1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
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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
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package java.lang;
27 
28 import java.io.IOException;
29 import java.io.FileInputStream;
30 import java.io.FileOutputStream;
31 import java.lang.ProcessBuilder.Redirect;
32 import java.lang.ProcessBuilder.Redirect;
33 
34 /**
35  * This class is for the exclusive use of ProcessBuilder.start() to
36  * create new processes.
37  *
38  * @author Martin Buchholz
39  * @since   1.5
40  */
41 final class ProcessImpl {
42     // Android-changed: Use FileDescriptor.getInt$() instead of fdAccess.get(...).
43     // private static final sun.misc.JavaIOFileDescriptorAccess fdAccess
44     //     = sun.misc.SharedSecrets.getJavaIOFileDescriptorAccess();
45 
ProcessImpl()46     private ProcessImpl() {}    // Not instantiable
47 
toCString(String s)48     private static byte[] toCString(String s) {
49         if (s == null)
50             return null;
51         byte[] bytes = s.getBytes();
52         byte[] result = new byte[bytes.length + 1];
53         System.arraycopy(bytes, 0,
54                          result, 0,
55                          bytes.length);
56         result[result.length-1] = (byte)0;
57         return result;
58     }
59 
60     // Only for use by ProcessBuilder.start()
start(String[] cmdarray, java.util.Map<String,String> environment, String dir, ProcessBuilder.Redirect[] redirects, boolean redirectErrorStream)61     static Process start(String[] cmdarray,
62                          java.util.Map<String,String> environment,
63                          String dir,
64                          ProcessBuilder.Redirect[] redirects,
65                          boolean redirectErrorStream)
66         throws IOException
67     {
68         assert cmdarray != null && cmdarray.length > 0;
69 
70         // Convert arguments to a contiguous block; it's easier to do
71         // memory management in Java than in C.
72         byte[][] args = new byte[cmdarray.length-1][];
73         int size = args.length; // For added NUL bytes
74         for (int i = 0; i < args.length; i++) {
75             args[i] = cmdarray[i+1].getBytes();
76             size += args[i].length;
77         }
78         byte[] argBlock = new byte[size];
79         int i = 0;
80         for (byte[] arg : args) {
81             System.arraycopy(arg, 0, argBlock, i, arg.length);
82             i += arg.length + 1;
83             // No need to write NUL bytes explicitly
84         }
85 
86         int[] envc = new int[1];
87         byte[] envBlock = ProcessEnvironment.toEnvironmentBlock(environment, envc);
88 
89         int[] std_fds;
90 
91         FileInputStream  f0 = null;
92         FileOutputStream f1 = null;
93         FileOutputStream f2 = null;
94 
95         try {
96             if (redirects == null) {
97                 std_fds = new int[] { -1, -1, -1 };
98             } else {
99                 std_fds = new int[3];
100 
101                 if (redirects[0] == Redirect.PIPE)
102                     std_fds[0] = -1;
103                 else if (redirects[0] == Redirect.INHERIT)
104                     std_fds[0] = 0;
105                 else {
106                     f0 = new FileInputStream(redirects[0].file());
107                     // Android-changed: Use FileDescriptor.getInt$() instead of fdAccess.get(...).
108                     // std_fds[0] = fdAccess.get(f0.getFD());
109                     std_fds[0] = f0.getFD().getInt$();
110                 }
111 
112                 if (redirects[1] == Redirect.PIPE)
113                     std_fds[1] = -1;
114                 else if (redirects[1] == Redirect.INHERIT)
115                     std_fds[1] = 1;
116                 else {
117                     f1 = new FileOutputStream(redirects[1].file(),
118                                               redirects[1].append());
119                     // Android-changed: Use FileDescriptor.getInt$() instead of fdAccess.get(...).
120                     // std_fds[1] = fdAccess.get(f1.getFD());
121                     std_fds[1] = f1.getFD().getInt$();
122                 }
123 
124                 if (redirects[2] == Redirect.PIPE)
125                     std_fds[2] = -1;
126                 else if (redirects[2] == Redirect.INHERIT)
127                     std_fds[2] = 2;
128                 else {
129                     f2 = new FileOutputStream(redirects[2].file(),
130                                               redirects[2].append());
131                     // Android-changed: Use FileDescriptor.getInt$() instead of fdAccess.get(...).
132                     // std_fds[2] = fdAccess.get(f2.getFD());
133                     std_fds[2] = f2.getFD().getInt$();
134                 }
135             }
136 
137         return new UNIXProcess
138             (toCString(cmdarray[0]),
139              argBlock, args.length,
140              envBlock, envc[0],
141              toCString(dir),
142                  std_fds,
143              redirectErrorStream);
144         } finally {
145             // In theory, close() can throw IOException
146             // (although it is rather unlikely to happen here)
147             try { if (f0 != null) f0.close(); }
148             finally {
149                 try { if (f1 != null) f1.close(); }
150                 finally { if (f2 != null) f2.close(); }
151             }
152         }
153     }
154 }
155