/*
 * The olsr.org Optimized Link-State Routing daemon (olsrd)
 *
 * (c) by the OLSR project
 *
 * See our Git repository to find out who worked on this file
 * and thus is a copyright holder on it.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 * * Neither the name of olsr.org, olsrd nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Visit http://www.olsr.org for more information.
 *
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 * to the project. For more information see the website or contact
 * the copyright holders.
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 */

#include "clock_gettime.h"

#include <err.h>
#include <mach/clock.h>
#include <mach/mach.h>
#include <sys/types.h>

int clock_gettime(clockid_t clock_id, struct timespec *tp) {
  /* The XNU docs prescribe `clock_t` and `tvalspec_t` for the
   * first two variables; we however use what the header file
   * in /usr/include/mach/clock.h tells us to (or else the
   * preprocessor complains). */
  clock_serv_t clock_name;
  mach_timespec_t current_clock_value;
  kern_return_t retval;

  /* Bail out on clock_id's that we don't emulate */
  if (clock_id != CLOCK_MONOTONIC)
    err(1, "Unsupported clock_id for mach_clock_gettime emulation");

  /* XXX This could use some more error checking... */
  host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &clock_name);
  retval = clock_get_time(clock_name, &current_clock_value);
  mach_port_deallocate(mach_task_self(), clock_name);
  tp->tv_sec = current_clock_value.tv_sec;
  tp->tv_nsec = current_clock_value.tv_nsec;

  return retval;
}
