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timer_create.2: Document CLOCK_BOOTTIME 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-11-21 14:41:59 +01:00
parent 5fe5d581c6
commit 39c97bde31
1 changed files with 15 additions and 3 deletions
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18
man2/timer_create.2
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@ -23,9 +23,6 @@
.\" the source, must acknowledge the copyright and authors of this work.
.\" %%%LICENSE_END
.\"
.\" FIXME Linux 2.6.39 adds CLOCK_BOOTTIME, which needs be documented
.\" Does this also affect timerfd_create()?
.\"
.\" FIXME Linux 3.0 adds CLOCK_BOOTTIME_ALARM and CLOCK_REALTIME_ALARM,
.\" which need be documented
.\" Does this also affect timerfd_create()?
@ -84,6 +81,21 @@ A clock that measures (user and system) CPU time consumed by
the calling thread.
.\" The CLOCK_MONOTONIC_RAW that was added in 2.6.28 can't be used
.\" to create a timer -- mtk, Feb 2009
.TP
.BR CLOCK_BOOTTIME " (Since Linux 2.6.39)"
.\" commit 70a08cca1227dc31c784ec930099a4417a06e7d0
Like
.BR CLOCK_MONOTONIC ,
this is a monotonically increasing clock.
However, whereas the
.BR CLOCK_MONOTONIC
clock does not measure the time while a system is suspended, the
.BR CLOCK_BOOTTIME
clock does include the time during which the system is suspended.
This is useful for applications that need to be suspend-aware.
.BR CLOCK_REALTIME
is not suitable for such applications, since that clock is affected
by discontinuous changes to the system clock.
.PP
As well as the above values,
.I clockid