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.
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.
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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 
ProcessImpl()43     private ProcessImpl() {}    // Not instantiable
44 
toCString(String s)45     private static byte[] toCString(String s) {
46         if (s == null)
47             return null;
48         byte[] bytes = s.getBytes();
49         byte[] result = new byte[bytes.length + 1];
50         System.arraycopy(bytes, 0,
51                          result, 0,
52                          bytes.length);
53         result[result.length-1] = (byte)0;
54         return result;
55     }
56 
57     // Only for use by ProcessBuilder.start()
start(String[] cmdarray, java.util.Map<String,String> environment, String dir, ProcessBuilder.Redirect[] redirects, boolean redirectErrorStream)58     static Process start(String[] cmdarray,
59                          java.util.Map<String,String> environment,
60                          String dir,
61                          ProcessBuilder.Redirect[] redirects,
62                          boolean redirectErrorStream)
63         throws IOException
64     {
65         assert cmdarray != null && cmdarray.length > 0;
66 
67         // Convert arguments to a contiguous block; it's easier to do
68         // memory management in Java than in C.
69         byte[][] args = new byte[cmdarray.length-1][];
70         int size = args.length; // For added NUL bytes
71         for (int i = 0; i < args.length; i++) {
72             args[i] = cmdarray[i+1].getBytes();
73             size += args[i].length;
74         }
75         byte[] argBlock = new byte[size];
76         int i = 0;
77         for (byte[] arg : args) {
78             System.arraycopy(arg, 0, argBlock, i, arg.length);
79             i += arg.length + 1;
80             // No need to write NUL bytes explicitly
81         }
82 
83         int[] envc = new int[1];
84         byte[] envBlock = ProcessEnvironment.toEnvironmentBlock(environment, envc);
85 
86         int[] std_fds;
87 
88         FileInputStream  f0 = null;
89         FileOutputStream f1 = null;
90         FileOutputStream f2 = null;
91 
92         try {
93             if (redirects == null) {
94                 std_fds = new int[] { -1, -1, -1 };
95             } else {
96                 std_fds = new int[3];
97 
98                 if (redirects[0] == Redirect.PIPE)
99                     std_fds[0] = -1;
100                 else if (redirects[0] == Redirect.INHERIT)
101                     std_fds[0] = 0;
102                 else {
103                     f0 = new FileInputStream(redirects[0].file());
104                     std_fds[0] = f0.getFD().getInt$();
105                 }
106 
107                 if (redirects[1] == Redirect.PIPE)
108                     std_fds[1] = -1;
109                 else if (redirects[1] == Redirect.INHERIT)
110                     std_fds[1] = 1;
111                 else {
112                     f1 = new FileOutputStream(redirects[1].file(),
113                                               redirects[1].append());
114                     std_fds[1] = f1.getFD().getInt$();
115                 }
116 
117                 if (redirects[2] == Redirect.PIPE)
118                     std_fds[2] = -1;
119                 else if (redirects[2] == Redirect.INHERIT)
120                     std_fds[2] = 2;
121                 else {
122                     f2 = new FileOutputStream(redirects[2].file(),
123                                               redirects[2].append());
124                     std_fds[2] = f2.getFD().getInt$();
125                 }
126             }
127 
128         return new UNIXProcess
129             (toCString(cmdarray[0]),
130              argBlock, args.length,
131              envBlock, envc[0],
132              toCString(dir),
133                  std_fds,
134              redirectErrorStream);
135         } finally {
136             // In theory, close() can throw IOException
137             // (although it is rather unlikely to happen here)
138             try { if (f0 != null) f0.close(); }
139             finally {
140                 try { if (f1 != null) f1.close(); }
141                 finally { if (f2 != null) f2.close(); }
142             }
143         }
144     }
145 }
146