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PerlIO *
PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
...
#endif
}

     The object referenced by the descriptor does not distinguish betw
+een
     fildes and fildes2 in any way.  Thus if fildes2 and fildes are du
+plicate
...
     rate pointer into the file is desired, a different object referen
+ce to
     the file must be obtained by issuing an additional open(2) call. 
+ The
     close-on-exec flag on the new file descriptor is unset.