src/libpq/include/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