[OT]-ish: Can someone explain this?

[Randy J. Ray]

On 07/02/2011 10:04 AM, Andrew Suffield wrote:
> On Sat, Jul 02, 2011 at 05:32:38PM +0100, Dirk Koopman wrote:
>> But how come I get output at a shell prompt, and not down a pipe (or
>> a redirection either)? What special magic is occurring here?
>
> If:
>
> 1. isatty() is true on the underlying fd of the FILE*
>
> and:
>
> 2. The string contains \n
>
> then printf calls fflush().
>
> In your first instance, stdout was your terminal, and in the second it
> was one end of a pipe.

That was my first thought, but I wasn't 100% sure. Glad to see I was right, and 
haven't *completely* forgotten my C minutiae...

Randy
-- 
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Randy J. Ray      Sunnyvale, CA      http://www.rjray.org   rjray at blackperl.com
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