diff options
Diffstat (limited to 'cloudinit/util.py')
| -rw-r--r-- | cloudinit/util.py | 39 |
1 files changed, 29 insertions, 10 deletions
diff --git a/cloudinit/util.py b/cloudinit/util.py index 830c8e54..76d7db78 100644 --- a/cloudinit/util.py +++ b/cloudinit/util.py @@ -10,7 +10,6 @@ import contextlib import copy as obj_copy -import ctypes import email import glob import grp @@ -1807,6 +1806,33 @@ def time_rfc2822(): return ts +def boottime(): + """Use sysctlbyname(3) via ctypes to find kern.boottime + + kern.boottime is of type struct timeval. Here we create a + private class to easier unpack it. + + @return boottime: float to be compatible with linux + """ + import ctypes + + NULL_BYTES = b"\x00" + + class timeval(ctypes.Structure): + _fields_ = [ + ("tv_sec", ctypes.c_int64), + ("tv_usec", ctypes.c_int64) + ] + libc = ctypes.CDLL('/lib/libc.so.7') + size = ctypes.c_size_t() + size.value = ctypes.sizeof(timeval) + buf = timeval() + if libc.sysctlbyname(b"kern.boottime" + NULL_BYTES, ctypes.byref(buf), + ctypes.byref(size), None, 0) != -1: + return buf.tv_sec + buf.tv_usec / 1000000.0 + raise RuntimeError("Unable to retrieve kern.boottime on this system") + + def uptime(): uptime_str = '??' method = 'unknown' @@ -1818,15 +1844,8 @@ def uptime(): uptime_str = contents.split()[0] else: method = 'ctypes' - libc = ctypes.CDLL('/lib/libc.so.7') - size = ctypes.c_size_t() - buf = ctypes.c_int() - size.value = ctypes.sizeof(buf) - libc.sysctlbyname("kern.boottime", ctypes.byref(buf), - ctypes.byref(size), None, 0) - now = time.time() - bootup = buf.value - uptime_str = now - bootup + # This is the *BSD codepath + uptime_str = str(time.time() - boottime()) except Exception: logexc(LOG, "Unable to read uptime using method: %s" % method) |