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* fhandler_serial.cc (raw_read): Evaluate minchars taking the

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vmin_ > ulen case into account.  Simplify evaluating the bytes to read.
	Don't use bytes in Queue value from ClearCommError call in case vtime_
	is > 0.  Reformat GetOverlappedResult call.  Simplify call to ReadFile.
This commit is contained in:
Corinna Vinschen
2006-08-17 14:51:48 +00:00
parent 0d8de89c9b
commit 30691bd756
2 changed files with 15 additions and 14 deletions
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7
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,10 @@
2006-08-17 Corinna Vinschen <corinna@vinschen.de>
* fhandler_serial.cc (raw_read): Evaluate minchars taking the
vmin_ > ulen case into account. Simplify evaluating the bytes to read.
Don't use bytes in Queue value from ClearCommError call in case vtime_
is > 0. Reformat GetOverlappedResult call. Simplify call to ReadFile.
2006-08-14 Corinna Vinschen <corinna@vinschen.de>
* security.cc (subauth): Initialize user_token to NULL. Add comment.

22
winsup/cygwin/fhandler_serial.cc
View File

@@ -44,7 +44,7 @@ fhandler_serial::raw_read (void *ptr, size_t& ulen)
int tot;
DWORD n;
HANDLE w4[2];
size_t minchars = vmin_ ?: ulen;
size_t minchars = vmin_ ? min (vmin_, ulen) : ulen;
w4[0] = io_status.hEvent;
w4[1] = signal_arrived;
@@ -60,25 +60,18 @@ fhandler_serial::raw_read (void *ptr, size_t& ulen)
for (n = 0, tot = 0; ulen; ulen -= n, ptr = (char *) ptr + n)
{
COMSTAT st;
DWORD inq = 1;
DWORD inq = vmin_ ? minchars : vtime_ ? ulen : 1;
n = 0;
if (!vtime_ && !vmin_)
inq = ulen;
else if (vtime_)
{
inq = ulen; // non-interruptible -- have to use kernel timeouts
// also note that this is not strictly correct.
// if vmin > ulen then things won't work right.
overlapped_armed = -1;
}
if (vtime_) // non-interruptible -- have to use kernel timeouts
overlapped_armed = -1;
if (!ClearCommError (get_handle (), &ev, &st))
goto err;
else if (ev)
termios_printf ("error detected %x", ev);
else if (st.cbInQue)
else if (st.cbInQue && !vtime_)
inq = st.cbInQue;
else if (!overlapped_armed)
{
@@ -98,7 +91,8 @@ fhandler_serial::raw_read (void *ptr, size_t& ulen)
switch (WaitForMultipleObjects (2, w4, FALSE, INFINITE))
{
case WAIT_OBJECT_0:
if (!GetOverlappedResult (get_handle (), &io_status, &n, FALSE))
if (!GetOverlappedResult (get_handle (), &io_status, &n,
FALSE))
goto err;
debug_printf ("n %d, ev %x", n, ev);
break;
@@ -119,7 +113,7 @@ fhandler_serial::raw_read (void *ptr, size_t& ulen)
if (inq > ulen)
inq = ulen;
debug_printf ("inq %d", inq);
if (ReadFile (get_handle (), ptr, min (inq, ulen), &n, &io_status))
if (ReadFile (get_handle (), ptr, inq, &n, &io_status))
/* Got something */;
else if (GetLastError () != ERROR_IO_PENDING)
goto err;