That looks to me like a doc bug. I would guess it should read:

$SIG{PIPE} = sub { die "whoops, $program pipe broke" };

A broken pipe will generate a SIGPIPE signal when calling close().

--
3dan

In reply to Re: open(F, "|-") && SIG{ALRM} by edan
in thread open(F, "|-") && SIG{ALRM} by evilsheep

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