added a process_finished event and added syslog error reporting

module/sched.lua

@@ -2,7 +2,13 @@ do
 local tTasks,nPid,nTimeout,cPid = {},1,0.25,0 -- table of tasks, next process ID, event timeout, current PID
 function os.spawn(f,n) -- function string -- number -- creates a process from function *f* with name *n*
  tTasks[nPid] = {
-  c=coroutine.create(f), -- actual coroutine
+  c=coroutine.create(function()
+   local rt = {pcall(f)}
+   if not rt[1] then
+    syslog(rt[2])
+   end
+   computer.pushSignal("process_finished",os.pid(),table.unpack(rt))
+  end), -- actual coroutine
   n=n, -- process name
   p=nPid, -- process PID
   P=cPid, -- parent PID