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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.
+ *
+ * src/include/postgres_ext.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef POSTGRES_EXT_H
+#define POSTGRES_EXT_H
+
+#include "pg_config_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 */
+
+/* Define a signed 64-bit integer type for use in client API declarations. */
+typedef PG_INT64_TYPE pg_int64;
+
+
+/*
+ * 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_SEVERITY_NONLOCALIZED 'V'
+#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_SCHEMA_NAME 's'
+#define PG_DIAG_TABLE_NAME 't'
+#define PG_DIAG_COLUMN_NAME 'c'
+#define PG_DIAG_DATATYPE_NAME 'd'
+#define PG_DIAG_CONSTRAINT_NAME 'n'
+#define PG_DIAG_SOURCE_FILE 'F'
+#define PG_DIAG_SOURCE_LINE 'L'
+#define PG_DIAG_SOURCE_FUNCTION 'R'
+
+#endif /* POSTGRES_EXT_H */