Re: bash closes fd twice.

[Mike Frysinger]

On 11 Dec 2015 07:06, Eric Blake wrote:
> On 12/11/2015 06:42 AM, Chet Ramey wrote:
> > On 12/11/15 12:40 AM, Yoriyuki Yamagata wrote:
> >> Dear list, 
> >>
> >> I found that bash tries to close the same fd twice, consecutively.  I’m 
> >> using Mac OS X Yosemite, and bash is the newest available (bash-master 
> >> from http://tiswww.case.edu/php/chet/bash/bashtop.html yesterday).
> > 
> > That's harmless.
> 
> Only if bash is single-threaded (it is) and if no signal handler can
> create fds (that, I'm less sure of).  It is absolutely harmful in a
> multi-threaded program, or in a program where a signal handler might
> open an fd and the signal can occur in the window between the two close()s.

what about loadable bash plugins ? :)
-mike

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