Client-Server problem - send timestamp

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Client-Server problem - send timestamp

 
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  #1
Aug 26th, 2008
Hello there!

I've built a simple server and a simple client in C (Linux).
Among other tasks, I need the server to send the timestamp (using time.h) to the client.
Then I need the client to change the system time based on the timestamp received from the server.

What would be the best way?
I already get the timestamp in the client, but as a string after using asctime, this way:

c Syntax (Toggle Plain Text) 
  1. time_t now;
  2. struct tm* myTime;
  3.  
  4. now = time(NULL); 
  5. myTime = localtime(&now);
  6.  
  7. strcpy(msgTime, asctime(myTime));
  8. int msgSize = strlen(msgTime);
  9.  
  10. send(sockCli, msgTime, msgSize, 0);

But this is just a string...
Is there a way of receiving the number of seconds in the client and thus making it a lot easier to do time operations? How?

Thank you for any hints!
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Re: Client-Server problem - send timestamp

 
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  #2
Aug 26th, 2008
i dont understand your question.

you want to send the number of seconds?

well.... the number of seconds of "what"?
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Re: Client-Server problem - send timestamp

 
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  #3
Aug 27th, 2008
You got the time in string and you want to manipulate it?
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Re: Client-Server problem - send timestamp

 
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Aug 27th, 2008
You can use atoi() for converting "ASCII" to "integer".
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Re: Client-Server problem - send timestamp

 
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  #5
Aug 27th, 2008
Instead of sending the string returned by asctime() why now just convert the integer returned by time() to a string and send that? Then on client side just convert back to int and use it to change the computer's clock. If client needs the string returned by asctime() then it can get it itself from the string you send that was returned by time().
Last edited by Ancient Dragon; Aug 27th, 2008 at 9:58 am.
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Re: Client-Server problem - send timestamp

 
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  #6
Aug 28th, 2008
How about transmission delay? See, for example:
http://en.wikipedia.org/wiki/Network_Time_Protocol
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