[lug] Is there a way to get output once it's been redirected to /dev/null?

[Zan Lynx]

On 6/25/10 4:35 PM, Jonathan Corbet wrote:
> On Fri, 25 Jun 2010 16:30:27 -0600
> Jeffrey Haemer<jeffrey.haemer at gmail.com>  wrote:
>
>> Great idea, but I'm missing something.
>>
>> Here's the source for a sample program:
>>
>> #include<stdio.h>
>>
>> int main(void) {
>>    while (1) {
>>      printf("hello, world\n");
>>      sleep(1);
>>    }
>> }
>
> Either wait longer or put in an fflush(stdout); call.  My guess is that
> stdio is buffering the output into a nice bug chunk.

That is what I think too.

The C stdio functions look at the output on startup and if it's a 
terminal they default to line buffered. If it isn't a terminal then it 
is chunk buffered and that is either 4 or 8K, IIRC.


-- 
Zan Lynx
zlynx at acm.org

"Knowledge is Power.  Power Corrupts.  Study Hard.  Be Evil."