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SetLocalTime() and SetSystemTime() bugfixes. Added a maximum clock

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adjustment of 2 minutes just in case...
This commit is contained in:
Rein Klazes 2000-04-16 17:05:36 +00:00 committed by Alexandre Julliard
parent b2dd2c5cee
commit 14e5252185
1 changed files with 69 additions and 17 deletions
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86
win32/time.c
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@ -14,6 +14,20 @@
DEFAULT_DEBUG_CHANNEL(win32)
/* maximum time adjustment in seconds for SetLocalTime and SetSystemTime */
#define SETTIME_MAX_ADJUST 120
/* TIME_GetBias: helper function calculates delta local time from UTC */
static int TIME_GetBias( time_t utc, int *pdaylight)
{
struct tm *ptm = localtime(&utc);
*pdaylight = ptm->tm_isdst; /* daylight for local timezone */
ptm = gmtime(&utc);
ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
return (int)(utc-mktime(ptm));
}
/***********************************************************************
* GetLocalTime (KERNEL32.228)
*/
@ -49,20 +63,39 @@ BOOL WINAPI SetLocalTime(const SYSTEMTIME *systime)
struct timeval tv;
struct tm t;
time_t sec;
time_t oldsec=time(NULL);
int err;
/* get the number of seconds */
t.tm_sec = systime->wSecond;
t.tm_min = systime->wMinute;
t.tm_hour = systime->wHour;
t.tm_mday = systime->wDay;
t.tm_mon = systime->wMonth;
t.tm_year = systime->wYear;
t.tm_mon = systime->wMonth - 1;
t.tm_year = systime->wYear - 1900;
t.tm_isdst = -1;
sec = mktime (&t);
/* set the new time */
tv.tv_sec = sec;
tv.tv_usec = systime->wMilliseconds * 1000;
return !settimeofday(&tv, NULL);
/* error and sanity check*/
if( sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST ){
err = 1;
SetLastError(ERROR_INVALID_PARAMETER);
} else {
err=settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
if(err == 0)
return TRUE;
SetLastError(ERROR_PRIVILEGE_NOT_HELD);
}
ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
systime->wYear, systime->wMonth, systime->wDay, systime->wHour,
systime->wMinute, systime->wSecond,
sec-oldsec, err == -1 ? "No Permission" :
sec==(time_t)-1 ? "" : "is too large." );
return FALSE;
}
@ -98,24 +131,49 @@ BOOL WINAPI SetSystemTime(const SYSTEMTIME *systime)
struct timeval tv;
struct timezone tz;
struct tm t;
time_t sec;
time_t sec, oldsec;
int dst, bias;
int err;
/* call gettimeofday to get the current timezone */
gettimeofday(&tv, &tz);
oldsec=tv.tv_sec;
/* get delta local time from utc */
bias=TIME_GetBias(oldsec,&dst);
/* get the number of seconds */
t.tm_sec = systime->wSecond;
t.tm_min = systime->wMinute;
t.tm_hour = systime->wHour;
t.tm_mday = systime->wDay;
t.tm_mon = systime->wMonth;
t.tm_year = systime->wYear;
t.tm_mon = systime->wMonth - 1;
t.tm_year = systime->wYear - 1900;
t.tm_isdst = dst;
sec = mktime (&t);
/* correct for timezone and daylight */
sec += bias;
/* set the new time */
tv.tv_sec = sec;
tv.tv_usec = systime->wMilliseconds * 1000;
return !settimeofday(&tv, &tz);
/* error and sanity check*/
if( sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST ){
err = 1;
SetLastError(ERROR_INVALID_PARAMETER);
} else {
err=settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
if(err == 0)
return TRUE;
SetLastError(ERROR_PRIVILEGE_NOT_HELD);
}
ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
systime->wYear, systime->wMonth, systime->wDay, systime->wHour,
systime->wMinute, systime->wSecond,
sec-oldsec, err == -1 ? "No Permission" :
sec==(time_t)-1 ? "" : "is too large." );
return FALSE;
}
@ -124,21 +182,15 @@ BOOL WINAPI SetSystemTime(const SYSTEMTIME *systime)
*/
DWORD WINAPI GetTimeZoneInformation(LPTIME_ZONE_INFORMATION tzinfo)
{
time_t gmt, lt;
struct tm *ptm;
int daylight;
time_t gmt;
int bias, daylight;
memset(tzinfo, 0, sizeof(TIME_ZONE_INFORMATION));
gmt = time(NULL);
ptm=localtime(&gmt);
daylight=ptm->tm_isdst;
ptm = gmtime(&gmt);
ptm->tm_isdst=daylight;
lt = mktime(ptm);
bias=TIME_GetBias(gmt,&daylight);
tzinfo->Bias = (lt - gmt) / 60;
tzinfo->Bias = -bias / 60;
tzinfo->StandardBias = 0;
tzinfo->DaylightBias = -60;