TYPE3

[iec.git] / src / type3_AndroidCloud / anbox-master / src / anbox / network / socket_helper.cpp

diff --git a/src/type3_AndroidCloud/anbox-master/src/anbox/network/socket_helper.cpp b/src/type3_AndroidCloud/anbox-master/src/anbox/network/socket_helper.cpp
new file mode 100644 (file)
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+++ b/src/type3_AndroidCloud/anbox-master/src/anbox/network/socket_helper.cpp
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+/*
+ * Copyright (C) 2016 Simon Fels <morphis@gravedo.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "anbox/network/socket_helper.h"
+
+#include <sys/stat.h>
+
+#include <cstdio>
+#include <fstream>
+#include <iostream>
+
+#include <boost/exception/errinfo_errno.hpp>
+
+namespace anbox {
+namespace network {
+bool socket_file_exists(std::string const& filename) {
+  struct stat statbuf;
+  bool exists = (0 == stat(filename.c_str(), &statbuf));
+  /* Avoid removing non-socket files */
+  bool is_socket_type = (statbuf.st_mode & S_IFMT) == S_IFSOCK;
+  return exists && is_socket_type;
+}
+
+bool socket_exists(std::string const& socket_name) {
+  try {
+    std::string socket_path{socket_name};
+
+    /* In case an abstract socket name exists with the same name*/
+    socket_path.insert(std::begin(socket_path), ' ');
+
+    /* If the name is contained in this table, it signifies
+     * a process is truly using that socket connection
+     */
+    std::ifstream socket_names_file("/proc/net/unix");
+    std::string line;
+    while (std::getline(socket_names_file, line)) {
+      auto index = line.find(socket_path);
+      /* check for complete match */
+      if (index != std::string::npos &&
+          (index + socket_path.length()) == line.length()) {
+        return true;
+      }
+    }
+  } catch (...) {
+    /* Assume the socket exists */
+    return true;
+  }
+  return false;
+}
+
+std::string remove_socket_if_stale(std::string const& socket_name) {
+  if (socket_file_exists(socket_name) && !socket_exists(socket_name)) {
+    if (std::remove(socket_name.c_str()) != 0) {
+      BOOST_THROW_EXCEPTION(boost::enable_error_info(std::runtime_error(
+                                "Failed removing stale socket file"))
+                            << boost::errinfo_errno(errno));
+    }
+  }
+  return socket_name;
+}
+}  // namespace network
+}  // namespace anbox