test_posix.py 文件源码

def test_pids(self):
        # Note: this test might fail if the OS is starting/killing
        # other processes in the meantime
        if SUNOS:
            cmd = ["ps", "-A", "-o", "pid"]
        else:
            cmd = ["ps", "ax", "-o", "pid"]
        p = get_test_subprocess(cmd, stdout=subprocess.PIPE)
        output = p.communicate()[0].strip()
        assert p.poll() == 0
        if PY3:
            output = str(output, sys.stdout.encoding)
        pids_ps = []
        for line in output.split('\n')[1:]:
            if line:
                pid = int(line.split()[0].strip())
                pids_ps.append(pid)
        # remove ps subprocess pid which is supposed to be dead in meantime
        pids_ps.remove(p.pid)
        pids_psutil = psutil.pids()
        pids_ps.sort()
        pids_psutil.sort()

        # on OSX ps doesn't show pid 0
        if OSX and 0 not in pids_ps:
            pids_ps.insert(0, 0)

        if pids_ps != pids_psutil:
            difference = [x for x in pids_psutil if x not in pids_ps] + \
                         [x for x in pids_ps if x not in pids_psutil]
            self.fail("difference: " + str(difference))

    # for some reason ifconfig -a does not report all interfaces
    # returned by psutil