TYPE3

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

diff --git a/src/type3_AndroidCloud/anbox-master/src/anbox/common/loop_device.cpp b/src/type3_AndroidCloud/anbox-master/src/anbox/common/loop_device.cpp
new file mode 100644 (file)
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+++ b/src/type3_AndroidCloud/anbox-master/src/anbox/common/loop_device.cpp
@@ -0,0 +1,65 @@
+/*
+ * 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.h"
+#include "anbox/defer_action.h"
+
+#include <system_error>
+
+#include <linux/loop.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+namespace anbox {
+namespace common {
+std::shared_ptr<LoopDevice> LoopDevice::create(const boost::filesystem::path &path) {
+  const auto fd = ::open(path.c_str(), O_RDWR);
+  if (fd < 0)
+    throw std::system_error{errno, std::system_category()};
+
+  return std::shared_ptr<LoopDevice>(new LoopDevice(Fd{fd}, path));
+}
+
+LoopDevice::LoopDevice(Fd fd, const boost::filesystem::path &path) :
+  fd_{fd}, path_{path} {}
+
+LoopDevice::~LoopDevice() {
+  if (fd_ < 0)
+    return;
+
+  ::ioctl(fd_, LOOP_CLR_FD);
+  ::close(fd_);
+}
+
+bool LoopDevice::attach_file(const boost::filesystem::path &file_path) {
+  if (fd_ < 0)
+    return false;
+
+  int file_fd = ::open(file_path.c_str(), O_RDONLY);
+  if (file_fd < 0)
+    return false;
+
+  DeferAction close_file_fd{[&]() { ::close(file_fd); }};
+
+  if (::ioctl(fd_, LOOP_SET_FD, file_fd) < 0)
+    return false;
+
+  return true;
+}
+} // namespace common
+} // namespace anbox