System Control Blocks

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PARTITIONED DATA SET DIRECTORY ENTRY - FORMAT 2 This format is received upon issuance of a BLDL macro instruction where the specified members are load modules produced by linkage editor. The user data field for a load module is described here. Figure 23B shows the format of POS directory entries for linkage editor load modules in a BLOL list. Descriptions of the fields follow the illustration. The difference between format 2 and format 1 of linkage editor POS directory entries lies in the concatenation number and library flag fields inserted in format 2 by the BLOL routine at offsets +11 and +12 (decimal). POS - Format 2 265
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Systems Reference Library IBM Syste
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Figures Figure 1A. Pointer Diagram
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System Control Blocks System contro
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. ..J MFT Figure lA. Pointer Diagra
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Contents Directory Entry (MVT Only)
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20 OS System Control Blocks (Releas
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Offset -8 (-8) 2 Bytes and Field Al
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Offset 124 (7C) 4 128 (80) 4 132 (8
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0(0) 4 (4) 8 (8) 12 (c) 16 (10) 20
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DATA CONTROL BLOCK -- SAM Continued
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Offset 53 (35) • 3 56 (38) 1 57 (
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Device Interface 16 (10) Common Int
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Offset 16 (10) 1 11 (11) • 1 18 (
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Offset 40 (28) 8 48 (30) 1 49 (31)
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Offset Bytes and Field Alignment Na
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Device Interface 16 (10) Common Int
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WTTA Interface 16 (10) DCBBQFLG Dat
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Offset 20 (14) 1 21 (15) • 3 24 (
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Offset Bytes and Field Alignment N
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DATA CONTROL BLOCK -- TCAM The form
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Offset 33 (21) • 3 36 (24) 1 37 (
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Offset 52 (34) 1 52 (34) 4 56 (38)
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112 OS System Control Blocks (Relea
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Appendage Table DATA EXTENT BLOCK -
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offset -36 (-24) 4 -32 (-20) 4 -28
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Offset +0 +0 +0 +1 +0 +4 +8 +0 +4 +
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DATA EXTENT BLOCK -- QTAM MESSAGE P
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Offset 48 (30) 4 52 (34) 1 53 (35)
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- 36 (- 24) -32 (-20) -28 (+ lC) -2
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DATA EVENT CONTROL BLOCK -- BSAM Th
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Offset 12 (e) 4 16 (10) 4 20 (14) 4
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DATA EVENT CONTROL BLOCK -- BlSAM T
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o (0) DATA EVENT CONTROL BLOCK -- B
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DATA EVENT CONTROL BLOCK -- QTAM Th
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DATA EVENT CONTROL BLOCK -- BTAM Th
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Offset 28 (lC) 29 (lD) • 1 Bytes
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Device Name Table The device name t
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166 05 System Control Blocks (Relea
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10 (0) ....,r- 44 (2C) DS1FMTID For
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72 (48) FORMAT 2 -- INDEX DATA SET
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Offset 64 (40) 2 Bytes and Alignmen
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FORMAT 3 -- EXTENSION DATA SET CONT
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Offset o (OJ 44 44 (2C) 1 45 (2D)
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...... ---r 0(0) 4 (4) 44 (2C) DS5F
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FORMAT 6 -- SHARED EXTENT DATA SET
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Data Set Labels -- Magnetic Tape Th
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o (0) :.::: 4 (4) .,r- Continued Co
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198 OS system Control Blocks (Relea
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0(0) 4 (4) 16 (10) 36 (24) FL2RECFM
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Event Control Block The event contr
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INTERRUPTION CONTROL BLOCR 0(0) ICB
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Input/Output Block The input/output
Page 214: Offset Bytes and Field Alignment Na
Page 220: Offset Bytes and Field Alignment Na
Page 227 and 228: Offset 68 (44) 1 70 (46) •• 2 7
Page 232: Offset 101 (65) • 1 101 (65) •
Page 236 and 237: 236 OS System Control Blocks (Relea
Page 238 and 239: JOB STEP CONTROL BLOCK 240 (FO) JSC
Page 240: 240 os System Control Blocks (Relea
Page 245 and 246: Offset 40 (28) 2 40 (28) 41 (29) 42
Page 253 and 254: Offset 96 (60) 1 91 (61) • 3 100
Page 263: Offset I o (0) 8 8 (8) 3 *tes and ,
Page 269 and 270: Request Blocks Request blocks are u
Page 271: REQUEST BLOCR -- MFT CONFIGURATIONS
Page 276 and 277: Offset 12 (e) 4 12 (e) 1 13 (D) •
Page 282: INTERRUPTION REQUEST BLOCK -- MVT 0
Page 288: 288 os system Control Blocks (Relea
Page 292 and 293: 292 OS system Control Blocks (Relea
Page 296 and 297: 0(0) SUPERVISOR REQUEST BLOCK -- MV
Page 298: 298 OS System Control Blocks (Relea
Page 304: SYSTEM MANAGEMENT CONTROL AREA 0(0)
Page 308 and 309: Offset Bytes and Field Alignment Na
Page 310: 310 OS System Control Blocks (Relea
Page 313 and 314: Task Control Block -- MFf Figure 26
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1116 (74) 120 (78) 124 (7C) 128 (80
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Offset 28 (lC) 1 29 (10) • 5 29 (
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Task Control Block -- MVT Figure 26
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Byte and Field Offset Alignment Nam
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Offset 33 (21) Byte and Alignment 3
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Timing Control Table The timing con
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Processor Storage Table I +0(0) +4(
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Offset +0 +2 +3 +4 +0 4 +4 1 +5 •
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346 as System Control Blocks (Relea
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Offset 24 (18) 4 Bytes and Field Al
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Offset 152 (98) 16 16S (AS) 16 184
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Offset 16 (10) 11 (11) 18 (12) 19 (
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DIRECT ACCESS STORAGE DEVICE CLASS
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Offset Bytes and Alignment 24 (18)
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Offset Bytes and Alignment COMMUNIC
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Volume Label A volume label is 80 c
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VTOC Data Set User Label Extent* or
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Environment Control Table The envir
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394 os System Control Blocks (Relea
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0(0) 8 (8) PROTECTED STEP CONTROL B
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Offset 26 (lA) •• 1 Byte and Fi
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Time-Sharing Interface Area The tim
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User Profile Table The user profile
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data event control block 137 BDAM 1
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IBM System/360 Operating System: GC
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System Control Blocks

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