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/*
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* Copyright (c) 2007 Sebastian Benoit <benoit-lists@fb12.de>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/timex.h>
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#include <unistd.h>
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#include <ntp.h>
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#include <ntpd.h>
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/*
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* adjfreq (old)freq = nanosec. per seconds shifted left 32 bits
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* timex.freq is ppm / left shifted by SHIFT_USEC (16 bits), defined in timex.h
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*/
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int
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adjfreq(const int64_t *freq, int64_t *oldfreq)
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{
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struct timex txc = { 0 };
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int64_t newfreq;
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if (freq != NULL) {
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txc.modes = ADJ_FREQUENCY;
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txc.freq = *freq / 1e3 / (1LL << 16);
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if ((adjtimex(&txc)) == -1)
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log_warn("adjtimex failed");
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log_debug("adjtimex adjusted frequency by %fppm",
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((txc.freq * 1e3) * (1LL<<16) / 1e3 / (1LL << 32)));
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}
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if (oldfreq != NULL) {
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txc.modes = 0;
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if ((adjtimex(&txc)) == -1) {
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log_warn("adjtimex failed");
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return -1;
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}
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newfreq = (txc.freq * 1e3) * (1LL<<16);
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log_debug("adjtimex returns frequency of %fppm",
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newfreq / 1e3 / (1LL << 32));
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*oldfreq = newfreq;
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}
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return 0;
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}
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