119e828dbe
According to the D-Bus API specification we return CLOCK_BOOTTIME only. We don't support kernels too old to have it -- the fall back to CLOCK_MONOTONIC is only there to be able to run unit tests on RHEL 6 kernel and will eventually go away.
63 lines
2.2 KiB
Python
63 lines
2.2 KiB
Python
#!/usr/bin/env python
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# -*- Mode: Python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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# vim: ft=python ts=4 sts=4 sw=4 et ai
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Copyright 2018 Red Hat, Inc.
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###############################################################################
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# nmex.py contains helper functions used by some examples. The helper functions
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# should be simple and independent, so that the user can extract them easily
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# when modifying the example to his needs.
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###############################################################################
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def _sys_clock_gettime_ns_lazy():
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import ctypes
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class timespec(ctypes.Structure):
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_fields_ = [
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('tv_sec', ctypes.c_long),
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('tv_nsec', ctypes.c_long)
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]
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librt = ctypes.CDLL('librt.so.1', use_errno=True)
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clock_gettime = librt.clock_gettime
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clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
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t = timespec()
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def f(clock_id):
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if clock_gettime(clock_id, ctypes.pointer(t)) != 0:
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import os
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errno_ = ctypes.get_errno()
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raise OSError(errno_, os.strerror(errno_))
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return (t.tv_sec * 1000000000) + t.tv_nsec
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return f
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_sys_clock_gettime_ns = None
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# call POSIX clock_gettime() and return it as integer (in nanoseconds)
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def sys_clock_gettime_ns(clock_id):
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global _sys_clock_gettime_ns
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if _sys_clock_gettime_ns is None:
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_sys_clock_gettime_ns = _sys_clock_gettime_ns_lazy()
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return _sys_clock_gettime_ns(clock_id)
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def nm_boot_time_ns():
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CLOCK_BOOTTIME = 7
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return sys_clock_gettime_ns(CLOCK_BOOTTIME)
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def nm_boot_time_us():
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return nm_boot_time_ns() / 1000
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def nm_boot_time_ms():
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return nm_boot_time_ns() / 1000000
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def nm_boot_time_s():
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return nm_boot_time_ns() / 1000000000
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###############################################################################
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