Hello David,
By the way, looking at the comments to the last version of
the pselect()/ppoll()patch, I see that the treatment of
the timeout argument is made dependent on the personality.
http://marc.theaimsgroup.com/?l=linux-kernel&m=111883591220436&w=2
I'm not sure that this is a good idea; my reasons as follows:
1. POSIX made the behaviour of pselect() explicit -- the
timeout must not be modified. The idea was to avoid the
vagueness of the select() specification; it had to be vague
because of existing implementations. By contrast, there were
no pre-existing implementations when pselect() was specified.
(By the way, although one or two posts in the earlier thread
implied that pselect() has long/widely been present on
some systems, this is almost certainly not true. The only
systems where I believe it is currently implemented are two that
were recently Unix 03 certified: Solaris 10 and AIX (5.3?). I
know from doing quite a bit of checking that it is not present
as a kernel implementation on most (all?) other systems (even
though it was already described by POSIX.1g and Richard
Stevens 7 years ago))
I haven't tested Solaris 10 and AIX, but I think one can be
reasonably sure that they would conform to the letter of
POSIX law. Lacking any strong reason to the contrary,
Linux should (IMO) too (why gratuitously introduce
differences across implementations?).
2. The existing (non-atomic) glibc pselect() implementation
does not change the timeout argument.
Please consider making Linux pselect() conform to POSIX on this
point.
Cheers,
Michael
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