Fwd: Hooking

 Hi All,
          Can anybody please suggest how hooking can be done
in the xserver functions. XServer needs to invoke my function before
the call is passed to the XServer original function. I have found that
this is the procedure in windows for doing hooking:

HOOKPROC hkprcSysMsg; 
static HINSTANCE hinstDLL; 
static HHOOK hhookSysMsg; 
 
hinstDLL = LoadLibrary((LPCTSTR) "c:\\windows\\sysmsg.dll"); 
hkprcSysMsg = (HOOKPROC)GetProcAddress(hinstDLL, "SysMessageProc"); 
hhookSysMsg = SetWindowsHookEx(WH_SYSMSGFILTER,hkprcSysMsg,hinstDLL,0); 

Please suggest a function similar to SetWindowsHookEx in Linux or else suggest 
some procedure in which I can do the hooking in linux.

Any help in this regard will be greatly appreciated,

Thank you.

Best Regards
Rama
Email : [email protected]



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Thanks&Regards
Reddy