the code was untested.
I don't have time to look at this just now, but it's surely a problem with socketpair's args.
Start by changing
_pipe(*TO_CHLD_R, *TO_CHLD_W ) or die $!;
_pipe(*FR_CHLD_R, *FR_CHLD_W ) or die $!;
_pipe(*FR_CHLD_ERR_R, *FR_CHLD_ERR_W) or die $!;
_pipe(*TO_CHLD_R, *TO_CHLD_W ) or die $^E;
_pipe(*FR_CHLD_R, *FR_CHLD_W ) or die $^E;
_pipe(*FR_CHLD_ERR_R, *FR_CHLD_ERR_W) or die $^E;
to get a better error message.
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