From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 ipc/unixfd/UnixFdWatcher.cpp | 128 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 ipc/unixfd/UnixFdWatcher.cpp

(limited to 'ipc/unixfd/UnixFdWatcher.cpp')

diff --git a/ipc/unixfd/UnixFdWatcher.cpp b/ipc/unixfd/UnixFdWatcher.cpp
new file mode 100644
index 000000000..41289a90b
--- /dev/null
+++ b/ipc/unixfd/UnixFdWatcher.cpp
@@ -0,0 +1,128 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <fcntl.h>
+#include "UnixFdWatcher.h"
+
+#ifdef CHROMIUM_LOG
+#undef CHROMIUM_LOG
+#endif
+
+#if defined(MOZ_WIDGET_GONK)
+#include <android/log.h>
+#define CHROMIUM_LOG(args...)  __android_log_print(ANDROID_LOG_INFO, "I/O", args);
+#else
+#include <stdio.h>
+#define IODEBUG true
+#define CHROMIUM_LOG(args...) if (IODEBUG) printf(args);
+#endif
+
+namespace mozilla {
+namespace ipc {
+
+UnixFdWatcher::~UnixFdWatcher()
+{
+  NS_WARNING_ASSERTION(!IsOpen(), "mFd should have been closed already");
+}
+
+void
+UnixFdWatcher::Close()
+{
+  MOZ_ASSERT(MessageLoopForIO::current() == mIOLoop);
+
+  if (NS_WARN_IF(!IsOpen())) {
+    /* mFd should have been open */
+    return;
+  }
+  OnClose();
+  RemoveWatchers(READ_WATCHER|WRITE_WATCHER);
+  mFd.dispose();
+}
+
+void
+UnixFdWatcher::AddWatchers(unsigned long aWatchers, bool aPersistent)
+{
+  MOZ_ASSERT(MessageLoopForIO::current() == mIOLoop);
+  MOZ_ASSERT(IsOpen());
+
+  // Before we add a watcher, we need to remove it! Removing is always
+  // safe, but adding the same watcher twice can lead to endless loops
+  // inside libevent.
+  RemoveWatchers(aWatchers);
+
+  if (aWatchers & READ_WATCHER) {
+    MessageLoopForIO::current()->WatchFileDescriptor(
+      mFd,
+      aPersistent,
+      MessageLoopForIO::WATCH_READ,
+      &mReadWatcher,
+      this);
+  }
+  if (aWatchers & WRITE_WATCHER) {
+    MessageLoopForIO::current()->WatchFileDescriptor(
+      mFd,
+      aPersistent,
+      MessageLoopForIO::WATCH_WRITE,
+      &mWriteWatcher,
+      this);
+  }
+}
+
+void
+UnixFdWatcher::RemoveWatchers(unsigned long aWatchers)
+{
+  MOZ_ASSERT(MessageLoopForIO::current() == mIOLoop);
+  MOZ_ASSERT(IsOpen());
+
+  if (aWatchers & READ_WATCHER) {
+    mReadWatcher.StopWatchingFileDescriptor();
+  }
+  if (aWatchers & WRITE_WATCHER) {
+    mWriteWatcher.StopWatchingFileDescriptor();
+  }
+}
+
+void
+UnixFdWatcher::OnError(const char* aFunction, int aErrno)
+{
+  MOZ_ASSERT(MessageLoopForIO::current() == mIOLoop);
+
+  CHROMIUM_LOG("%s failed with error %d (%s)",
+               aFunction, aErrno, strerror(aErrno));
+}
+
+UnixFdWatcher::UnixFdWatcher(MessageLoop* aIOLoop)
+: mIOLoop(aIOLoop)
+{
+  MOZ_ASSERT(mIOLoop);
+}
+
+UnixFdWatcher::UnixFdWatcher(MessageLoop* aIOLoop, int aFd)
+: mIOLoop(aIOLoop)
+, mFd(aFd)
+{
+  MOZ_ASSERT(mIOLoop);
+}
+
+void
+UnixFdWatcher::SetFd(int aFd)
+{
+  MOZ_ASSERT(MessageLoopForIO::current() == mIOLoop);
+  MOZ_ASSERT(!IsOpen());
+  MOZ_ASSERT(FdIsNonBlocking(aFd));
+
+  mFd = aFd;
+}
+
+bool
+UnixFdWatcher::FdIsNonBlocking(int aFd)
+{
+  int flags = TEMP_FAILURE_RETRY(fcntl(aFd, F_GETFL));
+  return (flags > 0) && (flags & O_NONBLOCK);
+}
+
+}
+}
-- 
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