I guess calling freopen is better because cgo possibly having reference of 
stdin/stdout as FILE*.


On Thursday, August 4, 2016 at 8:07:40 PM UTC+9, Markus Zimmermann wrote:
>
> I feared that there would be no pure Go solution. Anyway, I used fdopen 
> variant the code is here 
> https://github.com/zimmski/osutil/blob/master/capture.go#L51 if anyone 
> every stumbles over this thread.
>
> Thanks for the help.
>
> On Monday, July 25, 2016 at 1:00:46 PM UTC+2, Uli Kunitz wrote:
>>
>> Your program doesn't work because changing os.Stdout and os.Stdin has no 
>> effect on stdio stdin and stdout. Stdio stdout will still reference fd 1 
>> and stderr fd 2.
>>  
>> I recommend following three solutions:
>>
>>
>>    1. The simplest approach could be not to use cgo at all and run the C 
>>    code in a separate process. Capturing the output of a separate process is 
>>    simple and can be done using the os/exec package.
>>    2. Reset stdin and stdout using fdopen in the C code. This could be 
>>    done permanently.
>>    3. Swap file descriptors using dup2.
>>
>>  
>>  
>>  
>>
>

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