xiaoxiang781216 commented on code in PR #8483:
URL: https://github.com/apache/nuttx/pull/8483#discussion_r1106496663
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drivers/serial/serial.c:
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@@ -485,6 +489,87 @@ static int uart_tcdrain(FAR uart_dev_t *dev,
return ret;
}
+/****************************************************************************
+ * Name: uart_tcsendbreak
+ *
+ * Description:
+ * Request a serial line Break by calling the lower half driver's
+ * BSD-compatible Break IOCTLs TIOCSBRK and TIOCCBRK, with a sleep of the
+ * specified duration between them.
+ *
+ * Input Parameters:
+ * dev - Serial device.
+ * filep - Required for issuing lower half driver IOCTL call.
+ * ms - If non-zero, duration of the Break in milliseconds; if
+ * zero, duration is 400 milliseconds.
+ *
+ * Returned Value:
+ * 0 on success or a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+static int uart_tcsendbreak(FAR uart_dev_t *dev, FAR struct file *filep,
+ unsigned int ms)
+{
+ int ret;
+
+ /* tcsendbreak is a cancellation point */
+
+ if (enter_cancellation_point())
+ {
+#ifdef CONFIG_CANCELLATION_POINTS
Review Comment:
ok, let keep it mow.
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