Andrew Morton 643a654540
[PATCH] select: fix returned timeval ...
With David Woodhouse <dwmw2@infradead.org >
select() presently has a habit of increasing the value of the user's
`timeout' argument on return.
We were writing back a timeout larger than the original. We _deliberately_
round up, since we know we must wait at _least_ as long as the caller asks
us to.
The patch adds a couple of helper functions for magnitude comparison of
timespecs and of timevals, and uses them to prevent the various poll and
select functions from returning a timeout which is larger than the one which
was passed in.
The patch also fixes a bug in compat_sys_pselect7(): it was adding the new
timeout value to the old one and was returning that. It should just return
the new timeout value.
(We have various handy timespec/timeval-to-from-nsec conversion functions in
time.h. But this code open-codes it all).
Cc: "David S. Miller" <davem@davemloft.net >
Cc: Andi Kleen <ak@muc.de >
Cc: Ulrich Drepper <drepper@redhat.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: george anzinger <george@mvista.com >
Signed-off-by: Andrew Morton <akpm@osdl.org >
Signed-off-by: Linus Torvalds <torvalds@osdl.org >
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