Cannot pipe frida-ps

[trufae]

$ frida-ps -U|head -n 1
 PID  Name
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.7.2_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/local/Cellar/python/3.7.2_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.7/site-packages/frida_tools/application.py", line 431, in _run
    work()
  File "/usr/local/lib/python3.7/site-packages/frida_tools/application.py", line 280, in _try_start
    self._start()
  File "/usr/local/lib/python3.7/site-packages/frida_tools/ps.py", line 69, in _start
    self._print(line_format % (process.pid, process.name))
  File "/usr/local/lib/python3.7/site-packages/frida_tools/application.py", line 346, in _print
    print(*encoded_args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/colorama/ansitowin32.py", line 41, in write
    self.__convertor.write(text)
  File "/usr/local/lib/python3.7/site-packages/colorama/ansitowin32.py", line 162, in write
    self.write_and_convert(text)
  File "/usr/local/lib/python3.7/site-packages/colorama/ansitowin32.py", line 190, in write_and_convert
    self.write_plain_text(text, cursor, len(text))
  File "/usr/local/lib/python3.7/site-packages/colorama/ansitowin32.py", line 196, in write_plain_text
    self.wrapped.flush()
BrokenPipeError: [Errno 32] Broken pipe
``

[otadmor]

Can you pipe with Grep and tell if it crashes?

[trufae]

Works with grep because grep waits until the stream is closed to process the output. application.py should add a try catch to handle this case imho. What do you think @oleavr ?

[oleavr]

@trufae I tried adding a try/catch there but it isn't enough, I suspect we need to fix the issue in colorama.

[otadmor]

Is there another crash with the try catch?
Maybe the self.wrapped should try catch on all methods?

[oleavr]

@otadmor I don't know the specifics, didn't have time to investigate.