[HP-UX 11.0]Different error message while receiving from a socket

grace_limi

I have the following statement of C programming under HP-UX 11.0:

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flags = 0;
nread = recv( sock, (char *)buf + totread, len - totread, flags );
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Sometimes I encountered with the following error:

nread = 0

Looking up the manual, I knew that it indicates the following information:

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            0   The socket is blocking and the transport connection to the
                remote node failed.
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However, sometimes the following error was faced:

nread = -1, errno = 232

indicating that:

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        [ECONNRESET]        A connection was forcibly closed by a peer.   
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Who can tell me what the differences are between the two scenarios?