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.lang;
27
28 import java.io.*;
29 import java.util.concurrent.TimeUnit;
30
31 /* java.lang.Process subclass in the UNIX environment.
32 *
33 * @author Mario Wolczko and Ross Knippel.
34 */
35
36 final class UNIXProcess extends Process {
37 private static final sun.misc.JavaIOFileDescriptorAccess fdAccess
38 = sun.misc.SharedSecrets.getJavaIOFileDescriptorAccess();
39
40 private final int pid;
41 private int exitcode;
42 private boolean hasExited;
43
44 private OutputStream stdin_stream;
45 private InputStream stdout_stream;
46 private DeferredCloseInputStream stdout_inner_stream;
47 private InputStream stderr_stream;
48
49 /* this is for the reaping thread */
50 private native int waitForProcessExit(int pid);
51
52 /**
53 * Create a process using fork(2) and exec(2).
54 *
55 * @param std_fds array of file descriptors. Indexes 0, 1, and
56 * 2 correspond to standard input, standard output and
57 * standard error, respectively. On input, a value of -1
58 * means to create a pipe to connect child and parent
59 * processes. On output, a value which is not -1 is the
60 * parent pipe fd corresponding to the pipe which has
61 * been created. An element of this array is -1 on input
62 * if and only if it is <em>not</em> -1 on output.
63 * @return the pid of the subprocess
64 */
65 private native int forkAndExec(byte[] prog,
66 byte[] argBlock, int argc,
67 byte[] envBlock, int envc,
68 byte[] dir,
69 int[] std_fds,
70 boolean redirectErrorStream)
71 throws IOException;
72
73 UNIXProcess(final byte[] prog,
74 final byte[] argBlock, int argc,
75 final byte[] envBlock, int envc,
76 final byte[] dir,
77 final int[] std_fds,
78 final boolean redirectErrorStream)
79 throws IOException {
80 pid = forkAndExec(prog,
81 argBlock, argc,
82 envBlock, envc,
83 dir,
84 std_fds,
85 redirectErrorStream);
86
87 java.security.AccessController.doPrivileged(
88 new java.security.PrivilegedAction<Void>() { public Void run() {
89 if (std_fds[0] == -1)
90 stdin_stream = ProcessBuilder.NullOutputStream.INSTANCE;
91 else {
92 FileDescriptor stdin_fd = new FileDescriptor();
93 fdAccess.set(stdin_fd, std_fds[0]);
94 stdin_stream = new BufferedOutputStream(
95 new FileOutputStream(stdin_fd));
96 }
97
98 if (std_fds[1] == -1)
99 stdout_stream = ProcessBuilder.NullInputStream.INSTANCE;
100 else {
|
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.lang;
27
28 import java.io.*;
29 import java.util.concurrent.TimeUnit;
30 import java.security.AccessController;
31 import java.security.PrivilegedAction;
32
33 /* java.lang.Process subclass in the UNIX environment.
34 *
35 * @author Mario Wolczko and Ross Knippel.
36 */
37
38 final class UNIXProcess extends Process {
39 private static final sun.misc.JavaIOFileDescriptorAccess fdAccess
40 = sun.misc.SharedSecrets.getJavaIOFileDescriptorAccess();
41
42 private final int pid;
43 private int exitcode;
44 private boolean hasExited;
45
46 private OutputStream stdin_stream;
47 private InputStream stdout_stream;
48 private DeferredCloseInputStream stdout_inner_stream;
49 private InputStream stderr_stream;
50
51 private static String javahome;
52 private static String arch;
53 private static String helperpath;
54
55 enum LaunchMechanism {
56 CLONE(1), FORK(2),
57 VFORK(3), SPAWN(4);
58
59 private int value;
60 LaunchMechanism(int x) {value = x;}
61 };
62
63 /* On Solaris, the default is to spawn */
64 private static LaunchMechanism launchMechanism = LaunchMechanism.SPAWN;
65
66 static {
67 AccessController.doPrivileged(new PrivilegedAction<Void>() {
68 public Void run() {
69 String javahome = System.getProperty("java.home");
70 String osarch = System.getProperty("os.arch");
71 if (osarch.equals("x86")) {
72 osarch = "i386";
73 } else if (osarch.equals("x86_64")) {
74 osarch = "amd64";
75 }
76
77 helperpath = javahome + "/lib/" + osarch + "/jspawnhelper";
78 String s = System.getProperty("java.lang.useFork");
79 if (s != null) {
80 launchMechanism = LaunchMechanism.FORK;
81 }
82 return null;
83 }
84 });
85 }
86
87 /* this is for the reaping thread */
88 private native int waitForProcessExit(int pid);
89
90 /**
91 * Create a process. Depending on the mode flag, this is done by
92 * one of the following mechanisms.
93 * - fork(2) and exec(2)
94 * - vfork(2) and exec(2)
95 * - posix_spawn(2)
96 *
97 * @param std_fds array of file descriptors. Indexes 0, 1, and
98 * 2 correspond to standard input, standard output and
99 * standard error, respectively. On input, a value of -1
100 * means to create a pipe to connect child and parent
101 * processes. On output, a value which is not -1 is the
102 * parent pipe fd corresponding to the pipe which has
103 * been created. An element of this array is -1 on input
104 * if and only if it is <em>not</em> -1 on output.
105 * @return the pid of the subprocess
106 */
107 private native int forkAndExec(int mode, byte[] prog,
108 byte[] argBlock, int argc,
109 byte[] envBlock, int envc,
110 byte[] dir,
111 int[] std_fds,
112 boolean redirectErrorStream)
113 throws IOException;
114
115 UNIXProcess(final byte[] prog,
116 final byte[] argBlock, int argc,
117 final byte[] envBlock, int envc,
118 final byte[] dir,
119 final int[] std_fds,
120 final boolean redirectErrorStream)
121 throws IOException {
122 pid = forkAndExec(launchMechanism.value,
123 prog,
124 argBlock, argc,
125 envBlock, envc,
126 dir,
127 std_fds,
128 redirectErrorStream);
129
130 java.security.AccessController.doPrivileged(
131 new java.security.PrivilegedAction<Void>() { public Void run() {
132 if (std_fds[0] == -1)
133 stdin_stream = ProcessBuilder.NullOutputStream.INSTANCE;
134 else {
135 FileDescriptor stdin_fd = new FileDescriptor();
136 fdAccess.set(stdin_fd, std_fds[0]);
137 stdin_stream = new BufferedOutputStream(
138 new FileOutputStream(stdin_fd));
139 }
140
141 if (std_fds[1] == -1)
142 stdout_stream = ProcessBuilder.NullInputStream.INSTANCE;
143 else {
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