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| -rw-r--r-- | man2/timerfd_create.2 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/man2/timerfd_create.2 b/man2/timerfd_create.2 index 066e0bee3a..63b8695898 100644 --- a/man2/timerfd_create.2 +++ b/man2/timerfd_create.2 @@ -317,6 +317,28 @@ 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 +If the associated clock is either +.BR CLOCK_REALTIME +or +.BR CLOCK_REALTIME_ALARM , +the timer is absolute +.RB ( TFD_TIMER_ABSTIME ), +and the flag +.BR TFD_TIMER_CANCEL_ON_SET +was +.I not +specified when calling +.BR timerfd_settime (), +then a discontinuous negative change to the clock (e.g., +.BR clock_settime (2)) +may cause +.BR read (2) +to unblock, but return a value of 0 (i.e., no bytes read), +if the clock change occurs after the time expired, +but before the +.BR read (2) +on the file descriptor. .TP .BR poll "(2), " select "(2) (and similar)" The file descriptor is readable |