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| Message Exit not being modified by CHAD exit |
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| cj930736 |
 Posted: Fri Aug 23, 2013 12:44 am Post subject: Message Exit not being modified by CHAD exit |
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Newbie
Joined: 23 Aug 2013
Posts: 3
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Hi All,
I have written a channel exit in C and the part of it which deals with manually overriding the MsgExit parameter is as follows:-
typedef struct USEREXIT
{
char ExitName[MQ_EXIT_NAME_LENGTH];
} USEREXIT, *PUSEREXIT;
typedef struct USERDATA
{
char ExitData[MQ_EXIT_DATA_LENGTH];
} USERDATA, *PUSERDATA;
USEREXIT userexit[3];
USERDATA userdata[3];
case MQXT_CHANNEL_AUTO_DEF_EXIT :
if (pChannelExitParms->ExitReason==MQXR_AUTO_CLUSSDR)
{
strncpy(userexit[0].ExitName,exitvalue,20);
memset(userdata[0].ExitData,' ',MQ_EXIT_DATA_LENGTH);
pChannelDefinition->MsgExitsDefined = 1;
pChannelDefinition->MsgExitPtr = (char *)userexit[0].ExitName;
pChannelDefinition->MsgUserDataPtr = (char *)userdata[0].ExitData;
memset(userdata[1].ExitData,' ',MQ_EXIT_DATA_LENGTH);
pChannelDefinition->ReceiveExitsDefined = 0;
pChannelDefinition->ReceiveExitPtr = NULL;
pChannelDefinition->ReceiveUserDataPtr = (char *)userdata[1].ExitData;
memset(userdata[2].ExitData,' ',MQ_EXIT_DATA_LENGTH);
pChannelDefinition->SendExitsDefined = 0;
pChannelDefinition->SendExitPtr = NULL;
pChannelDefinition->SendUserDataPtr = (char *)userdata[2].ExitData;
pChannelExitParms->ExitResponse = MQXCC_OK;
fprintf(hLdebug, "(1)MsgExitsPtr has the value: %s\n", pChannelDefinition -> MsgExitPtr );
}
Now, the code is working to the extent that MsgExitPtr conatains the value "msglogger(msglogger)" but the message exit branch of the switch statement doesn't appear to be being invoked when a message is put through the channel.
To give the issue some context, I have several queue managers in a cluster, some on Unix and some on Mainframe. When the cluster sender channel on a UNIX queue manager is auto defined based on a CLUSRCVR channel on a mainframe, the MsgExit parameter will be blank and I need to populate it with "msglogger(msglogger)".
Any help on this would be much appreciated... 
Chris. |
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| gbaddeley |
| Posted: Sun Aug 25, 2013 4:37 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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USEREXIT userexit[3];
USERDATA userdata[3];
Where do you allocate memory for this data? It needs to be in a persistent location that MQ internal code can access over the life of the channel instance.
_________________
Glenn |
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| cj930736 |
| Posted: Mon Aug 26, 2013 11:28 pm Post subject: |
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Newbie
Joined: 23 Aug 2013
Posts: 3
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Hi,
Thanks for the response. Sof I use the malloc command to allocate memory for userdata and userexit, this should work?
Chris. |
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| cj930736 |
| Posted: Tue Aug 27, 2013 12:20 am Post subject: |
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Newbie
Joined: 23 Aug 2013
Posts: 3
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Does anyone have an example of a channel auto definition exit (written in C), I could have a look at?
Chris |
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| bruce2359 |
| Posted: Tue Aug 27, 2013 3:54 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Go to google. Search for 'mq chad exit sample'.
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I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| gbaddeley |
| Posted: Tue Aug 27, 2013 3:07 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| cj930736 wrote: |
Hi,
Thanks for the response. Sof I use the malloc command to allocate memory for userdata and userexit, this should work?
Chris. |
malloc() can be used in MQ exits, but make sure you store the pointer in a safe place, and call free() when the channel instance terminates.
Always test pointers for non-null values before using them.
_________________
Glenn |
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| JenniferBroodman |
| Posted: Thu Aug 29, 2013 8:45 pm Post subject: |
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Newbie
Joined: 29 Aug 2013
Posts: 2
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Great Thanks for the reply..... |
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| RogerLacroix |
| Posted: Tue Sep 03, 2013 10:20 am Post subject: Re: Message Exit not being modified by CHAD exit |
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Jedi Knight
Joined: 15 May 2001
Posts: 3264
Location: London, ON Canada
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| cj930736 wrote: |
| Now, the code is working to the extent that MsgExitPtr conatains the value "msglogger(msglogger)" but the message exit branch of the switch statement doesn't appear to be being invoked when a message is put through the channel. |
That's because you are using the "Ptr" variables incorrectly. Somewhere around here, I posted a thing on exit programming requiring expert knowledge of both MQ and C programming.
Can I ask you how much time you have spent on creating a CHAD exit?
Regards,
Roger Lacroix
Capitalware Inc.
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