petsc-3.10.5 2019-03-28
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# PetscAttachDebuggerErrorHandler

Error handler that attaches a debugger to a running process when an error is detected. This routine is useful for examining variables, etc.

### Synopsis

    #include "petscsys.h"
    PetscErrorCode  PetscAttachDebuggerErrorHandler(MPI_Comm comm,int line,const char *fun,const char *file,PetscErrorCode num,PetscErrorType p,const char *mess,void *ctx)

Not Collective

### Input Parameters

| comm | - communicator over which error occurred
| line | - the line number of the error (indicated by __LINE__)
| file | - the file in which the error was detected (indicated by __FILE__)
| message | - an error text string, usually just printed to the screen
| number | - the generic error number
| p | - PETSC_ERROR_INITIAL if error just detected, otherwise PETSC_ERROR_REPEAT
| ctx | - error handler context

### Options Database Keys

-on_error_attach_debugger [noxterm,dbx,xxgdb,xdb,xldb,gdb] [ -display name] - Activates debugger attachment

### Notes

By default the GNU debugger, gdb, is used. Alternatives are lldb, dbx and xxgdb,xldb (on IBM rs6000), xdb (on HP-UX).

Most users need not directly employ this routine and the other error handlers, but can instead use the simplified interface SETERR, which has the calling sequence

        SETERRQ(PETSC_COMM_SELF,number,p,message)

### Notes for experienced users

Use PetscPushErrorHandler() to set the desired error handler. The currently available PETSc error handlers are

       PetscTraceBackErrorHandler()

       PetscAttachDebuggerErrorHandler()

       PetscAbortErrorHandler()

or you may write your own.

### See Also

PetscPushErrorHandler(), PetscTraceBackErrorHandler(),
PetscAbortErrorHandler()

### Level

developer

### Location

src/sys/error/adebug.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages