another question about time()

[Abby (J.P.)]

Abby (J.P.) wrote:
> Tydr Schnubbis wrote:
>> Abby (J.P.) wrote:
>>> Hello, I'm trying to make a ping utility, I made a working ICMP 
>>> request (I tested it with Ethereal, I get a reply from the server). 
>>> But I wonder how much precise are the std.c.time.time() or the 
>>> std.date.time(), because I always find a ping of 0ms (I know that it 
>>> must be 1000 ticks per seconds, but I'm not sure, this really is).
>>> Here is my code :
>>>
>>>
>>> char[] host = "www.microsoft.com"
>>> InternetHost targetHost;
>>> targetHost.getHostByName(host);
>>>
>>> InternetAddress targetAddress = new 
>>> InternetAddress(targetHost.addrList[0], InternetAddress.PORT_ANY);
>>>
>>> Socket pingingSocket = new Socket(AddressFamily.INET, SocketType.RAW, 
>>> ProtocolType.ICMP);
>>>
>>> //pingingSocket.connect(targetAddress);
>>> //long start_time = getUTCtime();
>>> int start_time;
>>> std.c.time.time(&start_time);
>>>
>>> pingingSocket.sendTo(PING_REQUEST, targetAddress);
>>>
>>> char[] response;
>>> pingingSocket.receive(response);
>>>
>>> //long end_time = getUTCtime();
>>> int end_time;
>>> std.c.time.time(&end_time);
>>>
>>> // char [] str_ping = std.string.toString((end_time - start_time));
>>> char [] str_ping = std.string.toString((end_time - start_time)/2);
>>> pingingSocket.close();
>>> printf("ping : " ~ str_ping);
>>>
>>> As you can see, I tried both std.c.time and std.date functions, but 
>>> str_ping is always 0. Did I done something wrong ? Should I put the 
>>> start_time before the resolving getHostByName() ?
>>>
>>> -- 
>>> Abby
>>
>> I can't ping www.microsoft.com at all, did you try another address, 
>> like google.com?
> 
> yes, I tried few addresses (I thought microsoft.com would work also)
> IP addresses on my LAN (with getHostByAddr) produce the same probleme.
> But you're right, I should check the char[] response to see if the 
> server has anwsered me !
> 
> I'm going to use std.perf as Dereck told me (I hope it will work !)
> 
> Thanks for your anwsers
> 
> -- 
> Abby
After testing the content of char[] response, it looks like the problem 
comes from
pingingSocket.receive(response)
The string is always null, and that might also be the cause of my bad 
timer. But I can see the resquest AND the reply fom the server in 
ethereal. Is there something special to do, when working with ICMP packets ?
I didn't use
connect(Address)
so my socket is not connected, maybe I should specify that it has to 
listen for incoming packets ?