src/include/postgres_ext.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * postgres_ext.h
   4  *
   5  *         This file contains declarations of things that are visible everywhere
   6  *      in PostgreSQL *and* are visible to clients of frontend interface libraries.
   7  *      For example, the Oid type is part of the API of libpq and other libraries.
   8  *
   9  *         Declarations which are specific to a particular interface should
  10  *      go in the header file for that interface (such as libpq-fe.h).  This
  11  *      file is only for fundamental Postgres declarations.
  12  *
  13  *         User-written C functions don't count as "external to Postgres."
  14  *      Those function much as local modifications to the backend itself, and
  15  *      use header files that are otherwise internal to Postgres to interface
  16  *      with the backend.
  17  *
  18  * $PostgreSQL$
  19  *
  20  *-------------------------------------------------------------------------
  21  */
  22
  23 #ifndef POSTGRES_EXT_H
  24 #define POSTGRES_EXT_H
  25
  26 /*
  27  * Object ID is a fundamental type in Postgres.
  28  */
  29 typedef unsigned int Oid;
  30
  31 #ifdef __cplusplus
  32 #define InvalidOid              (Oid(0))
  33 #else
  34 #define InvalidOid              ((Oid) 0)
  35 #endif
  36
  37 #define OID_MAX  UINT_MAX
  38 /* you will need to include <limits.h> to use the above #define */
  39
  40
  41 /*
  42  * Identifiers of error message fields.  Kept here to keep common
  43  * between frontend and backend, and also to export them to libpq
  44  * applications.
  45  */
  46 #define PG_DIAG_SEVERITY                'S'
  47 #define PG_DIAG_SQLSTATE                'C'
  48 #define PG_DIAG_MESSAGE_PRIMARY 'M'
  49 #define PG_DIAG_MESSAGE_DETAIL  'D'
  50 #define PG_DIAG_MESSAGE_HINT    'H'
  51 #define PG_DIAG_STATEMENT_POSITION 'P'
  52 #define PG_DIAG_INTERNAL_POSITION 'p'
  53 #define PG_DIAG_INTERNAL_QUERY  'q'
  54 #define PG_DIAG_CONTEXT                 'W'
  55 #define PG_DIAG_SOURCE_FILE             'F'
  56 #define PG_DIAG_SOURCE_LINE             'L'
  57 #define PG_DIAG_SOURCE_FUNCTION 'R'
  58
  59 #endif