[perl #93428] potential race condition when mixing signals and select()

On Fri Jan 13 08:39:09 2012, nicholas wrote:
> Gah, and I suspect it's really hard, if not impossible, to probe for
> that.
> hints files?

To the contrary, it seems quite easy. Set a signal-handler (without the
SA_RESTART flag), block that signal, send it to the process and then do
a pselect unblocking that signal. If it's a real pselect, it will be
interrupted and thus return EINTR. If pselect is faked the signal will
arrive right after the sigprocmask (and thus before the select) so it
won't be interrupted. 

Leon

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https://rt.perl.org:443/rt3/Ticket/Display.html?id=93428

• [perl #93428] potential race condition when mixing signals and select() by Leon Timmermans via RT
• [perl #93428] potential race condition when mixing signals and select() by Leon Timmermans via RT
• Re: [perl #93428] potential race condition when mixing signals andselect() by Nicholas Clark
• Re: [perl #93428] potential race condition when mixing signals and select() by Leon Timmermans