DosUnsetExceptionHandler: Difference between revisions
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==Syntax== | ==Syntax== | ||
DosUnsetExceptionHandler(pERegRec) | |||
==Parameters== | ==Parameters== | ||
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==Return Code== | ==Return Code== | ||
;ulrc (APIRET) - returns:DosUnsetExceptionHandler returns one of the following values: | |||
DosUnsetExceptionHandler returns one of the following values: | * 0 NO_ERROR | ||
* 0 | |||
* 87 ERROR_INVALID_PARAMETER | * 87 ERROR_INVALID_PARAMETER | ||
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int main (VOID) | int main (VOID) | ||
{ | { | ||
EXCEPTIONREGISTRATIONRECORD RegRec = {0}; | EXCEPTIONREGISTRATIONRECORD RegRec = {0}; /* Exception Registration Record */ | ||
APIRET rc = NO_ERROR; /* Return code */ | APIRET rc = NO_ERROR; /* Return code */ | ||
Latest revision as of 16:13, 8 March 2018
Removes an exception handler from a thread's chain of exception handlers.
Syntax
DosUnsetExceptionHandler(pERegRec)
Parameters
- pERegRec (PEXCEPTIONREGISTRATIONRECORD) - input
- A pointer to the exception registration record that describes the exception handler to be unregistered.
Return Code
- ulrc (APIRET) - returns
- DosUnsetExceptionHandler returns one of the following values:
- 0 NO_ERROR
- 87 ERROR_INVALID_PARAMETER
Remarks
Note: Do not make Presentation Manager calls from exception handlers.
DosUnsetExceptionHandler deregisters (removes) an exception handler from a thread's chain of registered exception handlers.
For a detailed list of the system exceptions, see System Exceptions.
Example Code
This example sets and unsets an exception handler named "MyTermhandler" from the thread's chain of exception handlers.
#define INCL_DOSPROCESS /* DOS process values (for DosSleep) */
#define INCL_DOSEXCEPTIONS /* DOS exception values */
#define INCL_ERRORS /* DOS error values */
#include <os2.h>
#include <stdio.h>
ULONG _System MyTermHandler( PEXCEPTIONREPORTRECORD p1,
PEXCEPTIONREGISTRATIONRECORD p2,
PCONTEXTRECORD p3,
PVOID pv );
int main (VOID)
{
EXCEPTIONREGISTRATIONRECORD RegRec = {0}; /* Exception Registration Record */
APIRET rc = NO_ERROR; /* Return code */
/* Add MyTermHandler to this thread's chain of exception handlers */
RegRec.ExceptionHandler = (ERR)MyTermHandler;
rc = DosSetExceptionHandler( &RegRec );
if (rc != NO_ERROR) {
printf("DosSetExceptionHandler error: return code = %u\n",rc);
return 1;
}
printf("Terminate this program using Ctrl-C or Ctrl-Break.\n");
rc = DosSleep(60000L); /* Give user plenty of time to comply... */
rc = DosUnsetExceptionHandler( &RegRec );
if (rc != NO_ERROR) {
printf("DosUnsetExceptionHandler error: return code = %u\n",rc);
return 1;
}
return NO_ERROR;
}
/***************************************************************************/
ULONG _System MyTermHandler( PEXCEPTIONREPORTRECORD p1,
PEXCEPTIONREGISTRATIONRECORD p2,
PCONTEXTRECORD p3,
PVOID pv )
{
printf("*** MyTermHandler entered: ExceptionNum = %x\n",p1->ExceptionNum);
switch( p1->ExceptionNum) {
case XCPT_SIGNAL: {
printf(" XCPT_SIGNAL");
switch( p1->ExceptionInfo[0] ) {
case XCPT_SIGNAL_INTR: { printf("_INTR"); break; }
case XCPT_SIGNAL_KILLPROC: { printf("_KILLPROC"); break; }
case XCPT_SIGNAL_BREAK: { printf("_BREAK"); break; }
default:;
}
printf("\n"); break;
}
case XCPT_PROCESS_TERMINATE: { printf(" Process Terminate \n"); break;}
case XCPT_ASYNC_PROCESS_TERMINATE: { printf(" Async Process Term\n"); break;}
case XCPT_UNWIND: { printf(" XCPT_UNWIND\n"); break;}
default:;
}
return XCPT_CONTINUE_SEARCH; /* Exception not resolved... */
}