TYPE3

[iec.git] / src / type3_AndroidCloud / anbox-master / src / anbox / common / loop_device_allocator.cpp

diff --git a/src/type3_AndroidCloud/anbox-master/src/anbox/common/loop_device_allocator.cpp b/src/type3_AndroidCloud/anbox-master/src/anbox/common/loop_device_allocator.cpp
new file mode 100644 (file)
index 0000000..06fefc2
--- /dev/null
+++ b/src/type3_AndroidCloud/anbox-master/src/anbox/common/loop_device_allocator.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2017 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/common/loop_device_allocator.h"
+#include "anbox/common/loop_device.h"
+#include "anbox/defer_action.h"
+#include "anbox/utils.h"
+
+#include <boost/filesystem.hpp>
+
+#include <linux/loop.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include <system_error>
+
+namespace fs = boost::filesystem;
+
+namespace {
+const constexpr char *loop_control_path{"/dev/loop-control"};
+const constexpr char *base_loop_path{"/dev/loop"};
+}
+
+namespace anbox {
+namespace common {
+std::shared_ptr<LoopDevice> LoopDeviceAllocator::new_device() {
+  const auto ctl_fd = ::open(loop_control_path, O_RDWR);
+  if (ctl_fd < 0)
+    throw std::system_error{errno, std::system_category()};
+
+  DeferAction close_ctl_fd{[&]() { ::close(ctl_fd); }};
+
+  const auto device_nr = ::ioctl(ctl_fd, LOOP_CTL_GET_FREE);
+  if (device_nr < 0)
+    throw std::system_error{errno, std::system_category()};
+
+  return LoopDevice::create(utils::string_format("%s%d", base_loop_path, device_nr));
+}
+} // namespace common
+} // namespace anbox