syscall function parameter

[Hubert]

const HLEFunction sceNetAdhocctl[] =
{
{...}, {...},
{0x20B317A0, WrapI_UU<sceNetAdhocctlAddHandler>, "sceNetAdhocctlAddHandler"},
...,
{...},
}
typedef void(* sceNetAdhocctlHandler)(int flag, int error, void *unknown);

int sceNetAdhocctlAddHandler(u32 handler, u32 unknown)
{
netActHandler = (sceNetAdhocctlHandler)Memory::GetPointer(handler);
netActParam=(void*)unknown;
// I know this function is not here call, just test
if (netActHandler)
netActHandler(3, 0, netActParam); // this will break when debug
return 0; //return Handler id on success, < 0 on error.
}

Parameter handler point to function is not compile???
How to make it run well?

My English is not good, don't dispute my grammar.