580 lines
17 KiB
C
580 lines
17 KiB
C
/*
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* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "event2/event-config.h"
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#include "evconfig-private.h"
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#ifdef _WIN32
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#include <winsock2.h>
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#undef WIN32_LEAN_AND_MEAN
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#endif
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#include <sys/types.h>
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#ifdef EVENT__HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <errno.h>
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#include <limits.h>
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#ifndef EVENT__HAVE_GETTIMEOFDAY
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#include <sys/timeb.h>
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#endif
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#if !defined(EVENT__HAVE_NANOSLEEP) && !defined(EVENT__HAVE_USLEEP) && \
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!defined(_WIN32)
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#include <sys/select.h>
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#endif
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#include <time.h>
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#include <sys/stat.h>
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#include <string.h>
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/** evutil_usleep_() */
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#if defined(_WIN32)
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#elif defined(EVENT__HAVE_NANOSLEEP)
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#elif defined(EVENT__HAVE_USLEEP)
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#include <unistd.h>
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#endif
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#include "event2/util.h"
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#include "util-internal.h"
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#include "log-internal.h"
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#include "mm-internal.h"
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#ifndef EVENT__HAVE_GETTIMEOFDAY
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/* No gettimeofday; this must be windows. */
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int
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evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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#ifdef _MSC_VER
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#define U64_LITERAL(n) n##ui64
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#else
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#define U64_LITERAL(n) n##llu
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#endif
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/* Conversion logic taken from Tor, which in turn took it
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* from Perl. GetSystemTimeAsFileTime returns its value as
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* an unaligned (!) 64-bit value containing the number of
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* 100-nanosecond intervals since 1 January 1601 UTC. */
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#define EPOCH_BIAS U64_LITERAL(116444736000000000)
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#define UNITS_PER_SEC U64_LITERAL(10000000)
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#define USEC_PER_SEC U64_LITERAL(1000000)
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#define UNITS_PER_USEC U64_LITERAL(10)
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union {
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FILETIME ft_ft;
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ev_uint64_t ft_64;
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} ft;
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if (tv == NULL)
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return -1;
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GetSystemTimeAsFileTime(&ft.ft_ft);
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if (EVUTIL_UNLIKELY(ft.ft_64 < EPOCH_BIAS)) {
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/* Time before the unix epoch. */
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return -1;
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}
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ft.ft_64 -= EPOCH_BIAS;
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tv->tv_sec = (long) (ft.ft_64 / UNITS_PER_SEC);
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tv->tv_usec = (long) ((ft.ft_64 / UNITS_PER_USEC) % USEC_PER_SEC);
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return 0;
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}
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#endif
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#define MAX_SECONDS_IN_MSEC_LONG \
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(((LONG_MAX) - 999) / 1000)
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long
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evutil_tv_to_msec_(const struct timeval *tv)
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{
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if (tv->tv_usec > 1000000 || tv->tv_sec > MAX_SECONDS_IN_MSEC_LONG)
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return -1;
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return (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000);
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}
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/*
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Replacement for usleep on platforms that don't have one. Not guaranteed to
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be any more finegrained than 1 msec.
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*/
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void
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evutil_usleep_(const struct timeval *tv)
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{
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if (!tv)
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return;
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#if defined(_WIN32)
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{
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long msec = evutil_tv_to_msec_(tv);
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Sleep((DWORD)msec);
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}
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#elif defined(EVENT__HAVE_NANOSLEEP)
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{
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struct timespec ts;
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ts.tv_sec = tv->tv_sec;
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ts.tv_nsec = tv->tv_usec*1000;
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nanosleep(&ts, NULL);
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}
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#elif defined(EVENT__HAVE_USLEEP)
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/* Some systems don't like to usleep more than 999999 usec */
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sleep(tv->tv_sec);
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usleep(tv->tv_usec);
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#else
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{
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struct timeval tv2 = *tv;
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select(0, NULL, NULL, NULL, &tv2);
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}
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#endif
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}
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int
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evutil_date_rfc1123(char *date, const size_t datelen, const struct tm *tm)
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{
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static const char *DAYS[] =
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{ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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static const char *MONTHS[] =
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{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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time_t t = time(NULL);
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#ifndef _WIN32
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struct tm sys;
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#endif
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/* If `tm` is null, set system's current time. */
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if (tm == NULL) {
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#ifdef _WIN32
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/** TODO: detect _gmtime64()/_gmtime64_s() */
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tm = gmtime(&t);
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#else
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gmtime_r(&t, &sys);
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tm = &sys;
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#endif
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}
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return evutil_snprintf(
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date, datelen, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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DAYS[tm->tm_wday], tm->tm_mday, MONTHS[tm->tm_mon],
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1900 + tm->tm_year, tm->tm_hour, tm->tm_min, tm->tm_sec);
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}
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/*
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This function assumes it's called repeatedly with a
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not-actually-so-monotonic time source whose outputs are in 'tv'. It
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implements a trivial ratcheting mechanism so that the values never go
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backwards.
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*/
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static void
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adjust_monotonic_time(struct evutil_monotonic_timer *base,
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struct timeval *tv)
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{
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evutil_timeradd(tv, &base->adjust_monotonic_clock, tv);
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if (evutil_timercmp(tv, &base->last_time, <)) {
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/* Guess it wasn't monotonic after all. */
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struct timeval adjust;
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evutil_timersub(&base->last_time, tv, &adjust);
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evutil_timeradd(&adjust, &base->adjust_monotonic_clock,
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&base->adjust_monotonic_clock);
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*tv = base->last_time;
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}
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base->last_time = *tv;
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}
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/*
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Allocate a new struct evutil_monotonic_timer
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*/
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struct evutil_monotonic_timer *
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evutil_monotonic_timer_new(void)
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{
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struct evutil_monotonic_timer *p = NULL;
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p = mm_malloc(sizeof(*p));
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if (!p) goto done;
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memset(p, 0, sizeof(*p));
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done:
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return p;
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}
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/*
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Free a struct evutil_monotonic_timer
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*/
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void
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evutil_monotonic_timer_free(struct evutil_monotonic_timer *timer)
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{
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if (timer) {
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mm_free(timer);
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}
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}
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/*
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Set up a struct evutil_monotonic_timer for initial use
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*/
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int
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evutil_configure_monotonic_time(struct evutil_monotonic_timer *timer,
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int flags)
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{
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return evutil_configure_monotonic_time_(timer, flags);
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}
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/*
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Query the current monotonic time
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*/
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int
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evutil_gettime_monotonic(struct evutil_monotonic_timer *timer,
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struct timeval *tp)
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{
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return evutil_gettime_monotonic_(timer, tp);
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}
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#if defined(HAVE_POSIX_MONOTONIC)
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/* =====
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The POSIX clock_gettime() interface provides a few ways to get at a
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monotonic clock. CLOCK_MONOTONIC is most widely supported. Linux also
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provides a CLOCK_MONOTONIC_COARSE with accuracy of about 1-4 msec.
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On all platforms I'm aware of, CLOCK_MONOTONIC really is monotonic.
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Platforms don't agree about whether it should jump on a sleep/resume.
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*/
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int
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evutil_configure_monotonic_time_(struct evutil_monotonic_timer *base,
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int flags)
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{
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/* CLOCK_MONOTONIC exists on FreeBSD, Linux, and Solaris. You need to
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* check for it at runtime, because some older kernel versions won't
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* have it working. */
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#ifdef CLOCK_MONOTONIC_COARSE
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const int precise = flags & EV_MONOT_PRECISE;
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#endif
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const int fallback = flags & EV_MONOT_FALLBACK;
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struct timespec ts;
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#ifdef CLOCK_MONOTONIC_COARSE
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if (CLOCK_MONOTONIC_COARSE < 0) {
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/* Technically speaking, nothing keeps CLOCK_* from being
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* negative (as far as I know). This check and the one below
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* make sure that it's safe for us to use -1 as an "unset"
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* value. */
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event_errx(1,"I didn't expect CLOCK_MONOTONIC_COARSE to be < 0");
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}
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if (! precise && ! fallback) {
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if (clock_gettime(CLOCK_MONOTONIC_COARSE, &ts) == 0) {
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base->monotonic_clock = CLOCK_MONOTONIC_COARSE;
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return 0;
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}
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}
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#endif
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if (!fallback && clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
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base->monotonic_clock = CLOCK_MONOTONIC;
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return 0;
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}
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if (CLOCK_MONOTONIC < 0) {
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event_errx(1,"I didn't expect CLOCK_MONOTONIC to be < 0");
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}
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base->monotonic_clock = -1;
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return 0;
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}
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int
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evutil_gettime_monotonic_(struct evutil_monotonic_timer *base,
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struct timeval *tp)
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{
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struct timespec ts;
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if (base->monotonic_clock < 0) {
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if (evutil_gettimeofday(tp, NULL) < 0)
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return -1;
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adjust_monotonic_time(base, tp);
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return 0;
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}
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if (clock_gettime(base->monotonic_clock, &ts) == -1)
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return -1;
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tp->tv_sec = ts.tv_sec;
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tp->tv_usec = ts.tv_nsec / 1000;
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return 0;
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}
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#endif
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#if defined(HAVE_MACH_MONOTONIC)
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/* ======
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Apple is a little late to the POSIX party. And why not? Instead of
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clock_gettime(), they provide mach_absolute_time(). Its units are not
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fixed; we need to use mach_timebase_info() to get the right functions to
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convert its units into nanoseconds.
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To all appearances, mach_absolute_time() seems to be honest-to-goodness
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monotonic. Whether it stops during sleep or not is unspecified in
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principle, and dependent on CPU architecture in practice.
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*/
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int
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evutil_configure_monotonic_time_(struct evutil_monotonic_timer *base,
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int flags)
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{
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const int fallback = flags & EV_MONOT_FALLBACK;
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struct mach_timebase_info mi;
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memset(base, 0, sizeof(*base));
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/* OSX has mach_absolute_time() */
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if (!fallback &&
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mach_timebase_info(&mi) == 0 &&
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mach_absolute_time() != 0) {
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/* mach_timebase_info tells us how to convert
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* mach_absolute_time() into nanoseconds, but we
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* want to use microseconds instead. */
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mi.denom *= 1000;
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memcpy(&base->mach_timebase_units, &mi, sizeof(mi));
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} else {
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base->mach_timebase_units.numer = 0;
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}
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return 0;
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}
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int
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evutil_gettime_monotonic_(struct evutil_monotonic_timer *base,
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struct timeval *tp)
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{
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ev_uint64_t abstime, usec;
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if (base->mach_timebase_units.numer == 0) {
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if (evutil_gettimeofday(tp, NULL) < 0)
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return -1;
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adjust_monotonic_time(base, tp);
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return 0;
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}
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abstime = mach_absolute_time();
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usec = (abstime * base->mach_timebase_units.numer)
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/ (base->mach_timebase_units.denom);
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tp->tv_sec = usec / 1000000;
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tp->tv_usec = usec % 1000000;
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return 0;
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}
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#endif
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#if defined(HAVE_WIN32_MONOTONIC)
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/* =====
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Turn we now to Windows. Want monontonic time on Windows?
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Windows has QueryPerformanceCounter(), which gives time most high-
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resolution time. It's a pity it's not so monotonic in practice; it's
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also got some fun bugs, especially: with older Windowses, under
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virtualizations, with funny hardware, on multiprocessor systems, and so
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on. PEP418 [1] has a nice roundup of the issues here.
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There's GetTickCount64() on Vista and later, which gives a number of 1-msec
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ticks since startup. The accuracy here might be as bad as 10-20 msec, I
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hear. There's an undocumented function (NtSetTimerResolution) that
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allegedly increases the accuracy. Good luck!
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There's also GetTickCount(), which is only 32 bits, but seems to be
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supported on pre-Vista versions of Windows. Apparently, you can coax
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another 14 bits out of it, giving you 2231 years before rollover.
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The less said about timeGetTime() the better.
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"We don't care. We don't have to. We're the Phone Company."
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-- Lily Tomlin, SNL
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Our strategy, if precise timers are turned off, is to just use the best
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GetTickCount equivalent available. If we've been asked for precise timing,
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then we mostly[2] assume that GetTickCount is monotonic, and correct
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GetPerformanceCounter to approximate it.
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[1] http://www.python.org/dev/peps/pep-0418
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[2] Of course, we feed the Windows stuff into adjust_monotonic_time()
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anyway, just in case it isn't.
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*/
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/*
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Parts of our logic in the win32 timer code here are closely based on
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BitTorrent's libUTP library. That code is subject to the following
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license:
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Copyright (c) 2010 BitTorrent, Inc.
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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static ev_uint64_t
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evutil_GetTickCount_(struct evutil_monotonic_timer *base)
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{
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if (base->GetTickCount64_fn) {
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/* Let's just use GetTickCount64 if we can. */
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return base->GetTickCount64_fn();
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} else if (base->GetTickCount_fn) {
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/* Greg Hazel assures me that this works, that BitTorrent has
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* done it for years, and this it won't turn around and
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* bite us. He says they found it on some game programmers'
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* forum some time around 2007.
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*/
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ev_uint64_t v = base->GetTickCount_fn();
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return (DWORD)v | ((v >> 18) & 0xFFFFFFFF00000000);
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} else {
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/* Here's the fallback implementation. We have to use
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* GetTickCount() with its given signature, so we only get
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* 32 bits worth of milliseconds, which will roll ove every
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* 49 days or so. */
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DWORD ticks = GetTickCount();
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if (ticks < base->last_tick_count) {
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base->adjust_tick_count += ((ev_uint64_t)1) << 32;
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}
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base->last_tick_count = ticks;
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return ticks + base->adjust_tick_count;
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}
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}
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int
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evutil_configure_monotonic_time_(struct evutil_monotonic_timer *base,
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int flags)
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{
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const int precise = flags & EV_MONOT_PRECISE;
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const int fallback = flags & EV_MONOT_FALLBACK;
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HANDLE h;
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memset(base, 0, sizeof(*base));
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h = evutil_load_windows_system_library_(TEXT("kernel32.dll"));
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if (h != NULL && !fallback) {
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base->GetTickCount64_fn = (ev_GetTickCount_func)GetProcAddress(h, "GetTickCount64");
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base->GetTickCount_fn = (ev_GetTickCount_func)GetProcAddress(h, "GetTickCount");
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}
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base->first_tick = base->last_tick_count = evutil_GetTickCount_(base);
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if (precise && !fallback) {
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LARGE_INTEGER freq;
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if (QueryPerformanceFrequency(&freq)) {
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LARGE_INTEGER counter;
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QueryPerformanceCounter(&counter);
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base->first_counter = counter.QuadPart;
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base->usec_per_count = 1.0e6 / freq.QuadPart;
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base->use_performance_counter = 1;
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}
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|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline ev_int64_t
|
|
abs64(ev_int64_t i)
|
|
{
|
|
return i < 0 ? -i : i;
|
|
}
|
|
|
|
|
|
int
|
|
evutil_gettime_monotonic_(struct evutil_monotonic_timer *base,
|
|
struct timeval *tp)
|
|
{
|
|
ev_uint64_t ticks = evutil_GetTickCount_(base);
|
|
if (base->use_performance_counter) {
|
|
/* Here's a trick we took from BitTorrent's libutp, at Greg
|
|
* Hazel's recommendation. We use QueryPerformanceCounter for
|
|
* our high-resolution timer, but use GetTickCount*() to keep
|
|
* it sane, and adjust_monotonic_time() to keep it monotonic.
|
|
*/
|
|
LARGE_INTEGER counter;
|
|
ev_int64_t counter_elapsed, counter_usec_elapsed, ticks_elapsed;
|
|
QueryPerformanceCounter(&counter);
|
|
counter_elapsed = (ev_int64_t)
|
|
(counter.QuadPart - base->first_counter);
|
|
ticks_elapsed = ticks - base->first_tick;
|
|
/* TODO: This may upset VC6. If you need this to work with
|
|
* VC6, please supply an appropriate patch. */
|
|
counter_usec_elapsed = (ev_int64_t)
|
|
(counter_elapsed * base->usec_per_count);
|
|
|
|
if (abs64(ticks_elapsed*1000 - counter_usec_elapsed) > 1000000) {
|
|
/* It appears that the QueryPerformanceCounter()
|
|
* result is more than 1 second away from
|
|
* GetTickCount() result. Let's adjust it to be as
|
|
* accurate as we can; adjust_monotnonic_time() below
|
|
* will keep it monotonic. */
|
|
counter_usec_elapsed = ticks_elapsed * 1000;
|
|
base->first_counter = (ev_uint64_t) (counter.QuadPart - counter_usec_elapsed / base->usec_per_count);
|
|
}
|
|
tp->tv_sec = (time_t) (counter_usec_elapsed / 1000000);
|
|
tp->tv_usec = counter_usec_elapsed % 1000000;
|
|
|
|
} else {
|
|
/* We're just using GetTickCount(). */
|
|
tp->tv_sec = (time_t) (ticks / 1000);
|
|
tp->tv_usec = (ticks % 1000) * 1000;
|
|
}
|
|
adjust_monotonic_time(base, tp);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if defined(HAVE_FALLBACK_MONOTONIC)
|
|
/* =====
|
|
And if none of the other options work, let's just use gettimeofday(), and
|
|
ratchet it forward so that it acts like a monotonic timer, whether it
|
|
wants to or not.
|
|
*/
|
|
|
|
int
|
|
evutil_configure_monotonic_time_(struct evutil_monotonic_timer *base,
|
|
int precise)
|
|
{
|
|
memset(base, 0, sizeof(*base));
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
evutil_gettime_monotonic_(struct evutil_monotonic_timer *base,
|
|
struct timeval *tp)
|
|
{
|
|
if (evutil_gettimeofday(tp, NULL) < 0)
|
|
return -1;
|
|
adjust_monotonic_time(base, tp);
|
|
return 0;
|
|
|
|
}
|
|
#endif
|