static void
_IO_unbuffer_all (void)
{
struct _IO_FILE *fp;
for (fp = (_IO_FILE *) _IO_list_all; fp; fp = fp->_chain)
{
if (! (fp->_flags & _IO_UNBUFFERED)
/* Iff stream is un-orientated, it wasn't used. */
&& fp->_mode != 0)
{
#ifdef _IO_MTSAFE_IO
int cnt;
#define MAXTRIES 2
for (cnt = 0; cnt < MAXTRIES; ++cnt)
if (fp->_lock == NULL || _IO_lock_trylock (*fp->_lock) == 0)
break;
else
/* Give the other thread time to finish up its use of the
stream. */
__sched_yield ();
#endif
if (! dealloc_buffers && !(fp->_flags & _IO_USER_BUF))
{
fp->_flags |= _IO_USER_BUF;
fp->_freeres_list = freeres_list;
freeres_list = fp;
fp->_freeres_buf = fp->_IO_buf_base;
}
_IO_SETBUF (fp, NULL, 0);
if (fp->_mode > 0)
_IO_wsetb (fp, NULL, NULL, 0);
#ifdef _IO_MTSAFE_IO
if (cnt < MAXTRIES && fp->_lock != NULL)
_IO_lock_unlock (*fp->_lock);
#endif
}
/* Make sure that never again the wide char functions can be
used. */
fp->_mode = -1;
}
}
int
_IO_setvbuf (_IO_FILE *fp, char *buf, int mode, _IO_size_t size)
{
int result;
CHECK_FILE (fp, EOF);
_IO_acquire_lock (fp);
switch (mode)
{
case _IOFBF:
fp->_IO_file_flags &= ~(_IO_LINE_BUF|_IO_UNBUFFERED);
if (buf == NULL)
{
if (fp->_IO_buf_base == NULL)
{
/* There is no flag to distinguish between "fully buffered
mode has been explicitly set" as opposed to "line
buffering has not been explicitly set". In both
cases, _IO_LINE_BUF is off. If this is a tty, and
_IO_filedoalloc later gets called, it cannot know if
it should set the _IO_LINE_BUF flag (because that is
the default), or not (because we have explicitly asked
for fully buffered mode). So we make sure a buffer
gets allocated now, and explicitly turn off line
buffering.
A possibly cleaner alternative would be to add an
extra flag, but then flags are a finite resource. */
if (_IO_DOALLOCATE (fp) < 0)
{
result = EOF;
goto unlock_return;
}
fp->_IO_file_flags &= ~_IO_LINE_BUF;
}
result = 0;
goto unlock_return;
}
break;
case _IOLBF:
fp->_IO_file_flags &= ~_IO_UNBUFFERED;
fp->_IO_file_flags |= _IO_LINE_BUF;
if (buf == NULL)
{
result = 0;
goto unlock_return;
}
break;
case _IONBF:
fp->_IO_file_flags &= ~_IO_LINE_BUF;
fp->_IO_file_flags |= _IO_UNBUFFERED;
buf = NULL;
size = 0;
break;
default:
result = EOF;
goto unlock_return;
}
result = _IO_SETBUF (fp, buf, size) == NULL ? EOF : 0;
unlock_return:
_IO_release_lock (fp);
return result;
}
