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newlib-cygwin
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* fhandler_tty.cc (fhandler_tty_slave::read): Attempt #527 to properly 

implement VMIN/VTIME.
This commit is contained in:
Christopher Faylor 2002-10-16 04:54:08 +00:00
parent 6c6c3b90e9
commit 207daf0f11
2 changed files with 42 additions and 15 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2002-10-16 Christopher Faylor <cgf@redhat.com>
* fhandler_tty.cc (fhandler_tty_slave::read): Attempt #527 to properly
implement VMIN/VTIME.
2002-10-15 Christopher Faylor <cgf@redhat.com>
* shared.cc (open_shared): Revert to "old" method for shared memory

52
winsup/cygwin/fhandler_tty.cc
View File

@ -632,9 +632,8 @@ fhandler_tty_slave::write (const void *ptr, size_t len)
int __stdcall
fhandler_tty_slave::read (void *ptr, size_t len)
{
DWORD n;
int totalread = 0;
int vmin = INT_MAX;
int vmin = 0;
int vtime = 0; /* Initialized to prevent -Wuninitialized warning */
size_t readlen;
DWORD bytes_in_pipe;
@ -646,7 +645,9 @@ fhandler_tty_slave::read (void *ptr, size_t len)
termios_printf ("read(%x, %d) handle %p", ptr, len, get_handle ());
if (!(get_ttyp ()->ti.c_lflag & ICANON))
if ((get_ttyp ()->ti.c_lflag & ICANON))
time_to_wait = INFINITE;
else
{
vmin = get_ttyp ()->ti.c_cc[VMIN];
if (vmin > INP_BUFFER_SIZE)
@ -656,17 +657,29 @@ fhandler_tty_slave::read (void *ptr, size_t len)
vmin = 0;
if (vtime < 0)
vtime = 0;
time_to_wait = vtime == 0 ? INFINITE : 100 * vtime;
if (!vmin && !vtime)
time_to_wait = 0;
else
time_to_wait = !vtime ? INFINITE : 100 * vtime;
}
else
time_to_wait = INFINITE;
w4[0] = signal_arrived;
w4[1] = input_available_event;
DWORD waiter = INFINITE;
while (len)
{
rc = WaitForMultipleObjects (2, w4, FALSE, time_to_wait);
rc = WaitForMultipleObjects (2, w4, FALSE, waiter);
if (rc == WAIT_TIMEOUT)
break;
if (rc == WAIT_FAILED)
{
termios_printf ("wait for input event failed, %E");
break;
}
if (rc == WAIT_OBJECT_0)
{
/* if we've received signal after successfully reading some data,
@ -676,13 +689,7 @@ fhandler_tty_slave::read (void *ptr, size_t len)
set_sig_errno (EINTR);
return -1;
}
else if (rc == WAIT_FAILED)
{
termios_printf ("wait for input event failed, %E");
break;
}
else if (rc == WAIT_TIMEOUT)
break;
rc = WaitForSingleObject (input_mutex, 1000);
if (rc == WAIT_FAILED)
{
@ -700,7 +707,19 @@ fhandler_tty_slave::read (void *ptr, size_t len)
_raise (SIGHUP);
bytes_in_pipe = 0;
}
if (!vmin && !time_to_wait)
{
ReleaseMutex (input_mutex);
return bytes_in_pipe;
}
readlen = min (bytes_in_pipe, min (len, sizeof (buf)));
if (vmin && readlen > (unsigned) vmin)
readlen = vmin;
DWORD n = 0;
if (readlen)
{
termios_printf ("reading %d bytes (vtime %d)", readlen, vtime);
@ -746,7 +765,7 @@ fhandler_tty_slave::read (void *ptr, size_t len)
}
if (get_ttyp ()->ti.c_lflag & ICANON || is_nonblocking ())
break;
if (totalread >= vmin && (vmin > 0 || totalread > 0))
if (vmin && totalread >= vmin)
break;
/* vmin == 0 && vtime == 0:
@ -766,6 +785,9 @@ fhandler_tty_slave::read (void *ptr, size_t len)
if (vmin == 0)
break;
if (n)
waiter = time_to_wait;
}
termios_printf ("%d=read(%x, %d)", totalread, ptr, len);
return totalread;