
seconds of timeout.

FreeSlave <freeslave93 gmail.com> writes:

On Sunday, 15 November 2020 at 00:05:08 UTC, Marcone wrote:
 Socket s = new Socket(AddressFamily.INET, SocketType.STREAM);
 s.connect(new InternetAddress("domain.com", 80));

 I want that program raise an error if reach for example 30 
 seconds of timeout.

Perhaps using Socket.select and SocketSet?

import std.socket;
import std.stdio;
import core.time;

void main()
{
     Socket s = new Socket(AddressFamily.INET, SocketType.STREAM);
     s.blocking = false;
     auto set = new SocketSet(1);
     set.add(s);
     s.connect(new InternetAddress("dlang.org", 80));
     scope(exit) s.close();
     Socket.select(null, set, null, dur!"seconds"(10));
     if (set.isSet(s))
     {
         writeln("socket is ready");
     }
     else
     {
         writeln("could not connect");
     }
}

Anonymouse <zorael gmail.com> writes:

On Sunday, 15 November 2020 at 00:05:08 UTC, Marcone wrote:
 Socket s = new Socket(AddressFamily.INET, SocketType.STREAM);
 s.connect(new InternetAddress("domain.com", 80));

 I want that program raise an error if reach for example 30 
 seconds of timeout.

My program does something like this. (untested)

Socket s = new TcpSocket;
s.setOption(SocketOptionLevel.SOCKET, SocketOption.RCVTIMEO, 
30.seconds);
s.setOption(SocketOptionLevel.SOCKET, SocketOption.SNDTIMEO, 
30.seconds);

auto addresses = getAddress("domain.com", 80);
bool isConnected;

foreach (address; addresses)
{
     try
     {
         s.connect(address);
         isConnected = true;
         break;
     }
     catch (SocketException e)
     {
         // Failed, try next address
         writeln(e.msg);
     }
}

if (!isConnected) return false;  // failed to connect

// Connected

You can tell whether a read timed out by looking at the amount of 
bytes read (when `Socket.receive` returns `Socket.ERROR`) and the 
value of `std.socket.lastSocketError` (and/or 
`core.stdc.errno.errno` equaling EAGAIN).