libuv 2017-05-25 (dc596109)

Code extracted from:

    https://github.com/libuv/libuv.git

at commit dc596109d5a22db1dbf57098630eebd30fce8068 (v1.x).

include/uv-posix.h

@@ -0,0 +1,31 @@
+/* Copyright libuv project 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.
+ */
+
+#ifndef UV_POSIX_H
+#define UV_POSIX_H
+
+#define UV_PLATFORM_LOOP_FIELDS                                               \
+  struct pollfd* poll_fds;                                                    \
+  size_t poll_fds_used;                                                       \
+  size_t poll_fds_size;                                                       \
+  unsigned char poll_fds_iterating;                                           \
+
+#endif /* UV_POSIX_H */

include/uv-unix.h

@@ -60,6 +60,8 @@
       defined(__OpenBSD__)         || \
       defined(__NetBSD__)
 # include "uv-bsd.h"
+#elif defined(__CYGWIN__) || defined(__MSYS__)
+# include "uv-posix.h"
 #endif
 
 #ifndef PTHREAD_BARRIER_SERIAL_THREAD

include/uv.h

@@ -1078,6 +1078,8 @@ UV_EXTERN int uv_os_getenv(const char* name, char* buffer, size_t* size);
 UV_EXTERN int uv_os_setenv(const char* name, const char* value);
 UV_EXTERN int uv_os_unsetenv(const char* name);
 
+UV_EXTERN int uv_os_gethostname(char* buffer, size_t* size);
+
 
 typedef enum {
   UV_FS_UNKNOWN = -1,

src/unix/bsd-ifaddrs.c

@@ -27,7 +27,9 @@
 
 #include <ifaddrs.h>
 #include <net/if.h>
+#if !defined(__CYGWIN__) && !defined(__MSYS__)
 #include <net/if_dl.h>
+#endif
 
 static int uv__ifaddr_exclude(struct ifaddrs *ent) {
   if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
@@ -107,9 +109,13 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
 
     for (i = 0; i < *count; i++) {
       if (strcmp(address->name, ent->ifa_name) == 0) {
+#if defined(__CYGWIN__) || defined(__MSYS__)
+        memset(address->phys_addr, 0, sizeof(address->phys_addr));
+#else
         struct sockaddr_dl* sa_addr;
         sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
         memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
+#endif
       }
       address++;
     }

src/unix/core.c

@@ -28,6 +28,7 @@
 #include <errno.h>
 #include <assert.h>
 #include <unistd.h>
+#include <sys/param.h> /* MAXHOSTNAMELEN on Linux and the BSDs */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -42,6 +43,7 @@
 #include <pwd.h>
 
 #ifdef __sun
+# include <netdb.h> /* MAXHOSTNAMELEN on Solaris */
 # include <sys/filio.h>
 # include <sys/types.h>
 # include <sys/wait.h>
@@ -80,6 +82,11 @@
 #include <sys/ioctl.h>
 #endif
 
+/* Fallback for the maximum hostname length */
+#ifndef MAXHOSTNAMELEN
+# define MAXHOSTNAMELEN 256
+#endif
+
 static int uv__run_pending(uv_loop_t* loop);
 
 /* Verify that uv_buf_t is ABI-compatible with struct iovec. */
@@ -538,6 +545,7 @@ int uv__nonblock_ioctl(int fd, int set) {
 }
 
 
+#if !defined(__CYGWIN__) && !defined(__MSYS__)
 int uv__cloexec_ioctl(int fd, int set) {
   int r;
 
@@ -550,6 +558,7 @@ int uv__cloexec_ioctl(int fd, int set) {
 
   return 0;
 }
+#endif
 
 
 int uv__nonblock_fcntl(int fd, int set) {
@@ -1285,3 +1294,33 @@ int uv_os_unsetenv(const char* name) {
 
   return 0;
 }
+
+
+int uv_os_gethostname(char* buffer, size_t* size) {
+  /*
+    On some platforms, if the input buffer is not large enough, gethostname()
+    succeeds, but truncates the result. libuv can detect this and return ENOBUFS
+    instead by creating a large enough buffer and comparing the hostname length
+    to the size input.
+  */
+  char buf[MAXHOSTNAMELEN + 1];
+  size_t len;
+
+  if (buffer == NULL || size == NULL || *size == 0)
+    return -EINVAL;
+
+  if (gethostname(buf, sizeof(buf)) != 0)
+    return -errno;
+
+  buf[sizeof(buf) - 1] = '\0'; /* Null terminate, just to be safe. */
+  len = strlen(buf);
+
+  if (len >= *size) {
+    *size = len + 1;
+    return -ENOBUFS;
+  }
+
+  memcpy(buffer, buf, len + 1);
+  *size = len;
+  return 0;
+}

src/unix/cygwin.c

@@ -0,0 +1,54 @@
+/* Copyright libuv project 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 "uv.h"
+#include "internal.h"
+
+#include <sys/sysinfo.h>
+#include <unistd.h>
+
+int uv_uptime(double* uptime) {
+  struct sysinfo info;
+
+  if (sysinfo(&info) < 0)
+    return -errno;
+
+  *uptime = info.uptime;
+  return 0;
+}
+
+int uv_resident_set_memory(size_t* rss) {
+  /* FIXME: read /proc/meminfo? */
+  *rss = 0;
+  return UV_ENOSYS;
+}
+
+int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count) {
+  /* FIXME: read /proc/stat? */
+  *cpu_infos = NULL;
+  *count = 0;
+  return UV_ENOSYS;
+}
+
+void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count) {
+  (void)cpu_infos;
+  (void)count;
+}

src/unix/fsevents.c

@@ -378,9 +378,6 @@ static void uv__fsevents_destroy_stream(uv_loop_t* loop) {
   if (state->fsevent_stream == NULL)
     return;
 
-  /* Flush all accumulated events */
-  pFSEventStreamFlushSync(state->fsevent_stream);
-
   /* Stop emitting events */
   pFSEventStreamStop(state->fsevent_stream);
 

src/unix/linux-core.c

@@ -472,55 +472,6 @@ uint64_t uv__hrtime(uv_clocktype_t type) {
 }
 
 
-void uv_loadavg(double avg[3]) {
-  struct sysinfo info;
-
-  if (sysinfo(&info) < 0) return;
-
-  avg[0] = (double) info.loads[0] / 65536.0;
-  avg[1] = (double) info.loads[1] / 65536.0;
-  avg[2] = (double) info.loads[2] / 65536.0;
-}
-
-
-int uv_exepath(char* buffer, size_t* size) {
-  ssize_t n;
-
-  if (buffer == NULL || size == NULL || *size == 0)
-    return -EINVAL;
-
-  n = *size - 1;
-  if (n > 0)
-    n = readlink("/proc/self/exe", buffer, n);
-
-  if (n == -1)
-    return -errno;
-
-  buffer[n] = '\0';
-  *size = n;
-
-  return 0;
-}
-
-
-uint64_t uv_get_free_memory(void) {
-  struct sysinfo info;
-
-  if (sysinfo(&info) == 0)
-    return (uint64_t) info.freeram * info.mem_unit;
-  return 0;
-}
-
-
-uint64_t uv_get_total_memory(void) {
-  struct sysinfo info;
-
-  if (sysinfo(&info) == 0)
-    return (uint64_t) info.totalram * info.mem_unit;
-  return 0;
-}
-
-
 int uv_resident_set_memory(size_t* rss) {
   char buf[1024];
   const char* s;

src/unix/no-fsevents.c

@@ -0,0 +1,42 @@
+/* Copyright libuv project 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 "uv.h"
+#include "internal.h"
+
+#include <errno.h>
+
+int uv_fs_event_init(uv_loop_t* loop, uv_fs_event_t* handle) {
+  return -ENOSYS;
+}
+
+int uv_fs_event_start(uv_fs_event_t* handle, uv_fs_event_cb cb,
+                      const char* filename, unsigned int flags) {
+  return -ENOSYS;
+}
+
+int uv_fs_event_stop(uv_fs_event_t* handle) {
+  return -ENOSYS;
+}
+
+void uv__fs_event_close(uv_fs_event_t* handle) {
+  UNREACHABLE();
+}

src/unix/no-proctitle.c

@@ -0,0 +1,42 @@
+/* Copyright libuv project 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 "uv.h"
+#include "internal.h"
+
+#include <errno.h>
+#include <stddef.h>
+
+char** uv_setup_args(int argc, char** argv) {
+  return argv;
+}
+
+int uv_set_process_title(const char* title) {
+  return 0;
+}
+
+int uv_get_process_title(char* buffer, size_t size) {
+  if (buffer == NULL || size == 0)
+    return -EINVAL;
+
+  buffer[0] = '\0';
+  return 0;
+}

src/unix/openbsd.c

@@ -30,7 +30,6 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <kvm.h>
 #include <paths.h>
 #include <stdlib.h>
 #include <string.h>

src/unix/os390.c

@@ -663,28 +663,6 @@ int uv__io_check_fd(uv_loop_t* loop, int fd) {
   return 0;
 }
 
-
-void uv__fs_event_close(uv_fs_event_t* handle) {
-  UNREACHABLE();
-}
-
-
-int uv_fs_event_init(uv_loop_t* loop, uv_fs_event_t* handle) {
-  return -ENOSYS;
-}
-
-
-int uv_fs_event_start(uv_fs_event_t* handle, uv_fs_event_cb cb,
-                      const char* filename, unsigned int flags) {
-  return -ENOSYS;
-}
-
-
-int uv_fs_event_stop(uv_fs_event_t* handle) {
-  return -ENOSYS;
-}
-
-
 void uv__io_poll(uv_loop_t* loop, int timeout) {
   static const int max_safe_timeout = 1789569;
   struct epoll_event events[1024];

src/unix/pipe.c

@@ -181,6 +181,14 @@ void uv_pipe_connect(uv_connect_t* req,
 
   if (r == -1 && errno != EINPROGRESS) {
     err = -errno;
+#if defined(__CYGWIN__) || defined(__MSYS__)
+    /* EBADF is supposed to mean that the socket fd is bad, but
+       Cygwin reports EBADF instead of ENOTSOCK when the file is
+       not a socket.  We do not expect to see a bad fd here
+       (e.g. due to new_sock), so translate the error.  */
+    if (err == -EBADF)
+      err = -ENOTSOCK;
+#endif
     goto out;
   }
 

src/unix/posix-poll.c

@@ -0,0 +1,324 @@
+/* Copyright libuv project 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 "uv.h"
+#include "internal.h"
+
+/* POSIX defines poll() as a portable way to wait on file descriptors.
+ * Here we maintain a dynamically sized array of file descriptors and
+ * events to pass as the first argument to poll().
+ */
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <errno.h>
+#include <unistd.h>
+
+int uv__platform_loop_init(uv_loop_t* loop) {
+  loop->poll_fds = NULL;
+  loop->poll_fds_used = 0;
+  loop->poll_fds_size = 0;
+  loop->poll_fds_iterating = 0;
+  return 0;
+}
+
+void uv__platform_loop_delete(uv_loop_t* loop) {
+  uv__free(loop->poll_fds);
+  loop->poll_fds = NULL;
+}
+
+int uv__io_fork(uv_loop_t* loop) {
+  uv__platform_loop_delete(loop);
+  return uv__platform_loop_init(loop);
+}
+
+/* Allocate or dynamically resize our poll fds array.  */
+static void uv__pollfds_maybe_resize(uv_loop_t* loop) {
+  size_t i;
+  size_t n;
+  struct pollfd* p;
+
+  if (loop->poll_fds_used < loop->poll_fds_size)
+    return;
+
+  n = loop->poll_fds_size ? loop->poll_fds_size * 2 : 64;
+  p = uv__realloc(loop->poll_fds, n * sizeof(*loop->poll_fds));
+  if (p == NULL)
+    abort();
+
+  loop->poll_fds = p;
+  for (i = loop->poll_fds_size; i < n; i++) {
+    loop->poll_fds[i].fd = -1;
+    loop->poll_fds[i].events = 0;
+    loop->poll_fds[i].revents = 0;
+  }
+  loop->poll_fds_size = n;
+}
+
+/* Primitive swap operation on poll fds array elements.  */
+static void uv__pollfds_swap(uv_loop_t* loop, size_t l, size_t r) {
+  struct pollfd pfd;
+  pfd = loop->poll_fds[l];
+  loop->poll_fds[l] = loop->poll_fds[r];
+  loop->poll_fds[r] = pfd;
+}
+
+/* Add a watcher's fd to our poll fds array with its pending events.  */
+static void uv__pollfds_add(uv_loop_t* loop, uv__io_t* w) {
+  size_t i;
+  struct pollfd* pe;
+
+  /* If the fd is already in the set just update its events.  */
+  assert(!loop->poll_fds_iterating);
+  for (i = 0; i < loop->poll_fds_used; ++i) {
+    if (loop->poll_fds[i].fd == w->fd) {
+      loop->poll_fds[i].events = w->pevents;
+      return;
+    }
+  }
+
+  /* Otherwise, allocate a new slot in the set for the fd.  */
+  uv__pollfds_maybe_resize(loop);
+  pe = &loop->poll_fds[loop->poll_fds_used++];
+  pe->fd = w->fd;
+  pe->events = w->pevents;
+}
+
+/* Remove a watcher's fd from our poll fds array.  */
+static void uv__pollfds_del(uv_loop_t* loop, int fd) {
+  size_t i;
+  assert(!loop->poll_fds_iterating);
+  for (i = 0; i < loop->poll_fds_used; ++i) {
+    if (loop->poll_fds[i].fd == fd) {
+      /* swap to last position and remove */
+      --loop->poll_fds_used;
+      uv__pollfds_swap(loop, i, loop->poll_fds_used);
+      loop->poll_fds[loop->poll_fds_used].fd = -1;
+      loop->poll_fds[loop->poll_fds_used].events = 0;
+      loop->poll_fds[loop->poll_fds_used].revents = 0;
+      return;
+    }
+  }
+}
+
+
+void uv__io_poll(uv_loop_t* loop, int timeout) {
+  sigset_t* pset;
+  sigset_t set;
+  uint64_t time_base;
+  uint64_t time_diff;
+  QUEUE* q;
+  uv__io_t* w;
+  size_t i;
+  unsigned int nevents;
+  int nfds;
+  int have_signals;
+  struct pollfd* pe;
+  int fd;
+
+  if (loop->nfds == 0) {
+    assert(QUEUE_EMPTY(&loop->watcher_queue));
+    return;
+  }
+
+  /* Take queued watchers and add their fds to our poll fds array.  */
+  while (!QUEUE_EMPTY(&loop->watcher_queue)) {
+    q = QUEUE_HEAD(&loop->watcher_queue);
+    QUEUE_REMOVE(q);
+    QUEUE_INIT(q);
+
+    w = QUEUE_DATA(q, uv__io_t, watcher_queue);
+    assert(w->pevents != 0);
+    assert(w->fd >= 0);
+    assert(w->fd < (int) loop->nwatchers);
+
+    uv__pollfds_add(loop, w);
+
+    w->events = w->pevents;
+  }
+
+  /* Prepare a set of signals to block around poll(), if any.  */
+  pset = NULL;
+  if (loop->flags & UV_LOOP_BLOCK_SIGPROF) {
+    pset = &set;
+    sigemptyset(pset);
+    sigaddset(pset, SIGPROF);
+  }
+
+  assert(timeout >= -1);
+  time_base = loop->time;
+
+  /* Loop calls to poll() and processing of results.  If we get some
+   * results from poll() but they turn out not to be interesting to
+   * our caller then we need to loop around and poll() again.
+   */
+  for (;;) {
+    if (pset != NULL)
+      if (pthread_sigmask(SIG_BLOCK, pset, NULL))
+        abort();
+    nfds = poll(loop->poll_fds, (nfds_t)loop->poll_fds_used, timeout);
+    if (pset != NULL)
+      if (pthread_sigmask(SIG_UNBLOCK, pset, NULL))
+        abort();
+
+    /* Update loop->time unconditionally. It's tempting to skip the update when
+     * timeout == 0 (i.e. non-blocking poll) but there is no guarantee that the
+     * operating system didn't reschedule our process while in the syscall.
+     */
+    SAVE_ERRNO(uv__update_time(loop));
+
+    if (nfds == 0) {
+      assert(timeout != -1);
+      return;
+    }
+
+    if (nfds == -1) {
+      if (errno != EINTR)
+        abort();
+
+      if (timeout == -1)
+        continue;
+
+      if (timeout == 0)
+        return;
+
+      /* Interrupted by a signal. Update timeout and poll again. */
+      goto update_timeout;
+    }
+
+    /* Tell uv__platform_invalidate_fd not to manipulate our array
+     * while we are iterating over it.
+     */
+    loop->poll_fds_iterating = 1;
+
+    /* Initialize a count of events that we care about.  */
+    nevents = 0;
+    have_signals = 0;
+
+    /* Loop over the entire poll fds array looking for returned events.  */
+    for (i = 0; i < loop->poll_fds_used; i++) {
+      pe = loop->poll_fds + i;
+      fd = pe->fd;
+
+      /* Skip invalidated events, see uv__platform_invalidate_fd.  */
+      if (fd == -1)
+        continue;
+
+      assert(fd >= 0);
+      assert((unsigned) fd < loop->nwatchers);
+
+      w = loop->watchers[fd];
+
+      if (w == NULL) {
+        /* File descriptor that we've stopped watching, ignore.  */
+        uv__platform_invalidate_fd(loop, fd);
+        continue;
+      }
+
+      /* Filter out events that user has not requested us to watch
+       * (e.g. POLLNVAL).
+       */
+      pe->revents &= w->pevents | POLLERR | POLLHUP;
+
+      if (pe->revents != 0) {
+        /* Run signal watchers last.  */
+        if (w == &loop->signal_io_watcher) {
+          have_signals = 1;
+        } else {
+          w->cb(loop, w, pe->revents);
+        }
+
+        nevents++;
+      }
+    }
+
+    if (have_signals != 0)
+      loop->signal_io_watcher.cb(loop, &loop->signal_io_watcher, POLLIN);
+
+    loop->poll_fds_iterating = 0;
+
+    /* Purge invalidated fds from our poll fds array.  */
+    uv__pollfds_del(loop, -1);
+
+    if (have_signals != 0)
+      return;  /* Event loop should cycle now so don't poll again. */
+
+    if (nevents != 0)
+      return;
+
+    if (timeout == 0)
+      return;
+
+    if (timeout == -1)
+      continue;
+
+update_timeout:
+    assert(timeout > 0);
+
+    time_diff = loop->time - time_base;
+    if (time_diff >= (uint64_t) timeout)
+      return;
+
+    timeout -= time_diff;
+  }
+}
+
+/* Remove the given fd from our poll fds array because no one
+ * is interested in its events anymore.
+ */
+void uv__platform_invalidate_fd(uv_loop_t* loop, int fd) {
+  size_t i;
+
+  if (loop->poll_fds_iterating) {
+    /* uv__io_poll is currently iterating.  Just invalidate fd.  */
+    for (i = 0; i < loop->poll_fds_used; i++)
+      if (loop->poll_fds[i].fd == fd) {
+        loop->poll_fds[i].fd = -1;
+        loop->poll_fds[i].events = 0;
+        loop->poll_fds[i].revents = 0;
+      }
+  } else {
+    /* uv__io_poll is not iterating.  Delete fd from the set.  */
+    uv__pollfds_del(loop, fd);
+  }
+}
+
+/* Check whether the given fd is supported by poll().  */
+int uv__io_check_fd(uv_loop_t* loop, int fd) {
+  struct pollfd p[1];
+  int rv;
+
+  p[0].fd = fd;
+  p[0].events = POLLIN;
+
+  do
+    rv = poll(p, 1, 0);
+  while (rv == -1 && (errno == EINTR || errno == EAGAIN));
+
+  if (rv == -1)
+    return -errno;
+
+  if (p[0].revents & POLLNVAL)
+    return -EINVAL;
+
+  return 0;
+}

src/unix/procfs-exepath.c

@@ -0,0 +1,45 @@
+/* Copyright libuv project 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 "uv.h"
+#include "internal.h"
+
+#include <stddef.h>
+#include <unistd.h>
+
+int uv_exepath(char* buffer, size_t* size) {
+  ssize_t n;
+
+  if (buffer == NULL || size == NULL || *size == 0)
+    return -EINVAL;
+
+  n = *size - 1;
+  if (n > 0)
+    n = readlink("/proc/self/exe", buffer, n);
+
+  if (n == -1)
+    return -errno;
+
+  buffer[n] = '\0';
+  *size = n;
+
+  return 0;
+}

src/unix/stream.c

@@ -390,7 +390,7 @@ failed_malloc:
 
 
 int uv__stream_open(uv_stream_t* stream, int fd, int flags) {
-#if defined(__APPLE__) || defined(__MVS__)
+#if defined(__APPLE__)
   int enable;
 #endif
 
@@ -409,7 +409,7 @@ int uv__stream_open(uv_stream_t* stream, int fd, int flags) {
       return -errno;
   }
 
-#if defined(__APPLE__) || defined(__MVS__)
+#if defined(__APPLE__)
   enable = 1;
   if (setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &enable, sizeof(enable)) &&
       errno != ENOTSOCK &&
@@ -1173,6 +1173,11 @@ static void uv__read(uv_stream_t* stream) {
           uv__stream_osx_interrupt_select(stream);
         }
         stream->read_cb(stream, 0, &buf);
+#if defined(__CYGWIN__) || defined(__MSYS__)
+      } else if (errno == ECONNRESET && stream->type == UV_NAMED_PIPE) {
+        uv__stream_eof(stream, &buf);
+        return;
+#endif
       } else {
         /* Error. User should call uv_close(). */
         stream->read_cb(stream, -errno, &buf);
@@ -1405,6 +1410,12 @@ int uv_write2(uv_write_t* req,
      */
     if (uv__handle_fd((uv_handle_t*) send_handle) < 0)
       return -EBADF;
+
+#if defined(__CYGWIN__) || defined(__MSYS__)
+    /* Cygwin recvmsg always sets msg_controllen to zero, so we cannot send it.
+       See https://github.com/mirror/newlib-cygwin/blob/86fc4bf0/winsup/cygwin/fhandler_socket.cc#L1736-L1743 */
+    return -ENOSYS;
+#endif
   }
 
   /* It's legal for write_queue_size > 0 even when the write_queue is empty;

src/unix/sunos.c

@@ -545,25 +545,6 @@ void uv__fs_event_close(uv_fs_event_t* handle) {
 #endif /* defined(PORT_SOURCE_FILE) */
 
 
-char** uv_setup_args(int argc, char** argv) {
-  return argv;
-}
-
-
-int uv_set_process_title(const char* title) {
-  return 0;
-}
-
-
-int uv_get_process_title(char* buffer, size_t size) {
-  if (buffer == NULL || size == 0)
-    return -EINVAL;
-
-  buffer[0] = '\0';
-  return 0;
-}
-
-
 int uv_resident_set_memory(size_t* rss) {
   psinfo_t psinfo;
   int err;

src/unix/sysinfo-loadavg.c

@@ -0,0 +1,36 @@
+/* Copyright libuv project 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 "uv.h"
+#include "internal.h"
+
+#include <stdint.h>
+#include <sys/sysinfo.h>
+
+void uv_loadavg(double avg[3]) {
+  struct sysinfo info;
+
+  if (sysinfo(&info) < 0) return;
+
+  avg[0] = (double) info.loads[0] / 65536.0;
+  avg[1] = (double) info.loads[1] / 65536.0;
+  avg[2] = (double) info.loads[2] / 65536.0;
+}

src/unix/sysinfo-memory.c

@@ -0,0 +1,42 @@
+/* Copyright libuv project 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 "uv.h"
+#include "internal.h"
+
+#include <stdint.h>
+#include <sys/sysinfo.h>
+
+uint64_t uv_get_free_memory(void) {
+  struct sysinfo info;
+
+  if (sysinfo(&info) == 0)
+    return (uint64_t) info.freeram * info.mem_unit;
+  return 0;
+}
+
+uint64_t uv_get_total_memory(void) {
+  struct sysinfo info;
+
+  if (sysinfo(&info) == 0)
+    return (uint64_t) info.totalram * info.mem_unit;
+  return 0;
+}

src/win/util.c

@@ -59,6 +59,14 @@
 # define UNLEN 256
 #endif
 
+/*
+  Max hostname length. The Windows gethostname() documentation states that 256
+  bytes will always be large enough to hold the null-terminated hostname.
+*/
+#ifndef MAXHOSTNAMELEN
+# define MAXHOSTNAMELEN 256
+#endif
+
 /* Maximum environment variable size, including the terminating null */
 #define MAX_ENV_VAR_LENGTH 32767
 
@@ -1540,3 +1548,29 @@ int uv_os_unsetenv(const char* name) {
 
   return 0;
 }
+
+
+int uv_os_gethostname(char* buffer, size_t* size) {
+  char buf[MAXHOSTNAMELEN + 1];
+  size_t len;
+
+  if (buffer == NULL || size == NULL || *size == 0)
+    return UV_EINVAL;
+
+  uv__once_init(); /* Initialize winsock */
+
+  if (gethostname(buf, sizeof(buf)) != 0)
+    return uv_translate_sys_error(WSAGetLastError());
+
+  buf[sizeof(buf) - 1] = '\0'; /* Null terminate, just to be safe. */
+  len = strlen(buf);
+
+  if (len >= *size) {
+    *size = len + 1;
+    return UV_ENOBUFS;
+  }
+
+  memcpy(buffer, buf, len + 1);
+  *size = len;
+  return 0;
+}