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https://bugzilla.redhat.com/show_bug.cgi?id=749167
--- Comment #3 from Petr Pisar ppisar@redhat.com 2011-10-26 10:30:51 EDT --- I see, the sentence
In the two-argument (and one-argument) form, one should replace dash ('-') with the command.
is just an example for one case. All cases are described in perlipc. Thank you.
So it should mkpipe(2) and fork(2) and dup(2) to read output of forked of itself. It seems there is not enough memory for fork.