From mboxrd@z Thu Jan  1 00:00:00 1970
From: dave@horsfall.org (Dave Horsfall)
Date: Sat, 23 Dec 2017 11:19:30 +1100 (EST)
Subject: [TUHS] SYSTEM V R1 HELP
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Message-ID: <alpine.BSF.2.21.1712231114230.27626@aneurin.horsfall.org>

On Fri, 22 Dec 2017, Random832 wrote:

> I've got it. The problem is with putc (actually _flsbuf), and it is 
> precisely *because* stderr is unbuffered.
>
> #define putc(x, p)	(--(p)->_cnt >= 0 ? \
> 			((int) (*(p)->_ptr++ = (unsigned char) (x))) : \
> 			_flsbuf((unsigned char) (x), (p)))

[...]

That, sir, is one brilliant piece of analysis; well done!  Of course, in 
hindsight it's bleedin' obvious :-)

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."