Re: Redirection to stderr
On Mon, July 10, 2017 12:33, Marco Atzeri wrote:
> On 10/07/2017 11:06, cygwin-mailinglist wrote:
>> Rationale aside, it is a bug, isn't it?
> I guess a side effect of a lost race.
Which race, exactly?
> Redirecting something on itself it is not guarantee to work.
I'm not sure it is on itself. Are these not two different streams?
When "some-cmd 2> /dev/stderr" is interpreted by the shell I would expect
that /dev/stderr points to a pipe or terminal *of that shell*. The fd 2 in
"2>", on the other hand, should be the standard error stream *of
some-cmd*. The redirection plugs the two together. Similar reasoning
applies to the outer layers of the redirection onion. Each process has a
/dev/stderr which stays (or, rather, should stay) valid until that process
ends. If there is a redirection, the inner process (e.g. some-cmd) must
not "free" or "delete" the pipe or whatever it is now attached to upon
exit; that stream belongs to the caller, e.g. the shell.
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