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serial: Shouldn't mangle pid when ISIG is changed

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Let's check ISIG flag directly instead

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I060f70eefc79b1c34aa11ed4071179d2ae5fa5ca
This commit is contained in:
Xiang Xiao 2020-09-24 18:11:44 +08:00 committed by David Sidrane
parent c6b51771f0
commit 650e18baa1
3 changed files with 22 additions and 32 deletions
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19
drivers/serial/serial.c
View File

@ -1362,20 +1362,12 @@ static int uart_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
/* Make the controlling terminal of the calling process */
case TIOCSCTTY:
{
/* Check if the ISIG flag is set in the termios c_lflag to enable
* this feature. This flag is set automatically for a serial console
* device.
*/
if ((dev->tc_lflag & ISIG) != 0)
{
/* Save the PID of the recipient of the SIGINT signal. */
dev->pid = (pid_t)arg;
DEBUGASSERT((unsigned long)(dev->pid) == arg);
}
}
break;
#endif
}
@ -1421,17 +1413,6 @@ static int uart_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
dev->tc_iflag = termiosp->c_iflag;
dev->tc_oflag = termiosp->c_oflag;
dev->tc_lflag = termiosp->c_lflag;
#if defined(CONFIG_TTY_SIGINT) || defined(CONFIG_TTY_SIGSTP)
/* If the ISIG flag has been cleared in c_lflag, then un-
* register the controlling terminal.
*/
if ((dev->tc_lflag & ISIG) == 0)
{
dev->pid = (pid_t)-1;
}
#endif
}
break;
}

6
drivers/serial/serial_dma.c
View File

@ -373,9 +373,11 @@ void uart_recvchars_done(FAR uart_dev_t *dev)
#if defined(CONFIG_TTY_SIGINT) || defined(CONFIG_TTY_SIGSTP)
int signo = 0;
/* Check if the SIGINT character is anywhere in the newly received DMA buffer. */
/* Check if the SIGINT character is anywhere in the newly received DMA
* buffer.
*/
if (dev->pid >= 0)
if (dev->pid >= 0 && (dev->tc_lflag & ISIG))
{
signo = uart_recvchars_signo(dev);
}

23
drivers/serial/serial_io.c
View File

@ -184,8 +184,8 @@ void uart_recvchars(FAR uart_dev_t *dev)
if (nbuffered >= watermark)
{
/* Let the lower level driver know that the watermark level has been
* crossed. It will probably activate RX flow control.
/* Let the lower level driver know that the watermark level has
* been crossed. It will probably activate RX flow control.
*/
if (uart_rxflowcontrol(dev, nbuffered, true))
@ -196,8 +196,9 @@ void uart_recvchars(FAR uart_dev_t *dev)
}
}
#else
/* Check if RX buffer is full and allow serial low-level driver to pause
* processing. This allows proper utilization of hardware flow control.
/* Check if RX buffer is full and allow serial low-level driver to
* pause processing. This allows proper utilization of hardware flow
* control.
*/
if (is_full)
@ -217,9 +218,12 @@ void uart_recvchars(FAR uart_dev_t *dev)
ch = uart_receive(dev, &status);
#ifdef CONFIG_TTY_SIGINT
/* Is this the special character that will generate the SIGINT signal? */
/* Is this the special character that will generate the SIGINT
* signal?
*/
if (dev->pid >= 0 && ch == CONFIG_TTY_SIGINT_CHAR)
if (dev->pid >= 0 && (dev->tc_lflag & ISIG) &&
ch == CONFIG_TTY_SIGINT_CHAR)
{
/* Yes.. note that the kill is needed and do not put the character
* into the Rx buffer. It should not be read as normal data.
@ -230,9 +234,12 @@ void uart_recvchars(FAR uart_dev_t *dev)
else
#endif
#ifdef CONFIG_TTY_SIGSTP
/* Is this the special character that will generate the SIGSTP signal? */
/* Is this the special character that will generate the SIGSTP
* signal?
*/
if (dev->pid >= 0 && ch == CONFIG_TTY_SIGSTP_CHAR)
if (dev->pid >= 0 && (dev->tc_lflag & ISIG) &&
ch == CONFIG_TTY_SIGSTP_CHAR)
{
#ifdef CONFIG_TTY_SIGINT
/* Give precedence to SIGINT */