[musl] No such process return value in pthread_getcpuclockid

[Alexander Scherbatiy <alexander.scherbatiy@bell-sw.com>]

Hello,

It seems that pthread_getcpuclockid does not properly handle non valid 
thread id argument.

Below is a sample which calls pthread_getcpuclockid with NULL thread id. 
The expected result is ESRCH (No thread with the ID thread could be 
found). It crashes in my docker with Alpine Linux 3.11.3 (musl libc 
x86_64 1.1.24). It returns ESRCH on my Ubuntu system.

---  pthread_getcpuclockid_sample.c ---

#include <time.h>
#include <stdio.h>
#include <pthread.h>
#include <errno.h>


int main()
{
     clockid_t cid;
     int s;

     s = pthread_getcpuclockid((pthread_t) NULL, &cid);

     if (s == ESRCH) {
         printf("result: ESRCH\n");
     } else {
         printf("result: %d\n", s);
     }

     return 0;
}
--------------------------------------

 > gcc -pthread -o pthread_getcpuclockid_sample 
pthread_getcpuclockid_sample.c

 > ./pthread_getcpuclockid_sample

Segmentation fault (core dumped)


Thanks,

Alexander.