0N/A/*
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
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0N/A * You should have received a copy of the GNU General Public License version
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0N/A */
0N/A
0N/Apackage sun.nio.ch;
0N/A
0N/A
0N/A// Constants for reporting I/O status
0N/A
0N/Afinal class IOStatus {
0N/A
0N/A private IOStatus() { }
0N/A
0N/A static final int EOF = -1; // End of file
0N/A static final int UNAVAILABLE = -2; // Nothing available (non-blocking)
0N/A static final int INTERRUPTED = -3; // System call interrupted
0N/A static final int UNSUPPORTED = -4; // Operation not supported
0N/A static final int THROWN = -5; // Exception thrown in JNI code
0N/A static final int UNSUPPORTED_CASE = -6; // This case not supported
0N/A
0N/A // The following two methods are for use in try/finally blocks where a
0N/A // status value needs to be normalized before being returned to the invoker
0N/A // but also checked for illegal negative values before the return
0N/A // completes, like so:
0N/A //
0N/A // int n = 0;
0N/A // try {
0N/A // begin();
0N/A // n = op(fd, buf, ...);
0N/A // return IOStatus.normalize(n); // Converts UNAVAILABLE to zero
0N/A // } finally {
0N/A // end(n > 0);
0N/A // assert IOStatus.check(n); // Checks other negative values
0N/A // }
0N/A //
0N/A
0N/A static int normalize(int n) {
0N/A if (n == UNAVAILABLE)
0N/A return 0;
0N/A return n;
0N/A }
0N/A
0N/A static boolean check(int n) {
0N/A return (n >= UNAVAILABLE);
0N/A }
0N/A
0N/A static long normalize(long n) {
0N/A if (n == UNAVAILABLE)
0N/A return 0;
0N/A return n;
0N/A }
0N/A
0N/A static boolean check(long n) {
0N/A return (n >= UNAVAILABLE);
0N/A }
0N/A
0N/A // Return true iff n is not one of the IOStatus values
0N/A static boolean checkAll(long n) {
0N/A return ((n > EOF) || (n < UNSUPPORTED_CASE));
0N/A }
0N/A
0N/A}