support cputime clocks for processes/threads other than self

[musl] / src / time / clock_getcpuclockid.c

#include <time.h>
#include <errno.h>
#include <unistd.h>
#include "syscall.h"

int clock_getcpuclockid(pid_t pid, clockid_t *clk)
{
        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;
}