Add additional error printing to kqueue failures on Mac.

runtime/bin/eventhandler_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/eventhandler.h"
 
 #include <errno.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <string.h>
@@ skipping 45 matching lines @@
   if (sd->write_tracked_by_kqueue()) {
     EV_SET(events + changes, sd->fd(), EVFILT_WRITE, EV_DELETE, 0, 0, sd);
     ++changes;
     sd->set_write_tracked_by_kqueue(false);
   }
   if (changes > 0) {
     ASSERT(changes <= kMaxChanges);
     int status =
       TEMP_FAILURE_RETRY(kevent(kqueue_fd_, events, changes, NULL, 0, NULL));
     if (status == -1) {
-      FATAL("Failed deleting events from kqueue");
+      FATAL1("Failed deleting events from kqueue: %s\n", strerror(errno));
     }
   }
 }
 
 
 // Update the kqueue registration for SocketData structure to reflect
 // the events currently of interest.
 static void UpdateKqueue(intptr_t kqueue_fd_, SocketData* sd) {
   static const intptr_t kMaxChanges = 2;
   intptr_t changes = 0;
@@ skipping 22 matching lines @@
       EV_SET(events + changes, sd->fd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
       ++changes;
       sd->set_write_tracked_by_kqueue(false);
     }
   }
   if (changes > 0) {
     ASSERT(changes <= kMaxChanges);
     int status =
       TEMP_FAILURE_RETRY(kevent(kqueue_fd_, events, changes, NULL, 0, NULL));
     if (status == -1) {
-      FATAL("Failed updating kqueue");
+      FATAL1("Failed updating kqueue: %s\n", strerror(errno));
     }
   }
 }
 
 
 EventHandlerImplementation::EventHandlerImplementation()
     : socket_map_(&HashMap::SamePointerValue, 16) {
   intptr_t result;
   result = TEMP_FAILURE_RETRY(pipe(interrupt_fds_));
   if (result != 0) {
     FATAL("Pipe creation failed");
   }
   FDUtils::SetNonBlocking(interrupt_fds_[0]);
   timeout_ = kInfinityTimeout;
   timeout_port_ = 0;
 
   kqueue_fd_ = TEMP_FAILURE_RETRY(kqueue());
   if (kqueue_fd_ == -1) {
     FATAL("Failed creating kqueue");
   }
   // Register the interrupt_fd with the kqueue.
   struct kevent event;
   EV_SET(&event, interrupt_fds_[0], EVFILT_READ, EV_ADD, 0, 0, NULL);
   int status = TEMP_FAILURE_RETRY(kevent(kqueue_fd_, &event, 1, NULL, 0, NULL));
   if (status == -1) {
-    FATAL("Failed adding interrupt fd to kqueue");
+    FATAL1("Failed adding interrupt fd to kqueue: %s\n", strerror(errno));
   }
 }
 
 
 EventHandlerImplementation::~EventHandlerImplementation() {
   TEMP_FAILURE_RETRY(close(interrupt_fds_[0]));
   TEMP_FAILURE_RETRY(close(interrupt_fds_[1]));
 }
 
 
@@ skipping 244 matching lines @@
 void* EventHandlerImplementation::GetHashmapKeyFromFd(intptr_t fd) {
   // The hashmap does not support keys with value 0.
   return reinterpret_cast<void*>(fd + 1);
 }
 
 
 uint32_t EventHandlerImplementation::GetHashmapHashFromFd(intptr_t fd) {
   // The hashmap does not support keys with value 0.
   return dart::Utils::WordHash(fd + 1);
 }