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based on microsoft's description,the direct convert from FILETIME struct to __int64 is unsafe.

Browse source 
via http://technet.microsoft.com/en-us/library/ms724284(v=vs.85).aspx

"Do not cast a pointer to a FILETIME structure to either a
ULARGE_INTEGER* or __int64* value because it can cause alignment faults on 64-bit Windows."
This commit is contained in:
slayercat 2012-05-23 20:30:16 +08:00 • committed by Xinchen Hui
parent c1ac325228
commit d9810af45a
1 changed files with 12 additions and 2 deletions
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14
win32/time.c
View file

@ -1,4 +1,3 @@
/*****************************************************************************
* *
* DH_TIME.C *
@ -37,10 +36,21 @@ int getfilesystemtime(struct timeval *time_Info)
{
FILETIME ft;
__int64 ff;
ULARGE_INTEGER convFromft;
GetSystemTimeAsFileTime(&ft); /* 100 ns blocks since 01-Jan-1641 */
/* resolution seems to be 0.01 sec */
ff = *(__int64*)(&ft);
/* ff = *(__int64*)(&ft); */
/*
Do not cast a pointer to a FILETIME structure to either a
ULARGE_INTEGER* or __int64* value because it can cause alignment faults on 64-bit Windows.
via http://technet.microsoft.com/en-us/library/ms724284(v=vs.85).aspx
*/
convFromft.HighPart = ft.dwHighDateTime;
convFromft.LowPart = ft.dwLowDateTime;
ff = convFromft.QuadPart;
time_Info->tv_sec = (int)(ff/(__int64)10000000-(__int64)11644473600);
time_Info->tv_usec = (int)(ff % 10000000)/10;
return 0;