mirror of
https://github.com/jart/cosmopolitan.git
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81 lines
3.5 KiB
C
81 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/calls/struct/timeval.internal.h"
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#include "libc/errno.h"
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#include "libc/macros.internal.h"
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#include "libc/sysv/consts/clock.h"
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#ifdef __x86_64__
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#define CTL_KERN 1
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#define KERN_BOOTTIME 21
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int sys_clock_gettime_xnu(int clock, struct timespec *ts) {
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long ax, dx;
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if (clock == CLOCK_REALTIME) {
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// invoke the system call
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//
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// int gettimeofday(struct timeval *tp,
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// struct timezone *tzp,
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// uint64_t *mach_absolute_time);
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//
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// as follows
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//
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// ax, dx = gettimeofday(&ts, 0, 0);
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//
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// to support multiple calling conventions
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//
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// 1. new xnu returns *ts in memory via rdi
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// 2. old xnu returns *ts in rax:rdx regs
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//
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// we assume this system call always succeeds
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if (ts) {
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asm volatile("syscall"
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: "=a"(ax), "=d"(dx)
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: "0"(0x2000000 | 116), "D"(ts), "S"(0), "1"(0)
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: "rcx", "r8", "r9", "r10", "r11", "memory");
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if (ax) {
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ts->tv_sec = ax;
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ts->tv_nsec = dx;
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}
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ts->tv_nsec *= 1000;
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}
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return 0;
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} else if (clock == CLOCK_MONOTONIC) {
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if (!ts)
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return 0;
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return sys_clock_gettime_mono(ts);
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} else if (clock == CLOCK_BOOTTIME) {
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struct timeval x;
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size_t n = sizeof(x);
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int mib[] = {CTL_KERN, KERN_BOOTTIME};
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if (sysctl(mib, ARRAYLEN(mib), &x, &n, 0, 0) == -1)
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return -1;
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if (ts)
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*ts = timeval_totimespec(timeval_sub(timeval_real(), x));
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return 0;
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} else {
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return -EINVAL;
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}
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}
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#endif /* __x86_64__ */
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