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how check socket's close

Posted on 2001-07-01
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Last Modified: 2008-03-17
i have a c/s program in unix.but i don't check the close of client's.
  at first ,i check the return of recv,if it equal 0,then the client is close.and i do in my way.
  but if the client host is shutdown.the return of recv is -1.so i couldn't check the status of client's quit.
  how do i do ?
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Question by:tsjit
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7 Comments
 
LVL 2

Expert Comment

by:MadYugoslav
ID: 6243893
I recv return -1 that mean some error. If You don't want to check error (some socket get last error function) You can said that it mean Your socket is closed and no more available. That mean that problem is ion your side of communication.
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Author Comment

by:tsjit
ID: 6243989
 i used socket nonblock.and every time i check the error no ,it is 11.after i shutdown the client's host.the error no is not change.
  qnx is the opration of me.
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LVL 2

Expert Comment

by:MadYugoslav
ID: 6244034
I use MSVC 6.0. You could check is this error for SOCKET_INVALIDHANDLE that mean that your socket is closed.
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LVL 10

Expert Comment

by:makerp
ID: 6244087
this is from my Stream class, it checks for close and error. it is for windoze but you will get the idea

int Stream::recvData(char *buffer,int len,int option)
{
     int so_far = 0;
     int res = 0;
     so_far = recv(sock,buffer,len,0);
     if(so_far == SOCKET_ERROR || so_far == 0)
     {
          last_error = WSAGetLastError();
          return FAILURE;    
     }
     /* should we wait for 'len' to arrive */
     if(option == RECV_UPTO_LEN)
     {
          while(so_far < len)
          {
               res = recv(sock,buffer + so_far,len - so_far,0);
               if(res == SOCKET_ERROR || so_far == 0)
               {
                    last_error = WSAGetLastError();
                    return FAILURE;
               }
               so_far += res;
          }
     }
     return so_far;
}

0
 

Author Comment

by:tsjit
ID: 6244219
thank you ,but i am in qnx opration.are you give me more detail about unix and so.because they can not supple WSAGetLastError() or some like this.
         
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Expert Comment

by:griessh
ID: 6820141
I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. Unless there is objection or further activity,  I will suggest to refund the points and PAQ at zero points since nobody had a solution for you.

The link to the Community Support area is: http://www.experts-exchange.com/jsp/qList.jsp?ta=commspt

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner

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Accepted Solution

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ComTech earned 0 total points
ID: 6837812
This question will be moved to PAQ.

Regards,
ComTech
CS @ EE
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