DOCUMENT:Q153524 13-JUN-2001 [sna] TITLE :Immediate CMRCV Response Also Trace the Buffer PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:2.11 SP1 OPER/SYS: KEYWORDS:kbprogramming ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, version 2.11 SP1, on platform(s): - the operating system: Microsoft Windows NT ------------------------------------------------------------------------------- SYMPTOMS ======== When a CMRCV call is being posted asynchronously the immediate CMRCV response (which returns with CM_OPERATION_INCOMPLETE) is also tracing the buffer. CAUSE ===== If you are writing a CPI-C application, you can define whether you like to use a blocking or nonblocking conversation. In case of a blocking operation, a call will be returned when the requested operation is complete (synchronous call). In the case of a nonblocking call, the call will be returned immediately after the operation is initiated (asynchronous call). In a CPI-C application this can be done using the CPI-C API call Set_Processing_Mode (cmspm) where you can specify the receive Types as CM_BLOCKING or CM_NON_BLOCKING. This indicates that all subsequent calls will be returned either synchronous or asynchronous, accordingly. If you are using asynchronous calls the receive request call, CMRCV will return immediately with a CMRECV response with CM_INCOMPLETE_DATA_RECEIVED. Although the data returned is not complete, the SNA Trace utility is tracing that buffer. This might be confusing when you analyze the CPI-C API traces. With the SNA Applications: CPI-C trace enabled, you may see the following: CPIC CMRCV request CPIC Conversation ID = 01000000 CPIC Requested length = 4096 CPIC Conversation characteristics CPIC Conversation type = CM_MAPPED_CONVERSATION CPIC Fill type = CM_FILL_LL CPIC Receive type = CM_RECEIVE_AND_WAIT CPIC ---------------------------------------------- 13:34:40.23 CPIC CMRCV response, result = CM_OPERATION_INCOMPLETE CPIC ---- Buffer at address 002F27A0 ---- CPIC B8002F00 B8002F00 00000000 00000000 <../.../.........> CPIC 00000000 00000000 00000000 00000000 <................> CPIC 00000000 00000000 00000000 00000000 <................> CPIC 00000000 00000000 00000000 00000000 <................> CPIC 00000000 00000000 00000000 00000000 <................> CPIC Data received type = CM_NO_DATA_RECEIVED CPIC Received length = 6625328 CPIC Status received = ***UNKNOWN STATUS_RECEIVED*** CPIC Request to send received = ***UNKNOWN REQ_TO_SEND TYPE*** The CNMRCV response shows no data. This is also reported in the Data received type field which returns CM_NO_DATA_RECEIVED. STATUS ====== Microsoft has confirmed this to be a problem in Microsoft SNA Server version 2.11 and 2.11.sp1. This problem was corrected in the latest Microsoft SNA Server 2.11 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K Additional query words: prodsna SP1 CPI-C CMRCV ====================================================================== Keywords : kbprogramming Technology : kbAudDeveloper kbSNAServSearch Version : WINDOWS:2.11 SP1 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.