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# Courtesy of Armin Ronacher, found at StackOverflow
import ctypes
import os
CLOCK_MONOTONIC = 1 # see <linux/time.h>
class _timespec(ctypes.Structure):
_fields_ = [
('tv_sec', ctypes.c_long),
('tv_nsec', ctypes.c_long)
]
_librt = ctypes.CDLL('librt.so.1', use_errno=True)
_libc = ctypes.CDLL('libc.so.6', use_errno=True)
_clock_gettime = _librt.clock_gettime
_clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(_timespec)]
_if_nametoindex = _libc.if_nametoindex
_if_nametoindex.argtype = [ctypes.c_uint, ctypes.c_char_p]
def now():
t = _timespec()
if _clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(t)) != 0:
errno_ = ctypes.get_errno()
raise OSError(errno_, os.strerror(errno_))
return t.tv_sec + t.tv_nsec * 1e-9
def if_nametoindex(interfaceName):
rv = _if_nametoindex(interfaceName)
if rv == 0:
errno_= ctypes.get_errno()
raise OSError(errno_, os.strerror(errno_))
return rv
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