# PetscTraceBackErrorHandler
Default error handler routine that generates a traceback on error detection. 
## Synopsis
```
#include "petscsys.h" 
PetscErrorCode PetscTraceBackErrorHandler(MPI_Comm comm, int line, const char *fun, const char *file, PetscErrorCode n, 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__)
- ***mess -*** an error text string, usually just printed to the screen
- ***n -*** the generic error number
- ***p -*** `PETSC_ERROR_INITIAL` if this is the first call the error handler, otherwise `PETSC_ERROR_REPEAT`
- ***ctx -*** error handler context



## Options Database Keys

- ***-error_output_stdout -*** output the error messages to stdout instead of the default stderr
- ***-error_output_none -*** do not output the error messages



## Notes
Users do not directly call this routine

Use `PetscPushErrorHandler()` to set the desired error handler.




## See Also
 `PetscError()`, `PetscPushErrorHandler()`, `PetscPopErrorHandler()`, `PetscAttachDebuggerErrorHandler()`,
`PetscAbortErrorHandler()`, `PetscMPIAbortErrorHandler()`, `PetscReturnErrorHandler()`, `PetscEmacsClientErrorHandler()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/error/errtrace.c.html#PetscTraceBackErrorHandler">src/sys/error/errtrace.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/error/errtrace.c)


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