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/*-------------------------------------------------------------------------
*
* exc.c--
* POSTGRES exception handling code.
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/error/Attic/exc.c,v 1.6.2.2 1996/12/14 08:26:08 vadim Exp $
*
* NOTE
* XXX this code needs improvement--check for state violations and
* XXX reset after handling an exception.
*
*-------------------------------------------------------------------------
*/
#include <stdio.h> /* XXX use own I/O routines */
#include <errno.h>
#include "postgres.h"
#include "utils/exc.h"
#include "storage/ipc.h"
/*
* Global Variables
*/
static bool ExceptionHandlingEnabled = false;
char* ExcFileName = NULL;
Index ExcLineNumber = 0;
ExcFrame *ExcCurFrameP = NULL;
static ExcProc *ExcUnCaughtP = NULL;
extern char* ProgramName;
/*
* Exported Functions
*/
/*
* EnableExceptionHandling --
* Enables/disables the exception handling system.
*
* Note:
* This must be called before any exceptions occur. I.e., call this first!
* This routine will not return if an error is detected.
* This does not follow the usual Enable... protocol.
* This should be merged more closely with the error logging and tracing
* packages.
*
* Exceptions:
* none
*/
/*
* Excection handling should be supported by the language, thus there should
* be no need to explicitly enable exception processing.
*
* This function should probably not be called, ever. Currently it does
* almost nothing. If there is a need for this intialization and checking.
* then this function should be converted to the new-style Enable code and
* called by all the other module Enable functions.
*/
void
EnableExceptionHandling(bool on)
{
if (on == ExceptionHandlingEnabled) {
/* XXX add logging of failed state */
exitpg(255);
/* ExitPostgres(FatalExitStatus); */
}
if (on) { /* initialize */
;
} else { /* cleanup */
ExcFileName = NULL;
ExcLineNumber = 0;
ExcCurFrameP = NULL;
ExcUnCaughtP = NULL;
}
ExceptionHandlingEnabled = on;
}
void
ExcPrint(Exception *excP,
ExcDetail detail,
ExcData data,
ExcMessage message)
{
extern int errno;
extern int sys_nerr;
#if !defined(BSD44_derived) && \
!defined(bsdi) && \
!defined(bsdi_2_1)
extern char *sys_errlist[];
#endif /* ! bsd_derived */
#ifdef lint
data = data;
#endif
(void) fflush(stdout); /* In case stderr is buffered */
#if 0
if (ProgramName != NULL && *ProgramName != '\0')
(void) fprintf(stderr, "%s: ", ProgramName);
#endif
if (message != NULL)
(void) fprintf(stderr, "%s", message);
else if (excP->message != NULL)
(void) fprintf(stderr, "%s", excP->message);
else
#ifdef lint
(void) fprintf(stderr, "UNNAMED EXCEPTION 0x%lx", excP);
#else
(void) fprintf(stderr, "UNNAMED EXCEPTION 0x%lx", (long)excP);
#endif
(void) fprintf(stderr, " (%ld)", detail);
if (errno > 0 && errno < sys_nerr &&
sys_errlist[errno] != NULL && sys_errlist[errno][0] != '\0')
(void) fprintf(stderr, " [%s]", sys_errlist[errno]);
else if (errno != 0)
(void) fprintf(stderr, " [Error %d]", errno);
(void) fprintf(stderr, "\n");
(void) fflush(stderr);
}
ExcProc *
ExcGetUnCaught(void)
{
return (ExcUnCaughtP);
}
ExcProc *
ExcSetUnCaught(ExcProc *newP)
{
ExcProc *oldP = ExcUnCaughtP;
ExcUnCaughtP = newP;
return (oldP);
}
void
ExcUnCaught(Exception *excP,
ExcDetail detail,
ExcData data,
ExcMessage message)
{
ExcPrint(excP, detail, data, message);
ExcAbort(excP, detail, data, message);
}
void
ExcRaise(Exception *excP,
ExcDetail detail,
ExcData data,
ExcMessage message)
{
register ExcFrame *efp;
efp = ExcCurFrameP;
if (efp == NULL) {
if (ExcUnCaughtP != NULL)
(*ExcUnCaughtP)(excP, detail, data, message);
ExcUnCaught(excP, detail, data, message);
} else {
efp->id = excP;
efp->detail = detail;
efp->data = data;
efp->message = message;
ExcCurFrameP = efp->link;
#if !defined (SIGJMP_BUF)
longjmp(efp->context, 1);
#else
siglongjmp(efp->context, 1);
#endif
}
}
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