fstatvfs
HX(fstatvfs(0, &stvfs) == -1,
HX(fstatvfs(0, &stvfs) == -1,
HX(fstatvfs(0, &stvfs) == -1,
HX(fstatvfs(0, &stvfs) == -1,
HX(fstatvfs(0, &stvfs) == -1,
int fstatvfs(int, struct statvfs *);
if (fstatvfs(fd, &st) != 0)
if (fstatvfs(fd, &fs) == -1)