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Re: bash closes fd twice.
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From: |
Eric Blake |
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Subject: |
Re: bash closes fd twice. |
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Date: |
Fri, 11 Dec 2015 07:06:48 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
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.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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