1  /* close replacement.
       2     Copyright (C) 2008-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #include <config.h>
      18  
      19  /* Specification.  */
      20  #include <unistd.h>
      21  
      22  #include <errno.h>
      23  
      24  #include "fd-hook.h"
      25  #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
      26  # include "msvc-inval.h"
      27  #endif
      28  
      29  #undef close
      30  
      31  #if defined _WIN32 && !defined __CYGWIN__
      32  # if HAVE_MSVC_INVALID_PARAMETER_HANDLER
      33  static int
      34  close_nothrow (int fd)
      35  {
      36    int result;
      37  
      38    TRY_MSVC_INVAL
      39      {
      40        result = _close (fd);
      41      }
      42    CATCH_MSVC_INVAL
      43      {
      44        result = -1;
      45        errno = EBADF;
      46      }
      47    DONE_MSVC_INVAL;
      48  
      49    return result;
      50  }
      51  # else
      52  #  define close_nothrow _close
      53  # endif
      54  #else
      55  # define close_nothrow close
      56  #endif
      57  
      58  /* Override close() to call into other gnulib modules.  */
      59  
      60  int
      61  rpl_close (int fd)
      62  {
      63  #if WINDOWS_SOCKETS
      64    int retval = execute_all_close_hooks (close_nothrow, fd);
      65  #else
      66    int retval = close_nothrow (fd);
      67  #endif
      68  
      69  #if REPLACE_FCHDIR
      70    if (retval >= 0)
      71      _gl_unregister_fd (fd);
      72  #endif
      73  
      74    return retval;
      75  }