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ProcessImpl.java
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147 lines (132 loc) · 4.27 KB
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/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.lang;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.lang.ProcessBuilder.Redirect;
import java.lang.ProcessBuilder.Redirect;
/**
* This class is for the exclusive use of ProcessBuilder.start() to
* create new processes.
*
* @author Martin Buchholz
* @since 1.5
*/
final class ProcessImpl {
private static final sun.misc.JavaIOFileDescriptorAccess fdAccess
= sun.misc.SharedSecrets.getJavaIOFileDescriptorAccess();
private ProcessImpl() {} // Not instantiable
private static byte[] toCString(String s) {
if (s == null)
return null;
byte[] bytes = s.getBytes();
byte[] result = new byte[bytes.length + 1];
System.arraycopy(bytes, 0,
result, 0,
bytes.length);
result[result.length-1] = (byte)0;
return result;
}
// Only for use by ProcessBuilder.start()
static Process start(String[] cmdarray,
java.util.Map<String,String> environment,
String dir,
ProcessBuilder.Redirect[] redirects,
boolean redirectErrorStream)
throws IOException
{
assert cmdarray != null && cmdarray.length > 0;
// Convert arguments to a contiguous block; it's easier to do
// memory management in Java than in C.
byte[][] args = new byte[cmdarray.length-1][];
int size = args.length; // For added NUL bytes
for (int i = 0; i < args.length; i++) {
args[i] = cmdarray[i+1].getBytes();
size += args[i].length;
}
byte[] argBlock = new byte[size];
int i = 0;
for (byte[] arg : args) {
System.arraycopy(arg, 0, argBlock, i, arg.length);
i += arg.length + 1;
// No need to write NUL bytes explicitly
}
int[] envc = new int[1];
byte[] envBlock = ProcessEnvironment.toEnvironmentBlock(environment, envc);
int[] std_fds;
FileInputStream f0 = null;
FileOutputStream f1 = null;
FileOutputStream f2 = null;
try {
if (redirects == null) {
std_fds = new int[] { -1, -1, -1 };
} else {
std_fds = new int[3];
if (redirects[0] == Redirect.PIPE)
std_fds[0] = -1;
else if (redirects[0] == Redirect.INHERIT)
std_fds[0] = 0;
else {
f0 = new FileInputStream(redirects[0].file());
std_fds[0] = fdAccess.get(f0.getFD());
}
if (redirects[1] == Redirect.PIPE)
std_fds[1] = -1;
else if (redirects[1] == Redirect.INHERIT)
std_fds[1] = 1;
else {
f1 = new FileOutputStream(redirects[1].file(),
redirects[1].append());
std_fds[1] = fdAccess.get(f1.getFD());
}
if (redirects[2] == Redirect.PIPE)
std_fds[2] = -1;
else if (redirects[2] == Redirect.INHERIT)
std_fds[2] = 2;
else {
f2 = new FileOutputStream(redirects[2].file(),
redirects[2].append());
std_fds[2] = fdAccess.get(f2.getFD());
}
}
return new UNIXProcess
(toCString(cmdarray[0]),
argBlock, args.length,
envBlock, envc[0],
toCString(dir),
std_fds,
redirectErrorStream);
} finally {
// In theory, close() can throw IOException
// (although it is rather unlikely to happen here)
try { if (f0 != null) f0.close(); }
finally {
try { if (f1 != null) f1.close(); }
finally { if (f2 != null) f2.close(); }
}
}
}
}