System Control Blocks

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...... ---r 0(0) 4 (4) 44 (2C) DS5FMTlD Format Identifier FORMAT 5 -- FREE SPACE DATA SET CONTROL BLOCK 9 (9) 45 (2D) DS5KEYID Key ID DS5AVEXT An Available Extent DS5AVEXT 7 More Avai lable Extents DS5MAVET 18 More Avai lable Extents DS5PTRDS Direct-Access Address of Next Format 5 DSCS Figure 15E. Format 5 -- Free Space Data Set Control Block 188 OS System Control Blocks (Release 21.7) 135 (87) 139 (8S) .j ....
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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
Page 136: 136 OS System Control Blocks (Relea
Page 139 and 140: DATA EVENT CONTROL BLOCK -- BSAM Th
Page 141 and 142: Offset 12 (e) 4 16 (10) 4 20 (14) 4
Page 143 and 144: DATA EVENT CONTROL BLOCK -- BlSAM T
Page 146 and 147: 146 OS System Control Blocks (Relea
Page 148: o (0) DATA EVENT CONTROL BLOCK -- B
Page 151 and 152: DATA EVENT CONTROL BLOCK -- QTAM Th
Page 153 and 154: DATA EVENT CONTROL BLOCK -- BTAM Th
Page 157 and 158: Offset Bytes and Field Alignment Na
Page 159 and 160: Offset 28 (lC) 29 (lD) • 1 Bytes
Page 161: Device Name Table The device name t
Page 166 and 167: 166 05 System Control Blocks (Relea
Page 168: 10 (0) ....,r- 44 (2C) DS1FMTID For
Page 177 and 178: 72 (48) FORMAT 2 -- INDEX DATA SET
Page 179 and 180: Offset 64 (40) 2 Bytes and Alignmen
Page 181 and 182: FORMAT 3 -- EXTENSION DATA SET CONT
Page 185 and 186: Offset o (OJ 44 44 (2C) 1 45 (2D)
Page 192 and 193: FORMAT 6 -- SHARED EXTENT DATA SET
Page 194: 194 OS System Control Blocks (Relea
Page 197 and 198: Offset o (0) 3 Bytes and Field Alig
Page 199 and 200: DATA SET LABEL 2 -- FL2 Data set la
Page 202 and 203: Offset 36 (24) 1 37 (2S) • 1 38 (
Page 204: Offset +1 Bytes and Field Alignment
Page 208 and 209: Offset 16 (10) 7 17 (11) • 7 24 (
Page 212: INPUT/OUTPUT BLOCK Extension (Conti
Page 216: Offset 28 (lC) 1 29 (lC) • 1 28 (
Page 222: Offset 51 (33) 52 (34) 4 56 (38) 2
Page 228: Offset 79 (4F) 80 (50) 3 Bytes and
Page 234: Offset 113 (71) • 1 114 (72) •
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Job Step Control Block The job step
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Offset 240 (FO) 3 243 (F3) .1 244 (
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LINE CONTROL BLOCK Line Control Blo
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Offset 72 (48) 4 76 (4C) 2 78 (4E)
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254 05 System Control Blocks (Relea
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PARTITIONED DATA SET DIRECTORY ENTR
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PARTITIONED DATA SET DIRECTORY ENTR
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Request Blocks Request blocks are u
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REQUEST BLOCR -- MFT CONFIGURATIONS
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Offset 12 (e) 4 12 (e) 1 13 (D) •
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INTERRUPTION REQUEST BLOCK -- MVT 0
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288 os system Control Blocks (Relea
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292 OS system Control Blocks (Relea
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0(0) SUPERVISOR REQUEST BLOCK -- MV
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SYSTEM MANAGEMENT CONTROL AREA 0(0)
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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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