System Control Blocks

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Offset Bytes and Field Alignment Name 56 (38) 4 SMCAWECB 60 (3C) 4 SMCABECB 64 (40) 4 SMCASGWR 68 (44) 4 SMCASGFT 72 (48) 8 SMCAWAIT 81 (51) • 1 82 (52) •• 1 83 (53) ••• 1 84 (54) 4 88 (58) 4 92 (5C) 4 96 (60) 8 104 (68) 1 SYSTEM MANAGEMENT CONTROL AREA Field Description, Contents, Meaning End of SMF Data Set Descriptions ECB for the SMF writer. ECB for the SMF buffer. If the logical record exceeds 1/2 the buffer size, this field indicates the number of buffer loads required to accommodate the record. The number of record segments (buffer loads) that will fit in the data set. The accumulated wait time, expressed in timer units. SMCAENDI A communication field. 00 Data set (X or Y) was found. 01 Data set (X or Y) was not found. SMCAENOP SMCAFOPT 1 ..• • 1 •• • .1. · .• 1 .1 .. · .1. · .. 1 SMCAWRTP SMCAXCTL SMCAXNAM SMCASWA • 1 •• • .1. ••• 1 x ••• 1 ••• • 1 .. • .1. ••• 1 An entry code that indicates which load of the SVC 83 has passed control to the current load. Contains SMF foreground options. Job accounting (OPT=l). Step accounting (OPT=2) • User exits will be taken (EXT=YES). Data set accounting (DSV=2 or 3). Volume accounting (DSV=l or 3). Tape error statistics by volume (ESV) accounting to be included in SMF record types 14 and 15 for tape data sets (REC=l or 3). Type 17 records maintained for temporary data sets (REC=2 or 3). SMCAFGND - Always set to 1 indicating that these are foreground options. Reserved. An optimum buffer load displacement figure. When the buffer is loaded to or beyond this point, it will be written to the SMF data set. Address of the name of the routine to which XCTL is to pass control. DCB pointer. Always zero according to the XCTL macro instruction format. Name of the routine to which XCTL is to pass control. Indicator l::its. 308 OS System Control Blocks (Release 21.7) Both data sets are full; SMF is not recording • OPEN failure on SMF data set. SMF is not recording. Next allocation must be for a direct access device • Allocation search is by volume serial number. SMF halt-end-of-day is processing • Entry to the writer is for a space check of the data set. Entry to the writer is for data set switching only • Reserved.
Bytes and Offset Alignment 105 (69) . 1 106 (6A) . • 1 101 (6B) . 1 108 (6C) 8 116 (14) 4 120 (18) 2 122 (1A) • 2 SYSTEM Field Hex. Name Dig. SMCASWB SMCASWC SMCASWD SMCADSTM SMCADSCT SMCATJID MANAGEMENT CONTROL AREA Field Description, Contents, Meaning End of SMF Data Set Descriptions (Continued) Reserved. Reserved. Reserved. Start time and date at which no data set was available to record on. Appears in packed decimal in the form OOYYDDDF where: 00 = zeros YY = last 2 digits of the year DDDF = day of the year, F is a sign. The number of SMF records that have been omitted from the SMF data set due to the unavailability of a data set to record on. Reserved. Time-sharing job ID (TJID) of the task that is waiting for its SMF buffer to be written. SMCA 309
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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
Page 256 and 257: 256 OS System Control Blocks (Relea
Page 263: Offset I o (0) 8 8 (8) 3 *tes and ,
Page 268 and 269: Offset Bytes and Alignment I 24 (18
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 --
Page 302: 302 OS system Control Blocks (Relea
Page 306: Offset o 1 2 4 8 (0) 1 Bytes and Fi
Page 314 and 315: 1-32 (20) r- L,. 0(0) 4 (4) 8 (8) 1
Page 316 and 317: Bytes and Field Offset Alignment Na
Page 325 and 326: 1116 (74) 120 (78) 124 (7C) 128 (80
Page 328 and 329: Offset 31 (IF) 32 (20) Byte and Fie
Page 331: Offset 168 (AB) 4 172 (AC) 1 173 (A
Page 334 and 335: TIMING CONTROL TABLE 0(0) TCTQA 3 (
Page 337 and 338: Offset o (0) 3 Bytes and Field Alig
Page 339 and 340: Offset o 4 6 8 10 +0 (0) 4 (4) 2 By
Page 344: Offset +3 +4 +12 +15 +0 Bytes and F
Page 352: 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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