bug in dup2

[Eric Blake]

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POSIX requires dup2(1,1) to return 1 (if stdout is open), not 0.  I wonder
how long that bug has been present?  And the STC:

#include <unistd.h>
int main() { return dup2 (1, 1); }

2009-07-21  Eric Blake  <ebb9@byu.net>

	* dtable.cc (dup2): Correct return value for no-op.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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