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Created attachment 431431[details]
testprogram
Description of problem:
Strace doesn't show when you call clock_gettime. If we compare this with our 5.4 machine where it shows.
Version-Release number of selected component (if applicable):
strace-4.5.19-1.5.el6.x86_64
How reproducible:
Always
Steps to Reproduce:
1. Program:
$ cat testclock.c
#include <time.h>
#include <stdio.h>
int main(void)
{
int intRet;
struct timespec res;
intRet = clock_gettime(CLOCK_REALTIME, &res);
}
2. gcc -o testclock -lrt testclock.c
3. strace ./testclock
Actual results:
A strace without any information about calling clock_gettime
Expected results:
Strace should get a result similair to the below (taken from a Red Hat Enterprise 5.4 environment):
clock_gettime(CLOCK_REALTIME, {1279021215, 132738000}) = 0
Additional info:
See attachment for the whole strace results.
There is no bug here. The clock_gettime call on x86_64 can now sometimes work via the kernel-supplied vDSO without making a syscall. strace can't trace the call into the vDSO, since it's just user-mode code (albeit kernel-supplied).
Created attachment 431431 [details] testprogram Description of problem: Strace doesn't show when you call clock_gettime. If we compare this with our 5.4 machine where it shows. Version-Release number of selected component (if applicable): strace-4.5.19-1.5.el6.x86_64 How reproducible: Always Steps to Reproduce: 1. Program: $ cat testclock.c #include <time.h> #include <stdio.h> int main(void) { int intRet; struct timespec res; intRet = clock_gettime(CLOCK_REALTIME, &res); } 2. gcc -o testclock -lrt testclock.c 3. strace ./testclock Actual results: A strace without any information about calling clock_gettime Expected results: Strace should get a result similair to the below (taken from a Red Hat Enterprise 5.4 environment): clock_gettime(CLOCK_REALTIME, {1279021215, 132738000}) = 0 Additional info: See attachment for the whole strace results.