dup3 syscall - atomic set O_CLOEXEC with dup2

[Ed Schouten]

* Ed Schouten <ed at 80386.nl>, 20120112 10:56:
> I suspect that not long after we add dup3(), some random person asks us
> to implement F_DUP3FD. Any chance you can implement this without using a
> system call, but through fcntl()?

Never mind. This seems to be non-trivial, as fcntl() just takes a single
parameter and dup3() requires the newfd and the flags.

-- 
 Ed Schouten <ed at 80386.nl>
 WWW: http://80386.nl/
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