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# DMShellSetDestroyContext
set a function that destroys the context provided with `DMShellSetContext()`
## Synopsis
```
#include "petscdmshell.h"
PetscErrorCode DMShellSetDestroyContext(DM dm, PetscErrorCode (*destroyctx)(void *))
```
Collective
## Input Parameters
- ***dm -*** the `DM` to attach the `destroyctx()` function to
- ***destroyctx -*** the function that destroys the context
## See Also
`DM`, `DMSHELL`, `DMShellSetContext()`, `DMShellGetContext()`
## Level
advanced
## Location
src/dm/impls/shell/dmshell.c
## Examples
src/ksp/ksp/tutorials/ex65.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/shell/dmshell.c)
[Index of all DM routines](index.md)
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