vxworks获取硬盘剩余空间大小

#include <sys/param.h>
#include <sys/mount.h>
long long freeSpace() {
struct statfs buf;
long long freespace = -1;
if(statfs("/", &buf) >= 0){
freespace = (long long)buf.f_bsize * buf.f_bfree;
}

return freespace;
}