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32 .Nd duplicate an existing file descriptor
39 .Fn dup3 "int oldd" "int newd" "int flags"
44 duplicates an existing object descriptor
45 while allowing the value of the new descriptor to be specified.
47 The close-on-exec flag on the new file descriptor is determined by the
59 the behavior is identical to
60 .Li dup2(oldd, newd) .
71 The value -1 is returned if an error occurs.
74 indicates the cause of the error.
83 argument is not a valid active descriptor or the
85 argument is negative or exceeds the maximum allowable descriptor number
89 argument is equal to the
95 argument has bits set other than
103 .Xr getdtablesize 2 ,
111 function does not conform to any standard.