/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package sun.nio.ch;
// Constants for reporting I/O status
final class IOStatus {
private IOStatus() { }
static final int EOF = -1; // End of file
static final int UNAVAILABLE = -2; // Nothing available (non-blocking)
static final int INTERRUPTED = -3; // System call interrupted
static final int UNSUPPORTED = -4; // Operation not supported
static final int THROWN = -5; // Exception thrown in JNI code
static final int UNSUPPORTED_CASE = -6; // This case not supported
// The following two methods are for use in try/finally blocks where a
// status value needs to be normalized before being returned to the invoker
// but also checked for illegal negative values before the return
// completes, like so:
//
// int n = 0;
// try {
// begin();
// n = op(fd, buf, ...);
// return IOStatus.normalize(n); // Converts UNAVAILABLE to zero
// } finally {
// end(n > 0);
// assert IOStatus.check(n); // Checks other negative values
// }
//
static int normalize(int n) {
if (n == UNAVAILABLE)
return 0;
return n;
}
static boolean check(int n) {
return (n >= UNAVAILABLE);
}
static long normalize(long n) {
if (n == UNAVAILABLE)
return 0;
return n;
}
static boolean check(long n) {
return (n >= UNAVAILABLE);
}
// Return true iff n is not one of the IOStatus values
static boolean checkAll(long n) {
return ((n > EOF) || (n < UNSUPPORTED_CASE));
}
}