[bug #42390] fopen-fail fails on Debian GNU/Linux unstable

[Paul D. Smith]

Follow-up Comment #5, bug #42390 (project make):

There is already a way to choose a longer timeout: the run_make_test() method
takes an optional extra argument which is the timeout value.

I increased this to 300; hopefully that will solve this problem (I cannot
reproduce the original problem on my current Ubuntu GNOME system, which is
Debian-based of course: even with the original timeout I get the expected
failure).

I don't understand YunQiang's comment; the point of the test is to verify that
we get a non-zero error if we open too many file descriptors.  I don't know
why it should take so long to open more file descriptors than are valid for
the process.  Maybe a difference in the number of open file descriptors
allowed via ulimit -n is at play somehow here?  I've also added a step to the
check-regression rule (used by "make check") that sets ulimit -n 512 just in
case.  Of course this only works if you invoke the test suite through make,
not separately.  I couldn't find a portable way (without requiring extra
modules) of setting ulimit from within Perl itself.

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