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#!/usr/bin/env python
# 2ping - A bi-directional ping utility
# Copyright (C) 2015 Ryan Finnie
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
from __future__ import print_function
import select
import errno
class EpollPoller():
poller_type = 'epoll'
def __init__(self):
self.poller = select.epoll()
self.f_dict = {}
def register(self, f):
fileno = f.fileno()
if fileno not in self.f_dict:
self.poller.register(fileno, select.EPOLLIN)
self.f_dict[fileno] = f
def close(self):
return self.poller.close()
def poll(self, timeout):
try:
poll_res = self.poller.poll(timeout)
except (select.error, IOError, OSError) as e:
if e.args[0] not in (errno.EINTR,):
raise
return []
res = []
for i in poll_res:
if i[0] in self.f_dict:
res.append(self.f_dict[i[0]])
return res
class KqueuePoller():
poller_type = 'kqueue'
def __init__(self):
self.poller = select.kqueue()
self.kevents = []
self.f_dict = {}
def register(self, f):
fileno = f.fileno()
if fileno not in self.f_dict:
self.kevents.append(select.kevent(
fileno,
filter=select.KQ_FILTER_READ,
flags=select.KQ_EV_ADD | select.KQ_EV_ENABLE,
))
self.f_dict[fileno] = f
def close(self):
return self.poller.close()
def poll(self, timeout):
try:
poll_res = self.poller.control(self.kevents, 10, timeout)
except (select.error, IOError, OSError) as e:
if e.args[0] not in (errno.EINTR,):
raise
return []
res = []
for i in poll_res:
if i.ident in self.f_dict:
res.append(self.f_dict[i.ident])
return res
class PollPoller():
poller_type = 'poll'
def __init__(self):
self.poller = select.poll()
self.f_dict = {}
def register(self, f):
fileno = f.fileno()
if fileno not in self.f_dict:
self.poller.register(fileno, select.POLLIN)
self.f_dict[fileno] = f
def close(self):
return self.poller.close()
def poll(self, timeout):
try:
poll_res = self.poller.poll(timeout * 1000.0)
except (select.error, IOError, OSError) as e:
if e.args[0] not in (errno.EINTR,):
raise
return []
res = []
for i in poll_res:
if i[0] in self.f_dict:
res.append(self.f_dict[i[0]])
return res
class SelectPoller():
poller_type = 'select'
def __init__(self):
self.f_dict = {}
def register(self, f):
self.f_dict[f.fileno()] = f
def close(self):
pass
def poll(self, timeout):
try:
return select.select(
self.f_dict.values(),
[],
[],
timeout
)[0]
except (select.error, IOError, OSError) as e:
if e.args[0] not in (errno.EINTR,):
raise
return []
def best_poller():
try:
return EpollPoller()
except AttributeError:
pass
try:
return KqueuePoller()
except AttributeError:
pass
try:
return PollPoller()
except AttributeError:
pass
return SelectPoller()
def available_pollers():
available = []
for poller in [
EpollPoller, KqueuePoller, PollPoller, SelectPoller
]:
try:
available.append(poller())
except AttributeError:
continue
return available
if __name__ == '__main__':
available = available_pollers()
print('Available pollers: %s' % ' '.join([p.poller_type for p in available]))
poller = best_poller()
print('Best poller: %s' % poller.poller_type)
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