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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).