public long read(ByteBuffer[] dsts) throws IOException {
if (dsts == null) throw new NullPointerException();
ensureOpen();
synchronized (lock) {
long n = 0;
try {
begin();
if (!isOpen()) return 0;
thread = NativeThread.current();
do {
n = IOUtil.read(fd, dsts, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
thread = 0;
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
}
}
