System Control Blocks

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0(0) 8 (8) PROTECTED STEP CONTROL BLOCK PSCBUSER User ID PSCBGPNM Group Name 16 (10) PSCBATRI \18 (12) PSCBATR2 IBM User Attributes Available for Installation 20 (14) PSCBCPU Cumulative CPU Time Used in Session 24 (18) PSCBSWP Cumulative Time Terminal User Resident in Region 28 (1C) PSCBlTIM Time of Day at logon 32 (20) PSCBTCPU 36 (24) PSCBTSWP Total Time User Resident in Region 40 (28) PSCBTCON Total "Connect" Time for User During Accounting Period 44 (2C) PSCBTCOI 48 (30) PSCBRlGB Address of Re-Iogon Buffer 52 (34) PSCBUPT Address of UPT 56 (38) PSCBUPTl length of UPT \ 58 (3A) 60 (3C) PSCBRSZ Requested Region Size 64 (40) Figure 34. Protected Step Control Block PSCBU Available for Installation Use 396 OS System Control Blocks (Release 21.7) 17 (7) Reserved PSCBUSRl 71 (47)
Offset o (0) 7 Byte and Field Alignment Name 1 (1) ••• 1 8 (8) 8 16 (10) 2 18 (12) •• 2 20 (14) 4 24 (18) 4 28 (lC) 4 32 (20) 4 36 (24) 4 40 (28) 4 44 (2C) 4 48 (30) 4 52 (34) 4 56 (38) 2 58 (3A) •• 2 60 (3C) 4 64 (40) 8 PSCBUSER PSCBUSRL PSCBGPNM PSCBATR1 Byte 1 1 ••• • 1 •• .. 1. ••• x xxxx Byte 2 PSCBATR2 PSCBCPU PSCBSWP PSCBLTIM PSCBTCPU PSCBTSWP PSCBTCON PSCBTC01 PSCBRLGB PSCBUPT PSCBUPTL PSCBRSZ PSCBU PROTECTED STEP CONTROL BLOCK Hex. Dig. Field Description, Contents, Meaning Contains the user ID left aligned and followed by blanks if necessary. The length of the non-blank portion of the user ID. Group name initialized by logon from the user attribute data set (UADS). IBM user attributes. PSCBCTRL - OPERATOR command user. PSCBACCT - ACCOUNT command user • PSCBJCL - SUBMIT, STATUS, CANCEL, OUTPUT command user. (Reserved bits) Reserved. Available for use by the installation. The cumulative time used by this terminal user during this session. This field is set to zero during logon. The cumulative time that this terminal user has been resident in the region. This field is set to zero during logon. The actual time of day that this user logged onto the time sharing system for this session. The total CPU time used by this terminal user, excluding the current session. The total time that the terminal user has been resident in the region during this accounting period, excluding the current session. The first four bytes of an eight byte field containing the total ·connect· time for the user during this accounting period, excluding the current session. Note: All times are in 26.04166 microsecond timer units. Second word of PSCBTCON. Address of the re-Iogon buffer block. Address of the user profile table (UPT). Length of the UPT in bytes. Reserved. Requested region size in number of 2K blocks. Available for use by the installation. PSCB 397
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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
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Offset 68 (44) 1 70 (46) •• 2 7
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Offset 101 (65) • 1 101 (65) •
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JOB STEP CONTROL BLOCK 240 (FO) JSC
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240 os System Control Blocks (Relea
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Offset 40 (28) 2 40 (28) 41 (29) 42
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Offset 96 (60) 1 91 (61) • 3 100
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Offset I o (0) 8 8 (8) 3 *tes and ,
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Offset Bytes and Alignment I 24 (18
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Offset Bytes and Field A1ignment Na
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REQUEST BLOCKS -- MVT CONFIGURATION
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Interruption Request Block -- MVT T
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proqram Request Block -- MVT The pr
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Offset o (0) B 8 (8) 1 9 (9) • 1
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Supervisor Request Blocks -- MVT Th
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Supervisor Request Block -- MVT --
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SUPERVISOR REQUEST BLOCK -- MVT --
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302 OS system Control Blocks (Relea
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Offset o 1 2 4 8 (0) 1 Bytes and Fi
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Bytes and Offset Alignment 105 (69)
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1-32 (20) r- L,. 0(0) 4 (4) 8 (8) 1
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Bytes and Field Offset Alignment Na
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1116 (74) 120 (78) 124 (7C) 128 (80
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Offset 31 (IF) 32 (20) Byte and Fie
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Offset 168 (AB) 4 172 (AC) 1 173 (A
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TIMING CONTROL TABLE 0(0) TCTQA 3 (
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Offset o (0) 3 Bytes and Field Alig
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Offset o 4 6 8 10 +0 (0) 4 (4) 2 By
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Offset +3 +4 +12 +15 +0 Bytes and F
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Page 360: Offset 45 (2D) • 3 48 (30) 8 56 (
Page 364: Offset Bytes and Alignment 10 (A)
Page 369 and 370: MAGNETIC TAPE DEVICE CLASS UCBTYP B
Page 371: Byte 1 lOS Flogs I Model Code I UCB
Page 374: UCB + 16 (10) Offset 16 (10) 1 Byte
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Page 381 and 382: ASCII Volume Header Label I 0 (0) 1
Page 383 and 384: Volume Table of Contents The volume
Page 385 and 386: Volume Table of Contents The volume
Page 387 and 388: Time-Sharing Option Control Blocks
Page 389: Driver Parameter Area The driver pa
Page 392: ENVIRONMENT CONTROL TABLE 0(0) ECTR
Page 395: Protected Step Control Block The pr
Page 399: Time-Sharing Job Block The time sha
Page 415 and 416: Indexes to system reference library
Page 417: liO coo.nter table 339 I/O lookup t
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System Control Blocks

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