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/*
* Copyright (c) 2002-2013 Balabit
* Copyright (c) 1998-2012 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "timeutils/misc.h"
#include "timeutils/cache.h"
#include "messages.h"
#include <string.h>
/**
* get_local_timezone_ofs:
* @when: time in UTC
*
* Return the zone offset (measured in seconds) of @when expressed in local
* time. The function also takes care about daylight saving.
**/
long
get_local_timezone_ofs(time_t when)
{
#ifdef SYSLOG_NG_HAVE_STRUCT_TM_TM_GMTOFF
struct tm ltm;
cached_localtime(&when, <m);
return ltm.tm_gmtoff;
#else
struct tm gtm;
struct tm ltm;
long tzoff;
cached_localtime(&when, <m);
cached_gmtime(&when, >m);
tzoff = (ltm.tm_hour - gtm.tm_hour) * 3600;
tzoff += (ltm.tm_min - gtm.tm_min) * 60;
tzoff += ltm.tm_sec - gtm.tm_sec;
if (tzoff > 0 && (ltm.tm_year < gtm.tm_year || ltm.tm_mon < gtm.tm_mon || ltm.tm_mday < gtm.tm_mday))
tzoff -= 86400;
else if (tzoff < 0 && (ltm.tm_year > gtm.tm_year || ltm.tm_mon > gtm.tm_mon || ltm.tm_mday > gtm.tm_mday))
tzoff += 86400;
return tzoff;
#endif /* SYSLOG_NG_HAVE_STRUCT_TM_TM_GMTOFF */
}
/**
* check_nanosleep:
*
* Check if nanosleep() is accurate enough for sub-millisecond sleeping. If
* it is not good enough, we're skipping the minor sleeps in LogReader to
* balance the cost of returning to the main loop (e.g. we're always going
* to return to the main loop, instead of trying to wait for the writer).
**/
gboolean
check_nanosleep(void)
{
struct timespec start, stop, sleep_amount;
glong diff;
gint attempts;
for (attempts = 0; attempts < 3; attempts++)
{
clock_gettime(CLOCK_MONOTONIC, &start);
sleep_amount.tv_sec = 0;
/* 0.1 msec */
sleep_amount.tv_nsec = 1e5;
while (nanosleep(&sleep_amount, &sleep_amount) < 0)
;
clock_gettime(CLOCK_MONOTONIC, &stop);
diff = timespec_diff_nsec(&stop, &start);
if (diff < 5e5)
return TRUE;
}
return FALSE;
}
/**
* g_time_val_diff:
* @t1: time value t1
* @t2: time value t2
*
* Calculates the time difference between t1 and t2 in microseconds.
* The result is positive if t1 is later than t2.
*
* Returns:
* Time difference in microseconds
*/
glong
g_time_val_diff(GTimeVal *t1, GTimeVal *t2)
{
g_assert(t1);
g_assert(t2);
return (t1->tv_sec - t2->tv_sec) * G_USEC_PER_SEC + (t1->tv_usec - t2->tv_usec);
}
void
timespec_add_msec(struct timespec *ts, glong msec)
{
ts->tv_sec += msec / 1000;
msec = msec % 1000;
ts->tv_nsec += (glong) (msec * 1e6);
if (ts->tv_nsec > 1e9)
{
ts->tv_nsec -= (glong) 1e9;
ts->tv_sec++;
}
}
glong
timespec_diff_msec(const struct timespec *t1, const struct timespec *t2)
{
return (t1->tv_sec - t2->tv_sec) * 1e3 + (t1->tv_nsec - t2->tv_nsec) / 1e6;
}
glong
timespec_diff_nsec(struct timespec *t1, struct timespec *t2)
{
return (glong)((t1->tv_sec - t2->tv_sec) * 1e9) + (t1->tv_nsec - t2->tv_nsec);
}
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