The Perl process essentially goes away by replacing itself when you exec. So, it might feel surprising but it seems sensible/intuitive that any FDs opened in Perl would close.

In reply to Re^3: Leaking a file descriptor into a child to use with /proc/self/fd/3 by Your Mother
in thread Leaking a file descriptor into a child to use with /proc/self/fd/3 by ewheeler

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