dup, dup2

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dup(2freebsd)	referred by
dup(2freebsd)	refer to	accept(2) \| close(2) \| dup(2) \| fcntl(2) \| getdtablesize(2freebsd) \| lseek(2) \| open(2) \| pipe(2) \| read(2) \| socket(2) \| socketpair(2) \| write(2)