diff options
| -rw-r--r-- | nuttx/drivers/serial/serial.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/nuttx/drivers/serial/serial.c b/nuttx/drivers/serial/serial.c index 24744524f..28c657af0 100644 --- a/nuttx/drivers/serial/serial.c +++ b/nuttx/drivers/serial/serial.c @@ -660,9 +660,9 @@ static int uart_ioctl(FAR struct file *filep, int cmd, unsigned long arg) int ret = dev->ops->ioctl(filep, cmd, arg); - /* Append any higher level TTY flags */ + /* If the low-level handler didn't handle the call, see if we can handle it here */ - if (ret == OK) + if (ret == -ENOTTY) { switch (cmd) { @@ -686,6 +686,9 @@ static int uart_ioctl(FAR struct file *filep, int cmd, unsigned long arg) irqrestore(state); *(int *)arg = count; + ret = 0; + + break; } case FIONWRITE: @@ -695,7 +698,7 @@ static int uart_ioctl(FAR struct file *filep, int cmd, unsigned long arg) /* determine the number of bytes free in the buffer */ - if (dev->xmit.head <= dev->xmit.tail) + if (dev->xmit.head < dev->xmit.tail) { count = dev->xmit.tail - dev->xmit.head - 1; } @@ -707,8 +710,19 @@ static int uart_ioctl(FAR struct file *filep, int cmd, unsigned long arg) irqrestore(state); *(int *)arg = count; + ret = 0; + + break; } + } + } + /* Append any higher level TTY flags */ + + else if (ret == OK) + { + switch (cmd) + { #ifdef CONFIG_SERIAL_TERMIOS case TCGETS: { |