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.*;
29 import java.nio.charset.Charset;
30 import sun.nio.cs.StreamDecoder;
31 import sun.nio.cs.StreamEncoder;
32
33 /**
34 * Methods to access the character-based console device, if any, associated
35 * with the current Java virtual machine.
36 *
37 * <p> Whether a virtual machine has a console is dependent upon the
38 * underlying platform and also upon the manner in which the virtual
39 * machine is invoked. If the virtual machine is started from an
40 * interactive command line without redirecting the standard input and
41 * output streams then its console will exist and will typically be
42 * connected to the keyboard and display from which the virtual machine
43 * was launched. If the virtual machine is started automatically, for
44 * example by a background job scheduler, then it will typically not
45 * have a console.
46 * <p>
47 * If this virtual machine has a console then it is represented by a
48 * unique instance of this class which can be obtained by invoking the
49 * {@link java.lang.System#console()} method. If no console device is
502 if (cbuf == rcb) {
503 cbuf = grow();
504 end = cbuf.length;
505 } else {
506 return off - offset;
507 }
508 }
509 }
510 if (eof)
511 return off - offset;
512 }
513 }
514 }
515 }
516
517 // Set up JavaIOAccess in SharedSecrets
518 static {
519 try {
520 // Add a shutdown hook to restore console's echo state should
521 // it be necessary.
522 sun.misc.SharedSecrets.getJavaLangAccess()
523 .registerShutdownHook(0 /* shutdown hook invocation order */,
524 false /* only register if shutdown is not in progress */,
525 new Runnable() {
526 public void run() {
527 try {
528 if (echoOff) {
529 echo(true);
530 }
531 } catch (IOException x) { }
532 }
533 });
534 } catch (IllegalStateException e) {
535 // shutdown is already in progress and console is first used
536 // by a shutdown hook
537 }
538
539 sun.misc.SharedSecrets.setJavaIOAccess(new sun.misc.JavaIOAccess() {
540 public Console console() {
541 if (istty()) {
542 if (cons == null)
543 cons = new Console();
544 return cons;
545 }
546 return null;
547 }
548
549 public Charset charset() {
550 // This method is called in sun.security.util.Password,
551 // cons already exists when this method is called
552 return cons.cs;
553 }
554 });
555 }
556 private static Console cons;
557 private native static boolean istty();
558 private Console() {
559 readLock = new Object();
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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.*;
29 import java.nio.charset.Charset;
30 import jdk.internal.misc.JavaIOAccess;
31 import jdk.internal.misc.SharedSecrets;
32 import sun.nio.cs.StreamDecoder;
33 import sun.nio.cs.StreamEncoder;
34
35 /**
36 * Methods to access the character-based console device, if any, associated
37 * with the current Java virtual machine.
38 *
39 * <p> Whether a virtual machine has a console is dependent upon the
40 * underlying platform and also upon the manner in which the virtual
41 * machine is invoked. If the virtual machine is started from an
42 * interactive command line without redirecting the standard input and
43 * output streams then its console will exist and will typically be
44 * connected to the keyboard and display from which the virtual machine
45 * was launched. If the virtual machine is started automatically, for
46 * example by a background job scheduler, then it will typically not
47 * have a console.
48 * <p>
49 * If this virtual machine has a console then it is represented by a
50 * unique instance of this class which can be obtained by invoking the
51 * {@link java.lang.System#console()} method. If no console device is
504 if (cbuf == rcb) {
505 cbuf = grow();
506 end = cbuf.length;
507 } else {
508 return off - offset;
509 }
510 }
511 }
512 if (eof)
513 return off - offset;
514 }
515 }
516 }
517 }
518
519 // Set up JavaIOAccess in SharedSecrets
520 static {
521 try {
522 // Add a shutdown hook to restore console's echo state should
523 // it be necessary.
524 SharedSecrets.getJavaLangAccess()
525 .registerShutdownHook(0 /* shutdown hook invocation order */,
526 false /* only register if shutdown is not in progress */,
527 new Runnable() {
528 public void run() {
529 try {
530 if (echoOff) {
531 echo(true);
532 }
533 } catch (IOException x) { }
534 }
535 });
536 } catch (IllegalStateException e) {
537 // shutdown is already in progress and console is first used
538 // by a shutdown hook
539 }
540
541 SharedSecrets.setJavaIOAccess(new JavaIOAccess() {
542 public Console console() {
543 if (istty()) {
544 if (cons == null)
545 cons = new Console();
546 return cons;
547 }
548 return null;
549 }
550
551 public Charset charset() {
552 // This method is called in sun.security.util.Password,
553 // cons already exists when this method is called
554 return cons.cs;
555 }
556 });
557 }
558 private static Console cons;
559 private native static boolean istty();
560 private Console() {
561 readLock = new Object();
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