4e177c2d64
the message being emitted immediately. Fix computation of reception time so it's more sensible (the block timestamp is some time after reception of the _end_ of the block, not the start) - this means that message-emission times are always later than message-reception times in SBS output, which is a bit more sensible. Use clock_gettime in preference to ftime.
87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
// Part of dump1090, a Mode S message decoder for RTLSDR devices.
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//
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// util.c: misc utilities
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//
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// Copyright (c) 2015 Oliver Jowett <oliver@mutability.co.uk>
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//
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// This file is free software: you may copy, redistribute and/or modify it
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// under the terms of the GNU General Public License as published by the
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// Free Software Foundation, either version 2 of the License, or (at your
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// option) any later version.
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//
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// This file is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// This file incorporates work covered by the following copyright and
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// permission notice:
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//
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// Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
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//
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// All rights reserved.
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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 are
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// met:
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//
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// * 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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//
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// * 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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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "util.h"
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#include <stdlib.h>
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#include <sys/time.h>
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uint64_t mstime(void)
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{
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struct timeval tv;
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uint64_t mst;
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gettimeofday(&tv, NULL);
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mst = ((uint64_t)tv.tv_sec)*1000;
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mst += tv.tv_usec/1000;
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return mst;
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}
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uint64_t receiveclock_ns_elapsed(uint64_t t1, uint64_t t2)
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{
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if (t2 < t1) {
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// wrapped.
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return (~(t1 - t2) + 1) * 1000U / 12U;
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} else {
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return (t2 - t1) * 1000U / 12U;
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}
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}
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void normalize_timespec(struct timespec *ts)
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{
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if (ts->tv_nsec > 1000000000) {
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ts->tv_sec += ts->tv_nsec / 1000000000;
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ts->tv_nsec = ts->tv_nsec % 1000000000;
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} else if (ts->tv_nsec < 0) {
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long adjust = ts->tv_nsec / 1000000000 + 1;
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ts->tv_sec -= adjust;
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ts->tv_nsec = (ts->tv_nsec + 1000000000 * adjust) % 1000000000;
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}
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}
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