postgres_ext.h

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+/*-------------------------------------------------------------------------
+ *
+ * postgres_ext.h
+ *
+ *	   This file contains declarations of things that are visible everywhere
+ *	in PostgreSQL *and* are visible to clients of frontend interface libraries.
+ *	For example, the Oid type is part of the API of libpq and other libraries.
+ *
+ *	   Declarations which are specific to a particular interface should
+ *	go in the header file for that interface (such as libpq-fe.h).	This
+ *	file is only for fundamental Postgres declarations.
+ *
+ *	   User-written C functions don't count as "external to Postgres."
+ *	Those function much as local modifications to the backend itself, and
+ *	use header files that are otherwise internal to Postgres to interface
+ *	with the backend.
+ *
+ * $PostgreSQL: pgsql/src/include/postgres_ext.h,v 1.16 2004/08/29 05:06:55 momjian Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef POSTGRES_EXT_H
+#define POSTGRES_EXT_H
+
+/*
+ * Object ID is a fundamental type in Postgres.
+ */
+typedef unsigned int Oid;
+
+#ifdef __cplusplus
+#define InvalidOid		(Oid(0))
+#else
+#define InvalidOid		((Oid) 0)
+#endif
+
+#define OID_MAX  UINT_MAX
+/* you will need to include <limits.h> to use the above #define */
+
+
+/*
+ * NAMEDATALEN is the max length for system identifiers (e.g. table names,
+ * attribute names, function names, etc).  It must be a multiple of
+ * sizeof(int) (typically 4).
+ *
+ * NOTE that databases with different NAMEDATALEN's cannot interoperate!
+ */
+#define NAMEDATALEN 64
+
+
+/*
+ * Identifiers of error message fields.  Kept here to keep common
+ * between frontend and backend, and also to export them to libpq
+ * applications.
+ */
+#define PG_DIAG_SEVERITY		'S'
+#define PG_DIAG_SQLSTATE		'C'
+#define PG_DIAG_MESSAGE_PRIMARY 'M'
+#define PG_DIAG_MESSAGE_DETAIL	'D'
+#define PG_DIAG_MESSAGE_HINT	'H'
+#define PG_DIAG_STATEMENT_POSITION 'P'
+#define PG_DIAG_INTERNAL_POSITION 'p'
+#define PG_DIAG_INTERNAL_QUERY	'q'
+#define PG_DIAG_CONTEXT			'W'
+#define PG_DIAG_SOURCE_FILE		'F'
+#define PG_DIAG_SOURCE_LINE		'L'
+#define PG_DIAG_SOURCE_FUNCTION 'R'
+
+#endif