# PetscDLLibrarySym
Load a symbol from the dynamic link libraries. 
## Synopsis
```
PetscErrorCode PetscDLLibrarySym(MPI_Comm comm, PetscDLLibrary *outlist, const char path[], const char insymbol[], void **value)
```
Collective


## Input Parameters

- ***comm -*** communicator that will open the library
- ***outlist -*** list of already open libraries that may contain symbol (can be NULL and only the executable is searched for the function)
- ***path     -*** optional complete library name (if provided checks here before checking outlist)
- ***insymbol -*** name of symbol



## Output Parameter

- ***value -*** if symbol not found then this value is set to NULL





## Notes
Symbol can be of the form
[/path/libname[.so.1.0]:]functionname[()] where items in [] denote optional

Will attempt to (retrieve and) open the library if it is not yet been opened.


## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/dll/dl.c.html#PetscDLLibrarySym">src/sys/dll/dl.c</A>


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


[Index of all Sys routines](index.md)  
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[Index of all manual pages](/docs/manualpages/singleindex.md)  
