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sigaction.2: EWxpand description of si_utime and si_stime fields of siginfo_t 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2009-06-09 06:01:59 +02:00
parent f1a291ecd0
commit 45f2d4eb13
1 changed files with 17 additions and 2 deletions
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19
man2/sigaction.2
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@ -300,7 +300,22 @@ the timer; it is not the same as the timer ID returned by
.B SIGCHLD
fills in
.IR si_status ", " si_utime " and " si_stime .
.\" FIXME .
The
.I si_utime
and
.I si_stime
fields do not include the times used by waited for children (unlike
.BR getrusage (2)
and
.BR time (2).
In kernels up to 2.6, and since 2.6.27, these fields report
CPU time in units of
.IR sysconf(_SC_CLK_TCK) .
In 2.6 kernels before 2.6.27,
a bug meant that these fields reported time in units
of the (configurable) system jiffy (see
.BR time (7)).
\" FIXME .
.\" When si_utime and si_stime where originally implemented, the
.\" measurement unit was HZ, which was the same as clock ticks
.\" (sysconf(_SC_CLK_TCK)). In 2.6, HZ became configurable, and
@ -310,7 +325,7 @@ fills in
.\" USER_HZ instead, so that sysconf(_SC_CLK_TCK) could be used to
.\" convert to seconds. I have a queued patch to fix this:
.\" http://thread.gmane.org/gmane.linux.kernel/698061/ .
.\" Maybe it will make it into 2.6.27.
.\" This patch made it into 2.6.27.
.\" But note that these fields still don't return the times of
.\" waited for children (as is done by getrusage() and times()
.\" and wait4()). Solaris 8 does include child times.