Bug#429021: builtin echo command redirection misbehaves in detached scripts when terminal is closed

[Chet Ramey <chet.ramey@case.edu>]

Dmitry Potapov wrote:

> 
> Unfortunately, you are right. I did not foresee that some shells may use
> "dup2(open("file.txt"), fileno(stdout))". It is a dirty hack, which may
> cause some other problems. Frankly, I am a bit surprised that bash uses
> printf instead of write(2).  BTW, you cannot use 'printf' in signal
> handlers, so it seems that you cannot use 'echo' in trap commands too.

Luckily, neither of these things is true.

What's needed is a portable interface like BSD's fpurge(3).

Chet

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Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/