gdb/common/scoped_fd.h

   1 /* scoped_fd, automatically close a file descriptor
   2
   3    Copyright (C) 2018 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef SCOPED_FD_H
  21 #define SCOPED_FD_H
  22
  23 #include "config.h"
  24
  25 #ifdef HAVE_UNISTD_H
  26
  27 #include <unistd.h>
  28
  29 /* A smart-pointer-like class to automatically close a file descriptor.  */
  30
  31 class scoped_fd
  32 {
  33 public:
  34   explicit scoped_fd (int fd = -1) noexcept : m_fd (fd) {}
  35   ~scoped_fd ()
  36   {
  37     if (m_fd >= 0)
  38       close (m_fd);
  39   }
  40
  41   DISABLE_COPY_AND_ASSIGN (scoped_fd);
  42
  43   int release () noexcept
  44   {
  45     int fd = m_fd;
  46     m_fd = -1;
  47     return fd;
  48   }
  49
  50   int get () const noexcept
  51   {
  52     return m_fd;
  53   }
  54
  55 private:
  56   int m_fd;
  57 };
  58
  59 #endif /* HAVE_UNISTD_H */
  60 #endif /* SCOPED_FD_H */