UNIXProcess.java.linux revision 25
1472N/A * Copyright 1995-2008 Sun Microsystems, Inc. All Rights Reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 0N/A * published by the Free Software Foundation. Sun designates this 0N/A * particular file as subject to the "Classpath" exception as provided 0N/A * by Sun in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 1472N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1472N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 0N/A * CA 95054 USA or visit www.sun.com if you need additional information or 0N/A * have any questions. 0N/A/* java.lang.Process subclass in the UNIX environment. 0N/A * @author Mario Wolczko and Ross Knippel. 0N/A * @author Konstantin Kladko (ported to Linux) 0N/A /* this is for the reaping thread */ 0N/A * Create a process using fork(2) and exec(2). 0N/A * @param std_fds array of file descriptors. Indexes 0, 1, and 0N/A * 2 correspond to standard input, standard output and 0N/A * standard error, respectively. On input, a value of -1 0N/A * means to create a pipe to connect child and parent 0N/A * processes. On output, a value which is not -1 is the 0N/A * parent pipe fd corresponding to the pipe which has 0N/A * been created. An element of this array is -1 on input 0N/A * if and only if it is <em>not</em> -1 on output. 0N/A * @return the pid of the subprocess 0N/A /* In the process constructor we wait on this gate until the process */ 0N/A /* has been created. Then we return from the constructor. */ 0N/A /* fork() is called by the same thread which later waits for the process */ 0N/A synchronized void exit() {
/* Opens the gate */ 0N/A * For each subprocess forked a corresponding reaper thread 0N/A * is started. That thread is the only thread which waits 0N/A * for the subprocess to terminate and it doesn't hold any 0N/A * locks while doing so. This design allows waitFor() and 0N/A * exitStatus() to be safely executed in parallel (and they 0N/A * need no native code). 0N/A // There is a risk that pid will be recycled, causing us to 0N/A // kill the wrong process! So we only terminate processes 0N/A // that appear to still be running. Even with this check, 0N/A // there is an unavoidable race condition here, but the window 0N/A // is very small, and OSes try hard to not recycle pids too 0N/A // soon, so this is quite safe. 0N/A synchronized (
this) {
0N/A /* This routine initializes JNI field offsets for the class */