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support cputime clocks for processes/threads other than self

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apparently these features have been in Linux for a while now, so it
makes sense to support them. the bit twiddling seems utterly illogical
and wasteful, especially the negation, but that's how the kernel folks
chose to encode pids/tids into the clock id.
This commit is contained in:
Rich Felker 2013-06-08 11:36:41 -04:00
parent 0996faa3d7
commit ea200e38bd
2 changed files with 7 additions and 3 deletions
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3
src/thread/pthread_getcpuclockid.c
View File

@ -2,5 +2,6 @@
int pthread_getcpuclockid(pthread_t t, clockid_t *clockid)
{
return ENOSYS;
*clockid = (-t->tid-1)*8U + 6;
return 0;
}

7
src/time/clock_getcpuclockid.c
View File

@ -5,7 +5,10 @@
int clock_getcpuclockid(pid_t pid, clockid_t *clk)
{
if (pid && pid != getpid()) return EPERM;
*clk = CLOCK_PROCESS_CPUTIME_ID;
struct timespec ts;
clockid_t id = (-pid-1)*8U + 2;
int ret = __syscall(SYS_clock_getres, id, &ts);
if (ret) return -ret;
*clk = id;
return 0;
}