diff --git a/src/sys/kernel/syscall.c b/src/sys/kernel/syscall.c
index a0e0869..ae9c6b6 100644
--- a/src/sys/kernel/syscall.c
+++ b/src/sys/kernel/syscall.c
@@ -65,27 +65,32 @@
   );
 
 void sysGetpid(int *pid) {
-  *pid = _current->id;
+  if (pid)
+    *pid = _current->id;
   return;
   }
 
 void sysGetUid(int *uid) {
-  *uid = _current->uid;
+  if (uid)
+    *uid = _current->uid;
   return;
   }
 
 void sysGetGid(int *gid) {
-  *gid = _current->gid;
+  if (gid)
+    *gid = _current->gid;
   return;
   }
 
 void sysSetUid(int uid,int *status) {
   if (_current->uid == 0x0) {
     _current->uid = uid;
-    *status = 0x0;
+    if (status)
+      *status = 0x0;
     }
   else {
-    *status = 1;
+    if (status)
+      *status = 1;
     }
   return;
   }
@@ -93,10 +98,12 @@
 void sysSetGid(int gid,int *status) {
   if (_current->gid == 0x0) {
     _current->gid = gid;
-    *status = 0x0;
+    if (status)
+      *status = 0x0;
     }
   else {
-    *status = 1;
+    if (status)
+      *status = 1;
     }
   return;
   }  
@@ -120,28 +127,33 @@
 
 ************************************************************************/  
 void sysGetFreePage(long *ptr,int count) {
-  *ptr = (long) vmmGetFreeVirtualPage(_current->id,count);
+  if (ptr)
+    *ptr = (long) vmmGetFreeVirtualPage(_current->id,count);
   return;
   }
 
 void sysGetDrives(uInt32 *ptr) {
-  *ptr = 0x0;//(uInt32)devices;
+  if (ptr)
+    *ptr = 0x0;//(uInt32)devices;
   return;
   }
 
 void sysGetUptime(uInt32 *ptr) {
-  *ptr = systemVitals->sysTicks;
+  if (ptr)
+    *ptr = systemVitals->sysTicks;
   return;
   }
 
 void sysGetTime(uInt32 *ptr) {
-  *ptr = systemVitals->sysUptime + systemVitals->timeStart;
+  if (ptr)
+    *ptr = systemVitals->sysUptime + systemVitals->timeStart;
   return;
   }
 
 
 void sysGetCwd(char *data,int len) {
-  sprintf(data,_current->oInfo.cwd);
+  if (data)
+    sprintf(data,_current->oInfo.cwd);
   return;
   }
 
@@ -162,32 +174,40 @@
   }
 
 void sysMpiCreateMbox(uInt32 *status,char *name) {
-  *status = mpiCreateMbox(name); 
+  if (status && name)
+    *status = mpiCreateMbox(name); 
   return;
   }
 
 void sysMpiDestroyMbox(uInt32 *status,char *name) {
-  *status = mpiDestroyMbox(name);
+  if (status && name)
+    *status = mpiDestroyMbox(name);
   return;
   }
 
 void sysMpiPostMessage(char *name,uInt32 *type,void *data) {
-  *type = mpiPostMessage(name,*type,data);
+  if (type && name && data)
+    *type = mpiPostMessage(name,*type,data);
   return;
   }
 
 void sysMpiFetchMessage(char *name,mpiMessage_t *msg,uInt32 *status) {
-  *status = mpiFetchMessage(name,msg);
+  if (status && name && msg)
+    *status = mpiFetchMessage(name,msg);
   return;
   }
 
 void sysMpiSpam(uInt32 type,void *data,uInt32 *status) {
-  *status = mpiSpam(type,data);
+  if (status && data)
+    *status = mpiSpam(type,data);
   return;
   }
 
 /***
  $Log$
+ Revision 1.21  2004/07/21 20:55:10  reddawg
+ fixed invalidSyscall
+
  Revision 1.20  2004/07/21 20:36:55  reddawg
  New syscall interface