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test: twister: add more exception protection

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the ser.in_wait sometime meet issue like serial handler error.
This is because the serial port is in reset status.
add final protection to retry later

error log:

Traceback (most recent call last):
  File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "zephyr/scripts/pylib/twister/twisterlib/handlers.py", line 345,
    in monitor_serial
    if not ser.in_waiting:
  File "~/python3.10/site-packages/serial/serialposix.py", line 549,
     in in_waiting
    s = fcntl.ioctl(self.fd, TIOCINQ, TIOCM_zero_str)
OSError: [Errno 9] Bad file descriptor

Signed-off-by: Hake Huang <hake.huang@oss.nxp.com>
This commit is contained in:
Hake Huang 2022-11-15 11:34:05 +08:00 • committed by Carles Cufí
commit 70553a64a3
1 changed files with 10 additions and 3 deletions
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13
scripts/pylib/twister/twisterlib/handlers.py
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@ -341,9 +341,16 @@ class DeviceHandler(Handler):
ser.close()
break
if not ser.in_waiting:
# no incoming bytes are waiting to be read from the serial
# input buffer, let other threads run
try:
if not ser.in_waiting:
# no incoming bytes are waiting to be read from
# the serial input buffer, let other threads run
time.sleep(0.001)
continue
# maybe the serial port is still in reset
# check status may cause error
# wait for more time
except OSError:
time.sleep(0.001)
continue