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ROPE Language Reference - "greg"

The "greg" action returns a reference to one of the available global registers (greg stands for "global register"). It takes an integer value off the stack and returns a reference to the numbered global integer register. You can use this reference to get or put their values.

Rope "global registers" are integer registers who's values are available to all Rope scripts (ie "public") via the "greg" action, and to "user" mode programs via files in the /proc file system. The values are not reset between Rope script executions.

Note that..

• Rope global registers can only contain integer values.
• Rope global registers are numbered from 1 to a configurable maximum (default is 20).
• The maximum available greg index value can be read from greg(0).
• Global registers are represented as files in the directory /proc/net/ipt_rope/gregs.
• The file names in the directory are the greg index values.
• The number of digits in the file names depends on the configued number of gregs.
  • If you configured 7 gregs, their names will be "0" to "7"
  • If you configured 72 gregs, their names will be "00" to "72".
  • If you configured 256 gregs, their names will be "000" to "256"

Getting A Global Register Value

To get the contents of global register number 5..

5 greg get print
greg(5) get print
greg(5) print

The last of these examples works because many of Rope's actions (including print) execute an implied get when they are passed a register reference.

Setting A Global Register Value

To setthe value of global register number 5 to value 29, use one of..

put( 29 greg(5) )
29 greg(5) put
29 5 greg put

Change History

The "greg" action is not available in Rope versions before 20050101 (Jan 2005).

See Also

get, put, reg

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