From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rick Jones <rick.jones2@hp.com>
Subject: Re: Maximum no of bytes Ethernet can transfer at a time ??
Date: Thu, 28 Apr 2011 14:24:55 -0700
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> I tried out something as you said.
> 
> I introduces this lines in my code,
> 
> getsockopt(s,SOL_SOCKET,SO_RCVBUF,&optval,&optlen);
> printf("The value of optlen is %d\n",optlen);
> 
> It always displays 4.

Because the length of the optval is always 4 when retrieving the
SO_RCVBUF setting.  You want to print the value of optval.

rick jones