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Re: leaks fd for internal functions but not external command


From: Chet Ramey
Subject: Re: leaks fd for internal functions but not external command
Date: Tue, 23 Jul 2019 11:35:19 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 7/23/19 11:20 AM, Sam Liddicott wrote:
> 
> 
> On Tue, 23 Jul 2019 at 16:15, Sam Liddicott <address@hidden
> <mailto:address@hidden>> wrote:
> 
> 
> 
>     On Tue, 23 Jul 2019 at 16:13, Chet Ramey <address@hidden
>     <mailto:address@hidden>> wrote:
> 
>         On 7/23/19 11:11 AM, Sam Liddicott wrote:
> 
>         > The report concerns the different behaviour with internal and
>         external
>         > operations.
> 
>         Right. The close-on-exec is deliberate. That's how it was intended.
> 
> 
>     Doesn't close-on-exec usually takes effect only on the process that
>     does the exec?
>     i.e. the fork that does the exec, not the parent process?
> 
> 
> It got closed in the parent. The lsof is running for the parent, the main
> process. /bin/echo has quit before the lsof runs.

You mean case 2 in your original post? That's because redirections are
performed in the child process forked to run /bin/echo, so the fd never
exists in the parent process. I thought you were talking about case 1,
with the builtin echo.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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