static void
handle_error_fd (int error, gdb_client_data client_data)
{
serial *scb = (serial *) client_data;
ser_base_read_error_fd (scb, 0);
}
int
generic_readchar (struct serial *scb, int timeout,
int (do_readchar) (struct serial *scb, int timeout))
{
int ch;
if (scb->bufcnt > 0)
{
ch = *scb->bufp;
scb->bufcnt--;
scb->bufp++;
}
else if (scb->bufcnt < 0)
{
/* Some errors/eof are are sticky. */
ch = scb->bufcnt;
}
else
{
ch = do_readchar (scb, timeout);
if (ch < 0)
{
switch ((enum serial_rc) ch)
{
case SERIAL_EOF:
case SERIAL_ERROR:
/* Make the error/eof stick. */
scb->bufcnt = ch;
break;
case SERIAL_TIMEOUT:
scb->bufcnt = 0;
break;
}
}
}
/* Read any error output we might have. */
ser_base_read_error_fd (scb, 1);
reschedule (scb);
return ch;
}
static int
do_ser_base_readchar (struct serial *scb, int timeout)
{
int status;
int delta;
/* We have to be able to keep the GUI alive here, so we break the
original timeout into steps of 1 second, running the "keep the
GUI alive" hook each time through the loop.
Also, timeout = 0 means to poll, so we just set the delta to 0,
so we will only go through the loop once. */
delta = (timeout == 0 ? 0 : 1);
while (1)
{
/* N.B. The UI may destroy our world (for instance by calling
remote_stop,) in which case we want to get out of here as
quickly as possible. It is not safe to touch scb, since
someone else might have freed it. The
deprecated_ui_loop_hook signals that we should exit by
returning 1. */
if (deprecated_ui_loop_hook)
{
if (deprecated_ui_loop_hook (0))
return SERIAL_TIMEOUT;
}
status = ser_base_wait_for (scb, delta);
if (timeout > 0)
timeout -= delta;
/* If we got a character or an error back from wait_for, then we can
break from the loop before the timeout is completed. */
if (status != SERIAL_TIMEOUT)
break;
/* If we have exhausted the original timeout, then generate
a SERIAL_TIMEOUT, and pass it out of the loop. */
else if (timeout == 0)
{
status = SERIAL_TIMEOUT;
break;
}
/* We also need to check and consume the stderr because it could
come before the stdout for some stubs. If we just sit and wait
for stdout, we would hit a deadlock for that case. */
ser_base_read_error_fd (scb, 0);
}
if (status < 0)
return status;
status = scb->ops->read_prim (scb, BUFSIZ);
if (status <= 0)
{
if (status == 0)
return SERIAL_EOF;
else
/* Got an error from read. */
return SERIAL_ERROR;
}
scb->bufcnt = status;
scb->bufcnt--;
scb->bufp = scb->buf;
return *scb->bufp++;
}
