/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/timeval.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/sysv/errfuns.h"
#include "libc/time/struct/timezone.h"
#include "libc/time/time.h"

/**
 * Returns system wall time in microseconds.
 *
 * @param tv points to timeval that receives result if non-NULL
 * @param tz receives UTC timezone if non-NULL
 * @see	clock_gettime() for nanosecond precision
 * @see	strftime() for string formatting
 */
int gettimeofday(struct timeval *tv, struct timezone *tz) {
  axdx_t ad;
  if (IsAsan() && ((tv && !__asan_is_valid(tv, sizeof(*tv))) ||
                   (tz && !__asan_is_valid(tz, sizeof(*tz))))) {
    return efault();
  }
  if (!IsWindows() && !IsMetal()) {
    ad = sys_gettimeofday(tv, tz, NULL);
    assert(ad.ax != -1);
    if (SupportsXnu() && ad.ax && tv) {
      tv->tv_sec = ad.ax;
      tv->tv_usec = ad.dx;
    }
    return 0;
  } else if (IsMetal()) {
    return enosys();
  } else {
    return sys_gettimeofday_nt(tv, tz);
  }
}