Re: read with very small timeout sometime hand on stdin

[Chet Ramey]

On 10/28/20 7:06 AM, felix wrote:

> Bash Version: 5.1
> Patch Level: 0
> Release Status: rc1
> 
> Description:
>     Trying to see limits of timeout with `read -t`, I encounter strange
>     and unconstant result: sometime `read -t .000001` don't consider
>     timeout, when running fastly multiple time.

I can't reproduce this using the following stripped-down reproducer:

trap 'echo $f ; exit' SIGINT

for f in {1..10000}; do
        read -t .000001 v
        if [ $? -ne 142 ]; then
                echo $f: $?
        fi
done


>     Ok, then microsecond seem to by smallest value.

Yes, the smallest granularity is microseconds. The code uses interval
timers and timevals.

-- 
``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/