Implement skeletal ProcessSingleton on Linux to cut down on NOTIMPLEMENTED()s.

We now will refuse to run a second browser process if one is already running;
making the second invocation bring up new windows in the first remains left to
be implemented.

Review URL: http://codereview.chromium.org/20448


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9980 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 71 insertions, 0 deletions

diff --git a/chrome/browser/process_singleton_linux.cc b/chrome/browser/process_singleton_linux.cc
new file mode 100644
index 0000000..4ca8f17
--- /dev/null
+++ b/chrome/browser/process_singleton_linux.cc
@@ -0,0 +1,71 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/process_singleton.h"
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "base/logging.h"
+#include "base/string_util.h"
+
+ProcessSingleton::ProcessSingleton(const FilePath& user_data_dir) {
+  socket_path_ = user_data_dir.Append("Singleton Socket");
+}
+
+ProcessSingleton::~ProcessSingleton() {
+}
+
+bool ProcessSingleton::NotifyOtherProcess() {
+  int sock;
+  sockaddr_un addr;
+  SetupSocket(&sock, &addr);
+
+  if (connect(sock, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0 &&
+      (errno == ENOENT || errno == ECONNREFUSED)) {
+    return false;  // Tell the caller there's nobody to notify.
+  }
+
+  // TODO(port): pass in info to the other process.
+  NOTIMPLEMENTED() << " don't know how to notify other process about us.";
+
+  return true;  // We did our best, so we die here.
+}
+
+void ProcessSingleton::Create() {
+  int sock;
+  sockaddr_un addr;
+  SetupSocket(&sock, &addr);
+
+  if (unlink(socket_path_.value().c_str()) < 0)
+    DCHECK_EQ(errno, ENOENT);
+
+  if (bind(sock, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0)
+    LOG(ERROR) << "bind() failed: " << strerror(errno);
+
+  if (listen(sock, 5) < 0)
+    NOTREACHED() << "listen failed: " << strerror(errno);
+
+  // TODO(port): register this socket as something we care about getting
+  // input on, process messages, etc.
+  NOTIMPLEMENTED() << " need to listen on the singleton socket.";
+}
+
+void ProcessSingleton::HuntForZombieChromeProcesses() {
+  // On Windows, this examines all the chrome.exe processes to see if one
+  // is hung.  TODO(port): should we do anything here?
+  NOTIMPLEMENTED();
+}
+
+void ProcessSingleton::SetupSocket(int* sock, struct sockaddr_un* addr) {
+  *sock = socket(PF_UNIX, SOCK_STREAM, 0);
+  if (*sock < 0)
+    LOG(FATAL) << "socket() failed: " << strerror(errno);
+
+  addr->sun_family = AF_UNIX;
+  base::strlcpy(addr->sun_path, socket_path_.value().c_str(),
+                sizeof(addr->sun_path));
+}