/*-*- 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/calls/internal.h"
#include "libc/nexgen32e/nexgen32e.h"
#include "libc/nt/enum/status.h"
#include "libc/nt/errors.h"
#include "libc/nt/nt/time.h"
#include "libc/nt/synchronization.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"

textwindows int nanosleep$nt(const struct timespec *req, struct timespec *rem) {
  int64_t millis, hectonanos, relasleep;
  if (rem) memcpy(rem, req, sizeof(*rem));
  hectonanos = req->tv_sec * 10000000ull + div100int64(req->tv_nsec);
  hectonanos = MAX(1, hectonanos);
  relasleep = -hectonanos;
  if (NtError(NtDelayExecution(true, &relasleep))) {
    millis = div10000int64(hectonanos);
    millis = MAX(1, millis);
    if (SleepEx(millis, true) == kNtWaitIoCompletion) {
      return eintr();
    }
  }
  if (rem) memset(rem, 0, sizeof(*rem));
  return 0;
}