8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28
29 // Constants for reporting I/O status
30
31 public final class IOStatus {
32
33 private IOStatus() { }
34
35 public static final int EOF = -1; // End of file
36 public static final int UNAVAILABLE = -2; // Nothing available (non-blocking)
37 public static final int INTERRUPTED = -3; // System call interrupted
38 public static final int UNSUPPORTED = -4; // Operation not supported
39 public static final int THROWN = -5; // Exception thrown in JNI code
40 public static final int UNSUPPORTED_CASE = -6; // This case not supported
41
42 // The following two methods are for use in try/finally blocks where a
43 // status value needs to be normalized before being returned to the invoker
44 // but also checked for illegal negative values before the return
45 // completes, like so:
46 //
47 // int n = 0;
48 // try {
49 // begin();
50 // n = op(fd, buf, ...);
51 // return IOStatus.normalize(n); // Converts UNAVAILABLE to zero
52 // } finally {
53 // end(n > 0);
54 // assert IOStatus.check(n); // Checks other negative values
55 // }
56 //
57
58 public static int normalize(int n) {
59 if (n == UNAVAILABLE)
60 return 0;
|
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28 import java.lang.annotation.Native;
29
30 // Constants for reporting I/O status
31
32 public final class IOStatus {
33
34 private IOStatus() { }
35
36 @Native public static final int EOF = -1; // End of file
37 @Native public static final int UNAVAILABLE = -2; // Nothing available (non-blocking)
38 @Native public static final int INTERRUPTED = -3; // System call interrupted
39 @Native public static final int UNSUPPORTED = -4; // Operation not supported
40 @Native public static final int THROWN = -5; // Exception thrown in JNI code
41 @Native public static final int UNSUPPORTED_CASE = -6; // This case not supported
42
43 // The following two methods are for use in try/finally blocks where a
44 // status value needs to be normalized before being returned to the invoker
45 // but also checked for illegal negative values before the return
46 // completes, like so:
47 //
48 // int n = 0;
49 // try {
50 // begin();
51 // n = op(fd, buf, ...);
52 // return IOStatus.normalize(n); // Converts UNAVAILABLE to zero
53 // } finally {
54 // end(n > 0);
55 // assert IOStatus.check(n); // Checks other negative values
56 // }
57 //
58
59 public static int normalize(int n) {
60 if (n == UNAVAILABLE)
61 return 0;
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