mirror of git://gcc.gnu.org/git/gcc.git
410 lines
12 KiB
C
410 lines
12 KiB
C
/* java_lang_VMProcess.c -- native code for java.lang.VMProcess
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Copyright (C) 1998, 1999, 2000, 2002, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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#include <config.h>
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#include "java_lang_VMProcess.h"
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#include "gnu_java_nio_FileChannelImpl.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include "cpnative.h"
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#include "cpproc.h"
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/* Internal functions */
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static char *copy_string (JNIEnv * env, jobject string);
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static char *copy_elem (JNIEnv * env, jobject stringArray, jint i);
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/*
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* Internal helper function to copy a String in UTF-8 format.
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*/
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static char *
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copy_string (JNIEnv * env, jobject string)
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{
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const char *utf;
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jclass clazz;
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char *copy;
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/* Check for null */
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if (string == NULL)
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{
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clazz = (*env)->FindClass (env, "java/lang/NullPointerException");
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if ((*env)->ExceptionOccurred (env))
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return NULL;
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(*env)->ThrowNew (env, clazz, NULL);
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(*env)->DeleteLocalRef (env, clazz);
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return NULL;
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}
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/* Extract UTF-8 */
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utf = (*env)->GetStringUTFChars (env, string, NULL);
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if ((*env)->ExceptionOccurred (env))
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return NULL;
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/* Copy it */
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if ((copy = strdup (utf)) == NULL)
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{
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clazz = (*env)->FindClass (env, "java/lang/InternalError");
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if ((*env)->ExceptionOccurred (env))
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return NULL;
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(*env)->ThrowNew (env, clazz, "strdup returned NULL");
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(*env)->DeleteLocalRef (env, clazz);
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}
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/* Done */
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(*env)->ReleaseStringUTFChars (env, string, utf);
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return copy;
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}
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/*
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* Internal helper function to copy a String[] element in UTF-8 format.
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*/
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static char *
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copy_elem (JNIEnv * env, jobject stringArray, jint i)
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{
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jobject elem;
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char *rtn;
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elem = (*env)->GetObjectArrayElement (env, stringArray, i);
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if ((*env)->ExceptionOccurred (env))
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return NULL;
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if ((rtn = copy_string (env, elem)) == NULL)
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return NULL;
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(*env)->DeleteLocalRef (env, elem);
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return rtn;
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}
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/*
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* private final native void nativeSpawn(String[], String[], File)
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* throws java/io/IOException
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*/
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JNIEXPORT void JNICALL
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Java_java_lang_VMProcess_nativeSpawn (JNIEnv * env, jobject this,
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jobjectArray cmdArray,
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jobjectArray envArray, jobject dirFile,
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jboolean redirect)
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{
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int fds[CPIO_EXEC_NUM_PIPES];
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jobject streams[CPIO_EXEC_NUM_PIPES] = { NULL, NULL, NULL };
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jobject dirString = NULL;
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char **newEnviron = NULL;
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jsize cmdArrayLen = 0;
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jsize envArrayLen = 0;
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char **strings = NULL;
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int num_strings = 0;
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char *dir = NULL;
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pid_t pid = -1;
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char errbuf[64];
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jmethodID method, vmmethod;
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jclass clazz, vmclazz;
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int i;
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int pipe_count = redirect ? 2 : 3;
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int err;
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/* Check for null */
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if (cmdArray == NULL)
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goto null_pointer_exception;
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/* Invoke dirFile.getPath() */
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if (dirFile != NULL)
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{
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clazz = (*env)->FindClass (env, "java/io/File");
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if ((*env)->ExceptionOccurred (env))
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return;
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method = (*env)->GetMethodID (env,
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clazz, "getPath", "()Ljava/lang/String;");
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if ((*env)->ExceptionOccurred (env))
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return;
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dirString = (*env)->CallObjectMethod (env, dirFile, method);
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if ((*env)->ExceptionOccurred (env))
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return;
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(*env)->DeleteLocalRef (env, clazz);
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}
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/*
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* Allocate array of C strings. We put all the C strings we need to
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* handle the command parameters, the new environment, and the new
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* directory into a single array for simplicity of (de)allocation.
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*/
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cmdArrayLen = (*env)->GetArrayLength (env, cmdArray);
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if (cmdArrayLen == 0)
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goto null_pointer_exception;
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if (envArray != NULL)
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envArrayLen = (*env)->GetArrayLength (env, envArray);
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if ((strings = malloc (((cmdArrayLen + 1)
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+ (envArray != NULL ? envArrayLen + 1 : 0)
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+ (dirString !=
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NULL ? 1 : 0)) * sizeof (*strings))) == NULL)
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{
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strncpy (errbuf, "malloc failed", sizeof(errbuf));
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goto out_of_memory;
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}
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/* Extract C strings from the various String parameters */
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for (i = 0; i < cmdArrayLen; i++)
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{
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if ((strings[num_strings++] = copy_elem (env, cmdArray, i)) == NULL)
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goto done;
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}
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strings[num_strings++] = NULL; /* terminate array with NULL */
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if (envArray != NULL)
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{
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newEnviron = strings + num_strings;
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for (i = 0; i < envArrayLen; i++)
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{
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if ((strings[num_strings++] = copy_elem (env, envArray, i)) == NULL)
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goto done;
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}
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strings[num_strings++] = NULL; /* terminate array with NULL */
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}
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if (dirString != NULL)
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{
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if ((dir = copy_string (env, dirString)) == NULL)
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goto done;
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}
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/* Create inter-process pipes */
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err = cpproc_forkAndExec(strings, newEnviron, fds, pipe_count, &pid, dir);
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if (err != 0)
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{
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strncpy(errbuf, cpnative_getErrorString (err), sizeof(errbuf));
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goto system_error;
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}
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/* Create Input/OutputStream objects around parent file descriptors */
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vmclazz = (*env)->FindClass (env, "gnu/java/nio/VMChannel");
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clazz = (*env)->FindClass (env, "gnu/java/nio/FileChannelImpl");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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vmmethod = (*env)->GetMethodID (env, vmclazz, "<init>", "(I)V");
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method = (*env)->GetMethodID (env, clazz, "<init>", "(Lgnu/java/nio/VMChannel;I)V");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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for (i = 0; i < pipe_count; i++)
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{
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/* Mode is WRITE (2) for in and READ (1) for out and err. */
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const int fd = fds[i];
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const int mode = ((i == CPIO_EXEC_STDIN) ? 2 : 1);
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jclass sclazz;
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jmethodID smethod;
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jobject vmchannel;
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jobject channel;
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vmchannel = (*env)->NewObject (env, vmclazz, vmmethod, fd);
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if ((*env)->ExceptionOccurred (env))
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goto done;
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channel = (*env)->NewObject (env, clazz, method, vmchannel, mode);
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if ((*env)->ExceptionOccurred (env))
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goto done;
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if (mode == gnu_java_nio_FileChannelImpl_WRITE)
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sclazz = (*env)->FindClass (env, "java/io/FileOutputStream");
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else
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sclazz = (*env)->FindClass (env, "java/io/FileInputStream");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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smethod = (*env)->GetMethodID (env, sclazz, "<init>",
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"(Lgnu/java/nio/FileChannelImpl;)V");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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streams[i] = (*env)->NewObject (env, sclazz, smethod, channel);
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if ((*env)->ExceptionOccurred (env))
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goto done;
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(*env)->DeleteLocalRef (env, sclazz);
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}
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(*env)->DeleteLocalRef (env, clazz);
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/* Invoke VMProcess.setProcessInfo() to update VMProcess object */
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method = (*env)->GetMethodID (env,
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(*env)->GetObjectClass (env, this),
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"setProcessInfo",
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"(Ljava/io/OutputStream;Ljava/io/InputStream;Ljava/io/InputStream;J)V");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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(*env)->CallVoidMethod (env, this, method,
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streams[CPIO_EXEC_STDIN],
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streams[CPIO_EXEC_STDOUT],
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streams[CPIO_EXEC_STDERR],
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(jlong) pid);
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if ((*env)->ExceptionOccurred (env))
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goto done;
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done:
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/*
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* We get here in both the success and failure cases in the
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* parent process. Our goal is to clean up the mess we created.
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*/
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/*
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* Close parent's ends of pipes if Input/OutputStreams never got created.
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* This can only happen in a failure case. If a Stream object
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* was created for a file descriptor, we don't close it because it
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* will get closed when the Stream object is finalized.
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*/
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for (i = 0; i < pipe_count; i++)
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{
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const int fd = fds[i];
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if (fd != -1 && streams[i] == NULL)
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close (fd);
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}
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/* Free C strings */
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while (num_strings > 0)
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free (strings[--num_strings]);
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free (strings);
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if (dir != NULL)
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free(dir);
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/* Done */
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return;
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null_pointer_exception:
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clazz = (*env)->FindClass (env, "java/lang/NullPointerException");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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(*env)->ThrowNew (env, clazz, NULL);
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(*env)->DeleteLocalRef (env, clazz);
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goto done;
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out_of_memory:
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clazz = (*env)->FindClass (env, "java/lang/InternalError");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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(*env)->ThrowNew (env, clazz, errbuf);
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(*env)->DeleteLocalRef (env, clazz);
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goto done;
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system_error:
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clazz = (*env)->FindClass (env, "java/io/IOException");
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if ((*env)->ExceptionOccurred (env))
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goto done;
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(*env)->ThrowNew (env, clazz, errbuf);
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(*env)->DeleteLocalRef (env, clazz);
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goto done;
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}
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/*
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* private static final native boolean nativeReap()
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*/
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JNIEXPORT jboolean JNICALL
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Java_java_lang_VMProcess_nativeReap (JNIEnv * env, jclass clazz)
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{
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char ebuf[64];
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jfieldID field;
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jint status;
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pid_t pid;
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int err;
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/* Try to reap a child process, but don't block */
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err = cpproc_waitpid((pid_t)-1, &status, &pid, WNOHANG);
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if (err == 0 && pid == 0)
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return JNI_FALSE;
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/* Check result from waitpid() */
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if (err != 0)
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{
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if (err == ECHILD || err == EINTR)
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return JNI_FALSE;
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snprintf(ebuf, sizeof (ebuf), "waitpid(%ld): %s",
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(long) pid, cpnative_getErrorString(errno));
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clazz = (*env)->FindClass (env, "java/lang/InternalError");
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if ((*env)->ExceptionOccurred (env))
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return JNI_FALSE;
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(*env)->ThrowNew (env, clazz, ebuf);
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(*env)->DeleteLocalRef (env, clazz);
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return JNI_FALSE;
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}
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/* Get exit code; for signal termination return negative signal value XXX */
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if (WIFEXITED (status))
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status = (jint) (jbyte) WEXITSTATUS (status);
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else if (WIFSIGNALED (status))
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status = -(jint) WTERMSIG (status);
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else
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return JNI_FALSE; /* process merely stopped; ignore */
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/* Return process pid and exit status */
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field = (*env)->GetStaticFieldID (env, clazz, "reapedPid", "J");
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if ((*env)->ExceptionOccurred (env))
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return JNI_FALSE;
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(*env)->SetStaticLongField (env, clazz, field, (jlong) pid);
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if ((*env)->ExceptionOccurred (env))
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return JNI_FALSE;
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field = (*env)->GetStaticFieldID (env, clazz, "reapedExitValue", "I");
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if ((*env)->ExceptionOccurred (env))
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return JNI_FALSE;
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(*env)->SetStaticIntField (env, clazz, field, status);
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if ((*env)->ExceptionOccurred (env))
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return JNI_FALSE;
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/* Done */
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return JNI_TRUE;
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}
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/*
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* private static final native void nativeKill(long)
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*/
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JNIEXPORT void JNICALL
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Java_java_lang_VMProcess_nativeKill (JNIEnv * env, jclass clazz, jlong pid)
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{
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char ebuf[64];
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int err;
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err = cpproc_kill((pid_t) pid, SIGKILL);
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if (err != 0)
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{
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snprintf (ebuf, sizeof (ebuf), "kill(%ld): %s",
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(long) pid, cpnative_getErrorString (err));
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clazz = (*env)->FindClass (env, "java/lang/InternalError");
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if ((*env)->ExceptionOccurred (env))
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return;
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(*env)->ThrowNew (env, clazz, ebuf);
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(*env)->DeleteLocalRef (env, clazz);
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}
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}
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