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Two kinds of subprograms are allowed in the configuration language. A main procedure is used as a partition Main attribute and a function is used as a partition Host attribute.
PROCEDURE_DECLARATION ::=
procedure PROCEDURE_IDENTIFIER;
FUNCTION_DECLARATION ::=
function FUNCTION_IDENTIFIER
(PARAMETER_IDENTIFIER : [in] String)
return String;
The function can be an Ada function (default) or a shell script. To import a shell script, the pragma Import must be used:
PRAGMA ::=
pragma Import
([Entity =>] FUNCTION_IDENTIFIER,
[Convention =>] CONVENTION_LITERAL,
[External_Name =>] STRING_LITERAL);
pragma Import (Best_Node, Shell, "best-node");
In this case, the PCS invokes the shell script with the partition name as a command line argument. The shell script is supposed to return the partition host-name (see Partition Attribute Host).