Re: read reads from stale buffer after interrupt

[Chet Ramey]

On 5/28/24 1:53 AM, Oğuz wrote:
> See:
>
> $ while read; do :; done </dev/urandom
> ^C
> $ read </etc/os-release; declare -p REPLY
> declare -- 
> REPLY=$'\025\241\375%\232\317\002D\214\023\262\262B:\377\255&;\233\350\365\223\022'
> $ head -n 1 /etc/os-release
> PRETTY_NAME="Ubuntu 22.04.4 LTS"
>
> The line with ^C means I pressed Ctrl+C while the command above it is
> running. It may take a few tries.
>
> Calling zreset() from throw_to_top_level() seems to fix it but I
> didn't test much. This is reproducible on 5.2.26 too.

Thanks for the report. Since this occurs when read(2) returns a partial
buffer on an interrupt, I think we can handle it in read_builtin().

--
``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/

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