# Service Functions

Fortran:

- `oldmode = vmlsetmode( mode )`
- `mode = vmlgetmode( )`
- `olderr = vmlseterrstatus ( err )`
- `err = vmlgeterrstatus( )`
- `olderr = vmlclearerrstatus( )`
- `oldcallback = vmlseterrorcallback( callback )`
- `callback = vmlgeterrorcallback( )`
- `oldcallback = vmlclearerrorcallback( )`

C:

- `oldmode = vmlSetMode( mode );`
- `mode = vmlGetMode( void );`
- `olderr = vmlSetErrStatus ( err );`
- `err = vmlGetErrStatus( void );`
- `olderr = vmlClearErrStatus( void );`
- `oldcallback = vmlSetErrorCallBack( callback );`
- `callback = vmlGetErrorCallBack( void );`
- `oldcallback = vmlClearErrorCallBack( void );`

Parent topic: Functions Interface