Re: Defect in XSH open

[Paul Eggert <yyyyyy@xxxxxxxxxxx>]

yyyyyy@xxxxxxxxxxxxx writes:

> Are implementation added flags allowed to be added to the set of
> flags specified by the oflag argument to open() ? For example
> O_LARGEFILE
>
> No specific suggestion at this time. One approach could be to bound
> the possibilities with specific allowed values.

Can you give a few more details about this proposed approach?  It's
common practice for implementations to add values to the list, e.g.,
O_DIRECT, O_DIRECTORY, O_NOFOLLOW, and O_FSYNC for GNU/Linux, or
O_XATTR for Solaris, or O_LARGEFILE and O_NDELAY for both operating
systems.  Surely people aren't thinking of prohibiting extensions like
these.  But it's not clear what sort of restrictions are being
contemplated.