Re: "read -s -n999 -t0.01 key" hangs until keypress

[Koichi Murase]

2023年10月12日(木) 19:18 Bodo Thiesen <bug-bash@bothie.de>:
> Tested versions:
>         bash-5.1.16 with readline 8.1.2
>         bash-5.2.15 with readline 8.2.1

You are using Bash 5.1, but I think it should have been already fixed
in Bash 5.2. There were similar reports [1-3] (you may compare the
test cases found there with yours):

[1] https://lists.gnu.org/archive/html/bug-bash/2020-10/msg00095.html
[2] https://lists.gnu.org/archive/html/bug-bash/2021-02/msg00059.html
[3] https://lists.gnu.org/archive/html/bug-bash/2021-02/msg00084.html

Bash 5.1 and 5.2 use totally different implementations for the
timeouts. The (default) implementation has been switched by [2] from
SIGALARM to select/pselect in Bash 5.2.


Koichi