42b305478d
If the delay is known, print it together with the offset and frequency. Remove the time stamp from the output to fit it into 80 chars. Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/**
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* @file sysoff.h
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* @brief Implements the system offset estimation method.
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* @note Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdint.h>
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enum {
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SYSOFF_SUPPORTED,
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SYSOFF_COMPILE_TIME_MISSING,
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SYSOFF_RUN_TIME_MISSING,
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};
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/**
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* Check to see if the PTP_SYS_OFFSET ioctl is supported.
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* @param fd An open file descriptor to a PHC device.
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* @return One of the SYSOFF_ enumeration values.
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*/
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int sysoff_probe(int fd, int n_samples);
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/**
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* Measure the offset between a PHC and the system time.
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* @param fd An open file descriptor to a PHC device.
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* @param n_samples The number of consecutive readings to make.
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* @param result The estimated offset in nanoseconds.
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* @param ts The system time corresponding to the 'result'.
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* @param delay The delay in reading of the clock in nanoseconds.
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* @return One of the SYSOFF_ enumeration values.
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*/
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int sysoff_measure(int fd, int n_samples,
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int64_t *result, uint64_t *ts, int64_t *delay);
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