Finding used socket receive-buffer size

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# 1  
Old 08-13-2009
Question Finding used socket receive-buffer size

I have set the receive buffer size of socket to max.
setsockopt(sd,SOL_SOCKET, SO_RCVBUF,&max,optval);

Am reading data from the socket in a loop(say max 100 bytes per recv)
   int rlen=recv(sd,(void *)buf, 100 , 0);
   //err handle and processing

Assume my process is slow and the buffer(unread message size) is getting full.

Is there a way to find the unread bytes in the receive buffer(without reading them all),just to detect bottleneck?
# 2  
Old 08-13-2009
There a a number of techniques available. One way is to use the MSG_PEEK flag with recv() to peek at the data that is available to be read. See Section 13.7 Volume 1 2nd edition, UNIX network Programming by Richard Stevens for a detailed discussion.
# 3  
Old 08-13-2009
I also got one more soln. from another forum
ioctl( sock_fd, SIOCINQ, &numBytes )

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