lib/close.c

/* close replacement.
   Copyright (C) 2008-2026 Free Software Foundation, Inc.

   This file is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   This file 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include <unistd.h>

#include <errno.h>

#include "fd-hook.h"
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
# include "msvc-inval.h"
#endif

#undef close

#if defined _WIN32 && !defined __CYGWIN__
# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
static int
close_nothrow (int fd)
{
  int result;

  TRY_MSVC_INVAL
    {
      result = _close (fd);
    }
  CATCH_MSVC_INVAL
    {
      result = -1;
      errno = EBADF;
    }
  DONE_MSVC_INVAL;

  return result;
}
# else
#  define close_nothrow _close
# endif
#else
# define close_nothrow close
#endif

/* Override close() to call into other gnulib modules.  */

int
rpl_close (int fd)
{
#if WINDOWS_SOCKETS
  int retval = execute_all_close_hooks (close_nothrow, fd);
#else
  int retval = close_nothrow (fd);
#endif

#if REPLACE_FCHDIR
  if (retval >= 0)
    _gl_unregister_fd (fd);
#endif

  return retval;
}