PostgreSQL/src/include/utils/elog.h

/*-------------------------------------------------------------------------
 *
 * elog.h
 *	  POSTGRES error reporting/logging definitions.
 *
 *
 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/include/utils/elog.h,v 1.66 2004/03/15 15:56:28 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef ELOG_H
#define ELOG_H

/* Error level codes */
#define DEBUG5		10			/* Debugging messages, in categories of
								 * decreasing detail. */
#define DEBUG4		11
#define DEBUG3		12
#define DEBUG2		13
#define DEBUG1		14			/* used by GUC debug_* variables */
#define LOG			15			/* Server operational messages; sent only
								 * to server log by default. */
#define COMMERROR	16			/* Client communication problems; same as
								 * LOG for server reporting, but never
								 * sent to client. */
#define INFO		17			/* Informative messages that are always
								 * sent to client;	is not affected by
								 * client_min_messages */
#define NOTICE		18			/* Helpful messages to users about query
								 * operation;  sent to client and server
								 * log by default. */
#define WARNING		19			/* Warnings */
#define ERROR		20			/* user error - abort transaction; return
								 * to known state */
/* Save ERROR value in PGERROR so it can be restored when Win32 includes
 * modify it.  We have to use a constant rather than ERROR because macros
 * are expanded only when referenced outside macros.
 */
#ifdef WIN32
#define PGERROR		20
#endif
#define FATAL		21			/* fatal error - abort process */
#define PANIC		22			/* take down the other backends with me */

 /* #define DEBUG DEBUG1 */	/* Backward compatibility with pre-7.3 */


/* macros for representing SQLSTATE strings compactly */
#define PGSIXBIT(ch)	(((ch) - '0') & 0x3F)
#define PGUNSIXBIT(val) (((val) & 0x3F) + '0')

#define MAKE_SQLSTATE(ch1,ch2,ch3,ch4,ch5)	\
	(PGSIXBIT(ch1) + (PGSIXBIT(ch2) << 6) + (PGSIXBIT(ch3) << 12) + \
	 (PGSIXBIT(ch4) << 18) + (PGSIXBIT(ch5) << 24))

/* SQLSTATE codes for errors are defined in a separate file */
#include "utils/errcodes.h"


/* Which __func__ symbol do we have, if any? */
#ifdef HAVE_FUNCNAME__FUNC
#define PG_FUNCNAME_MACRO	__func__
#else
#ifdef HAVE_FUNCNAME__FUNCTION
#define PG_FUNCNAME_MACRO	__FUNCTION__
#else
#define PG_FUNCNAME_MACRO	NULL
#endif
#endif


/*----------
 * New-style error reporting API: to be used in this way:
 *		ereport(ERROR,
 *				(errcode(ERRCODE_UNDEFINED_CURSOR),
 *				 errmsg("portal \"%s\" not found", stmt->portalname),
 *				 ... other errxxx() fields as needed ...));
 *
 * The error level is required, and so is a primary error message (errmsg
 * or errmsg_internal).  All else is optional.	errcode() defaults to
 * ERRCODE_INTERNAL_ERROR if elevel is ERROR or more, ERRCODE_WARNING
 * if elevel is WARNING, or ERRCODE_SUCCESSFUL_COMPLETION if elevel is
 * NOTICE or below.
 *----------
 */
#define ereport(elevel, rest)  \
	(errstart(elevel, __FILE__, __LINE__, PG_FUNCNAME_MACRO) ? \
	 (errfinish rest) : (void) 0)

extern bool errstart(int elevel, const char *filename, int lineno,
		 const char *funcname);
extern void errfinish(int dummy,...);

extern int	errcode(int sqlerrcode);

extern int	errcode_for_file_access(void);
extern int	errcode_for_socket_access(void);

extern int
errmsg(const char *fmt,...)
/* This extension allows gcc to check the format string for consistency with
   the supplied arguments. */
__attribute__((format(printf, 1, 2)));

extern int
errmsg_internal(const char *fmt,...)
/* This extension allows gcc to check the format string for consistency with
   the supplied arguments. */
__attribute__((format(printf, 1, 2)));

extern int
errdetail(const char *fmt,...)
/* This extension allows gcc to check the format string for consistency with
   the supplied arguments. */
__attribute__((format(printf, 1, 2)));

extern int
errhint(const char *fmt,...)
/* This extension allows gcc to check the format string for consistency with
   the supplied arguments. */
__attribute__((format(printf, 1, 2)));

extern int
errcontext(const char *fmt,...)
/* This extension allows gcc to check the format string for consistency with
   the supplied arguments. */
__attribute__((format(printf, 1, 2)));

extern int	errfunction(const char *funcname);
extern int	errposition(int cursorpos);


/*----------
 * Old-style error reporting API: to be used in this way:
 *		elog(ERROR, "portal \"%s\" not found", stmt->portalname);
 *----------
 */
#define elog	errstart(ERROR, __FILE__, __LINE__, PG_FUNCNAME_MACRO), elog_finish

extern void
elog_finish(int elevel, const char *fmt,...)
/* This extension allows gcc to check the format string for consistency with
   the supplied arguments. */
__attribute__((format(printf, 2, 3)));


/* Support for attaching context information to error reports */

typedef struct ErrorContextCallback
{
	struct ErrorContextCallback *previous;
	void		(*callback) (void *arg);
	void	   *arg;
} ErrorContextCallback;

extern DLLIMPORT ErrorContextCallback *error_context_stack;


/* GUC-configurable parameters */

typedef enum
{
	PGERROR_TERSE,				/* single-line error messages */
	PGERROR_DEFAULT,			/* recommended style */
	PGERROR_VERBOSE				/* all the facts, ma'am */
} PGErrorVerbosity;

extern PGErrorVerbosity Log_error_verbosity;
extern char *Log_line_prefix;

#ifdef HAVE_SYSLOG
extern int	Use_syslog;
#endif


/* Other exported functions */
extern void DebugFileOpen(void);

#endif   /* ELOG_H */