centos man page for spi_connect

SPI_CONNECT(3)						  PostgreSQL 9.2.7 Documentation					    SPI_CONNECT(3)

NAME
       SPI_connect - connect a procedure to the SPI manager

SYNOPSIS
       int SPI_connect(void)

DESCRIPTION
       SPI_connect opens a connection from a procedure invocation to the SPI manager. You must call this function if you want to execute commands
       through SPI. Some utility SPI functions can be called from unconnected procedures.

       If your procedure is already connected, SPI_connect will return the error code SPI_ERROR_CONNECT. This could happen if a procedure that has
       called SPI_connect directly calls another procedure that calls SPI_connect. While recursive calls to the SPI manager are permitted when an
       SQL command called through SPI invokes another function that uses SPI, directly nested calls to SPI_connect and SPI_finish are forbidden.
       (But see SPI_push and SPI_pop.)

RETURN VALUE
       SPI_OK_CONNECT
	   on success

       SPI_ERROR_CONNECT
	   on error

PostgreSQL 9.2.7						    2014-02-17							    SPI_CONNECT(3)