System Control Blocks

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Offset Bytes and Alignment I 24 (18) •• 3 27 (lB) ••• 2 29 (10) • 3 32 (20) 3 35 (23) ••• 3 38 (26) •• 8 35 (23) ••• 2 37 (25) • 2 39 (27) ••• 2 III (29) • 2 43 (2B) ••• 3 46 (2E) •• 8 Main Storage PDS DIRECTORY ENTRY Field Description, Contents, Meaning User Data Field (Continued) Total contiguous main storage requirement of module. First Text Block Length Length of the first block of text. EP Address Entry pOint address associated with member name or with alias name if the alias indicator is on. First Text Block Origin Linkage editor assigned origin of the first block of text. EP-Member Name LOAD MODULE -- ALIAS NAME AND RENT OR REUS· ATTRIBUTE The entry point associated with the member name when the first field is an alias name and the load module has reenterable or reusable attributes. Member Name The member name of the load module when the first field is an alias name and the load module has reenterable or reusable attributes. Scatter List Size LOAD MODULE -- SCATTER Number of bytes in the scatter list. Transl-Table Size Number of bytes in the translation table. ESDID-T Identification of the ESD item (ESDID) of the control section to which the first block of text belongs. ESDID-CSECT Identification of the ESD item (ESDID) of the control section containing the entry point. LOAD MODULE -- SCATTER, WITH ALIAS NAME AND RENT OF REUS ATTRIBUTE EP-Member Name The entry point associated with the member name when the first field is an alias name and the load module has reenterable or reusable attributes. Member Name The member name of the load module when the first field is an alias name and the load module has reenterable or reusable attributes. 268 05 System Control Blocks (Release 21.7)
Request Blocks Request blocks are used by the supervisor for maintaining information concerning programs and routines (logically distinct sections of code). Other components of the control program may create request blocks and/or refer to information in them. The various request blocks are shown and described separately as follows: • MFT Configuration -- LPRB,LRB,PRB,FRB,IRB,SIRB,SVRB: Figure 24A and following text • MVT Configuration -- IRB: Figure 24B and following text PRB: Figure 24C and following text SIRB: Figure 240 and following text SVRB -- Resident SVC Routines: Figure 24E and following text Transient SVC Routines: Figure 24F and following text RB 269
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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 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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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) •
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Page 238 and 239: JOB STEP CONTROL BLOCK 240 (FO) JSC
Page 240: 240 os System Control Blocks (Relea
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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 274: Offset Bytes and Field A1ignment Na
Page 277 and 278: Offset Bytes and Field Alignment Na
Page 279 and 280: REQUEST BLOCKS -- MVT CONFIGURATION
Page 281 and 282: Interruption Request Block -- MVT T
Page 285: proqram Request Block -- MVT The pr
Page 291 and 292: Offset o (0) B 8 (8) 1 9 (9) • 1
Page 293 and 294: Supervisor Request Blocks -- MVT Th
Page 295 and 296: Supervisor Request Block -- MVT --
Page 297 and 298: SUPERVISOR REQUEST BLOCK -- MVT --
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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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UCS 1403 Printer Extension 0(0) 4 (
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Offset Bytes and Alignment 10 (A)
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MAGNETIC TAPE DEVICE CLASS UCBTYP B
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Byte 1 lOS Flogs I Model Code I UCB
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UCB + 16 (10) Offset 16 (10) 1 Byte
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ASCII Volume Header Label I 0 (0) 1
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Volume Table of Contents The volume
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Volume Table of Contents The volume
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Time-Sharing Option Control Blocks
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Driver Parameter Area The driver pa
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ENVIRONMENT CONTROL TABLE 0(0) ECTR
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Protected Step Control Block The pr
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Offset o (0) 7 Byte and Field Align
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Time-Sharing Job Block The time sha
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Indexes to system reference library
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liO coo.nter table 339 I/O lookup t
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System Control Blocks

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