Declare "typedef int (x)(void )" in java with GraalVM

I'm trying to consume a C library with GraalMV and I have the following struct I don't find how to declare:


typedef int (*mon_handler)(void *);

typedef struct
{
  mon_handler mon_cb;

} opts;

I need to know with which data type declare mon_handler

@CStruct(value="opts")
interface Opts extends Pointerbase{
  
  @CField("mon_handler")
  ???????? getMonHandler();
}

Thanks in advance!!

Solution

After the typecasting of the void pointer this simplifies to

typedef int *mon_handler;

Where mon_handler is a pointer to an int. It's essentially equivalent to

typedef (int *) mon_handler;

So the correct mapping would be IntByReference in JNA. CIntPointer in GraalVM also matches this type:

A pointer to a 32-bit C primitive value.

Declare "typedef int (*x)(void *)" in java with GraalVM