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Re: My script makes a defunct subshell and sticks on read


From: Chet Ramey
Subject: Re: My script makes a defunct subshell and sticks on read
Date: Wed, 31 Jan 2018 10:39:53 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

On 1/31/18 7:44 AM, Øyvind Hvidsten wrote:
> Here. Now it's reading from stdin, and it locks up after a few seconds
> every time. No fifo's, pipes, non-standard file descriptors or anything.
> 
> bash -c 'for ((i=0; ; i++)); do (( i%100 )) || printf "%s\n" "$i"; read -t
> 0.00001; done'

This is definitely a signal issue. No matter how you check, if a signal
arrives between the check and the read, and all the signal handler is
allowed to do is to set a flag, the read will block.

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



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