lib/close.c

   1 /* close replacement.
   2    Copyright (C) 2008-2021 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU 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 }