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Re: [PATCH] Enable sub-second timeout in zsystem flock

On Mon, Jul 29, 2019 at 1:36 PM Cedric Ware
<cedric.ware__bml@xxxxxxxxxxxxxx> wrote:
>
> The attached patch (against zsh 5.7.1) modifies the bin_zsystem_flock()

In future, please either inline patches or attach them as text/plain
(e.g. with a ".txt" extension instead of ".patch").  Thanks!

> I kept the same function's logic of periodically retrying to acquire
> the lock in non-blocking mode.  However, there may be a better way to
> implement this timeout: set a timer such as setitimer(2) which sends
> a SIGALRM on timeout

Unfortunately that technique can't be used because ALRM is a signal
that the user is allowed to trap via the "trap" command or TRAPALRM
function, and which is controlled by the TMOUT variable which is also
user settable.
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