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Robert Sample
Senior Member
Joined: 06 Jun 2008
Posts: 941
Location: Atlanta, GA
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From the Authorized Assembler Services Guide with emphasis added by me:
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25.1 An Allocation Overview
Allocation is the process by which the system assigns, or allocates, I/O resources to your job. An I/O resource is a ddname-data set combination, with any associated volumes and devices. |
And further from the same manual:
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25.2.2.7 Considerations When Requesting Dsname or Pathname Allocation
The following topics describe how the system processes your dsname allocation request based on the attributes of your allocation environment and your request.
| Allowing the System to Generate a Ddname: If you do not specify a ddname,
| the system generates one. The ddname created consists of the characters
| 'SYS' followed by five digits, with a maximum value of SYS65535. |
You're getting a DDNAME whether or not you wanted one, whether or not you asked for one. The first quote says you cannot do a dynamic allocation without using a DDNAME. The second quote tells you what the DDNAME will be if you don't specify one.
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| There is being no DD name returnd, and why should there? |
The answer to your question is because it will be created by the system as part of dynamic allocation -- period. |
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Pankaj Gupta
New User
Joined: 07 May 2008
Posts: 32
Location: Bangalore
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Thank you. Ok. So a DD is returned if I do not specify one. That will be ok but in the block where is returnd the DD name I am seeing just spaces. Unless in the assembler language I need to be doing something different to be seeing what SVC 99 has returned.
Is there being a special way of seeing the values returned after such a call as this? |
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Robert Sample
Senior Member
Joined: 06 Jun 2008
Posts: 941
Location: Atlanta, GA
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| Since you haven't shown any code, it's pretty much impossible to say what's going on. However, the manual is quite clear -- a DDNAME is allocated, so presumably the DDNAME is available somewhere. I would recommend passing a DDNAME to the dynamic allocation routine, and once you get the zero return code perhaps forcing a dump to find out where that name is stored. |
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dick scherrer
Global Moderator
Joined: 23 Nov 2006
Posts: 8729
Location: 221 B Baker St
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Hello,
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| I am providing no DD name because the cod eis being for returning a DD name. |
Maybe we are looking at different code. . . The code i looked at specified DD name.
Please post the part of your code that refers to ddname. When posting code, use the "Code" tag for readability. |
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Pankaj Gupta
New User
Joined: 07 May 2008
Posts: 32
Location: Bangalore
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This is the code with the 8 chars for the DD name:
| Code: |
*
RBLEN EQU (S99RBEND-S99RB)
DSNTU DC AL2(DALDSNAM)
DC X'0001'
DC X'000C'
DC C'SWD.TEAMG.SKELS'
STATUSTU DC AL2(DALSTATS)
DC X'0001'
DC X'0001'
DC X'08'
RETDDN DC AL2(DALRTDDN)
DC X'0001'
DC X'0008'
DS 8X
IEFZB4D0
IEFZB4D2
* |
How I am querying these 8 characters after the SVC 99 call I am not being sure. |
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Bill Dennis
Senior Member
Joined: 17 Aug 2007
Posts: 313
Location: Iowa, USA
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| You can specify your desired DDNAME when doing dynamic allocation. Include in your SVC99 parameter list the correct text unit and options. |
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Pankaj Gupta
New User
Joined: 07 May 2008
Posts: 32
Location: Bangalore
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| Yes, thank you. But can you be shedding daylight upon this? Sometimes it is esier to understand an example than to invent another time the wheel. |
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