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Re: implicit redirection of background within pipeline


From: Martin Kealey
Subject: Re: implicit redirection of background within pipeline
Date: Tue, 12 Jan 2016 07:29:43 +1100

Surely a pipe counts as an explicit redirection?

And even if it didn't, the inconsistency between the first and subsequent asynchronous elements is confusing.

On 12 Jan 2016 02:41, "Chet Ramey" <address@hidden> wrote:
On 1/10/16 12:54 PM, Piotr Grzybowski wrote:
> hey,
>
>  I am quite sure it happens here (devel branch, at
> 6f82653c5ef09aeeeba4376a1c65ce86c3605c00):
>
> execute_cmd.c +5115:
>    if ((cmdflags & CMD_STDIN_REDIR) &&
>   pipe_in == NO_PIPE &&
>   (stdin_redirects (redirects) == 0))
>      async_redirect_stdin ();
>
>  but after reading the comments some 3.5k lines earlier I am not sure
> how to fix it; of course commenting out the if in
> execute_cmd.c:5112-5115 solves it, but who can tell what it breaks?

Posix requires this behavior:

"The standard input for an asynchronous list, before any explicit
redirections are performed, shall be considered to be assigned to a file
that has the same properties as /dev/null."

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

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