Re: bash-5.1.16 fails to unlink named pipes if pipeline terminates prematurely

[Chet Ramey]

On 9/12/22 5:52 PM, RVP wrote:
> On Fri, 9 Sep 2022, Chet Ramey wrote:
>
> > Bash is out of the picture by the time the diff command dies due to
> > SIGPIPE. It performs word expansions, including process substitution,
> > and execs diff. It's no longer around to remove the named pipes.
>
> Without the `| head' to provoke a SIGPIPE, the named pipes are removed.

It's not the SIGPIPE per se; the bash fatal signal handler removes existing
named pipes when it dies due to SIGPIPE.

In the pipeline case, bash optimizes away the fork for the `diff' and just
executes it. When the SIGPIPE comes, bash is out of the picture.

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