diff options
| author | bde <bde@FreeBSD.org> | 2002-09-25 12:00:38 +0000 |
|---|---|---|
| committer | bde <bde@FreeBSD.org> | 2002-09-25 12:00:38 +0000 |
| commit | 23905c1c4617135e13d5c828d8bfb5ef751bcc4d (patch) | |
| tree | 693ec1e106c2d61eed07674e27b095379140b1bb /sys/kern | |
| parent | 1a47919de4c42db74ca895ddd0ccb59734cf95e1 (diff) | |
| download | FreeBSD-src-23905c1c4617135e13d5c828d8bfb5ef751bcc4d.zip FreeBSD-src-23905c1c4617135e13d5c828d8bfb5ef751bcc4d.tar.gz | |
Round up instead of towards 0 in clock_getres() so that a resolution of
0 is never returned.
PR: 41781
MFC after: 3 days
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/kern_time.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/kern/kern_time.c b/sys/kern/kern_time.c index 417a754..46645ea 100644 --- a/sys/kern/kern_time.c +++ b/sys/kern/kern_time.c @@ -214,7 +214,12 @@ clock_getres(struct thread *td, struct clock_getres_args *uap) error = 0; if (SCARG(uap, tp)) { ts.tv_sec = 0; - ts.tv_nsec = 1000000000 / tc_getfrequency(); + /* + * Round up the result of the division cheaply by adding 1. + * Rounding up is especially important if rounding down + * would give 0. Perfect rounding is unimportant. + */ + ts.tv_nsec = 1000000000 / tc_getfrequency() + 1; error = copyout(&ts, SCARG(uap, tp), sizeof(ts)); } return (error); |
