If necessary, use /proc/loadavg to emulate os.getloadavg().

svn path=/main/trunk/; revision=12422

pym/_emerge/__init__.py

@@ -8951,6 +8951,29 @@ def create_poll_instance():
 		return select.poll()
 	return PollSelectAdapter()
 
+getloadavg = getattr(os, "getloadavg", None)
+if getloadavg is None:
+	def getloadavg():
+		"""
+		Uses /proc/loadavg to emulate os.getloadavg().
+		Raises OSError if the load average was unobtainable.
+		"""
+		try:
+			loadavg_str = open('/proc/loadavg').readline()
+		except IOError:
+			# getloadavg() is only supposed to raise OSError, so convert
+			raise OSError('unknown')
+		loadavg_split = loadavg_str.split()
+		if len(loadavg_split) < 3:
+			raise OSError('unknown')
+		loadavg_floats = []
+		for i in xrange(3):
+			try:
+				loadavg_floats.append(float(loadavg_split[i]))
+			except ValueError:
+				raise OSError('unknown')
+		return tuple(loadavg_floats)
+
 class PollScheduler(object):
 
 	class _sched_iface_class(SlotObject):
@@ -8998,11 +9021,8 @@ def _can_add_job(self):
 			(max_jobs is True or max_jobs > 1) and \
 			self._running_job_count() >= 1:
 			try:
-				avg1, avg5, avg15 = os.getloadavg()
-			except (AttributeError, OSError), e:
-				writemsg("!!! getloadavg() failed: %s\n" % (e,),
-					noiselevel=-1)
-				del e
+				avg1, avg5, avg15 = getloadavg()
+			except OSError:
 				return False
 
 			if avg1 >= max_load:
@@ -9383,9 +9403,9 @@ def _property_change(self, name, old_value, new_value):
 
 	def _load_avg_str(self):
 		try:
-			avg = os.getloadavg()
-		except (AttributeError, OSError), e:
-			return str(e)
+			avg = getloadavg()
+		except OSError:
+			return 'unknown'
 
 		max_avg = max(avg)