System Control Blocks

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Offset 36 (24) 1 37 (2S) • 1 38 (26) •• 1 Bytes and Field Alignment Name 39 (27) ••• 41 39 (27) 2 41 (29) • 39 FL2CNI'RL FL2BLKA FL2BUFOF DATA SET LABEL 2 -- FL2 Field Description, Contents, Meaning Printer control. This character denotes whether a printer carriage control set was used to create the data set and the type of carriage control specified. A - American National Standard control characters. M - Machine control characters. b - Records do not contain control characters. Reserved. 202 OS System Control Blocks (Release 21.7) Block attribute. B - Blocked records. S Spanned records. R Records are both blocked and spanned. b Records are neither blocked nor spanned. (b - blank) IBM standard tape: Reserved. Must be recorded as spaces. ASCII tape: Length of-optional block prefix. ASCII tape: Reserved. Must be recorded as spaces.
Event Control Block The event control block (ECB) is used for communication between various components of the control program, as well as between processing programs and the control program. An ECB is the subject of WAIT and POST macro instructions. Figure 17 shows the format of the event control block. A description of its fields follows the illustration. Figure 17. Event Control Block Offset +0 +1 Bytes and Field Alignment Name 1 1 ... . 1 .. • • xx xxxx Hex. Dig. Field Description, Contents, Meaning Awaiting completion of an event: W - waiting for completion of an event. After completion of an event: C - The event has completed • completion code • One of the following completion codes will appear at the completion of a channel program: Access Methods Except BTAM and TCAM 7F Channel program has terminated without error. (CSW contents useful.) 41 Channel program has terminated with permanent error. (CSW status bytes useful. CCW address may be useful or zeros.) 42 Channel program has terminated because a access extent address has been violated. contents do not apply.) direct (CSW 44 I/O request was rejected because (1) a device error was detected after the last I/O operation on a local 3270 was posted complete or (2) a request-for-test message was received from a local 3270 display station requesting that a test message be sent to another local 3270 device. 48 Read Initial operation for the local 3270 display system was cancelled because a RESETPL macro instruction was issued. 4B One of the following errors occurred during tape error recovery processing • • The CSW command address in the lOB was zeros • • An unexpected load point was encountered. (CSW contents do not apply in either case.) ECB 203
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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
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 164 and 165: 164 OS System Control Blocks (Relea
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 196 and 197: o (0) :.::: 4 (4) .,r- Continued Co
Page 198 and 199: 198 OS system Control Blocks (Relea
Page 200: 0(0) 4 (4) 16 (10) 36 (24) FL2RECFM
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
Page 245 and 246: 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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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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