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CentOS 7.0 - man page for spi_prepare_cursor (centos section 3)

SPI_PREPARE_CURSOR(3)					  PostgreSQL 9.2.7 Documentation				     SPI_PREPARE_CURSOR(3)

SPI_prepare_cursor - prepare a statement, without executing it yet
SPIPlanPtr SPI_prepare_cursor(const char * command, int nargs, Oid * argtypes, int cursorOptions)
SPI_prepare_cursor is identical to SPI_prepare, except that it also allows specification of the planner's "cursor options" parameter. This is a bit mask having the values shown in nodes/parsenodes.h for the options field of DeclareCursorStmt. SPI_prepare always takes the cursor options as zero.
const char * command command string int nargs number of input parameters ($1, $2, etc.) Oid * argtypes pointer to an array containing the OIDs of the data types of the parameters int cursorOptions integer bit mask of cursor options; zero produces default behavior
SPI_prepare_cursor has the same return conventions as SPI_prepare.
Useful bits to set in cursorOptions include CURSOR_OPT_SCROLL, CURSOR_OPT_NO_SCROLL, CURSOR_OPT_FAST_PLAN, CURSOR_OPT_GENERIC_PLAN, and CURSOR_OPT_CUSTOM_PLAN. Note in particular that CURSOR_OPT_HOLD is ignored. PostgreSQL 9.2.7 2014-02-17 SPI_PREPARE_CURSOR(3)