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* fhandler_serial.cc (fhandler_serial::tcflush): Simplify. Remove

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read polling loop to avoid a hang with streaming devices.
This commit is contained in:
Corinna Vinschen 2003-12-11 18:07:42 +00:00
parent 992406a5ea
commit 97cb9b9de4
2 changed files with 28 additions and 14 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2003-12-11 Brian Ford <ford@vss.fsi.com>
* fhandler_serial.cc (fhandler_serial::tcflush): Simplify. Remove
read polling loop to avoid a hang with streaming devices.
2003-12-11 Christopher Faylor <cgf@redhat.com>
* pinfo.cc (_pinfo::set_ctty): Correct stupid typo.

37
winsup/cygwin/fhandler_serial.cc
View File

@ -497,21 +497,30 @@ fhandler_serial::ioctl (unsigned int cmd, void *buffer)
int
fhandler_serial::tcflush (int queue)
{
if (queue == TCOFLUSH || queue == TCIOFLUSH)
PurgeComm (get_handle (), PURGE_TXABORT | PURGE_TXCLEAR);
DWORD flags;
if (queue == TCIFLUSH || queue == TCIOFLUSH)
/* Input flushing by polling until nothing turns up
(we stop after 1000 chars anyway) */
for (int max = 1000; max > 0; max--)
{
COMSTAT st;
if (!PurgeComm (get_handle (), PURGE_RXABORT | PURGE_RXCLEAR))
break;
low_priority_sleep (100);
if (!ClearCommError (get_handle (), &ev, &st) || !st.cbInQue)
break;
}
switch (queue)
{
case TCOFLUSH:
flags = PURGE_TXABORT | PURGE_TXCLEAR;
break;
case TCIFLUSH:
flags = PURGE_RXABORT | PURGE_RXCLEAR;
break;
case TCIOFLUSH:
flags = PURGE_TXABORT | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_RXCLEAR;
break;
default:
termios_printf ("Invalid tcflush queue %d", queue);
set_errno (EINVAL);
return -1;
}
if (!PurgeComm (get_handle (), flags))
{
__seterrno ();
return -1;
}
return 0;
}