ST_NOWAIT
if (fstatvfs1(fd, &sfb, ST_NOWAIT) < 0)
if (fstatvfs1(fd, &sv, ST_NOWAIT) == -1)
if ((mnts = getmntinfo(&mntbuf, ST_NOWAIT)) == 0) {
n = getvfsstat(NULL, 0, ST_NOWAIT);
ST_NOWAIT);