in pathconf, -1, not 0, means unsupported.. syncio presumably works, too.
[musl] / src / linux / adjtimex.c
1 #include <sys/timex.h>
2 #include "syscall.h"
3
4 int adjtimex(struct timex *tx)
5 {
6         return syscall(SYS_adjtimex, tx);
7 }