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Re: Bizarre interaction bug involving bash w/ lastpipe + Almquist 'wait'
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From: |
Chet Ramey |
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Subject: |
Re: Bizarre interaction bug involving bash w/ lastpipe + Almquist 'wait' |
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Date: |
Fri, 7 Feb 2020 11:16:15 -0500 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.4.2 |
On 2/6/20 2:29 PM, Harald van Dijk wrote:
> On 06/02/2020 16:12, Martijn Dekker wrote:
>> When executing test.bash with dash, gwsh, Busybox ash, or FreeBSD sh,
>> then test.ash simply waits forever on executing 'wait "$!"'.
>
> Nice test. bash leaves the process in a state where SIGCHLD is blocked, and
> the various ash-based shells do not unblock it.
Thanks for the investigation. Bash does leave SIGCHLD blocked in this exact
set of circumstances (lastpipe+function+return at end of pipeline+exec).
--
``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/