60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/**
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* @file phc.h
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* @note Copyright (C) 2011 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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#ifndef HAVE_PHC_H
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#define HAVE_PHC_H
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#include "missing.h"
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/**
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* Opens a PTP hardware clock device.
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*
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* @param phc The device to open.
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*
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* @return A valid clock ID on success, CLOCK_INVALID otherwise.
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*/
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clockid_t phc_open(char *phc);
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/**
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* Closes a PTP hardware clock device.
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*
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* @param clkid A clock ID obtained using phc_open().
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*/
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void phc_close(clockid_t clkid);
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/**
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* Query the maximum frequency adjustment of a PTP hardware clock device.
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*
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* @param clkid A clock ID obtained using phc_open().
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*
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* @return The clock's maximum frequency adjustment in parts per billion.
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*/
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int phc_max_adj(clockid_t clkid);
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/**
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* Checks whether the given PTP hardware clock device supports PPS output.
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*
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* @param clkid A clock ID obtained using phc_open().
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*
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* @return Zero if PPS output is not supported by the clock, non-zero
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* otherwise.
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*/
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int phc_has_pps(clockid_t clkid);
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#endif
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