/* Copyright (C) 2002 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details */
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <go32.h>
#include <dpmi.h>
#include <io.h>
#include <sys/fsext.h>
#include <libc/fsexthlp.h>
#include <libc/dosio.h>
#include <libc/fd_props.h>

int
_close(int handle)
{
  __dpmi_regs r = {0};

  __FSEXT_Function *func = __FSEXT_get_function(handle);
  if (func)
  {
    int rv;
    if (__FSEXT_func_wrapper(func, __FSEXT_close, &rv, handle))
    {
      /* So that we don't try to use it later!
	 The extension *should* do this itself! */
      __FSEXT_set_function(handle, 0);
      return rv;
    }
    /* same here */
    __FSEXT_set_function(handle, 0);
  }

  r.h.ah = 0x3e;
  r.x.bx = handle;
  __dpmi_int(0x21, &r);
  if (r.x.flags & 1)
  {
    errno = EBADF;
    return -1;
  }
  if (__has_fd_properties(handle))
    __clear_fd_properties(handle);
  return 0;
}