---
title: nullRxHandler
framework: kernel
role: pseudoSymbol
path: kernel/iokerneldebugger/1812663-nullrxhandler
---

# nullRxHandler

Null receive handler.

## Declaration

```occ
static void nullRxHandler(
 IOService *target, 
 void *buffer, 
 UInt32 *length, 
 UInt32 timeout ); 
```

## Overview

Overview This function is registered as the receive handler when an IOKernelDebugger object surrenders its status as the active debugger nub. Until another IOKernelDebugger object gets promoted, this function will handle polled receive requests from KDP. This function does nothing except to log a warning message.

## See Also

### Miscellaneous

- [debugger](kernel/iokerneldebugger/1812543-debugger.md)
- [free](kernel/iokerneldebugger/1812554-free.md)
- [handleClose](kernel/iokerneldebugger/1812560-handleclose.md)
- [handleIsOpen](kernel/iokerneldebugger/1812565-handleisopen.md)
- [handleOpen](kernel/iokerneldebugger/1812573-handleopen.md)
- [init](kernel/iokerneldebugger/1812584-init.md)
- [kdpLinkStatusDispatcher](kernel/iokerneldebugger/1812595-kdplinkstatusdispatcher.md)
- [kdpReceiveDispatcher](kernel/iokerneldebugger/1812607-kdpreceivedispatcher.md)
- [kdpSetModeDispatcher](kernel/iokerneldebugger/1812616-kdpsetmodedispatcher.md)
- [kdpTransmitDispatcher](kernel/iokerneldebugger/1812631-kdptransmitdispatcher.md)
- [lock](kernel/iokerneldebugger/1812643-lock.md)
- [nullLinkStatusHandler](kernel/iokerneldebugger/1812653-nulllinkstatushandler.md)
- [nullSetModeHandler](kernel/iokerneldebugger/1812671-nullsetmodehandler.md)
- [nullTxHandler](kernel/iokerneldebugger/1812684-nulltxhandler.md)
- [powerStateDidChangeTo](kernel/iokerneldebugger/1812705-powerstatedidchangeto.md)
- [powerStateWillChangeTo](kernel/iokerneldebugger/1812727-powerstatewillchangeto.md)
- [registerHandler](kernel/iokerneldebugger/1812741-registerhandler.md)
- [signalDebugger](kernel/iokerneldebugger/1812763-signaldebugger.md)
- [unlock](kernel/iokerneldebugger/1812777-unlock.md)