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dm: flush the input/output during tty open.

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Discard the input/output data when open tty file. To avoid the
mevent callback is triggered immediately when the fd is added to
epoll.

Also update the uart_drain only read the data from tty file when
fifo has available space.

Tracked-On: #2159
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Yin Fengwei 2018-12-20 17:41:59 +08:00 committed by wenlingz
parent 88a7d8b2cc
commit f6ae835137
1 changed files with 4 additions and 2 deletions
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6
devicemodel/hw/uart_core.c
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@ -134,6 +134,7 @@ ttyopen(struct ttyfd *tf)
tf->tio_new = tf->tio_orig;
cfmakeraw(&tf->tio_new);
tf->tio_new.c_cflag |= CLOCAL;
tcflush(tf->fd_in, TCIOFLUSH);
tcsetattr(tf->fd_in, TCSANOW, &tf->tio_new);
if (tf->fd_in == STDIN_FILENO) {
@ -396,9 +397,10 @@ uart_drain(int fd, enum ev_type ev, void *arg)
if ((uart->mcr & MCR_LOOPBACK) != 0) {
(void) ttyread(&uart->tty);
} else {
while ((ch = ttyread(&uart->tty)) != -1)
/* only read tty when rxfifo available to make sure no data lost */
while (rxfifo_available(uart) && (ch = ttyread(&uart->tty)) != -1) {
rxfifo_putchar(uart, ch);
}
uart_toggle_intr(uart);
}