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#!/usr/bin/env python
# -*- Mode: Python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
# vim: ft=python ts=4 sts=4 sw=4 et ai
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Copyright 2018 Red Hat, Inc.
###############################################################################
# nmex.py contains helper functions used by some examples. The helper functions
# should be simple and independent, so that the user can extract them easily
# when modifying the example to his needs.
###############################################################################
def _sys_clock_gettime_ns_lazy():
import ctypes
class timespec(ctypes.Structure):
_fields_ = [
('tv_sec', ctypes.c_long),
('tv_nsec', ctypes.c_long)
]
librt = ctypes.CDLL('librt.so.1', use_errno=True)
clock_gettime = librt.clock_gettime
clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
t = timespec()
def f(clock_id):
if clock_gettime(clock_id, ctypes.pointer(t)) != 0:
import os
errno_ = ctypes.get_errno()
raise OSError(errno_, os.strerror(errno_))
return (t.tv_sec * 1000000000) + t.tv_nsec
return f
_sys_clock_gettime_ns = None
# call POSIX clock_gettime() and return it as integer (in nanoseconds)
def sys_clock_gettime_ns(clock_id):
global _sys_clock_gettime_ns
if _sys_clock_gettime_ns is None:
_sys_clock_gettime_ns = _sys_clock_gettime_ns_lazy()
return _sys_clock_gettime_ns(clock_id)
def nm_boot_time_ns():
# NetworkManager exposes some timestamps as CLOCK_BOOTTIME.
# Try that first (number 7).
try:
return sys_clock_gettime_ns(7)
except OSError as e:
# On systems, where this is not available, fallback to
# CLOCK_MONOTONIC (numeric 1).
# That is what NetworkManager does as well.
import errno
if e.errno == errno.EINVAL:
return sys_clock_gettime_ns(1)
raise
def nm_boot_time_us():
return nm_boot_time_ns() / 1000
def nm_boot_time_ms():
return nm_boot_time_ns() / 1000000
def nm_boot_time_s():
return nm_boot_time_ns() / 1000000000
###############################################################################
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