System Control Blocks

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DATA CONTROL BLOCK -- TCAM The format of a telecommunication access method (TCAM) data control block is determined by the character of the data set it represents. The five types of DCBs used in TCAM message control programs and application programs are as follows: • Line Groups • Message Queues • Checkpoint Data Set • Message Logging • 'Application Programs The three segments of a TCAM DCB and their uses, described and shown in Figure 11 are: Prefix Segment • Line Group Interface • Message Queue Interface • Checkpoint Data Set Interface Foundation Segment • Before OPEN • After OPEN Extension Segment • Line Group Extension • Message Queues/Checkpoint Extension DCB -- TCAM 103
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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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Page 62: Device Interface 16 (10) Common Int
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Page 68 and 69: Offset 40 (28) 8 48 (30) 1 49 (31)
Page 70 and 71: Offset Bytes and Field Alignment Na
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Page 84: WTTA Interface 16 (10) DCBBQFLG Dat
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Page 111 and 112: Data Extent Blocks There are two ki
Page 113 and 114: DATA EXTENT BLOCK -- ORDINARY The d
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Page 140 and 141: 0(0) DATA EVENT CONTROL BLOCK -- BS
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Bytes and Offset Alignment 6 (6) .
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DATA EVENT CONTROL BLOCK -- QTAM 0(
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0(0) 4 (4) 8 (8) 12 (C) DATA EVEN!'
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Offset 28 (1C) Bytes and Field Alig
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Offset Bytes and Field Alignment Na
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Offset o (0) 4 +0 8 +8 +8 4 +8 2 By
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Data Set Control Blocks The data se
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FORMAT 1 -- IDENTIFIER DATA SET CON
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Offset o (0) 44 44 (2C) 1 45 (20)
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FORMAT 2 -- INDEX DATA SF!' CONTROL
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1 Offset o 1 8 13 20 25 36 (0) 1 By
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180 OS System control Blocks (Relea
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44 (2C) DS3FMTlD Format Identifier
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Offset Bytes and Alignment (44) 2 D
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190 OS System Control Blocks (Relea
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FORMAT 6 -- SHARED EXTENT DATA SET
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Offset o (0) 3 Bytes and Field Alig
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DATA SET LABEL 2 -- FL2 Data set la
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Offset 36 (24) 1 37 (2S) • 1 38 (
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Offset +1 Bytes and Field Alignment
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Offset 16 (10) 7 17 (11) • 7 24 (
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INPUT/OUTPUT BLOCK Extension (Conti
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Offset 28 (lC) 1 29 (lC) • 1 28 (
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Offset 51 (33) 52 (34) 4 56 (38) 2
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Offset 79 (4F) 80 (50) 3 Bytes and
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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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