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 java.io;
27
28 import java.util.ArrayList;
29 import java.util.List;
30
31 /**
32 * Instances of the file descriptor class serve as an opaque handle
33 * to the underlying machine-specific structure representing an
34 * open file, an open socket, or another source or sink of bytes.
35 * The main practical use for a file descriptor is to create a
36 * {@link FileInputStream} or {@link FileOutputStream} to contain it.
37 *
38 * <p>Applications should not create their own file descriptors.
39 *
40 * @author Pavani Diwanji
41 * @since 1.0
42 */
43 public final class FileDescriptor {
44
45 private int fd;
46
47 private long handle;
48
49 private Closeable parent;
53 /**
54 * true, if file is opened for appending.
55 */
56 private boolean append;
57
58 /**
59 * Constructs an (invalid) FileDescriptor
60 * object.
61 */
62 public /**/ FileDescriptor() {
63 fd = -1;
64 handle = -1;
65 }
66
67 static {
68 initIDs();
69 }
70
71 // Set up JavaIOFileDescriptorAccess in SharedSecrets
72 static {
73 sun.misc.SharedSecrets.setJavaIOFileDescriptorAccess(
74 new sun.misc.JavaIOFileDescriptorAccess() {
75 public void set(FileDescriptor obj, int fd) {
76 obj.fd = fd;
77 }
78
79 public int get(FileDescriptor obj) {
80 return obj.fd;
81 }
82
83 public void setAppend(FileDescriptor obj, boolean append) {
84 obj.append = append;
85 }
86
87 public boolean getAppend(FileDescriptor obj) {
88 return obj.append;
89 }
90
91 public void setHandle(FileDescriptor obj, long handle) {
92 obj.handle = handle;
93 }
94
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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 java.io;
27
28 import java.util.ArrayList;
29 import java.util.List;
30 import jdk.internal.misc.JavaIOFileDescriptorAccess;
31 import jdk.internal.misc.SharedSecrets;
32
33 /**
34 * Instances of the file descriptor class serve as an opaque handle
35 * to the underlying machine-specific structure representing an
36 * open file, an open socket, or another source or sink of bytes.
37 * The main practical use for a file descriptor is to create a
38 * {@link FileInputStream} or {@link FileOutputStream} to contain it.
39 *
40 * <p>Applications should not create their own file descriptors.
41 *
42 * @author Pavani Diwanji
43 * @since 1.0
44 */
45 public final class FileDescriptor {
46
47 private int fd;
48
49 private long handle;
50
51 private Closeable parent;
55 /**
56 * true, if file is opened for appending.
57 */
58 private boolean append;
59
60 /**
61 * Constructs an (invalid) FileDescriptor
62 * object.
63 */
64 public /**/ FileDescriptor() {
65 fd = -1;
66 handle = -1;
67 }
68
69 static {
70 initIDs();
71 }
72
73 // Set up JavaIOFileDescriptorAccess in SharedSecrets
74 static {
75 SharedSecrets.setJavaIOFileDescriptorAccess(
76 new JavaIOFileDescriptorAccess() {
77 public void set(FileDescriptor obj, int fd) {
78 obj.fd = fd;
79 }
80
81 public int get(FileDescriptor obj) {
82 return obj.fd;
83 }
84
85 public void setAppend(FileDescriptor obj, boolean append) {
86 obj.append = append;
87 }
88
89 public boolean getAppend(FileDescriptor obj) {
90 return obj.append;
91 }
92
93 public void setHandle(FileDescriptor obj, long handle) {
94 obj.handle = handle;
95 }
96
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