--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/src/win/util.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,1750 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <direct.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <wchar.h>
+
+#include "uv.h"
+#include "internal.h"
+
+/* clang-format off */
+#include <sysinfoapi.h>
+#include <winsock2.h>
+#include <winperf.h>
+#include <iphlpapi.h>
+#include <psapi.h>
+#include <tlhelp32.h>
+#include <windows.h>
+/* clang-format on */
+#include <userenv.h>
+#include <math.h>
+
+/*
+ * Max title length; the only thing MSDN tells us about the maximum length
+ * of the console title is that it is smaller than 64K. However in practice
+ * it is much smaller, and there is no way to figure out what the exact length
+ * of the title is or can be, at least not on XP. To make it even more
+ * annoying, GetConsoleTitle fails when the buffer to be read into is bigger
+ * than the actual maximum length. So we make a conservative guess here;
+ * just don't put the novel you're writing in the title, unless the plot
+ * survives truncation.
+ */
+#define MAX_TITLE_LENGTH 8192
+
+/* The number of nanoseconds in one second. */
+#define UV__NANOSEC 1000000000
+
+/* Max user name length, from iphlpapi.h */
+#ifndef UNLEN
+# define UNLEN 256
+#endif
+
+
+/* A RtlGenRandom() by any other name... */
+extern BOOLEAN NTAPI SystemFunction036(PVOID Buffer, ULONG BufferLength);
+
+/* Cached copy of the process title, plus a mutex guarding it. */
+static char *process_title;
+static CRITICAL_SECTION process_title_lock;
+
+/* Frequency of the high-resolution clock. */
+static uint64_t hrtime_frequency_ = 0;
+
+
+/*
+ * One-time initialization code for functionality defined in util.c.
+ */
+void uv__util_init(void) {
+  LARGE_INTEGER perf_frequency;
+
+  /* Initialize process title access mutex. */
+  InitializeCriticalSection(&process_title_lock);
+
+  /* Retrieve high-resolution timer frequency
+   * and precompute its reciprocal.
+   */
+  if (QueryPerformanceFrequency(&perf_frequency)) {
+    hrtime_frequency_ = perf_frequency.QuadPart;
+  } else {
+    uv_fatal_error(GetLastError(), "QueryPerformanceFrequency");
+  }
+}
+
+
+int uv_exepath(char* buffer, size_t* size_ptr) {
+  size_t utf8_len, utf16_buffer_len, utf16_len;
+  WCHAR* utf16_buffer;
+  int err;
+
+  if (buffer == NULL || size_ptr == NULL || *size_ptr == 0) {
+    return UV_EINVAL;
+  }
+
+  if (*size_ptr > 32768) {
+    /* Windows paths can never be longer than this. */
+    utf16_buffer_len = 32768;
+  } else {
+    utf16_buffer_len = (int) *size_ptr;
+  }
+
+  utf16_buffer = (WCHAR*) uv__malloc(sizeof(WCHAR) * utf16_buffer_len);
+  if (!utf16_buffer) {
+    return UV_ENOMEM;
+  }
+
+  /* Get the path as UTF-16. */
+  utf16_len = GetModuleFileNameW(NULL, utf16_buffer, utf16_buffer_len);
+  if (utf16_len <= 0) {
+    err = GetLastError();
+    goto error;
+  }
+
+  /* Convert to UTF-8 */
+  utf8_len = *size_ptr - 1; /* Reserve space for NUL */
+  err = uv_utf16_to_wtf8(utf16_buffer, utf16_len, &buffer, &utf8_len);
+  if (err == UV_ENOBUFS) {
+    utf8_len = *size_ptr - 1;
+    err = 0;
+  }
+  *size_ptr = utf8_len;
+
+  uv__free(utf16_buffer);
+
+  return err;
+
+ error:
+  uv__free(utf16_buffer);
+  return uv_translate_sys_error(err);
+}
+
+
+static int uv__cwd(WCHAR** buf, DWORD *len) {
+  WCHAR* p;
+  DWORD n;
+  DWORD t;
+
+  t = GetCurrentDirectoryW(0, NULL);
+  for (;;) {
+    if (t == 0)
+      return uv_translate_sys_error(GetLastError());
+
+    /* |t| is the size of the buffer _including_ nul. */
+    p = uv__malloc(t * sizeof(*p));
+    if (p == NULL)
+      return UV_ENOMEM;
+
+    /* |n| is the size of the buffer _excluding_ nul but _only on success_.
+     * If |t| was too small because another thread changed the working
+     * directory, |n| is the size the buffer should be _including_ nul.
+     * It therefore follows we must resize when n >= t and fail when n == 0.
+     */
+    n = GetCurrentDirectoryW(t, p);
+    if (n > 0)
+      if (n < t)
+        break;
+
+    uv__free(p);
+    t = n;
+  }
+
+  /* The returned directory should not have a trailing slash, unless it points
+   * at a drive root, like c:\. Remove it if needed.
+   */
+  t = n - 1;
+  if (p[t] == L'\\' && !(n == 3 && p[1] == L':')) {
+    p[t] = L'\0';
+    n = t;
+  }
+
+  *buf = p;
+  *len = n;
+
+  return 0;
+}
+
+
+int uv_cwd(char* buffer, size_t* size) {
+  DWORD utf16_len;
+  WCHAR *utf16_buffer;
+  int r;
+
+  if (buffer == NULL || size == NULL || *size == 0) {
+    return UV_EINVAL;
+  }
+
+  r = uv__cwd(&utf16_buffer, &utf16_len);
+  if (r < 0)
+    return r;
+
+  r = uv__copy_utf16_to_utf8(utf16_buffer, utf16_len, buffer, size);
+
+  uv__free(utf16_buffer);
+
+  return r;
+}
+
+
+int uv_chdir(const char* dir) {
+  WCHAR *utf16_buffer;
+  DWORD utf16_len;
+  WCHAR drive_letter, env_var[4];
+  int r;
+
+  /* Convert to UTF-16 */
+  r = uv__convert_utf8_to_utf16(dir, &utf16_buffer);
+  if (r)
+    return r;
+
+  if (!SetCurrentDirectoryW(utf16_buffer)) {
+    uv__free(utf16_buffer);
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  /* uv__cwd() will return a new buffer. */
+  uv__free(utf16_buffer);
+  utf16_buffer = NULL;
+
+  /* Windows stores the drive-local path in an "hidden" environment variable,
+   * which has the form "=C:=C:\Windows". SetCurrentDirectory does not update
+   * this, so we'll have to do it. */
+  r = uv__cwd(&utf16_buffer, &utf16_len);
+  if (r == UV_ENOMEM) {
+    /* When updating the environment variable fails, return UV_OK anyway.
+     * We did successfully change current working directory, only updating
+     * hidden env variable failed. */
+    return 0;
+  }
+  if (r < 0) {
+    return r;
+  }
+
+  if (utf16_len < 2 || utf16_buffer[1] != L':') {
+    /* Doesn't look like a drive letter could be there - probably an UNC path.
+     * TODO: Need to handle win32 namespaces like \\?\C:\ ? */
+    drive_letter = 0;
+  } else if (utf16_buffer[0] >= L'A' && utf16_buffer[0] <= L'Z') {
+    drive_letter = utf16_buffer[0];
+  } else if (utf16_buffer[0] >= L'a' && utf16_buffer[0] <= L'z') {
+    /* Convert to uppercase. */
+    drive_letter = utf16_buffer[0] - L'a' + L'A';
+  } else {
+    /* Not valid. */
+    drive_letter = 0;
+  }
+
+  if (drive_letter != 0) {
+    /* Construct the environment variable name and set it. */
+    env_var[0] = L'=';
+    env_var[1] = drive_letter;
+    env_var[2] = L':';
+    env_var[3] = L'\0';
+
+    SetEnvironmentVariableW(env_var, utf16_buffer);
+  }
+
+  uv__free(utf16_buffer);
+  return 0;
+}
+
+
+void uv_loadavg(double avg[3]) {
+  /* Can't be implemented */
+  avg[0] = avg[1] = avg[2] = 0;
+}
+
+
+uint64_t uv_get_free_memory(void) {
+  MEMORYSTATUSEX memory_status;
+  memory_status.dwLength = sizeof(memory_status);
+
+  if (!GlobalMemoryStatusEx(&memory_status)) {
+     return 0;
+  }
+
+  return (uint64_t)memory_status.ullAvailPhys;
+}
+
+
+uint64_t uv_get_total_memory(void) {
+  MEMORYSTATUSEX memory_status;
+  memory_status.dwLength = sizeof(memory_status);
+
+  if (!GlobalMemoryStatusEx(&memory_status)) {
+    return 0;
+  }
+
+  return (uint64_t)memory_status.ullTotalPhys;
+}
+
+
+uint64_t uv_get_constrained_memory(void) {
+  return 0;  /* Memory constraints are unknown. */
+}
+
+
+uint64_t uv_get_available_memory(void) {
+  return uv_get_free_memory();
+}
+
+
+uv_pid_t uv_os_getpid(void) {
+  return GetCurrentProcessId();
+}
+
+
+uv_pid_t uv_os_getppid(void) {
+  NTSTATUS nt_status;
+  PROCESS_BASIC_INFORMATION basic_info;
+
+  nt_status = pNtQueryInformationProcess(GetCurrentProcess(),
+    ProcessBasicInformation,
+    &basic_info,
+    sizeof(basic_info),
+    NULL);
+  if (NT_SUCCESS(nt_status)) {
+    return basic_info.InheritedFromUniqueProcessId;
+  } else {
+    return -1;
+  }
+}
+
+
+char** uv_setup_args(int argc, char** argv) {
+  return argv;
+}
+
+
+void uv__process_title_cleanup(void) {
+}
+
+
+int uv_set_process_title(const char* title) {
+  int err;
+  int length;
+  WCHAR* title_w = NULL;
+
+  uv__once_init();
+
+  err = uv__convert_utf8_to_utf16(title, &title_w);
+  if (err)
+    return err;
+
+  /* If the title must be truncated insert a \0 terminator there */
+  length = wcslen(title_w);
+  if (length >= MAX_TITLE_LENGTH)
+    title_w[MAX_TITLE_LENGTH - 1] = L'\0';
+
+  if (!SetConsoleTitleW(title_w)) {
+    err = GetLastError();
+    goto done;
+  }
+
+  EnterCriticalSection(&process_title_lock);
+  uv__free(process_title);
+  process_title = uv__strdup(title);
+  LeaveCriticalSection(&process_title_lock);
+
+  err = 0;
+
+done:
+  uv__free(title_w);
+  return uv_translate_sys_error(err);
+}
+
+
+static int uv__get_process_title(void) {
+  WCHAR title_w[MAX_TITLE_LENGTH];
+  DWORD wlen;
+
+  wlen = GetConsoleTitleW(title_w, sizeof(title_w) / sizeof(WCHAR));
+  if (wlen == 0)
+    return uv_translate_sys_error(GetLastError());
+
+  return uv__convert_utf16_to_utf8(title_w, wlen, &process_title);
+}
+
+
+int uv_get_process_title(char* buffer, size_t size) {
+  size_t len;
+  int r;
+
+  if (buffer == NULL || size == 0)
+    return UV_EINVAL;
+
+  uv__once_init();
+
+  EnterCriticalSection(&process_title_lock);
+  /*
+   * If the process_title was never read before nor explicitly set,
+   * we must query it with getConsoleTitleW
+   */
+  if (process_title == NULL) {
+    r = uv__get_process_title();
+    if (r) {
+      LeaveCriticalSection(&process_title_lock);
+      return r;
+    }
+  }
+
+  assert(process_title);
+  len = strlen(process_title) + 1;
+
+  if (size < len) {
+    LeaveCriticalSection(&process_title_lock);
+    return UV_ENOBUFS;
+  }
+
+  memcpy(buffer, process_title, len);
+  LeaveCriticalSection(&process_title_lock);
+
+  return 0;
+}
+
+
+/* https://github.com/libuv/libuv/issues/1674 */
+int uv_clock_gettime(uv_clock_id clock_id, uv_timespec64_t* ts) {
+  FILETIME ft;
+  int64_t t;
+
+  if (ts == NULL)
+    return UV_EFAULT;
+
+  switch (clock_id) {
+    case UV_CLOCK_MONOTONIC:
+      uv__once_init();
+      t = uv__hrtime(UV__NANOSEC);
+      ts->tv_sec = t / 1000000000;
+      ts->tv_nsec = t % 1000000000;
+      return 0;
+    case UV_CLOCK_REALTIME:
+      GetSystemTimePreciseAsFileTime(&ft);
+      /* In 100-nanosecond increments from 1601-01-01 UTC because why not? */
+      t = (int64_t) ft.dwHighDateTime << 32 | ft.dwLowDateTime;
+      /* Convert to UNIX epoch, 1970-01-01. Still in 100 ns increments. */
+      t -= 116444736000000000ll;
+      /* Now convert to seconds and nanoseconds. */
+      ts->tv_sec = t / 10000000;
+      ts->tv_nsec = t % 10000000 * 100;
+      return 0;
+  }
+
+  return UV_EINVAL;
+}
+
+
+uint64_t uv_hrtime(void) {
+  uv__once_init();
+  return uv__hrtime(UV__NANOSEC);
+}
+
+
+uint64_t uv__hrtime(unsigned int scale) {
+  LARGE_INTEGER counter;
+  double scaled_freq;
+  double result;
+
+  assert(hrtime_frequency_ != 0);
+  assert(scale != 0);
+  if (!QueryPerformanceCounter(&counter)) {
+    uv_fatal_error(GetLastError(), "QueryPerformanceCounter");
+  }
+  assert(counter.QuadPart != 0);
+
+  /* Because we have no guarantee about the order of magnitude of the
+   * performance counter interval, integer math could cause this computation
+   * to overflow. Therefore we resort to floating point math.
+   */
+  scaled_freq = (double) hrtime_frequency_ / scale;
+  result = (double) counter.QuadPart / scaled_freq;
+  return (uint64_t) result;
+}
+
+
+int uv_resident_set_memory(size_t* rss) {
+  HANDLE current_process;
+  PROCESS_MEMORY_COUNTERS pmc;
+
+  current_process = GetCurrentProcess();
+
+  if (!GetProcessMemoryInfo(current_process, &pmc, sizeof(pmc))) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  *rss = pmc.WorkingSetSize;
+
+  return 0;
+}
+
+
+int uv_uptime(double* uptime) {
+  *uptime = GetTickCount64() / 1000.0;
+  return 0;
+}
+
+
+unsigned int uv_available_parallelism(void) {
+  DWORD_PTR procmask;
+  DWORD_PTR sysmask;
+  int count;
+  int i;
+
+  /* TODO(bnoordhuis) Use GetLogicalProcessorInformationEx() to support systems
+   * with > 64 CPUs? See https://github.com/libuv/libuv/pull/3458
+   */
+  count = 0;
+  if (GetProcessAffinityMask(GetCurrentProcess(), &procmask, &sysmask))
+    for (i = 0; i < 8 * sizeof(procmask); i++)
+      count += 1 & (procmask >> i);
+
+  if (count > 0)
+    return count;
+
+  return 1;
+}
+
+
+int uv_cpu_info(uv_cpu_info_t** cpu_infos_ptr, int* cpu_count_ptr) {
+  uv_cpu_info_t* cpu_infos;
+  SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION* sppi;
+  DWORD sppi_size;
+  SYSTEM_INFO system_info;
+  DWORD cpu_count, i;
+  NTSTATUS status;
+  ULONG result_size;
+  int err;
+  uv_cpu_info_t* cpu_info;
+
+  cpu_infos = NULL;
+  cpu_count = 0;
+  sppi = NULL;
+
+  uv__once_init();
+
+  GetSystemInfo(&system_info);
+  cpu_count = system_info.dwNumberOfProcessors;
+
+  cpu_infos = uv__calloc(cpu_count, sizeof *cpu_infos);
+  if (cpu_infos == NULL) {
+    err = ERROR_OUTOFMEMORY;
+    goto error;
+  }
+
+  sppi_size = cpu_count * sizeof(*sppi);
+  sppi = uv__malloc(sppi_size);
+  if (sppi == NULL) {
+    err = ERROR_OUTOFMEMORY;
+    goto error;
+  }
+
+  status = pNtQuerySystemInformation(SystemProcessorPerformanceInformation,
+                                     sppi,
+                                     sppi_size,
+                                     &result_size);
+  if (!NT_SUCCESS(status)) {
+    err = pRtlNtStatusToDosError(status);
+    goto error;
+  }
+
+  assert(result_size == sppi_size);
+
+  for (i = 0; i < cpu_count; i++) {
+    WCHAR key_name[128];
+    HKEY processor_key;
+    DWORD cpu_speed;
+    DWORD cpu_speed_size = sizeof(cpu_speed);
+    WCHAR cpu_brand[256];
+    DWORD cpu_brand_size = sizeof(cpu_brand);
+    size_t len;
+
+    len = _snwprintf(key_name,
+                     ARRAY_SIZE(key_name),
+                     L"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\%d",
+                     i);
+
+    assert(len > 0 && len < ARRAY_SIZE(key_name));
+
+    err = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
+                        key_name,
+                        0,
+                        KEY_QUERY_VALUE,
+                        &processor_key);
+    if (err != ERROR_SUCCESS) {
+      goto error;
+    }
+
+    err = RegQueryValueExW(processor_key,
+                           L"~MHz",
+                           NULL,
+                           NULL,
+                           (BYTE*)&cpu_speed,
+                           &cpu_speed_size);
+    if (err != ERROR_SUCCESS) {
+      RegCloseKey(processor_key);
+      goto error;
+    }
+
+    err = RegQueryValueExW(processor_key,
+                           L"ProcessorNameString",
+                           NULL,
+                           NULL,
+                           (BYTE*)&cpu_brand,
+                           &cpu_brand_size);
+    RegCloseKey(processor_key);
+    if (err != ERROR_SUCCESS)
+      goto error;
+
+    cpu_info = &cpu_infos[i];
+    cpu_info->speed = cpu_speed;
+    cpu_info->cpu_times.user = sppi[i].UserTime.QuadPart / 10000;
+    cpu_info->cpu_times.sys = (sppi[i].KernelTime.QuadPart -
+        sppi[i].IdleTime.QuadPart) / 10000;
+    cpu_info->cpu_times.idle = sppi[i].IdleTime.QuadPart / 10000;
+    cpu_info->cpu_times.irq = sppi[i].InterruptTime.QuadPart / 10000;
+    cpu_info->cpu_times.nice = 0;
+
+    uv__convert_utf16_to_utf8(cpu_brand,
+                              cpu_brand_size / sizeof(WCHAR),
+                              &(cpu_info->model));
+  }
+
+  uv__free(sppi);
+
+  *cpu_count_ptr = cpu_count;
+  *cpu_infos_ptr = cpu_infos;
+
+  return 0;
+
+ error:
+  if (cpu_infos != NULL) {
+    /* This is safe because the cpu_infos array is zeroed on allocation. */
+    for (i = 0; i < cpu_count; i++)
+      uv__free(cpu_infos[i].model);
+  }
+
+  uv__free(cpu_infos);
+  uv__free(sppi);
+
+  return uv_translate_sys_error(err);
+}
+
+
+int uv_interface_addresses(uv_interface_address_t** addresses_ptr,
+    int* count_ptr) {
+  IP_ADAPTER_ADDRESSES* win_address_buf;
+  ULONG win_address_buf_size;
+  IP_ADAPTER_ADDRESSES* adapter;
+
+  uv_interface_address_t* uv_address_buf;
+  char* name_buf;
+  size_t uv_address_buf_size;
+  uv_interface_address_t* uv_address;
+
+  int count;
+  ULONG flags;
+
+  *addresses_ptr = NULL;
+  *count_ptr = 0;
+
+  flags = GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_MULTICAST |
+    GAA_FLAG_SKIP_DNS_SERVER;
+
+  /* Fetch the size of the adapters reported by windows, and then get the list
+   * itself. */
+  win_address_buf_size = 0;
+  win_address_buf = NULL;
+
+  for (;;) {
+    ULONG r;
+
+    /* If win_address_buf is 0, then GetAdaptersAddresses will fail with.
+     * ERROR_BUFFER_OVERFLOW, and the required buffer size will be stored in
+     * win_address_buf_size. */
+    r = GetAdaptersAddresses(AF_UNSPEC,
+                             flags,
+                             NULL,
+                             win_address_buf,
+                             &win_address_buf_size);
+
+    if (r == ERROR_SUCCESS)
+      break;
+
+    uv__free(win_address_buf);
+
+    switch (r) {
+      case ERROR_BUFFER_OVERFLOW:
+        /* This happens when win_address_buf is NULL or too small to hold all
+         * adapters. */
+        win_address_buf = uv__malloc(win_address_buf_size);
+        if (win_address_buf == NULL)
+          return UV_ENOMEM;
+
+        continue;
+
+      case ERROR_NO_DATA: {
+        /* No adapters were found. */
+        uv_address_buf = uv__malloc(1);
+        if (uv_address_buf == NULL)
+          return UV_ENOMEM;
+
+        *count_ptr = 0;
+        *addresses_ptr = uv_address_buf;
+
+        return 0;
+      }
+
+      case ERROR_ADDRESS_NOT_ASSOCIATED:
+        return UV_EAGAIN;
+
+      case ERROR_INVALID_PARAMETER:
+        /* MSDN says:
+         *   "This error is returned for any of the following conditions: the
+         *   SizePointer parameter is NULL, the Address parameter is not
+         *   AF_INET, AF_INET6, or AF_UNSPEC, or the address information for
+         *   the parameters requested is greater than ULONG_MAX."
+         * Since the first two conditions are not met, it must be that the
+         * adapter data is too big.
+         */
+        return UV_ENOBUFS;
+
+      default:
+        /* Other (unspecified) errors can happen, but we don't have any special
+         * meaning for them. */
+        assert(r != ERROR_SUCCESS);
+        return uv_translate_sys_error(r);
+    }
+  }
+
+  /* Count the number of enabled interfaces and compute how much space is
+   * needed to store their info. */
+  count = 0;
+  uv_address_buf_size = 0;
+
+  for (adapter = win_address_buf;
+       adapter != NULL;
+       adapter = adapter->Next) {
+    IP_ADAPTER_UNICAST_ADDRESS* unicast_address;
+    int name_size;
+
+    /* Interfaces that are not 'up' should not be reported. Also skip
+     * interfaces that have no associated unicast address, as to avoid
+     * allocating space for the name for this interface. */
+    if (adapter->OperStatus != IfOperStatusUp ||
+        adapter->FirstUnicastAddress == NULL)
+      continue;
+
+    /* Compute the size of the interface name. */
+    name_size = uv_utf16_length_as_wtf8(adapter->FriendlyName, -1);
+    uv_address_buf_size += name_size + 1;
+
+    /* Count the number of addresses associated with this interface, and
+     * compute the size. */
+    for (unicast_address = (IP_ADAPTER_UNICAST_ADDRESS*)
+                           adapter->FirstUnicastAddress;
+         unicast_address != NULL;
+         unicast_address = unicast_address->Next) {
+      count++;
+      uv_address_buf_size += sizeof(uv_interface_address_t);
+    }
+  }
+
+  /* Allocate space to store interface data plus adapter names. */
+  uv_address_buf = uv__malloc(uv_address_buf_size);
+  if (uv_address_buf == NULL) {
+    uv__free(win_address_buf);
+    return UV_ENOMEM;
+  }
+
+  /* Compute the start of the uv_interface_address_t array, and the place in
+   * the buffer where the interface names will be stored. */
+  uv_address = uv_address_buf;
+  name_buf = (char*) (uv_address_buf + count);
+
+  /* Fill out the output buffer. */
+  for (adapter = win_address_buf;
+       adapter != NULL;
+       adapter = adapter->Next) {
+    IP_ADAPTER_UNICAST_ADDRESS* unicast_address;
+    size_t name_size;
+    int r;
+
+    if (adapter->OperStatus != IfOperStatusUp ||
+        adapter->FirstUnicastAddress == NULL)
+      continue;
+
+    /* Convert the interface name to UTF8. */
+    name_size = (char*) uv_address_buf + uv_address_buf_size - name_buf;
+    r = uv__copy_utf16_to_utf8(adapter->FriendlyName,
+                               -1,
+                               name_buf,
+                               &name_size);
+    if (r) {
+      uv__free(win_address_buf);
+      uv__free(uv_address_buf);
+      return r;
+    }
+    name_size += 1; /* Add NUL byte. */
+
+    /* Add an uv_interface_address_t element for every unicast address. */
+    for (unicast_address = (IP_ADAPTER_UNICAST_ADDRESS*)
+                           adapter->FirstUnicastAddress;
+         unicast_address != NULL;
+         unicast_address = unicast_address->Next) {
+      struct sockaddr* sa;
+      ULONG prefix_len;
+
+      sa = unicast_address->Address.lpSockaddr;
+
+      prefix_len =
+        ((IP_ADAPTER_UNICAST_ADDRESS_LH*) unicast_address)->OnLinkPrefixLength;
+
+      memset(uv_address, 0, sizeof *uv_address);
+
+      uv_address->name = name_buf;
+
+      if (adapter->PhysicalAddressLength == sizeof(uv_address->phys_addr)) {
+        memcpy(uv_address->phys_addr,
+               adapter->PhysicalAddress,
+               sizeof(uv_address->phys_addr));
+      }
+
+      uv_address->is_internal =
+          (adapter->IfType == IF_TYPE_SOFTWARE_LOOPBACK);
+
+      if (sa->sa_family == AF_INET6) {
+        uv_address->address.address6 = *((struct sockaddr_in6 *) sa);
+
+        uv_address->netmask.netmask6.sin6_family = AF_INET6;
+        memset(uv_address->netmask.netmask6.sin6_addr.s6_addr, 0xff, prefix_len >> 3);
+        /* This check ensures that we don't write past the size of the data. */
+        if (prefix_len % 8) {
+          uv_address->netmask.netmask6.sin6_addr.s6_addr[prefix_len >> 3] =
+              0xff << (8 - prefix_len % 8);
+        }
+
+      } else {
+        uv_address->address.address4 = *((struct sockaddr_in *) sa);
+
+        uv_address->netmask.netmask4.sin_family = AF_INET;
+        uv_address->netmask.netmask4.sin_addr.s_addr = (prefix_len > 0) ?
+            htonl(0xffffffff << (32 - prefix_len)) : 0;
+      }
+
+      uv_address++;
+    }
+
+    name_buf += name_size;
+  }
+
+  uv__free(win_address_buf);
+
+  *addresses_ptr = uv_address_buf;
+  *count_ptr = count;
+
+  return 0;
+}
+
+
+void uv_free_interface_addresses(uv_interface_address_t* addresses,
+    int count) {
+  uv__free(addresses);
+}
+
+
+int uv_getrusage(uv_rusage_t *uv_rusage) {
+  FILETIME create_time, exit_time, kernel_time, user_time;
+  SYSTEMTIME kernel_system_time, user_system_time;
+  PROCESS_MEMORY_COUNTERS mem_counters;
+  IO_COUNTERS io_counters;
+  int ret;
+
+  ret = GetProcessTimes(GetCurrentProcess(),
+                        &create_time,
+                        &exit_time,
+                        &kernel_time,
+                        &user_time);
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  ret = FileTimeToSystemTime(&kernel_time, &kernel_system_time);
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  ret = FileTimeToSystemTime(&user_time, &user_system_time);
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  ret = GetProcessMemoryInfo(GetCurrentProcess(),
+                             &mem_counters,
+                             sizeof(mem_counters));
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  ret = GetProcessIoCounters(GetCurrentProcess(), &io_counters);
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  memset(uv_rusage, 0, sizeof(*uv_rusage));
+
+  uv_rusage->ru_utime.tv_sec = user_system_time.wHour * 3600 +
+                               user_system_time.wMinute * 60 +
+                               user_system_time.wSecond;
+  uv_rusage->ru_utime.tv_usec = user_system_time.wMilliseconds * 1000;
+
+  uv_rusage->ru_stime.tv_sec = kernel_system_time.wHour * 3600 +
+                               kernel_system_time.wMinute * 60 +
+                               kernel_system_time.wSecond;
+  uv_rusage->ru_stime.tv_usec = kernel_system_time.wMilliseconds * 1000;
+
+  uv_rusage->ru_majflt = (uint64_t) mem_counters.PageFaultCount;
+  uv_rusage->ru_maxrss = (uint64_t) mem_counters.PeakWorkingSetSize / 1024;
+
+  uv_rusage->ru_oublock = (uint64_t) io_counters.WriteOperationCount;
+  uv_rusage->ru_inblock = (uint64_t) io_counters.ReadOperationCount;
+
+  return 0;
+}
+
+
+int uv_getrusage_thread(uv_rusage_t* uv_rusage) {
+  FILETIME create_time, exit_time, kernel_time, user_time;
+  SYSTEMTIME kernel_system_time, user_system_time;
+  int ret;
+
+  ret = GetThreadTimes(GetCurrentThread(),
+                       &create_time,
+                       &exit_time,
+                       &kernel_time,
+                       &user_time);
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  ret = FileTimeToSystemTime(&kernel_time, &kernel_system_time);
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  ret = FileTimeToSystemTime(&user_time, &user_system_time);
+  if (ret == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  memset(uv_rusage, 0, sizeof(*uv_rusage));
+
+  uv_rusage->ru_utime.tv_sec = user_system_time.wHour * 3600 +
+                               user_system_time.wMinute * 60 +
+                               user_system_time.wSecond;
+  uv_rusage->ru_utime.tv_usec = user_system_time.wMilliseconds * 1000;
+
+  uv_rusage->ru_stime.tv_sec = kernel_system_time.wHour * 3600 +
+                               kernel_system_time.wMinute * 60 +
+                               kernel_system_time.wSecond;
+  uv_rusage->ru_stime.tv_usec = kernel_system_time.wMilliseconds * 1000;
+
+  return 0;
+}
+
+
+int uv_os_homedir(char* buffer, size_t* size) {
+  uv_passwd_t pwd;
+  size_t len;
+  int r;
+
+  /* Check if the USERPROFILE environment variable is set first. The task of
+     performing input validation on buffer and size is taken care of by
+     uv_os_getenv(). */
+  r = uv_os_getenv("USERPROFILE", buffer, size);
+
+  /* Don't return an error if USERPROFILE was not found. */
+  if (r != UV_ENOENT) {
+    /* USERPROFILE is empty or invalid */
+    if (r == 0 && *size < 3) {
+      return UV_ENOENT;
+    }
+    return r;
+  }
+
+  /* USERPROFILE is not set, so call uv_os_get_passwd() */
+  r = uv_os_get_passwd(&pwd);
+
+  if (r != 0) {
+    return r;
+  }
+
+  len = strlen(pwd.homedir);
+
+  if (len >= *size) {
+    *size = len + 1;
+    uv_os_free_passwd(&pwd);
+    return UV_ENOBUFS;
+  }
+
+  memcpy(buffer, pwd.homedir, len + 1);
+  *size = len;
+  uv_os_free_passwd(&pwd);
+
+  return 0;
+}
+
+
+int uv_os_tmpdir(char* buffer, size_t* size) {
+  int r;
+  wchar_t *path;
+  size_t len;
+
+  if (buffer == NULL || size == NULL || *size == 0)
+    return UV_EINVAL;
+
+  len = 0;
+  len = GetTempPathW(0, NULL);
+  if (len == 0) {
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  /* tmp path is empty or invalid */
+  if (len < 3) {
+    return UV_ENOENT;
+  }
+
+  /* Include space for terminating null char. */
+  len += 1;
+  path = uv__malloc(len * sizeof(wchar_t));
+  if (path == NULL) {
+    return UV_ENOMEM;
+  }
+  len = GetTempPathW(len, path);
+
+  if (len == 0) {
+    uv__free(path);
+    return uv_translate_sys_error(GetLastError());
+  }
+
+  /* The returned directory should not have a trailing slash, unless it points
+   * at a drive root, like c:\. Remove it if needed. */
+  if (path[len - 1] == L'\\' &&
+      !(len == 3 && path[1] == L':')) {
+    len--;
+    path[len] = L'\0';
+  }
+
+  r = uv__copy_utf16_to_utf8(path, len, buffer, size);
+  uv__free(path);
+  return r;
+}
+
+
+/*
+ * Converts a UTF-16 string into a UTF-8 one. The resulting string is
+ * null-terminated.
+ *
+ * If utf16 is null terminated, utf16len can be set to -1, otherwise it must
+ * be specified.
+ */
+int uv__convert_utf16_to_utf8(const WCHAR* utf16, size_t utf16len, char** utf8) {
+  size_t utf8_len = 0;
+
+  if (utf16 == NULL)
+    return UV_EINVAL;
+
+   *utf8 = NULL;
+   return uv_utf16_to_wtf8(utf16, utf16len, utf8, &utf8_len);
+}
+
+
+/*
+ * Converts a UTF-8 string into a UTF-16 one. The resulting string is
+ * null-terminated.
+ */
+int uv__convert_utf8_to_utf16(const char* utf8, WCHAR** utf16) {
+  int bufsize;
+
+  if (utf8 == NULL)
+    return UV_EINVAL;
+
+  /* Check how much space we need (including NUL). */
+  bufsize = uv_wtf8_length_as_utf16(utf8);
+  if (bufsize < 0)
+    return UV__EINVAL;
+
+  /* Allocate the destination buffer. */
+  *utf16 = uv__malloc(sizeof(WCHAR) * bufsize);
+
+  if (*utf16 == NULL)
+    return UV_ENOMEM;
+
+  /* Convert to UTF-16 */
+  uv_wtf8_to_utf16(utf8, *utf16, bufsize);
+
+  return 0;
+}
+
+
+/*
+ * Converts a UTF-16 string into a UTF-8 one in an existing buffer. The
+ * resulting string is null-terminated.
+ *
+ * If utf16 is null terminated, utf16len can be set to -1, otherwise it must
+ * be specified.
+ */
+int uv__copy_utf16_to_utf8(const WCHAR* utf16buffer, size_t utf16len, char* utf8, size_t *size) {
+  int r;
+
+  if (utf8 == NULL || size == NULL)
+    return UV_EINVAL;
+
+  if (*size == 0) {
+    *size = uv_utf16_length_as_wtf8(utf16buffer, utf16len);
+    r = UV_ENOBUFS;
+  } else {
+    *size -= 1; /* Reserve space for NUL. */
+    r = uv_utf16_to_wtf8(utf16buffer, utf16len, &utf8, size);
+  }
+  if (r == UV_ENOBUFS)
+    *size += 1; /* Add space for NUL. */
+  return r;
+}
+
+
+static int uv__getpwuid_r(uv_passwd_t* pwd) {
+  HANDLE token;
+  wchar_t username[UNLEN + 1];
+  wchar_t *path;
+  DWORD bufsize;
+  int r;
+
+  if (pwd == NULL)
+    return UV_EINVAL;
+
+  /* Get the home directory using GetUserProfileDirectoryW() */
+  if (OpenProcessToken(GetCurrentProcess(), TOKEN_READ, &token) == 0)
+    return uv_translate_sys_error(GetLastError());
+
+  bufsize = 0;
+  GetUserProfileDirectoryW(token, NULL, &bufsize);
+  if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
+    r = GetLastError();
+    CloseHandle(token);
+    return uv_translate_sys_error(r);
+  }
+
+  path = uv__malloc(bufsize * sizeof(wchar_t));
+  if (path == NULL) {
+    CloseHandle(token);
+    return UV_ENOMEM;
+  }
+
+  if (!GetUserProfileDirectoryW(token, path, &bufsize)) {
+    r = GetLastError();
+    CloseHandle(token);
+    uv__free(path);
+    return uv_translate_sys_error(r);
+  }
+
+  CloseHandle(token);
+
+  /* Get the username using GetUserNameW() */
+  bufsize = ARRAY_SIZE(username);
+  if (!GetUserNameW(username, &bufsize)) {
+    r = GetLastError();
+    uv__free(path);
+
+    /* This should not be possible */
+    if (r == ERROR_INSUFFICIENT_BUFFER)
+      return UV_ENOMEM;
+
+    return uv_translate_sys_error(r);
+  }
+
+  pwd->homedir = NULL;
+  r = uv__convert_utf16_to_utf8(path, -1, &pwd->homedir);
+  uv__free(path);
+
+  if (r != 0)
+    return r;
+
+  pwd->username = NULL;
+  r = uv__convert_utf16_to_utf8(username, -1, &pwd->username);
+
+  if (r != 0) {
+    uv__free(pwd->homedir);
+    return r;
+  }
+
+  pwd->shell = NULL;
+  pwd->uid = -1;
+  pwd->gid = -1;
+
+  return 0;
+}
+
+
+int uv_os_get_passwd(uv_passwd_t* pwd) {
+  return uv__getpwuid_r(pwd);
+}
+
+
+int uv_os_get_passwd2(uv_passwd_t* pwd, uv_uid_t uid) {
+  return UV_ENOTSUP;
+}
+
+
+int uv_os_get_group(uv_group_t* grp, uv_uid_t gid) {
+  return UV_ENOTSUP;
+}
+
+
+int uv_os_environ(uv_env_item_t** envitems, int* count) {
+  wchar_t* env;
+  wchar_t* penv;
+  int i, cnt;
+  uv_env_item_t* envitem;
+
+  *envitems = NULL;
+  *count = 0;
+
+  env = GetEnvironmentStringsW();
+  if (env == NULL)
+    return 0;
+
+  for (penv = env, i = 0; *penv != L'\0'; penv += wcslen(penv) + 1, i++);
+
+  *envitems = uv__calloc(i, sizeof(**envitems));
+  if (*envitems == NULL) {
+    FreeEnvironmentStringsW(env);
+    return UV_ENOMEM;
+  }
+
+  penv = env;
+  cnt = 0;
+
+  while (*penv != L'\0' && cnt < i) {
+    char* buf;
+    char* ptr;
+
+    if (uv__convert_utf16_to_utf8(penv, -1, &buf) != 0)
+      goto fail;
+
+    /* Using buf + 1 here because we know that `buf` has length at least 1,
+     * and some special environment variables on Windows start with a = sign. */
+    ptr = strchr(buf + 1, '=');
+    if (ptr == NULL) {
+      uv__free(buf);
+      goto do_continue;
+    }
+
+    *ptr = '\0';
+
+    envitem = &(*envitems)[cnt];
+    envitem->name = buf;
+    envitem->value = ptr + 1;
+
+    cnt++;
+
+  do_continue:
+    penv += wcslen(penv) + 1;
+  }
+
+  FreeEnvironmentStringsW(env);
+
+  *count = cnt;
+  return 0;
+
+fail:
+  FreeEnvironmentStringsW(env);
+
+  for (i = 0; i < cnt; i++) {
+    envitem = &(*envitems)[cnt];
+    uv__free(envitem->name);
+  }
+  uv__free(*envitems);
+
+  *envitems = NULL;
+  *count = 0;
+  return UV_ENOMEM;
+}
+
+
+int uv_os_getenv(const char* name, char* buffer, size_t* size) {
+  wchar_t fastvar[512];
+  wchar_t* var;
+  DWORD varlen;
+  wchar_t* name_w;
+  size_t len;
+  int r;
+
+  if (name == NULL || buffer == NULL || size == NULL || *size == 0)
+    return UV_EINVAL;
+
+  r = uv__convert_utf8_to_utf16(name, &name_w);
+
+  if (r != 0)
+    return r;
+
+  var = fastvar;
+  varlen = ARRAY_SIZE(fastvar);
+
+  for (;;) {
+    SetLastError(ERROR_SUCCESS);
+    len = GetEnvironmentVariableW(name_w, var, varlen);
+
+    if (len == 0)
+      r = uv_translate_sys_error(GetLastError());
+
+    if (len < varlen)
+      break;
+
+    /* Try repeatedly because we might have been preempted by another thread
+     * modifying the environment variable just as we're trying to read it.
+     */
+    if (var != fastvar)
+      uv__free(var);
+
+    varlen = 1 + len;
+    var = uv__malloc(varlen * sizeof(*var));
+
+    if (var == NULL) {
+      r = UV_ENOMEM;
+      goto fail;
+    }
+  }
+
+  uv__free(name_w);
+  name_w = NULL;
+
+  if (r == 0)
+    r = uv__copy_utf16_to_utf8(var, len, buffer, size);
+
+fail:
+
+  if (name_w != NULL)
+    uv__free(name_w);
+
+  if (var != fastvar)
+    uv__free(var);
+
+  return r;
+}
+
+
+int uv_os_setenv(const char* name, const char* value) {
+  wchar_t* name_w;
+  wchar_t* value_w;
+  int r;
+
+  if (name == NULL || value == NULL)
+    return UV_EINVAL;
+
+  r = uv__convert_utf8_to_utf16(name, &name_w);
+
+  if (r != 0)
+    return r;
+
+  r = uv__convert_utf8_to_utf16(value, &value_w);
+
+  if (r != 0) {
+    uv__free(name_w);
+    return r;
+  }
+
+  r = SetEnvironmentVariableW(name_w, value_w);
+  uv__free(name_w);
+  uv__free(value_w);
+
+  if (r == 0)
+    return uv_translate_sys_error(GetLastError());
+
+  return 0;
+}
+
+
+int uv_os_unsetenv(const char* name) {
+  wchar_t* name_w;
+  int r;
+
+  if (name == NULL)
+    return UV_EINVAL;
+
+  r = uv__convert_utf8_to_utf16(name, &name_w);
+
+  if (r != 0)
+    return r;
+
+  r = SetEnvironmentVariableW(name_w, NULL);
+  uv__free(name_w);
+
+  if (r == 0)
+    return uv_translate_sys_error(GetLastError());
+
+  return 0;
+}
+
+
+int uv_os_gethostname(char* buffer, size_t* size) {
+  WCHAR buf[UV_MAXHOSTNAMESIZE];
+
+  if (buffer == NULL || size == NULL || *size == 0)
+    return UV_EINVAL;
+
+  uv__once_init(); /* Initialize winsock */
+
+  if (pGetHostNameW == NULL)
+    return UV_ENOSYS;
+
+  if (pGetHostNameW(buf, UV_MAXHOSTNAMESIZE) != 0)
+    return uv_translate_sys_error(WSAGetLastError());
+
+  return uv__copy_utf16_to_utf8(buf, -1, buffer, size);
+}
+
+
+static int uv__get_handle(uv_pid_t pid, int access, HANDLE* handle) {
+  int r;
+
+  if (pid == 0)
+    *handle = GetCurrentProcess();
+  else
+    *handle = OpenProcess(access, FALSE, pid);
+
+  if (*handle == NULL) {
+    r = GetLastError();
+
+    if (r == ERROR_INVALID_PARAMETER)
+      return UV_ESRCH;
+    else
+      return uv_translate_sys_error(r);
+  }
+
+  return 0;
+}
+
+
+int uv_os_getpriority(uv_pid_t pid, int* priority) {
+  HANDLE handle;
+  int r;
+
+  if (priority == NULL)
+    return UV_EINVAL;
+
+  r = uv__get_handle(pid, PROCESS_QUERY_LIMITED_INFORMATION, &handle);
+
+  if (r != 0)
+    return r;
+
+  r = GetPriorityClass(handle);
+
+  if (r == 0) {
+    r = uv_translate_sys_error(GetLastError());
+  } else {
+    /* Map Windows priority classes to Unix nice values. */
+    if (r == REALTIME_PRIORITY_CLASS)
+      *priority = UV_PRIORITY_HIGHEST;
+    else if (r == HIGH_PRIORITY_CLASS)
+      *priority = UV_PRIORITY_HIGH;
+    else if (r == ABOVE_NORMAL_PRIORITY_CLASS)
+      *priority = UV_PRIORITY_ABOVE_NORMAL;
+    else if (r == NORMAL_PRIORITY_CLASS)
+      *priority = UV_PRIORITY_NORMAL;
+    else if (r == BELOW_NORMAL_PRIORITY_CLASS)
+      *priority = UV_PRIORITY_BELOW_NORMAL;
+    else  /* IDLE_PRIORITY_CLASS */
+      *priority = UV_PRIORITY_LOW;
+
+    r = 0;
+  }
+
+  CloseHandle(handle);
+  return r;
+}
+
+
+int uv_os_setpriority(uv_pid_t pid, int priority) {
+  HANDLE handle;
+  int priority_class;
+  int r;
+
+  /* Map Unix nice values to Windows priority classes. */
+  if (priority < UV_PRIORITY_HIGHEST || priority > UV_PRIORITY_LOW)
+    return UV_EINVAL;
+  else if (priority < UV_PRIORITY_HIGH)
+    priority_class = REALTIME_PRIORITY_CLASS;
+  else if (priority < UV_PRIORITY_ABOVE_NORMAL)
+    priority_class = HIGH_PRIORITY_CLASS;
+  else if (priority < UV_PRIORITY_NORMAL)
+    priority_class = ABOVE_NORMAL_PRIORITY_CLASS;
+  else if (priority < UV_PRIORITY_BELOW_NORMAL)
+    priority_class = NORMAL_PRIORITY_CLASS;
+  else if (priority < UV_PRIORITY_LOW)
+    priority_class = BELOW_NORMAL_PRIORITY_CLASS;
+  else
+    priority_class = IDLE_PRIORITY_CLASS;
+
+  r = uv__get_handle(pid, PROCESS_SET_INFORMATION, &handle);
+
+  if (r != 0)
+    return r;
+
+  if (SetPriorityClass(handle, priority_class) == 0)
+    r = uv_translate_sys_error(GetLastError());
+
+  CloseHandle(handle);
+  return r;
+}
+
+int uv_thread_getpriority(uv_thread_t tid, int* priority) {
+  int r;
+
+  if (priority == NULL)
+    return UV_EINVAL;
+
+  r = GetThreadPriority(tid);
+  if (r == THREAD_PRIORITY_ERROR_RETURN)
+    return uv_translate_sys_error(GetLastError());
+
+  *priority = r;
+  return 0;
+}
+
+int uv_thread_setpriority(uv_thread_t tid, int priority) {
+  int r;
+
+  switch (priority) {
+    case UV_THREAD_PRIORITY_HIGHEST:
+      r = SetThreadPriority(tid, THREAD_PRIORITY_HIGHEST);
+      break;
+    case UV_THREAD_PRIORITY_ABOVE_NORMAL:
+      r = SetThreadPriority(tid, THREAD_PRIORITY_ABOVE_NORMAL);
+      break;
+    case UV_THREAD_PRIORITY_NORMAL:
+      r = SetThreadPriority(tid, THREAD_PRIORITY_NORMAL);
+      break;
+    case UV_THREAD_PRIORITY_BELOW_NORMAL:
+      r = SetThreadPriority(tid, THREAD_PRIORITY_BELOW_NORMAL);
+      break;
+    case UV_THREAD_PRIORITY_LOWEST:
+      r = SetThreadPriority(tid, THREAD_PRIORITY_LOWEST);
+      break;
+    default:
+      return 0;
+  }
+
+  if (r == 0)
+    return uv_translate_sys_error(GetLastError());
+
+  return 0;
+}
+
+int uv_os_uname(uv_utsname_t* buffer) {
+  /* Implementation loosely based on
+     https://github.com/gagern/gnulib/blob/master/lib/uname.c */
+  OSVERSIONINFOW os_info;
+  SYSTEM_INFO system_info;
+  HKEY registry_key;
+  WCHAR product_name_w[256];
+  DWORD product_name_w_size;
+  size_t version_size;
+  int processor_level;
+  int r;
+
+  if (buffer == NULL)
+    return UV_EINVAL;
+
+  uv__once_init();
+  os_info.dwOSVersionInfoSize = sizeof(os_info);
+  os_info.szCSDVersion[0] = L'\0';
+
+  pRtlGetVersion(&os_info);
+
+  /* Populate the version field. */
+  version_size = 0;
+  r = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
+                    L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion",
+                    0,
+                    KEY_QUERY_VALUE | KEY_WOW64_64KEY,
+                    &registry_key);
+
+  if (r == ERROR_SUCCESS) {
+    product_name_w_size = sizeof(product_name_w);
+    r = RegGetValueW(registry_key,
+                     NULL,
+                     L"ProductName",
+                     RRF_RT_REG_SZ,
+                     NULL,
+                     (PVOID) product_name_w,
+                     &product_name_w_size);
+    RegCloseKey(registry_key);
+
+    if (r == ERROR_SUCCESS) {
+      /* Windows 11 shares dwMajorVersion with Windows 10
+       * this workaround tries to disambiguate that by checking
+       * if the dwBuildNumber is from Windows 11 releases (>= 22000).
+       *
+       * This workaround replaces the ProductName key value
+       * from "Windows 10 *" to "Windows 11 *" */
+      if (os_info.dwMajorVersion == 10 &&
+          os_info.dwBuildNumber >= 22000 &&
+          product_name_w_size >= ARRAY_SIZE(L"Windows 10")) {
+        /* If ProductName starts with "Windows 10" */
+        if (wcsncmp(product_name_w, L"Windows 10", ARRAY_SIZE(L"Windows 10") - 1) == 0) {
+          /* Bump 10 to 11 */
+          product_name_w[9] = '1';
+        }
+      }
+
+      version_size = sizeof(buffer->version);
+      r = uv__copy_utf16_to_utf8(product_name_w,
+                                 -1,
+                                 buffer->version,
+                                 &version_size);
+      if (r)
+        goto error;
+    }
+  }
+
+  /* Append service pack information to the version if present. */
+  if (os_info.szCSDVersion[0] != L'\0') {
+    if (version_size > 0)
+      buffer->version[version_size++] = ' ';
+
+    version_size = sizeof(buffer->version) - version_size;
+    r = uv__copy_utf16_to_utf8(os_info.szCSDVersion,
+                               -1,
+                               buffer->version +
+                                 sizeof(buffer->version) - version_size,
+                               &version_size);
+    if (r)
+      goto error;
+  }
+
+  /* Populate the sysname field. */
+#ifdef __MINGW32__
+  r = snprintf(buffer->sysname,
+               sizeof(buffer->sysname),
+               "MINGW32_NT-%u.%u",
+               (unsigned int) os_info.dwMajorVersion,
+               (unsigned int) os_info.dwMinorVersion);
+  assert((size_t)r < sizeof(buffer->sysname));
+#else
+  uv__strscpy(buffer->sysname, "Windows_NT", sizeof(buffer->sysname));
+#endif
+
+  /* Populate the release field. */
+  r = snprintf(buffer->release,
+               sizeof(buffer->release),
+               "%d.%d.%d",
+               (unsigned int) os_info.dwMajorVersion,
+               (unsigned int) os_info.dwMinorVersion,
+               (unsigned int) os_info.dwBuildNumber);
+  assert((size_t)r < sizeof(buffer->release));
+
+  /* Populate the machine field. */
+  GetSystemInfo(&system_info);
+
+  switch (system_info.wProcessorArchitecture) {
+    case PROCESSOR_ARCHITECTURE_AMD64:
+      uv__strscpy(buffer->machine, "x86_64", sizeof(buffer->machine));
+      break;
+    case PROCESSOR_ARCHITECTURE_IA64:
+      uv__strscpy(buffer->machine, "ia64", sizeof(buffer->machine));
+      break;
+    case PROCESSOR_ARCHITECTURE_INTEL:
+      uv__strscpy(buffer->machine, "i386", sizeof(buffer->machine));
+
+      if (system_info.wProcessorLevel > 3) {
+        processor_level = system_info.wProcessorLevel < 6 ?
+                          system_info.wProcessorLevel : 6;
+        buffer->machine[1] = '0' + processor_level;
+      }
+
+      break;
+    case PROCESSOR_ARCHITECTURE_IA32_ON_WIN64:
+      uv__strscpy(buffer->machine, "i686", sizeof(buffer->machine));
+      break;
+    case PROCESSOR_ARCHITECTURE_MIPS:
+      uv__strscpy(buffer->machine, "mips", sizeof(buffer->machine));
+      break;
+    case PROCESSOR_ARCHITECTURE_ALPHA:
+    case PROCESSOR_ARCHITECTURE_ALPHA64:
+      uv__strscpy(buffer->machine, "alpha", sizeof(buffer->machine));
+      break;
+    case PROCESSOR_ARCHITECTURE_PPC:
+      uv__strscpy(buffer->machine, "powerpc", sizeof(buffer->machine));
+      break;
+    case PROCESSOR_ARCHITECTURE_SHX:
+      uv__strscpy(buffer->machine, "sh", sizeof(buffer->machine));
+      break;
+    case PROCESSOR_ARCHITECTURE_ARM:
+      uv__strscpy(buffer->machine, "arm", sizeof(buffer->machine));
+      break;
+    default:
+      uv__strscpy(buffer->machine, "unknown", sizeof(buffer->machine));
+      break;
+  }
+
+  return 0;
+
+error:
+  buffer->sysname[0] = '\0';
+  buffer->release[0] = '\0';
+  buffer->version[0] = '\0';
+  buffer->machine[0] = '\0';
+  return r;
+}
+
+int uv_gettimeofday(uv_timeval64_t* tv) {
+  /* Based on https://doxygen.postgresql.org/gettimeofday_8c_source.html */
+  const uint64_t epoch = (uint64_t) 116444736000000000ULL;
+  FILETIME file_time;
+  ULARGE_INTEGER ularge;
+
+  if (tv == NULL)
+    return UV_EINVAL;
+
+  GetSystemTimeAsFileTime(&file_time);
+  ularge.LowPart = file_time.dwLowDateTime;
+  ularge.HighPart = file_time.dwHighDateTime;
+  tv->tv_sec = (int64_t) ((ularge.QuadPart - epoch) / 10000000L);
+  tv->tv_usec = (int32_t) (((ularge.QuadPart - epoch) % 10000000L) / 10);
+  return 0;
+}
+
+int uv__random_rtlgenrandom(void* buf, size_t buflen) {
+  if (buflen == 0)
+    return 0;
+
+  if (SystemFunction036(buf, buflen) == FALSE)
+    return UV_EIO;
+
+  return 0;
+}
+
+void uv_sleep(unsigned int msec) {
+  Sleep(msec);
+}