deps: upgrade to libuv 1.20.2

PR-URL: https://github.com/nodejs/node/pull/20129
Fixes: https://github.com/nodejs/node/issues/20112
Fixes: https://github.com/nodejs/node/issues/19903
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

deps/uv/AUTHORS

@@ -332,3 +332,8 @@ Ryuichi KAWAMATA <ryuichi.kawamata@dena.jp>
 Joyee Cheung <joyeec9h3@gmail.com>
 Michael Kilburn <crusader.mike@gmail.com>
 Ruslan Bekenev <furyinbox@gmail.com>
+Bob Burger <rgburger@beckman.com>
+Thomas Versteeg <thomasversteeg@gmx.com>
+zzzjim <zzzjim@users.noreply.github.com>
+Alex Arslan <ararslan@comcast.net>
+Kyle Farnung <kfarnung@microsoft.com>

deps/uv/ChangeLog

@@ -1,3 +1,39 @@
+2018.04.23, Version 1.20.2 (Stable), c51fd3f66bbb386a1efdeba6812789f35a372d1e
+
+Changes since version 1.20.1:
+
+* zos: use custom semaphore (jBarz)
+
+* win: fix registry API error handling (Kyle Farnung)
+
+* build: add support for 64-bit AIX (Richard Lau)
+
+* aix: guard STATIC_ASSERT for glibc work around (Richard Lau)
+
+
+2018.04.19, Version 1.20.1 (Stable), 36ac2fc8edfd5ff3e9be529be1d4a3f0d5364e94
+
+Changes since version 1.20.0:
+
+* doc,fs: improve documentation (Bob Burger)
+
+* win: return a floored double from uv_uptime() (Refael Ackermann)
+
+* doc: clarify platform specific pipe naming (Thomas Versteeg)
+
+* unix: fix uv_pipe_chmod() on macOS (zzzjim)
+
+* unix: work around glibc semaphore race condition (Anna Henningsen)
+
+* tcp,openbsd: disable Unix TCP check for IPV6_ONLY (Alex Arslan)
+
+* test,openbsd: use RETURN_SKIP in UDP IPv6 tests (Alex Arslan)
+
+* test,openbsd: fix multicast test (Alex Arslan)
+
+* Revert "win, fs: use FILE_WRITE_ATTRIBUTES when opening files" (cjihrig)
+
+
 2018.04.03, Version 1.20.0 (Stable), 0012178ee2b04d9e4a2c66c27cf8891ad8325ceb
 
 Changes since version 1.19.2:

deps/uv/common.gypi

@@ -134,7 +134,7 @@
           }]
         ]
       }],
-      ['OS in "freebsd dragonflybsd linux openbsd solaris android"', {
+      ['OS in "freebsd dragonflybsd linux openbsd solaris android aix"', {
         'cflags': [ '-Wall' ],
         'cflags_cc': [ '-fno-rtti', '-fno-exceptions' ],
         'target_conditions': [
@@ -162,6 +162,10 @@
             'cflags': [ '-pthread' ],
             'ldflags': [ '-pthread' ],
           }],
+          [ 'OS=="aix" and target_arch=="ppc64"', {
+            'cflags': [ '-maix64' ],
+            'ldflags': [ '-maix64' ],
+          }],
         ],
       }],
       ['OS=="mac"', {

deps/uv/configure.ac

@@ -13,7 +13,7 @@
 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 AC_PREREQ(2.57)
-AC_INIT([libuv], [1.20.0], [https://github.com/libuv/libuv/issues])
+AC_INIT([libuv], [1.20.2], [https://github.com/libuv/libuv/issues])
 AC_CONFIG_MACRO_DIR([m4])
 m4_include([m4/libuv-extra-automake-flags.m4])
 m4_include([m4/as_case.m4])

deps/uv/docs/src/fs.rst

@@ -148,8 +148,8 @@ Public members
 
 .. c:member:: void* uv_fs_t.ptr
 
-    Stores the result of :c:func:`uv_fs_readlink` and serves as an alias to
+    Stores the result of :c:func:`uv_fs_readlink` and
-    `statbuf`.
+    :c:func:`uv_fs_realpath` and serves as an alias to `statbuf`.
 
 .. seealso:: The :c:type:`uv_req_t` members also apply.
 
@@ -311,10 +311,12 @@ API
 .. c:function:: int uv_fs_readlink(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_fs_cb cb)
 
     Equivalent to :man:`readlink(2)`.
+    The resulting string is stored in `req->ptr`.
 
 .. c:function:: int uv_fs_realpath(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_fs_cb cb)
 
     Equivalent to :man:`realpath(3)` on Unix. Windows uses `GetFinalPathNameByHandle <https://msdn.microsoft.com/en-us/library/windows/desktop/aa364962(v=vs.85).aspx>`_.
+    The resulting string is stored in `req->ptr`.
 
     .. warning::
         This function has certain platform-specific caveats that were discovered when used in Node.

deps/uv/include/uv-os390.h

@@ -22,7 +22,7 @@
 #ifndef UV_MVS_H
 #define UV_MVS_H
 
-#define UV_PLATFORM_SEM_T int
+#define UV_PLATFORM_SEM_T long
 
 #define UV_PLATFORM_LOOP_FIELDS                                               \
   void* ep;                                                                   \

deps/uv/include/uv-version.h

@@ -32,7 +32,7 @@
 
 #define UV_VERSION_MAJOR 1
 #define UV_VERSION_MINOR 20
-#define UV_VERSION_PATCH 0
+#define UV_VERSION_PATCH 2
 #define UV_VERSION_IS_RELEASE 1
 #define UV_VERSION_SUFFIX ""
 

deps/uv/src/unix/pipe.c

@@ -319,21 +319,6 @@ int uv_pipe_chmod(uv_pipe_t* handle, int mode) {
       mode != (UV_WRITABLE | UV_READABLE))
     return UV_EINVAL;
 
-  if (fstat(uv__stream_fd(handle), &pipe_stat) == -1)
-    return UV__ERR(errno);
-
-  desired_mode = 0;
-  if (mode & UV_READABLE)
-    desired_mode |= S_IRUSR | S_IRGRP | S_IROTH;
-  if (mode & UV_WRITABLE)
-    desired_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
-
-  /* Exit early if pipe already has desired mode. */
-  if ((pipe_stat.st_mode & desired_mode) == desired_mode)
-    return 0;
-
-  pipe_stat.st_mode |= desired_mode;
-
   /* Unfortunately fchmod does not work on all platforms, we will use chmod. */
   name_len = 0;
   r = uv_pipe_getsockname(handle, NULL, &name_len);
@@ -350,6 +335,26 @@ int uv_pipe_chmod(uv_pipe_t* handle, int mode) {
     return r;
   }
 
+  /* stat must be used as fstat has a bug on Darwin */
+  if (stat(name_buffer, &pipe_stat) == -1) {
+    uv__free(name_buffer);
+    return -errno;
+  }
+
+  desired_mode = 0;
+  if (mode & UV_READABLE)
+    desired_mode |= S_IRUSR | S_IRGRP | S_IROTH;
+  if (mode & UV_WRITABLE)
+    desired_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
+
+  /* Exit early if pipe already has desired mode. */
+  if ((pipe_stat.st_mode & desired_mode) == desired_mode) {
+    uv__free(name_buffer);
+    return 0;
+  }
+
+  pipe_stat.st_mode |= desired_mode;
+
   r = chmod(name_buffer, pipe_stat.st_mode);
   uv__free(name_buffer);
 

deps/uv/src/unix/tcp.c

@@ -164,6 +164,7 @@ int uv__tcp_bind(uv_tcp_t* tcp,
   if (setsockopt(tcp->io_watcher.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)))
     return UV__ERR(errno);
 
+#ifndef __OpenBSD__
 #ifdef IPV6_V6ONLY
   if (addr->sa_family == AF_INET6) {
     on = (flags & UV_TCP_IPV6ONLY) != 0;
@@ -179,6 +180,7 @@ int uv__tcp_bind(uv_tcp_t* tcp,
       return UV__ERR(errno);
     }
   }
+#endif
 #endif
 
   errno = 0;

deps/uv/src/unix/thread.c

@@ -37,6 +37,10 @@
 #include <sys/sem.h>
 #endif
 
+#ifdef __GLIBC__
+#include <gnu/libc-version.h>  /* gnu_get_libc_version() */
+#endif
+
 #undef NANOSEC
 #define NANOSEC ((uint64_t) 1e9)
 
@@ -419,109 +423,145 @@ int uv_sem_trywait(uv_sem_t* sem) {
   return UV_EINVAL;  /* Satisfy the compiler. */
 }
 
-#elif defined(__MVS__)
-
-int uv_sem_init(uv_sem_t* sem, unsigned int value) {
-  uv_sem_t semid;
-  int err;
-  union {
-    int val;
-    struct semid_ds* buf;
-    unsigned short* array;
-  } arg;
-
-
-  semid = semget(IPC_PRIVATE, 1, S_IRUSR | S_IWUSR);
-  if (semid == -1)
-    return UV__ERR(errno);
-
-  arg.val = value;
-  if (-1 == semctl(semid, 0, SETVAL, arg)) {
-    err = errno;
-    if (-1 == semctl(*sem, 0, IPC_RMID))
-      abort();
-    return UV__ERR(err);
-  }
-
-  *sem = semid;
-  return 0;
-}
-
-void uv_sem_destroy(uv_sem_t* sem) {
-  if (-1 == semctl(*sem, 0, IPC_RMID))
-    abort();
-}
-
-void uv_sem_post(uv_sem_t* sem) {
-  struct sembuf buf;
-
-  buf.sem_num = 0;
-  buf.sem_op = 1;
-  buf.sem_flg = 0;
-
-  if (-1 == semop(*sem, &buf, 1))
-    abort();
-}
-
-void uv_sem_wait(uv_sem_t* sem) {
-  struct sembuf buf;
-  int op_status;
-
-  buf.sem_num = 0;
-  buf.sem_op = -1;
-  buf.sem_flg = 0;
-
-  do
-    op_status = semop(*sem, &buf, 1);
-  while (op_status == -1 && errno == EINTR);
-
-  if (op_status)
-    abort();
-}
-
-int uv_sem_trywait(uv_sem_t* sem) {
-  struct sembuf buf;
-  int op_status;
-
-  buf.sem_num = 0;
-  buf.sem_op = -1;
-  buf.sem_flg = IPC_NOWAIT;
-
-  do
-    op_status = semop(*sem, &buf, 1);
-  while (op_status == -1 && errno == EINTR);
-
-  if (op_status) {
-    if (errno == EAGAIN)
-      return UV_EAGAIN;
-    abort();
-  }
-
-  return 0;
-}
-
 #else /* !(defined(__APPLE__) && defined(__MACH__)) */
 
-int uv_sem_init(uv_sem_t* sem, unsigned int value) {
+#ifdef __GLIBC__
+
+/* Hack around https://sourceware.org/bugzilla/show_bug.cgi?id=12674
+ * by providing a custom implementation for glibc < 2.21 in terms of other
+ * concurrency primitives.
+ * Refs: https://github.com/nodejs/node/issues/19903 */
+
+/* To preserve ABI compatibility, we treat the uv_sem_t as storage for
+ * a pointer to the actual struct we're using underneath. */
+
+static uv_once_t glibc_version_check_once = UV_ONCE_INIT;
+static int platform_needs_custom_semaphore = 0;
+
+static void glibc_version_check(void) {
+  const char* version = gnu_get_libc_version();
+  platform_needs_custom_semaphore =
+      version[0] == '2' && version[1] == '.' &&
+      atoi(version + 2) < 21;
+}
+
+#elif defined(__MVS__)
+
+#define platform_needs_custom_semaphore 1
+
+#else /* !defined(__GLIBC__) && !defined(__MVS__) */
+
+#define platform_needs_custom_semaphore 0
+
+#endif
+
+typedef struct uv_semaphore_s {
+  uv_mutex_t mutex;
+  uv_cond_t cond;
+  unsigned int value;
+} uv_semaphore_t;
+
+#if defined(__GLIBC__) || platform_needs_custom_semaphore
+STATIC_ASSERT(sizeof(uv_sem_t) >= sizeof(uv_semaphore_t*));
+#endif
+
+static int uv__custom_sem_init(uv_sem_t* sem_, unsigned int value) {
+  int err;
+  uv_semaphore_t* sem;
+
+  sem = uv__malloc(sizeof(*sem));
+  if (sem == NULL)
+    return UV_ENOMEM;
+
+  if ((err = uv_mutex_init(&sem->mutex)) != 0) {
+    uv__free(sem);
+    return err;
+  }
+
+  if ((err = uv_cond_init(&sem->cond)) != 0) {
+    uv_mutex_destroy(&sem->mutex);
+    uv__free(sem);
+    return err;
+  }
+
+  sem->value = value;
+  *(uv_semaphore_t**)sem_ = sem;
+  return 0;
+}
+
+
+static void uv__custom_sem_destroy(uv_sem_t* sem_) {
+  uv_semaphore_t* sem;
+
+  sem = *(uv_semaphore_t**)sem_;
+  uv_cond_destroy(&sem->cond);
+  uv_mutex_destroy(&sem->mutex);
+  uv__free(sem);
+}
+
+
+static void uv__custom_sem_post(uv_sem_t* sem_) {
+  uv_semaphore_t* sem;
+
+  sem = *(uv_semaphore_t**)sem_;
+  uv_mutex_lock(&sem->mutex);
+  sem->value++;
+  if (sem->value == 1)
+    uv_cond_signal(&sem->cond);
+  uv_mutex_unlock(&sem->mutex);
+}
+
+
+static void uv__custom_sem_wait(uv_sem_t* sem_) {
+  uv_semaphore_t* sem;
+
+  sem = *(uv_semaphore_t**)sem_;
+  uv_mutex_lock(&sem->mutex);
+  while (sem->value == 0)
+    uv_cond_wait(&sem->cond, &sem->mutex);
+  sem->value--;
+  uv_mutex_unlock(&sem->mutex);
+}
+
+
+static int uv__custom_sem_trywait(uv_sem_t* sem_) {
+  uv_semaphore_t* sem;
+
+  sem = *(uv_semaphore_t**)sem_;
+  if (uv_mutex_trylock(&sem->mutex) != 0)
+    return UV_EAGAIN;
+
+  if (sem->value == 0) {
+    uv_mutex_unlock(&sem->mutex);
+    return UV_EAGAIN;
+  }
+
+  sem->value--;
+  uv_mutex_unlock(&sem->mutex);
+
+  return 0;
+}
+
+static int uv__sem_init(uv_sem_t* sem, unsigned int value) {
   if (sem_init(sem, 0, value))
     return UV__ERR(errno);
   return 0;
 }
 
 
-void uv_sem_destroy(uv_sem_t* sem) {
+static void uv__sem_destroy(uv_sem_t* sem) {
   if (sem_destroy(sem))
     abort();
 }
 
 
-void uv_sem_post(uv_sem_t* sem) {
+static void uv__sem_post(uv_sem_t* sem) {
   if (sem_post(sem))
     abort();
 }
 
 
-void uv_sem_wait(uv_sem_t* sem) {
+static void uv__sem_wait(uv_sem_t* sem) {
   int r;
 
   do
@@ -533,7 +573,7 @@ void uv_sem_wait(uv_sem_t* sem) {
 }
 
 
-int uv_sem_trywait(uv_sem_t* sem) {
+static int uv__sem_trywait(uv_sem_t* sem) {
   int r;
 
   do
@@ -549,6 +589,49 @@ int uv_sem_trywait(uv_sem_t* sem) {
   return 0;
 }
 
+int uv_sem_init(uv_sem_t* sem, unsigned int value) {
+#ifdef __GLIBC__
+  uv_once(&glibc_version_check_once, glibc_version_check);
+#endif
+
+  if (platform_needs_custom_semaphore)
+    return uv__custom_sem_init(sem, value);
+  else
+    return uv__sem_init(sem, value);
+}
+
+
+void uv_sem_destroy(uv_sem_t* sem) {
+  if (platform_needs_custom_semaphore)
+    uv__custom_sem_destroy(sem);
+  else
+    uv__sem_destroy(sem);
+}
+
+
+void uv_sem_post(uv_sem_t* sem) {
+  if (platform_needs_custom_semaphore)
+    uv__custom_sem_post(sem);
+  else
+    uv__sem_post(sem);
+}
+
+
+void uv_sem_wait(uv_sem_t* sem) {
+  if (platform_needs_custom_semaphore)
+    uv__custom_sem_wait(sem);
+  else
+    uv__sem_wait(sem);
+}
+
+
+int uv_sem_trywait(uv_sem_t* sem) {
+  if (platform_needs_custom_semaphore)
+    return uv__custom_sem_trywait(sem);
+  else
+    return uv__sem_trywait(sem);
+}
+
 #endif /* defined(__APPLE__) && defined(__MACH__) */
 
 

deps/uv/src/win/fs.c

@@ -434,8 +434,6 @@ void fs__open(uv_fs_t* req) {
     access |= FILE_APPEND_DATA;
   }
 
-  access |= FILE_WRITE_ATTRIBUTES;
-
   /*
    * Here is where we deviate significantly from what CRT's _open()
    * does. We indiscriminately use all the sharing modes, to match

deps/uv/src/win/util.c

@@ -587,8 +587,8 @@ int uv_uptime(double* uptime) {
         BYTE* address = (BYTE*) object_type + object_type->DefinitionLength +
                         counter_definition->CounterOffset;
         uint64_t value = *((uint64_t*) address);
-        *uptime = (double) (object_type->PerfTime.QuadPart - value) /
+        *uptime = floor((double) (object_type->PerfTime.QuadPart - value) /
-                  (double) object_type->PerfFreq.QuadPart;
+                        (double) object_type->PerfFreq.QuadPart);
         uv__free(malloced_buffer);
         return 0;
       }
@@ -615,7 +615,7 @@ int uv_cpu_info(uv_cpu_info_t** cpu_infos_ptr, int* cpu_count_ptr) {
   SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION* sppi;
   DWORD sppi_size;
   SYSTEM_INFO system_info;
-  DWORD cpu_count, r, i;
+  DWORD cpu_count, i;
   NTSTATUS status;
   ULONG result_size;
   int err;
@@ -670,34 +670,33 @@ int uv_cpu_info(uv_cpu_info_t** cpu_infos_ptr, int* cpu_count_ptr) {
 
     assert(len > 0 && len < ARRAY_SIZE(key_name));
 
-    r = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
+    err = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
-                      key_name,
+                        key_name,
-                      0,
+                        0,
-                      KEY_QUERY_VALUE,
+                        KEY_QUERY_VALUE,
-                      &processor_key);
+                        &processor_key);
-    if (r != ERROR_SUCCESS) {
+    if (err != ERROR_SUCCESS) {
-      err = GetLastError();
       goto error;
     }
 
-    if (RegQueryValueExW(processor_key,
+    err = RegQueryValueExW(processor_key,
-                         L"~MHz",
+                           L"~MHz",
-                         NULL,
+                           NULL,
-                         NULL,
+                           NULL,
-                         (BYTE*) &cpu_speed,
+                           (BYTE*)&cpu_speed,
-                         &cpu_speed_size) != ERROR_SUCCESS) {
+                           &cpu_speed_size);
-      err = GetLastError();
+    if (err != ERROR_SUCCESS) {
       RegCloseKey(processor_key);
       goto error;
     }
 
-    if (RegQueryValueExW(processor_key,
+    err = RegQueryValueExW(processor_key,
-                         L"ProcessorNameString",
+                           L"ProcessorNameString",
-                         NULL,
+                           NULL,
-                         NULL,
+                           NULL,
-                         (BYTE*) &cpu_brand,
+                           (BYTE*)&cpu_brand,
-                         &cpu_brand_size) != ERROR_SUCCESS) {
+                           &cpu_brand_size);
-      err = GetLastError();
+    if (err != ERROR_SUCCESS) {
       RegCloseKey(processor_key);
       goto error;
     }

deps/uv/test/test-fs.c

@@ -1367,28 +1367,6 @@ TEST_IMPL(fs_chmod) {
 
   check_permission("test_file", 0600);
 
-#ifdef _WIN32
-  /* Test clearing read-only flag from files with Archive flag cleared */
-  /* Make the file read-only and clear archive flag */
-  r = SetFileAttributes("test_file", FILE_ATTRIBUTE_READONLY);
-  ASSERT(r != 0);
-  check_permission("test_file", 0400);
-
-  r = uv_fs_open(NULL, &req, "test_file", 0, 0, NULL);
-  ASSERT(r >= 0);
-  ASSERT(req.result >= 0);
-  uv_fs_req_cleanup(&req);
-
-  r = uv_fs_fchmod(NULL, &req, file, 0600, NULL);
-  ASSERT(r == 0);
-  ASSERT(req.result == 0);
-  uv_fs_req_cleanup(&req);
-
-  check_permission("test_file", 0600);
-  /* Restore Archive flag for rest of the tests */
-  r = SetFileAttributes("test_file", FILE_ATTRIBUTE_ARCHIVE);
-  ASSERT(r != 0);
-#endif
 #ifndef _WIN32
   /* async chmod */
   {

deps/uv/test/test-pipe-set-fchmod.c

@@ -27,6 +27,9 @@ TEST_IMPL(pipe_set_chmod) {
   uv_pipe_t pipe_handle;
   uv_loop_t* loop;
   int r;
+#ifndef _WIN32
+  struct stat stat_buf;
+#endif
 
   loop = uv_default_loop();
 
@@ -44,12 +47,33 @@ TEST_IMPL(pipe_set_chmod) {
     RETURN_SKIP("Insufficient privileges to alter pipe fmode");
   }
   ASSERT(r == 0);
+#ifndef _WIN32
+  stat(TEST_PIPENAME, &stat_buf);
+  ASSERT(stat_buf.st_mode & S_IRUSR);
+  ASSERT(stat_buf.st_mode & S_IRGRP);
+  ASSERT(stat_buf.st_mode & S_IROTH);
+#endif
 
   r = uv_pipe_chmod(&pipe_handle, UV_WRITABLE);
   ASSERT(r == 0);
+#ifndef _WIN32
+  stat(TEST_PIPENAME, &stat_buf);
+  ASSERT(stat_buf.st_mode & S_IWUSR);
+  ASSERT(stat_buf.st_mode & S_IWGRP);
+  ASSERT(stat_buf.st_mode & S_IWOTH);
+#endif
 
   r = uv_pipe_chmod(&pipe_handle, UV_WRITABLE | UV_READABLE);
   ASSERT(r == 0);
+#ifndef _WIN32
+  stat(TEST_PIPENAME, &stat_buf);
+  ASSERT(stat_buf.st_mode & S_IRUSR);
+  ASSERT(stat_buf.st_mode & S_IRGRP);
+  ASSERT(stat_buf.st_mode & S_IROTH);
+  ASSERT(stat_buf.st_mode & S_IWUSR);
+  ASSERT(stat_buf.st_mode & S_IWGRP);
+  ASSERT(stat_buf.st_mode & S_IWOTH);
+#endif
 
   r = uv_pipe_chmod(NULL, UV_WRITABLE | UV_READABLE);
   ASSERT(r == UV_EBADF);

deps/uv/test/test-udp-ipv6.c

@@ -174,6 +174,8 @@ TEST_IMPL(udp_dual_stack) {
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
   if (!can_ipv6_ipv4_dual())
     RETURN_SKIP("IPv6-IPv4 dual stack not supported");
+#elif defined(__OpenBSD__)
+  RETURN_SKIP("IPv6-IPv4 dual stack not supported");
 #endif
 
   do_test(ipv6_recv_ok, 0);

deps/uv/test/test-udp-multicast-join6.c

@@ -123,7 +123,8 @@ TEST_IMPL(udp_multicast_join6) {
     defined(_AIX)               || \
     defined(__MVS__)            || \
     defined(__FreeBSD_kernel__) || \
-    defined(__NetBSD__)
+    defined(__NetBSD__)         || \
+    defined(__OpenBSD__)
   r = uv_udp_set_membership(&client, "ff02::1", "::1%lo0", UV_JOIN_GROUP);
 #else
   r = uv_udp_set_membership(&client, "ff02::1", NULL, UV_JOIN_GROUP);