Getting returncode of a command executed with Popen through xterm

AmFreak at web.de AmFreak at web.de
Tue Oct 19 23:37:56 CEST 2010


Am 19.10.2010, 10:10 Uhr, schrieb Diez B. Roggisch <deets at web.de>:

> AmFreak at web.de writes:
>
>> Hi,
>>
>> i have a program that have to execute linux commands. I do it like this:
>>
>> retcode = Popen(["xterm", "-e", command],stdin=PIPE, stdout=PIPE,
>> stderr=PIPE)
>>
>> I have to use xterm because some commands need further input from the
>> user after they are executed.
>> But when i use xterm i can't get the returncode or the errormessage
>> from a command:
>>
>> print retcode.returncode				# always 0
>> print retcode.stderr.read()			# always empty
>> print retcode.stdout.read()			# always empty
>>
>> The same code works without xterm. As i understand it, if i use xterm
>> the retcode refers to the xterm window (process).
>> But is there a way i can get the returncode and errormessage of the
>> command i sent to xterm ?
>
> You could create a python-wrapper-script that will store the result and
> streams in files. Like this
>
>
> command = ["callwrapper", "--dest-key=<random_string>",  
> "the_real_command"]
> Popen(["xterm", "-e", command])
>
> The dest-key will be used to create files named <random_string>.status,
> <random_string>.stdout, <random_string>.stderr so that you can read from
> them afterwards.
>
> Diez


Thanks for the answer,

but i really don't know how to do it - i never wrote a wrapper, how do i  
get the status, stdout and stderr ?
Can you elaborate that further or do you maybe have a link that could help  
me ?



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