/usr/include/oce/gettime_osx.h is in liboce-foundation-dev 0.18.2-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | /*
* Copyright (c), MM Weiss
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the MM Weiss 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 LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* clock_gettime_stub.c
* gcc -Wall -c clock_gettime_stub.c
* posix realtime functions; MacOS user space glue
*/
/* @comment
* other possible implementation using intel builtin rdtsc
* rdtsc-workaround: http://www.mcs.anl.gov/~kazutomo/rdtsc.html
*
* we could get the ticks by doing this
*
* __asm __volatile("mov %%ebx, %%esi\n\t"
* "cpuid\n\t"
* "xchg %%esi, %%ebx\n\t"
* "rdtsc"
* : "=a" (a),
* "=d" (d)
* );
* we could even replace our tricky sched_yield call by assembly code to get a better accurency,
* anyway the following C stub will satisfy 99% of apps using posix clock_gettime call,
* moreover, the setter version (clock_settime) could be easly written using mach primitives:
* http://www.opensource.apple.com/source/xnu/xnu-${VERSION}/osfmk/man/ (clock_[set|get]_time)
*
* hackers don't be crackers, don't you use a flush toilet?
*
*
* @see draft: ./posix-realtime-stub/posix-realtime-stub.c
*
*/
extern "C" {
#ifndef _GETTIME_H
#define _GETTIME_H
#ifdef __APPLE__
#pragma weak clock_gettime
#include <sys/time.h>
#include <sys/resource.h>
#include <mach/mach.h>
#include <mach/clock.h>
#include <mach/mach_time.h>
#include <errno.h>
#include <unistd.h>
#include <sched.h>
typedef enum {
CLOCK_REALTIME,
CLOCK_MONOTONIC,
CLOCK_PROCESS_CPUTIME_ID,
CLOCK_THREAD_CPUTIME_ID
} clockid_t;
static mach_timebase_info_data_t __clock_gettime_inf;
int clock_gettime(clockid_t clk_id, struct timespec *tp) {
kern_return_t ret;
clock_serv_t clk;
clock_id_t clk_serv_id;
mach_timespec_t tm;
uint64_t start, end, delta, nano;
int retval = -1;
switch (clk_id) {
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
clk_serv_id = clk_id == CLOCK_REALTIME ? CALENDAR_CLOCK : SYSTEM_CLOCK;
if (KERN_SUCCESS == (ret = host_get_clock_service(mach_host_self(), clk_serv_id, &clk))) {
if (KERN_SUCCESS == (ret = clock_get_time(clk, &tm))) {
tp->tv_sec = tm.tv_sec;
tp->tv_nsec = tm.tv_nsec;
retval = 0;
}
}
if (KERN_SUCCESS != ret) {
errno = EINVAL;
retval = -1;
}
break;
case CLOCK_PROCESS_CPUTIME_ID:
case CLOCK_THREAD_CPUTIME_ID:
start = mach_absolute_time();
if (clk_id == CLOCK_PROCESS_CPUTIME_ID) {
getpid();
} else {
sched_yield();
}
end = mach_absolute_time();
delta = end - start;
if (0 == __clock_gettime_inf.denom) {
mach_timebase_info(&__clock_gettime_inf);
}
nano = delta * __clock_gettime_inf.numer / __clock_gettime_inf.denom;
tp->tv_sec = nano * 1e-9;
tp->tv_nsec = nano - (tp->tv_sec * 1e9);
retval = 0;
break;
default:
errno = EINVAL;
retval = -1;
}
return retval;
}
#endif // __APPLE__
#endif // _GETTIME_H
}
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