CHAIN command


>>-CHAIN--+------------------------+---------------------------><
          | .-0------.             |   
          '-+--------+--+--------+-'   
            '-offset-'  '-length-'

where:

offset: A hexadecimal offset of the 4-byte pointer to the next link.
length: The length of each element in hexadecimal. The default for length is whatever fits on one line in the current display format.

When you are viewing a linked list, you can use the CHAIN command to view more than one link at a time.

The chain is considered terminated when one of these is found:

A pointer of zero.
A pointer to the first node.
A pointer to unavailable storage.

Entering the CHAIN command a second time turns the chain formatting off.

For example, to see the current ASCB chain, enter ISRDDN and type

B 10.??+C?
CHAIN 4 20

You see a screen similar to Figure 1.

Figure 1. CHAIN Storage Format

 BROWSE    STORAGE  Start:00F90100                    Line 00000001 Col 001 080
      +0 (00F90100)   C1E2C3C2 00F92B80 00F90280 00000000  * ASCB.9.Ï.9.Ï.... *
     +10 (00F90110)   008FD788 00029982 00000000 00000000  * ..Ph..rb........ *

     +30 (00F92B80)   C1E2C3C2 00F98500 00F90100 00000000  * ASCB.9e..9...... *
     +40 (00F92B90)   008FD880 000005B4 00000000 00000000  * ..QÏ...®........ *

     +60 (00F98500)   C1E2C3C2 00F90700 00F92B80 00000000  * ASCB.9...9.Ï.... *
     +70 (00F98510)   008FD598 0000E527 00000000 00000000  * ..Nq..V......... *

     +90 (00F90700)   C1E2C3C2 00F90580 00F98500 00000000  * ASCB.9.Ï.9e..... *
     +A0 (00F90710)   008FD690 00009130 00000000 00000000  * ..O...j......... *

     +C0 (00F90580)   C1E2C3C2 00000000 00F90700 00000000  * ASCB.....9...... *
     +D0 (00F90590)   008FD788 00007EC0 00000000 00000000  * ..Ph..={........ *

******************************** Bottom of Data ********************************




 Command ===> ________________________________________________ Scroll ===> PAGE
  F1=HELP      F2=          F3=END       F4=DATASETS  F5=FIND      F6=CHANGE
  F9=SWAP     F10=LEFT     F11=RIGHT    F12=SUBMIT

In the CHAIN format display, the offsets on the left are the offsets within a particular link followed by the actual address of the start of the line.