Hello Devi, On 3/18/20 3:04 PM, devi R.K wrote: > Added a return value 0 for timerfd_read which happens when there is a > bigger backward time drift*.* > > Signed-off-by: DEVI RK <devi.feb27@xxxxxxxxx> Can you say some more please about how you verified this and/or point me at the relevant kernel source code? At a simple attempt, I can't replicate the behavior you describe. Thanks, Michael > --- > man2/timerfd_create.2 | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/man2/timerfd_create.2 b/man2/timerfd_create.2 > index 066e0be..ccced98 100644 > --- a/man2/timerfd_create.2 > +++ b/man2/timerfd_create.2 > @@ -317,6 +317,10 @@ fails with the error > if the real-time clock undergoes a discontinuous change. > (This allows the reading application to discover > such discontinuous changes to the clock.) > +.IP > +A > +.BR read (2) > +may return 0 if the system clock undergoes a discontinuous change. > .TP > .BR poll "(2), " select "(2) (and similar)" > The file descriptor is readable > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
