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Bug #2951

closed

clock_gettime always repots 0 sec, 0 nsec

Added by zhtw about 6 years ago. Updated over 3 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
09/16/2016
Due date:
% Done:

0%

Estimated time:

Description

When called with CLOCK_PROF, clock_gettime always returns 0 sec, 0 nsec:

$ uname -a
DragonFly kl.zta.lk 4.6-RELEASE DragonFly v4.6.0.10.g16fba-RELEASE #10: Wed Aug 17 14:26:31 CEST 2016 :/usr/obj/usr/src/sys/X86_64_GENERIC x86_64
$ cat time.c
#include <sys/time.h>
#include <stdio.h>

int main() {
struct timespec ts;
struct timespec *tp = &ts;

for (int i = 0; i != 1000000; ++i)
for (int j = 0; j != 1000; ++j)
;
int err = clock_gettime(CLOCK_PROF, tp);
printf("err: %d\n", err);
printf("sec: %ld\n", ts.tv_sec);
printf("nsec: %ld\n", ts.tv_nsec);
}
$ cc -pedantic -Wall time.c
$ ./a.out
err: 0
sec: 0
nsec: 0

The same program on a FreeBSD machine seems to work:
$ uname -a
FreeBSD fbsd 10.1-RELEASE FreeBSD 10.1-RELEASE #0 r274401: Tue Nov 11 21:02:49 UTC 2014 :/usr/obj/usr/src/sys/GENERIC amd64
$ cc -pedantic -Wall time.c
$ ./a.out
err: 0
sec: 1
nsec: 604478000

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