add C11 timespec_get function, with associated time.h changes for C11

[musl] / src / time / timespec_get.c

#include <time.h>

int __clock_gettime(clockid_t, struct timespec *);

/* There is no other implemented value than TIME_UTC; all other values
 * are considered erroneous. */
int timespec_get(struct timespec * ts, int base)
{
        if (base != TIME_UTC) return 0;
        int ret = __clock_gettime(CLOCK_REALTIME, ts);
        return ret < 0 ? 0 : base;
}