/* times.cc Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Red Hat, Inc. This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #define __timezonefunc__ #include "winsup.h" #include #include #include #include #include "cygerrno.h" #include "security.h" #include "path.h" #include "fhandler.h" #include "dtable.h" #include "cygheap.h" #include "pinfo.h" #include "cygtls.h" #include "ntdll.h" /* 100ns difference between WIndows and UNIX timebase. */ #define FACTOR (0x19db1ded53e8000LL) /* # of 100ns intervals per second. */ #define NSPERSEC 10000000LL /* Max allowed diversion in 100ns of internal timer from system time. If this difference is exceeded, the internal timer gets re-primed. */ #define JITTER (40 * 10000LL) /* TODO: Putting this variable in the shared cygwin region partially solves the problem of cygwin processes not recognizing date changes when other cygwin processes set the date. There is still an additional problem of long-running cygwin processes becoming confused when a non-cygwin process sets the date. Unfortunately, it looks like a minor redesign is required to handle that case. */ hires_ms gtod __attribute__((section (".cygwin_dll_common"), shared)); hires_ns NO_COPY ntod; static inline LONGLONG systime_ns () { LARGE_INTEGER x; GetSystemTimeAsFileTime ((LPFILETIME) &x); x.QuadPart -= FACTOR; /* Add conversion factor for UNIX vs. Windows base time */ return x.QuadPart; } /* Cygwin internal */ static unsigned long long __stdcall __to_clock_t (FILETIME *src, int flag) { unsigned long long total = ((unsigned long long) src->dwHighDateTime << 32) + ((unsigned)src->dwLowDateTime); syscall_printf ("dwHighDateTime %u, dwLowDateTime %u", src->dwHighDateTime, src->dwLowDateTime); /* Convert into clock ticks - the total is in 10ths of a usec. */ if (flag) total -= FACTOR; total /= (unsigned long long) (NSPERSEC / CLOCKS_PER_SEC); syscall_printf ("total %08x %08x", (unsigned) (total>>32), (unsigned) (total)); return total; } /* times: POSIX 4.5.2.1 */ extern "C" clock_t times (struct tms *buf) { FILETIME creation_time, exit_time, kernel_time, user_time; myfault efault; if (efault.faulted (EFAULT)) return ((clock_t) -1); LONGLONG ticks = gtod.uptime (); /* Ticks is in milliseconds, convert to our ticks. Use long long to prevent overflow. */ clock_t tc = (clock_t) (ticks * CLOCKS_PER_SEC / 1000); GetProcessTimes (GetCurrentProcess (), &creation_time, &exit_time, &kernel_time, &user_time); syscall_printf ("ticks %d, CLOCKS_PER_SEC %d", ticks, CLOCKS_PER_SEC); syscall_printf ("user_time %d, kernel_time %d, creation_time %d, exit_time %d", user_time, kernel_time, creation_time, exit_time); buf->tms_stime = __to_clock_t (&kernel_time, 0); buf->tms_utime = __to_clock_t (&user_time, 0); timeval_to_filetime (&myself->rusage_children.ru_stime, &kernel_time); buf->tms_cstime = __to_clock_t (&kernel_time, 1); timeval_to_filetime (&myself->rusage_children.ru_utime, &user_time); buf->tms_cutime = __to_clock_t (&user_time, 1); return tc; } EXPORT_ALIAS (times, _times) /* settimeofday: BSD */ extern "C" int settimeofday (const struct timeval *tv, const struct timezone *tz) { SYSTEMTIME st; struct tm *ptm; int res; tz = tz; /* silence warning about unused variable */ ptm = gmtime (&tv->tv_sec); st.wYear = ptm->tm_year + 1900; st.wMonth = ptm->tm_mon + 1; st.wDayOfWeek = ptm->tm_wday; st.wDay = ptm->tm_mday; st.wHour = ptm->tm_hour; st.wMinute = ptm->tm_min; st.wSecond = ptm->tm_sec; st.wMilliseconds = tv->tv_usec / 1000; res = !SetSystemTime (&st); gtod.reset (); syscall_printf ("%d = settimeofday (%x, %x)", res, tv, tz); return res; } /* timezone: standards? */ extern "C" char * timezone (void) { char *b = _my_tls.locals.timezone_buf; tzset (); __small_sprintf (b,"GMT%+d:%02d", (int) (-_timezone / 3600), (int) (abs (_timezone / 60) % 60)); return b; } /* Cygwin internal */ void __stdcall totimeval (struct timeval *dst, FILETIME *src, int sub, int flag) { long long x = __to_clock_t (src, flag); x *= (int) (1e6) / CLOCKS_PER_SEC; /* Turn x into usecs */ x -= (long long) sub * (int) (1e6); dst->tv_usec = x % (long long) (1e6); /* And split */ dst->tv_sec = x / (long long) (1e6); } /* FIXME: Make thread safe */ extern "C" int gettimeofday (struct timeval *tv, void *tzvp) { struct timezone *tz = (struct timezone *) tzvp; static bool tzflag; LONGLONG now = gtod.usecs (); if (now == (LONGLONG) -1) return -1; tv->tv_sec = now / 1000000; tv->tv_usec = now % 1000000; if (tz != NULL) { if (!tzflag) { tzset (); tzflag = true; } tz->tz_minuteswest = _timezone / 60; tz->tz_dsttime = _daylight; } return 0; } EXPORT_ALIAS (gettimeofday, _gettimeofday) /* Cygwin internal */ void time_t_to_filetime (time_t time_in, FILETIME *out) { long long x = time_in * NSPERSEC + FACTOR; out->dwHighDateTime = x >> 32; out->dwLowDateTime = x; } /* Cygwin internal */ void __stdcall timespec_to_filetime (const struct timespec *time_in, FILETIME *out) { if (time_in->tv_nsec == UTIME_OMIT) out->dwHighDateTime = out->dwLowDateTime = 0; else { long long x = time_in->tv_sec * NSPERSEC + time_in->tv_nsec / (1000000000/NSPERSEC) + FACTOR; out->dwHighDateTime = x >> 32; out->dwLowDateTime = x; } } /* Cygwin internal */ void __stdcall timeval_to_filetime (const struct timeval *time_in, FILETIME *out) { long long x = time_in->tv_sec * NSPERSEC + time_in->tv_usec * (NSPERSEC/1000000) + FACTOR; out->dwHighDateTime = x >> 32; out->dwLowDateTime = x; } /* Cygwin internal */ static timeval __stdcall time_t_to_timeval (time_t in) { timeval res; res.tv_sec = in; res.tv_usec = 0; return res; } /* Cygwin internal */ static const struct timespec * timeval_to_timespec (const struct timeval *tvp, struct timespec *tmp) { if (!tvp) return NULL; tmp[0].tv_sec = tvp[0].tv_sec; tmp[0].tv_nsec = tvp[0].tv_usec * 1000; if (tmp[0].tv_nsec < 0) tmp[0].tv_nsec = 0; else if (tmp[0].tv_nsec > 999999999) tmp[0].tv_nsec = 999999999; tmp[1].tv_sec = tvp[1].tv_sec; tmp[1].tv_nsec = tvp[1].tv_usec * 1000; if (tmp[1].tv_nsec < 0) tmp[1].tv_nsec = 0; else if (tmp[1].tv_nsec > 999999999) tmp[1].tv_nsec = 999999999; return tmp; } /* Cygwin internal */ /* Convert a Win32 time to "UNIX" format. */ long __stdcall to_time_t (FILETIME *ptr) { /* A file time is the number of 100ns since jan 1 1601 stuffed into two long words. A time_t is the number of seconds since jan 1 1970. */ long long x = ((long long) ptr->dwHighDateTime << 32) + ((unsigned)ptr->dwLowDateTime); /* pass "no time" as epoch */ if (x == 0) return 0; x -= FACTOR; /* number of 100ns between 1601 and 1970 */ x /= (long long) NSPERSEC; /* number of 100ns in a second */ return x; } /* Cygwin internal */ /* Convert a Win32 time to "UNIX" timestruc_t format. */ void __stdcall to_timestruc_t (FILETIME *ptr, timestruc_t *out) { /* A file time is the number of 100ns since jan 1 1601 stuffed into two long words. A timestruc_t is the number of seconds and microseconds since jan 1 1970 stuffed into a time_t and a long. */ long rem; long long x = ((long long) ptr->dwHighDateTime << 32) + ((unsigned)ptr->dwLowDateTime); /* pass "no time" as epoch */ if (x == 0) { out->tv_sec = 0; out->tv_nsec = 0; return; } x -= FACTOR; /* number of 100ns between 1601 and 1970 */ rem = x % ((long long)NSPERSEC); x /= (long long) NSPERSEC; /* number of 100ns in a second */ out->tv_nsec = rem * 100; /* as tv_nsec is in nanoseconds */ out->tv_sec = x; } /* Cygwin internal */ /* Get the current time as a "UNIX" timestruc_t format. */ void __stdcall time_as_timestruc_t (timestruc_t * out) { FILETIME filetime; GetSystemTimeAsFileTime (&filetime); to_timestruc_t (&filetime, out); } /* time: POSIX 4.5.1.1, C 4.12.2.4 */ /* Return number of seconds since 00:00 UTC on jan 1, 1970 */ extern "C" time_t time (time_t * ptr) { time_t res; FILETIME filetime; GetSystemTimeAsFileTime (&filetime); res = to_time_t (&filetime); if (ptr) *ptr = res; syscall_printf ("%d = time (%x)", res, ptr); return res; } int utimens_worker (path_conv &win32, const struct timespec *tvp) { int res = -1; if (win32.error) set_errno (win32.error); else { fhandler_base *fh = NULL; bool fromfd = false; cygheap_fdenum cfd (true); while (cfd.next () >= 0) if (cfd->get_access () & (FILE_WRITE_ATTRIBUTES | GENERIC_WRITE) && RtlEqualUnicodeString (cfd->pc.get_nt_native_path (), win32.get_nt_native_path (), cfd->pc.objcaseinsensitive ())) { fh = cfd; fromfd = true; break; } if (!fh) { if (!(fh = build_fh_pc (win32))) goto error; if (fh->error ()) { debug_printf ("got %d error from build_fh_pc", fh->error ()); set_errno (fh->error ()); } } res = fh->utimens (tvp); if (!fromfd) delete fh; } error: syscall_printf ("%d = utimes (%S, %p)", res, win32.get_nt_native_path (), tvp); return res; } /* utimes: POSIX/SUSv3 */ extern "C" int utimes (const char *path, const struct timeval *tvp) { path_conv win32 (path, PC_POSIX | PC_SYM_FOLLOW, stat_suffixes); struct timespec tmp[2]; return utimens_worker (win32, timeval_to_timespec (tvp, tmp)); } /* BSD */ extern "C" int lutimes (const char *path, const struct timeval *tvp) { path_conv win32 (path, PC_POSIX | PC_SYM_NOFOLLOW, stat_suffixes); struct timespec tmp[2]; return utimens_worker (win32, timeval_to_timespec (tvp, tmp)); } /* futimens: POSIX/SUSv4 */ extern "C" int futimens (int fd, const struct timespec *tvp) { int res; cygheap_fdget cfd (fd); if (cfd < 0) res = -1; else if (cfd->get_access () & (FILE_WRITE_ATTRIBUTES | GENERIC_WRITE)) res = cfd->utimens (tvp); else res = utimens_worker (cfd->pc, tvp); syscall_printf ("%d = futimens (%d, %p)", res, fd, tvp); return res; } /* BSD */ extern "C" int futimes (int fd, const struct timeval *tvp) { struct timespec tmp[2]; return futimens (fd, timeval_to_timespec (tvp, tmp)); } /* utime: POSIX 5.6.6.1 */ extern "C" int utime (const char *path, const struct utimbuf *buf) { struct timeval tmp[2]; if (buf == 0) return utimes (path, 0); debug_printf ("incoming utime act %x", buf->actime); tmp[0] = time_t_to_timeval (buf->actime); tmp[1] = time_t_to_timeval (buf->modtime); return utimes (path, tmp); } /* ftime: standards? */ extern "C" int ftime (struct timeb *tp) { struct timeval tv; struct timezone tz; if (gettimeofday (&tv, &tz) < 0) return -1; tp->time = tv.tv_sec; tp->millitm = tv.tv_usec / 1000; tp->timezone = tz.tz_minuteswest; tp->dstflag = tz.tz_dsttime; return 0; } #define stupid_printf if (cygwin_finished_initializing) debug_printf void hires_ns::prime () { LARGE_INTEGER ifreq; if (!QueryPerformanceFrequency (&ifreq)) { inited = -1; return; } int priority = GetThreadPriority (GetCurrentThread ()); SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_TIME_CRITICAL); if (!QueryPerformanceCounter (&primed_pc)) { SetThreadPriority (GetCurrentThread (), priority); inited = -1; return; } freq = (double) ((double) 1000000000. / (double) ifreq.QuadPart); inited = true; SetThreadPriority (GetCurrentThread (), priority); } LONGLONG hires_ns::nsecs () { if (!inited) prime (); if (inited < 0) { set_errno (ENOSYS); return (long long) -1; } LARGE_INTEGER now; if (!QueryPerformanceCounter (&now)) { set_errno (ENOSYS); return -1; } // FIXME: Use round() here? now.QuadPart = (LONGLONG) (freq * (double) (now.QuadPart - primed_pc.QuadPart)); return now.QuadPart; } LONGLONG hires_ms::timeGetTime_ns () { LARGE_INTEGER t; /* This is how timeGetTime is implemented in winmm.dll. The real timeGetTime subtracts and adds some values which are constant over the lifetime of the process. Since we don't need absolute accuracy of the value returned by timeGetTime, only relative accuracy, we can skip this step. However, if we ever find out that we need absolute accuracy, here's how it works in it's full beauty: - At process startup, winmm initializes two calibration values: DWORD tick_count_start; LARGE_INTEGER int_time_start; do { tick_count_start = GetTickCount (); do { int_time_start.HighPart = SharedUserData.InterruptTime.High1Time; int_time_start.LowPart = SharedUserData.InterruptTime.LowPart; } while (int_time_start.HighPart != SharedUserData.InterruptTime.High2Time); } while (tick_count_start != GetTickCount (); - timeGetTime computes its return value in the loop as below, and then: t.QuadPart -= int_time_start.QuadPart; t.QuadPart /= 10000; t.LowPart += tick_count_start; return t.LowPart; */ do { t.HighPart = SharedUserData.InterruptTime.High1Time; t.LowPart = SharedUserData.InterruptTime.LowPart; } while (t.HighPart != SharedUserData.InterruptTime.High2Time); /* We use the value in full 100ns resolution in the calling functions anyway, so we can skip dividing by 10000 here. */ return t.QuadPart; } void hires_ms::prime () { if (!inited) { int priority = GetThreadPriority (GetCurrentThread ()); SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_TIME_CRITICAL); initime_ns = systime_ns () - timeGetTime_ns (); inited = true; SetThreadPriority (GetCurrentThread (), priority); } return; } LONGLONG hires_ms::nsecs () { if (!inited) prime (); LONGLONG t = systime_ns (); LONGLONG res = initime_ns + timeGetTime_ns (); if (llabs (res - t) > JITTER) { inited = false; prime (); res = initime_ns + timeGetTime_ns (); } return res; } extern "C" int clock_gettime (clockid_t clk_id, struct timespec *tp) { switch (clk_id) { case CLOCK_REALTIME: { LONGLONG now = gtod.nsecs (); if (now == (LONGLONG) -1) return -1; tp->tv_sec = now / NSPERSEC; tp->tv_nsec = (now % NSPERSEC) * (1000000000 / NSPERSEC); break; } case CLOCK_MONOTONIC: { LONGLONG now = ntod.nsecs (); if (now == (LONGLONG) -1) return -1; tp->tv_sec = now / 1000000000; tp->tv_nsec = (now % 1000000000); break; } default: set_errno (EINVAL); return -1; } return 0; } static DWORD minperiod; // FIXME: Maintain period after a fork. LONGLONG hires_ns::resolution () { if (!inited) prime (); if (inited < 0) { set_errno (ENOSYS); return (long long) -1; } return (LONGLONG) freq; } UINT hires_ms::resolution () { if (!minperiod) { NTSTATUS status; ULONG coarsest, finest, actual; status = NtQueryTimerResolution (&coarsest, &finest, &actual); if (NT_SUCCESS (status)) minperiod = (DWORD) actual / 10000L; else { /* Try to empirically determine current timer resolution */ int priority = GetThreadPriority (GetCurrentThread ()); SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_TIME_CRITICAL); LONGLONG period = 0; for (int i = 0; i < 4; i++) { LONGLONG now; LONGLONG then = timeGetTime_ns (); while ((now = timeGetTime_ns ()) == then) continue; then = now; while ((now = timeGetTime_ns ()) == then) continue; period += now - then; } SetThreadPriority (GetCurrentThread (), priority); period /= 40000L; minperiod = (DWORD) period; } /* The resolution can be as low as 5000 100ns intervals on recent OSes. We have to make sure that the resolution in ms is never 0. */ if (!minperiod) minperiod = 1L; } return minperiod; } extern "C" int clock_getres (clockid_t clk_id, struct timespec *tp) { switch (clk_id) { case CLOCK_REALTIME: { DWORD period = gtod.resolution (); tp->tv_sec = period / 1000; tp->tv_nsec = (period % 1000) * 1000000; break; } case CLOCK_MONOTONIC: { LONGLONG period = ntod.resolution (); tp->tv_sec = period / 1000000000; tp->tv_nsec = period % 1000000000; break; } default: set_errno (EINVAL); return -1; } return 0; } extern "C" int clock_setres (clockid_t clk_id, struct timespec *tp) { static NO_COPY bool period_set; int status; if (clk_id != CLOCK_REALTIME) { set_errno (EINVAL); return -1; } /* Convert to 100ns to match OS resolution. The OS uses ULONG values to express resolution in 100ns units, so the coarsest timer resolution is < 430 secs. Actually the coarsest timer resolution is only slightly beyond 15ms, but this might change in future OS versions, so we play nice here. */ ULONGLONG period = (tp->tv_sec * 10000000ULL) + ((tp->tv_nsec) / 100ULL); /* clock_setres is non-POSIX/non-Linux. On QNX, the function always rounds the incoming value to the nearest supported value. */ ULONG coarsest, finest, actual; if (NT_SUCCESS (NtQueryTimerResolution (&coarsest, &finest, &actual))) { if (period > coarsest) period = coarsest; else if (finest > period) period = finest; } if (period_set && NT_SUCCESS (NtSetTimerResolution (minperiod * 10000L, FALSE, &actual))) period_set = false; status = NtSetTimerResolution (period, TRUE, &actual); if (!NT_SUCCESS (status)) { __seterrno_from_nt_status (status); return -1; } minperiod = actual / 10000L; /* The resolution can be as low as 5000 100ns intervals on recent OSes. We have to make sure that the resolution in ms is never 0. */ if (!minperiod) minperiod = 1L; period_set = true; return 0; }