Portable build framework for OpenNTPD
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/*
* Copyright (c) 2007 Sebastian Benoit <benoit-lists@fb12.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
# include <sys/timex.h>
#include <unistd.h>
#include <ntp.h>
#include <ntpd.h>
/*
* adjfreq (old)freq = nanosec. per seconds shifted left 32 bits
* timex.freq is ppm / left shifted by SHIFT_USEC (16 bits), defined in timex.h
*/
int
adjfreq(const int64_t *freq, int64_t *oldfreq)
{
struct timex txc = { 0 };
int64_t newfreq;
if (freq != NULL) {
txc.modes = MOD_FREQUENCY;
txc.freq = *freq / 1e3 / (1LL << 16);
if ((ntp_adjtime(&txc)) == -1)
log_warn("ntp_adjtime (2) failed");
log_debug("ntp_adjtime adjusted frequency by %fppm",
((txc.freq * 1e3) * (1LL<<16) / 1e3 / (1LL << 32)));
}
if (oldfreq != NULL) {
txc.modes = 0;
if ((ntp_adjtime(&txc)) == -1) {
log_warn("ntp_adjtime (1) failed");
return -1;
}
newfreq = (txc.freq * 1e3) * (1LL<<16);
log_debug("ntp_adjtime returns frequency of %fppm",
newfreq / 1e3 / (1LL << 32));
*oldfreq = newfreq;
}
return 0;
}