in pathconf, -1, not 0, means unsupported.. syncio presumably works, too.
[musl] / src / stdio / vscanf.c
1 #include <stdio.h>
2 #include <stdarg.h>
3
4 int vscanf(const char *fmt, va_list ap)
5 {
6         return vfscanf(stdin, fmt, ap);
7 }