[RFC] 9533: fourth iteration

[Paolo Carlini]

Hi again,

this is my current best proposal.
I don't think such kind of syntax:

  AC_DEFINE(_GLIBCPP_S_ISREG_OR_S_IFREG(m), (S_IFREG & (m)))

can really be used. Therefore I deal separately with the two cases
(i.e., S_ISREG and S_IFREG).

About ioctl, I haven't been able to find an example of a modern
system having it in <ioctl.h>, not in <sys/ioctl.h> or <sys/filio.h>,
therefore I'm relying on the code which I stolen from libjava:
seems to work well there for a variety of different platforms.

Paolo.

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