ps output redirection problem [BUG, SOLVED]

[Ignacio García Pérez]

Luciano Miguel Ferreira Rocha escribió:

Ok. Mistery solved:

Have a look at the last line of format_process in procps/ps.c:

printf("%.*s\n", terminal_width, buffer);

The terminal_width variable gets initialized to INT_MAX when there is no 
terminal (which is the case when we are redirecting the output), and 
*for some reason, printf does not line such a huge value !!!*

I've verified that using 1000 instead of INT_MAX *solves the problem*, 
but doesn't look like a good solution. Perhaps the ps.c code maintainer 
could come up with a better solution.

> On Wed, Mar 28, 2007 at 12:22:30PM +0200, Ignacio García Pérez wrote:
>   
>> Luciano Miguel Ferreira Rocha escribió:
>>     
>>> On Wed, Mar 28, 2007 at 11:58:05AM +0200, Ignacio García Pérez wrote:
>>>  
>>>       
>>>> Hi,
>>>>
>>>> I just noticed that
>>>>
>>>> ps > out.txt
>>>>
>>>> ps 2>&1 > out.txt
>>>>
>>>> Produce an empty out.txt file. If no output redirection is used, the 
>>>> output of the ps command is as expected.
>>>>
>>>> Any idea of what's wrong?
>>>>    
>>>>         
>>> Are you using busybox statically linked to glibc?
>>>
>>>  
>>>       
>> I'm using busybox 1.4.2 dynamically linked to glibc.
>>     
>
> That clears glibc. What shell are you using?
>
> And could you please reply also to the list, to keep the discussion
> there?
>
>