Re: lib/45148: dup2(3) and dup3(3) should support EINVAL

[Martin Husemann <martin%duskware.de@localhost>]

On Fri, Jul 15, 2011 at 08:30:00AM +0000, Jukka Ruohonen wrote:
> In Linux the dup3(3) call fails with EINVAL (a) if the specified flags
> contain an invalid value or (b) if "newfd" equals "oldfd". The case (b)
> applies also to dup2(3).

I don't think so:

the open group base spec issue 7 says:

  If fildes2 is already a valid open file descriptor, it shall be closed
  first, unless fildes is equal to fildes2 in which case dup2() shall
  return fildes2 without closing it.

Our dup2(3) man page has weaker words, but to the same effect.

Martin