System Control Blocks

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o (0) :.::: 4 (4) .,r- Continued Cont!nlJed Continued Continued r.... r60 (3C) 21 (15) 41 (29) 53 (35) 73 (49) Figure 16A. Data Set Label 1 DATA SET LABEL 1 -- FL1 FLILABI Label ID FL 1 FSEC Security 196 OS System control Blocks (Release 21.7) FL liD D a t a S e t ID FLIFILSR Data Set Serial No. FLlCREDT Creation Date FL 1 EXPDT Expiration Date 54 (36) FL lBLKCT Trailer Block Count FL lSYSCD System Code Reserved 3 (3) 27 (I B) 31 (]F) FL lFILSQ Data Set Sequence No. 35 (23) 39 (27) 47 (2F) FLINO Label No. FLIVOLSQ Volume Sequence No. FLlGNO Generation No. FL1VNG Version No. 79 (4F) ..,r _ ... -
Offset o (0) 3 Bytes and Field Alignment Name 3 (3) 1 4 (4) 17 21 (15) • 6 27 (lB) ••• 4 31 (IF) ••• 4 35 (23) ••• 4 39 (27) ••• 2 41 (29) • 6 47 (2F) ••• 6 53 (35) • 1 54 (36) •• 6 60 (3C) 13 73 (49) • 7 FL1LABI FL1NO FL1ID FL1FILSR FL1VOLSQ FL1FILSQ FL1GNO FL1VNG FL1CREDT FL1EXPDT FL1FSEC FL1BLKC'l' FL1SYSCD DATA SET LABEL 1 -- FL1 Hex. Dig. Field Description, Contents, Meaning Label identifier. HDR - header label. EOV - end-of-volume trailer label. EOF - end-of-data set trailer label. Data set label number = 1. Data set identifier. Data set serial number. Same as the code that appears in the VOLSERNO field of the initial volume label of the first or only volume of the data set or multi-data set aggregate. Volume sequence number. Indicates the volume on which the data set is recorded in relation to the volume on which the data set begins. Data set sequence number. Indicates the position of the data set relative to the first data set in a multi-data set aggregate. Generation number of the data set. Version number of a generation of the data set. Creation date. year and day - in format byyddd. b = blank yy = year (00-99) ddd = day (001-366) Expiration date. Expressed in the same format as creation date. Data set security indicator. FO Data set is not security protected. For an ASCII tape, a space indicates that the data set is not security protected. F1 Data set is security protected. For an ASCII tape, any character except 1, 3, or a space prevents any access to the data set. F3 Read without password. Unused in header labels - zero. In trailer labels, the number of tlocks in the data set or on the current volume of a multi-volume data set. System code identifying the programming system. ASCII tapes, created by the IBM System/360 Operating System, will have ·OS360" written in the first (high-order) five tytes of this field. Reserved - must te recorded as spaces. Data Set Label 1 -- FLl 197
Page 1:
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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Page 124:
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
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 188: ...... ---r 0(0) 4 (4) 44 (2C) DS5F
Page 191 and 192: FORMAT 6 -- SHARED EXTENT DATA SET
Page 193 and 194: Data Set Labels -- Magnetic Tape Th
Page 198 and 199: 198 OS system Control Blocks (Relea
Page 200: 0(0) 4 (4) 16 (10) 36 (24) FL2RECFM
Page 203 and 204: Event Control Block The event contr
Page 206: INTERRUPTION CONTROL BLOCR 0(0) ICB
Page 209: 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 238 and 239: JOB STEP CONTROL BLOCK 240 (FO) JSC
Page 240: 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
Page 256 and 257:
Page 263:
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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Page 274:
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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Page 314 and 315:
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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Page 325 and 326:
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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UCS 1403 Printer Extension 0(0) 4 (
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Offset 45 (2D) • 3 48 (30) 8 56 (
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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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