454 lines
16 KiB
Python
454 lines
16 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""POSIX specific tests."""
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import datetime
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import errno
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import os
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import re
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import subprocess
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import time
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import psutil
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from psutil import AIX
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from psutil import BSD
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from psutil import LINUX
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from psutil import MACOS
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from psutil import OPENBSD
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from psutil import POSIX
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from psutil import SUNOS
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from psutil.tests import APPVEYOR
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from psutil.tests import get_kernel_version
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from psutil.tests import get_test_subprocess
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from psutil.tests import HAS_NET_IO_COUNTERS
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from psutil.tests import mock
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from psutil.tests import PYTHON_EXE
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from psutil.tests import reap_children
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from psutil.tests import retry_on_failure
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from psutil.tests import sh
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from psutil.tests import skip_on_access_denied
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from psutil.tests import TRAVIS
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from psutil.tests import unittest
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from psutil.tests import wait_for_pid
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from psutil.tests import which
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def ps(fmt, pid=None):
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"""
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Wrapper for calling the ps command with a little bit of cross-platform
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support for a narrow range of features.
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"""
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cmd = ['ps']
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if LINUX:
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cmd.append('--no-headers')
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if pid is not None:
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cmd.extend(['-p', str(pid)])
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else:
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if SUNOS or AIX:
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cmd.append('-A')
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else:
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cmd.append('ax')
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if SUNOS:
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fmt_map = {'command', 'comm',
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'start', 'stime'}
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fmt = fmt_map.get(fmt, fmt)
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cmd.extend(['-o', fmt])
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output = sh(cmd)
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if LINUX:
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output = output.splitlines()
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else:
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output = output.splitlines()[1:]
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all_output = []
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for line in output:
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line = line.strip()
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try:
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line = int(line)
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except ValueError:
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pass
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all_output.append(line)
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if pid is None:
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return all_output
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else:
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return all_output[0]
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# ps "-o" field names differ wildly between platforms.
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# "comm" means "only executable name" but is not available on BSD platforms.
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# "args" means "command with all its arguments", and is also not available
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# on BSD platforms.
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# "command" is like "args" on most platforms, but like "comm" on AIX,
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# and not available on SUNOS.
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# so for the executable name we can use "comm" on Solaris and split "command"
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# on other platforms.
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# to get the cmdline (with args) we have to use "args" on AIX and
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# Solaris, and can use "command" on all others.
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def ps_name(pid):
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field = "command"
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if SUNOS:
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field = "comm"
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return ps(field, pid).split()[0]
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def ps_args(pid):
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field = "command"
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if AIX or SUNOS:
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field = "args"
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return ps(field, pid)
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def ps_rss(pid):
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field = "rss"
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if AIX:
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field = "rssize"
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return ps(field, pid)
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def ps_vsz(pid):
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field = "vsz"
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if AIX:
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field = "vsize"
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return ps(field, pid)
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@unittest.skipIf(not POSIX, "POSIX only")
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class TestProcess(unittest.TestCase):
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"""Compare psutil results against 'ps' command line utility (mainly)."""
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@classmethod
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def setUpClass(cls):
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cls.pid = get_test_subprocess([PYTHON_EXE, "-E", "-O"],
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stdin=subprocess.PIPE).pid
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wait_for_pid(cls.pid)
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@classmethod
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def tearDownClass(cls):
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reap_children()
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def test_ppid(self):
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ppid_ps = ps('ppid', self.pid)
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ppid_psutil = psutil.Process(self.pid).ppid()
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self.assertEqual(ppid_ps, ppid_psutil)
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def test_uid(self):
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uid_ps = ps('uid', self.pid)
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uid_psutil = psutil.Process(self.pid).uids().real
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self.assertEqual(uid_ps, uid_psutil)
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def test_gid(self):
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gid_ps = ps('rgid', self.pid)
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gid_psutil = psutil.Process(self.pid).gids().real
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self.assertEqual(gid_ps, gid_psutil)
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def test_username(self):
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username_ps = ps('user', self.pid)
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username_psutil = psutil.Process(self.pid).username()
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self.assertEqual(username_ps, username_psutil)
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def test_username_no_resolution(self):
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# Emulate a case where the system can't resolve the uid to
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# a username in which case psutil is supposed to return
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# the stringified uid.
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p = psutil.Process()
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with mock.patch("psutil.pwd.getpwuid", side_effect=KeyError) as fun:
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self.assertEqual(p.username(), str(p.uids().real))
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assert fun.called
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@skip_on_access_denied()
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@retry_on_failure()
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def test_rss_memory(self):
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# give python interpreter some time to properly initialize
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# so that the results are the same
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time.sleep(0.1)
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rss_ps = ps_rss(self.pid)
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rss_psutil = psutil.Process(self.pid).memory_info()[0] / 1024
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self.assertEqual(rss_ps, rss_psutil)
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@skip_on_access_denied()
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@retry_on_failure()
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def test_vsz_memory(self):
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# give python interpreter some time to properly initialize
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# so that the results are the same
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time.sleep(0.1)
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vsz_ps = ps_vsz(self.pid)
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vsz_psutil = psutil.Process(self.pid).memory_info()[1] / 1024
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self.assertEqual(vsz_ps, vsz_psutil)
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def test_name(self):
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name_ps = ps_name(self.pid)
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# remove path if there is any, from the command
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name_ps = os.path.basename(name_ps).lower()
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name_psutil = psutil.Process(self.pid).name().lower()
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# ...because of how we calculate PYTHON_EXE; on MACOS this may
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# be "pythonX.Y".
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name_ps = re.sub(r"\d.\d", "", name_ps)
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name_psutil = re.sub(r"\d.\d", "", name_psutil)
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# ...may also be "python.X"
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name_ps = re.sub(r"\d", "", name_ps)
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name_psutil = re.sub(r"\d", "", name_psutil)
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self.assertEqual(name_ps, name_psutil)
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def test_name_long(self):
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# On UNIX the kernel truncates the name to the first 15
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# characters. In such a case psutil tries to determine the
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# full name from the cmdline.
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name = "long-program-name"
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cmdline = ["long-program-name-extended", "foo", "bar"]
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with mock.patch("psutil._psplatform.Process.name",
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return_value=name):
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with mock.patch("psutil._psplatform.Process.cmdline",
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return_value=cmdline):
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p = psutil.Process()
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self.assertEqual(p.name(), "long-program-name-extended")
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def test_name_long_cmdline_ad_exc(self):
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# Same as above but emulates a case where cmdline() raises
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# AccessDenied in which case psutil is supposed to return
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# the truncated name instead of crashing.
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name = "long-program-name"
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with mock.patch("psutil._psplatform.Process.name",
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return_value=name):
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with mock.patch("psutil._psplatform.Process.cmdline",
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side_effect=psutil.AccessDenied(0, "")):
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p = psutil.Process()
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self.assertEqual(p.name(), "long-program-name")
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def test_name_long_cmdline_nsp_exc(self):
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# Same as above but emulates a case where cmdline() raises NSP
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# which is supposed to propagate.
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name = "long-program-name"
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with mock.patch("psutil._psplatform.Process.name",
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return_value=name):
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with mock.patch("psutil._psplatform.Process.cmdline",
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side_effect=psutil.NoSuchProcess(0, "")):
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p = psutil.Process()
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self.assertRaises(psutil.NoSuchProcess, p.name)
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@unittest.skipIf(MACOS or BSD, 'ps -o start not available')
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def test_create_time(self):
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time_ps = ps('start', self.pid)
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time_psutil = psutil.Process(self.pid).create_time()
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time_psutil_tstamp = datetime.datetime.fromtimestamp(
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time_psutil).strftime("%H:%M:%S")
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# sometimes ps shows the time rounded up instead of down, so we check
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# for both possible values
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round_time_psutil = round(time_psutil)
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round_time_psutil_tstamp = datetime.datetime.fromtimestamp(
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round_time_psutil).strftime("%H:%M:%S")
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self.assertIn(time_ps, [time_psutil_tstamp, round_time_psutil_tstamp])
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def test_exe(self):
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ps_pathname = ps_name(self.pid)
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psutil_pathname = psutil.Process(self.pid).exe()
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try:
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self.assertEqual(ps_pathname, psutil_pathname)
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except AssertionError:
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# certain platforms such as BSD are more accurate returning:
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# "/usr/local/bin/python2.7"
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# ...instead of:
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# "/usr/local/bin/python"
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# We do not want to consider this difference in accuracy
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# an error.
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adjusted_ps_pathname = ps_pathname[:len(ps_pathname)]
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self.assertEqual(ps_pathname, adjusted_ps_pathname)
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def test_cmdline(self):
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ps_cmdline = ps_args(self.pid)
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psutil_cmdline = " ".join(psutil.Process(self.pid).cmdline())
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self.assertEqual(ps_cmdline, psutil_cmdline)
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# On SUNOS "ps" reads niceness /proc/pid/psinfo which returns an
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# incorrect value (20); the real deal is getpriority(2) which
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# returns 0; psutil relies on it, see:
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# https://github.com/giampaolo/psutil/issues/1082
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# AIX has the same issue
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@unittest.skipIf(SUNOS, "not reliable on SUNOS")
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@unittest.skipIf(AIX, "not reliable on AIX")
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def test_nice(self):
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ps_nice = ps('nice', self.pid)
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psutil_nice = psutil.Process().nice()
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self.assertEqual(ps_nice, psutil_nice)
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def test_num_fds(self):
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# Note: this fails from time to time; I'm keen on thinking
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# it doesn't mean something is broken
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def call(p, attr):
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args = ()
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attr = getattr(p, name, None)
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if attr is not None and callable(attr):
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if name == 'rlimit':
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args = (psutil.RLIMIT_NOFILE,)
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attr(*args)
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else:
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attr
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p = psutil.Process(os.getpid())
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failures = []
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ignored_names = ['terminate', 'kill', 'suspend', 'resume', 'nice',
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'send_signal', 'wait', 'children', 'as_dict',
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'memory_info_ex', 'parent', 'parents']
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if LINUX and get_kernel_version() < (2, 6, 36):
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ignored_names.append('rlimit')
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if LINUX and get_kernel_version() < (2, 6, 23):
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ignored_names.append('num_ctx_switches')
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for name in dir(psutil.Process):
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if (name.startswith('_') or name in ignored_names):
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continue
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else:
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try:
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num1 = p.num_fds()
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for x in range(2):
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call(p, name)
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num2 = p.num_fds()
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except psutil.AccessDenied:
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pass
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else:
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if abs(num2 - num1) > 1:
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fail = "failure while processing Process.%s method " \
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"(before=%s, after=%s)" % (name, num1, num2)
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failures.append(fail)
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if failures:
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self.fail('\n' + '\n'.join(failures))
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@unittest.skipIf(not POSIX, "POSIX only")
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class TestSystemAPIs(unittest.TestCase):
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"""Test some system APIs."""
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@retry_on_failure()
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def test_pids(self):
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# Note: this test might fail if the OS is starting/killing
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# other processes in the meantime
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pids_ps = sorted(ps("pid"))
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pids_psutil = psutil.pids()
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# on MACOS and OPENBSD ps doesn't show pid 0
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if MACOS or OPENBSD and 0 not in pids_ps:
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pids_ps.insert(0, 0)
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# There will often be one more process in pids_ps for ps itself
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if len(pids_ps) - len(pids_psutil) > 1:
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difference = [x for x in pids_psutil if x not in pids_ps] + \
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[x for x in pids_ps if x not in pids_psutil]
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self.fail("difference: " + str(difference))
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# for some reason ifconfig -a does not report all interfaces
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# returned by psutil
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@unittest.skipIf(SUNOS, "unreliable on SUNOS")
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@unittest.skipIf(TRAVIS, "unreliable on TRAVIS")
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@unittest.skipIf(not which('ifconfig'), "no ifconfig cmd")
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@unittest.skipIf(not HAS_NET_IO_COUNTERS, "not supported")
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def test_nic_names(self):
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output = sh("ifconfig -a")
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for nic in psutil.net_io_counters(pernic=True).keys():
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for line in output.split():
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if line.startswith(nic):
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break
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else:
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self.fail(
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"couldn't find %s nic in 'ifconfig -a' output\n%s" % (
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nic, output))
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# can't find users on APPVEYOR or TRAVIS
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@unittest.skipIf(APPVEYOR or TRAVIS and not psutil.users(),
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"unreliable on APPVEYOR or TRAVIS")
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@retry_on_failure()
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def test_users(self):
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out = sh("who")
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lines = out.split('\n')
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users = [x.split()[0] for x in lines]
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terminals = [x.split()[1] for x in lines]
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self.assertEqual(len(users), len(psutil.users()))
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for u in psutil.users():
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self.assertIn(u.name, users)
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self.assertIn(u.terminal, terminals)
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def test_pid_exists_let_raise(self):
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# According to "man 2 kill" possible error values for kill
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# are (EINVAL, EPERM, ESRCH). Test that any other errno
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# results in an exception.
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with mock.patch("psutil._psposix.os.kill",
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side_effect=OSError(errno.EBADF, "")) as m:
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self.assertRaises(OSError, psutil._psposix.pid_exists, os.getpid())
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assert m.called
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def test_os_waitpid_let_raise(self):
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# os.waitpid() is supposed to catch EINTR and ECHILD only.
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# Test that any other errno results in an exception.
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with mock.patch("psutil._psposix.os.waitpid",
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side_effect=OSError(errno.EBADF, "")) as m:
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self.assertRaises(OSError, psutil._psposix.wait_pid, os.getpid())
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assert m.called
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def test_os_waitpid_eintr(self):
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# os.waitpid() is supposed to "retry" on EINTR.
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with mock.patch("psutil._psposix.os.waitpid",
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side_effect=OSError(errno.EINTR, "")) as m:
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self.assertRaises(
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psutil._psposix.TimeoutExpired,
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psutil._psposix.wait_pid, os.getpid(), timeout=0.01)
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assert m.called
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def test_os_waitpid_bad_ret_status(self):
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# Simulate os.waitpid() returning a bad status.
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with mock.patch("psutil._psposix.os.waitpid",
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return_value=(1, -1)) as m:
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self.assertRaises(ValueError,
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psutil._psposix.wait_pid, os.getpid())
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assert m.called
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# AIX can return '-' in df output instead of numbers, e.g. for /proc
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@unittest.skipIf(AIX, "unreliable on AIX")
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def test_disk_usage(self):
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def df(device):
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out = sh("df -k %s" % device).strip()
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line = out.split('\n')[1]
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fields = line.split()
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total = int(fields[1]) * 1024
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used = int(fields[2]) * 1024
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free = int(fields[3]) * 1024
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percent = float(fields[4].replace('%', ''))
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return (total, used, free, percent)
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tolerance = 4 * 1024 * 1024 # 4MB
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for part in psutil.disk_partitions(all=False):
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usage = psutil.disk_usage(part.mountpoint)
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try:
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total, used, free, percent = df(part.device)
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except RuntimeError as err:
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# see:
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# https://travis-ci.org/giampaolo/psutil/jobs/138338464
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# https://travis-ci.org/giampaolo/psutil/jobs/138343361
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err = str(err).lower()
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if "no such file or directory" in err or \
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"raw devices not supported" in err or \
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"permission denied" in err:
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continue
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else:
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raise
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else:
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self.assertAlmostEqual(usage.total, total, delta=tolerance)
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self.assertAlmostEqual(usage.used, used, delta=tolerance)
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self.assertAlmostEqual(usage.free, free, delta=tolerance)
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self.assertAlmostEqual(usage.percent, percent, delta=1)
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if __name__ == '__main__':
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from psutil.tests.runner import run
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run(__file__)
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