dup, dup2, dup3

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dup(2)	referred by	bpf(2) \| close(2freebsd) \| dup(2freebsd) \| dup2(2freebsd) \| epoll(7) \| errno(2freebsd) \| explain(1) \| explain(3) \| explain_dup(3) \| explain_dup2(3) \| explain_dup2_or_die(3) \| explain_dup_or_die(3) \| explain_lca2010(1) \| fcntl(2) \| fcntl(2freebsd) \| fd_copy(3) \| fd_move(3) \| flock(2) \| flock(2freebsd) \| getdtablesize(2freebsd)
dup(2)	refer to	close(2) \| fcntl(2) \| feature_test_macros(7) \| getrlimit(2) \| lseek(2) \| open(2) \| signal(7)