1 files changed, 87 insertions, 0 deletions
diff --git a/gdbsupport/scoped_fd.h b/gdbsupport/scoped_fd.h
new file mode 100644
index 00000000000..f40ce8b0b50
--- /dev/null
+++ b/gdbsupport/scoped_fd.h
@@ -0,0 +1,87 @@
+/* scoped_fd, automatically close a file descriptor
+
+   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY 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/>.  */
+
+#ifndef COMMON_SCOPED_FD_H
+#define COMMON_SCOPED_FD_H
+
+#include <unistd.h>
+#include "filestuff.h"
+
+/* A smart-pointer-like class to automatically close a file descriptor.  */
+
+class scoped_fd
+{
+public:
+  explicit scoped_fd (int fd = -1) noexcept : m_fd (fd) {}
+
+  scoped_fd (scoped_fd &&other)
+    : m_fd (other.m_fd)
+  {
+    other.m_fd = -1;
+  }
+
+  ~scoped_fd ()
+  {
+    if (m_fd >= 0)
+      close (m_fd);
+  }
+
+  scoped_fd &operator= (scoped_fd &&other)
+  {
+    if (m_fd != other.m_fd)
+      {
+	if (m_fd >= 0)
+	  close (m_fd);
+	m_fd = other.m_fd;
+	other.m_fd = -1;
+      }
+    return *this;
+  }
+
+  DISABLE_COPY_AND_ASSIGN (scoped_fd);
+
+  ATTRIBUTE_UNUSED_RESULT int release () noexcept
+  {
+    int fd = m_fd;
+    m_fd = -1;
+    return fd;
+  }
+
+  /* Like release, but return a gdb_file_up that owns the file
+     descriptor.  On success, this scoped_fd will be released.  On
+     failure, return NULL and leave this scoped_fd in possession of
+     the fd.  */
+  gdb_file_up to_file (const char *mode) noexcept
+  {
+    gdb_file_up result (fdopen (m_fd, mode));
+    if (result != nullptr)
+      m_fd = -1;
+    return result;
+  }
+
+  int get () const noexcept
+  {
+    return m_fd;
+  }
+
+private:
+  int m_fd;
+};
+
+#endif /* COMMON_SCOPED_FD_H */