[no subject]

[lakshmi gopinath <laksh2511@xxxxxxxxx>]

Hi,

Thanks for helping me out. I am yet to use poll. But I
am still having
problem with select. In the following code both the
FD_ISSET macro is
returning 1 for both the calls to select even before
data has arrived on
them ! So the recvfrom calls are proceeding
sequentially and until data
arrives in the recvfrom call it is blocking.

for(;;)
    {
      FD_SET(sockfd1,&set);
      FD_SET(sockfd2,&set);
      maxfd1 = max(sockfd1,sockfd2) + 1;
      select(maxfd1,&set,&set,NULL,&time);
      printf("\n sokcfd1 status =
%d",FD_ISSET(sockfd1,&set);
      printf("\n sokcfd 2 status =
%d",FD_ISSET(sockfd2,&set);

      if(status = FD_ISSET(sockfd1,&set))
       {
         bzero(buff1,sizeof(buff1));
        count = recvfrom(sockfd1,(char
*)buff1,sizeof(buff1),0,(struct
sockaddr *)&client,&addrlen);
         printf("\n %s",buff1);
       }

         if(status = FD_ISSET(sockfd2,&set))
        {
         bzero(buff2,sizeof(buff2));
        count = recvfrom(sockfd2,(char
*)buff2,sizeof(buff2),0, (struct
sockaddr *)&client,&addrlen);
         printf("\n %s ",buff2);
         }
     }
}

So i decided to make the recvfrom call non-blocking by
using the flag
MSG_DONTWAIT flag option. and i changed the code for
both the sockets as
follows :

count = recvfrom(sockfd2,(char
*)buff2,sizeof(buff2),MSG_DONTWAIT, (struct
sockaddr *)&client,&addrlen);
 if(errno != EWOULDBLCOK)
         printf("\n %s ",buff2);


but in this case both the sockets are not accepting
data from their
respective buffers. I am still not able to identiful
the problem. Could you
please help me out. I am refering Unix Network
Programming by Richard
Stevens, edition 2.

Regards,
Lakshmi


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