File Information Data Structure Support

The File Information Data structure (INFDS) for an ASNA Wings handled workstation file contains the following feedback information.

Feedback Information	From-To positions	Length
File Feedback	1-80	80
Open Feedback	81-240	160
Input/Output Feedback	241-366	126
Device Specific Feedback	367-405	38

RPG manages the File Feedback directly but the following tables specify the level of support provided by ASNA Wings for the last three feedback areas.

Open Feedback Area

The Open Feedback area occupies positions 81-240 of the INFDS. For a detailed explanation of each field, please see IBM's documentation:

Offset	Length	Contents	Support
0	2	Open data path (ODP) type.	Yes - Always 'DS'
2	10	Name of the file being opened.	Yes
12	10	Name of the library containing the file.	Yes
22	22	N/A
44	2	Maximum record length.	Yes
46	20	N/A
66	2	File type.	Yes - Always 1
		Display File
68	3	N/A
71	2	Number of lines on a display screen.	Yes
73	2	Number of positions on a display.	Yes
75	30	N/A
105	2	Maximum number of records that can be read or written in a block when using blocked record I/O.	Yes
107	2	N/A
109	2	Blocked record I/O record increment.	Yes
111	4	N/A
115	1	Miscellaneous flags.	Yes
116	10	Name of the requester device.	Yes
126	2	File open count.	Yes
128	4	N/A
132	1	Miscellaneous flags.	Yes (Bits 5 & 6)
133	2	Open identifier.	Yes
135	4	N/A
139	1	Miscellaneous flags.	Partial - Only Bit 4
140	6	N/A
146	2	Number of devices defined for this ODP.	No - Always 0
148	12	Device name definition list.	No

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Input/Output Feedback Area

The Input/Output Feedback area occupies positions 241-366 of the INFDS. For a detailed explanation of each field, please see IBM's documentation:

Offset	Length	Contents	Supported
0	2	Offset to file-dependent feedback area.	Yes - Always 144
2	4	Write operation count.	Yes
6	4	Read operation count.	Yes
10	4	Write-read operation count.	Yes
14	4	Other operation count.	Yes
18	1	Reserved.
19	1	Current operation.	Yes
20	10	Name of the record format just processed.	Yes
30	2	Device class.	Yes - Always Hex 0145
		3477-FC Display Station
32	10	Device name.	Yes
42	4	Length of the record processed by the last I/O operation.	Yes
46	80	N/A

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Device Specific Feedback Area

The Device Specific Feedback area occupies positions 367-405 of the INFDS. For a detailed explanation of each field, please see IBM's documentation:

Offset	Length	Contents	Supported
0	2	Flag bits.	No
2	1	Attention indicator byte (AIB). This field identifies which function key was pressed.	Yes
3	2	Cursor location (line and position).	Yes
5	4	Actual data length.	Yes
9	2	Relative record number of a subfile record.	Yes
11	2	Lowest subfile.	No
13	2	Total number of records in a subfile.	Yes
15	2	Cursor location (line and position) within active window.	No
17	17	N/A
34	2	Major return code.	Yes
36	2	Minor return code.	Yes

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