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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1998,2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This file contains native methods for the Java SLP implementation.
* So far this is just the syslog function.
*
* The file also contains two support functions, one for throwing exceptions
* given a class name, and one for correctly converting unicode Strings to C
* byte arrays.
*/
#include <malloc.h>
#include <jni.h>
#include <syslog.h>
#define CLASS_JAVA_LANG_OUTOFMEMORYERROR "java/lang/OutOfMemoryError"
#define CLASS_JAVA_LANG_STRING "java/lang/String"
#define METHOD_GETBYTES "getBytes"
#define SIG_JAVA_LANG_STRING_GETBYTES "()[B"
/*
* Given a class name of an exception and a message attempt to throw
* a new instance of the exception.
*/
static void
JNU_ThrowByName(JNIEnv *env, const char *name, const char *msg)
{
jclass class = (*env)->FindClass(env, name);
/*
* If class is NULL FindClass() encountered a problem locating the
* desired class and has already called ThrowNew() with an
* exception.
*/
if (class == NULL) {
return;
}
(*env)->ThrowNew(env, class, msg);
(*env)->DeleteLocalRef(env, class);
}
/*
* Convert a Java String into a native set of characters using the
* method String.getBytes(). This will ensure that the appropriate
* character set encoding will be used. This is necessary if the
* Java String uses unicode characters that cannot be easily
* encoded into native chars.
*
* The buffer returned must be released by using free() once it is
* finished with.
*
* This function returns NULL if an exception has been thrown during its
* execution.
*/
static char
*JNU_GetStringNativeChars(JNIEnv *env, jstring jstr)
{
jclass class;
jmethodID method;
jint len;
jbyteArray bytes = NULL;
char *result = NULL;
/*
* Need a local reference for (1) FindClass(), (2) the bytes and
* (3) the FindClass() in ThrowByName() if all goes wrong.
*/
if ((*env)->EnsureLocalCapacity(env, 3) < 0) {
JNU_ThrowByName(
env,
CLASS_JAVA_LANG_OUTOFMEMORYERROR,
NULL);
return (NULL);
}
class = (*env)->FindClass(env, CLASS_JAVA_LANG_STRING);
/*
* If class is NULL FindClass() encountered a problem locating the
* desired class and has already called ThrowNew() with an
* exception.
*/
if (class == NULL) {
return (NULL);
}
method = (*env)->GetMethodID(
env,
class,
METHOD_GETBYTES,
SIG_JAVA_LANG_STRING_GETBYTES);
/*
* If method is NULL GetMethodID() encountered a problem
* locating the desired method and has already called
* ThrowNew() with an exception.
*/
if (method != NULL) {
/*
* Call String.getBytes(), creating our temporary
* byte array
*/
bytes = (*env)->CallObjectMethod(env, jstr, method);
/* See if CallObjectMethod() threw an exception */
if ((*env)->ExceptionCheck(env) == JNI_FALSE) {
len = (*env)->GetArrayLength(env, bytes);
/*
* Allocate a buffer for the native characters,
* need an extra char for string terminator.
* Note: calloc will provide the terminating
* '\0' for us.
*/
result = (char *)calloc(len + 1, sizeof (char));
/*
* If allocation failed assume we are out of
* memory
*/
if (result == NULL) {
JNU_ThrowByName(
env,
CLASS_JAVA_LANG_OUTOFMEMORYERROR,
NULL);
} else {
/*
* Copy the encoded bytes into the
* native string buffer
*/
(*env)->GetByteArrayRegion(
env,
bytes,
0,
len,
(jbyte *)result);
}
}
if (bytes != NULL) {
(*env)->DeleteLocalRef(env, bytes);
}
}
/* Clean up by deleting the local references */
(*env)->DeleteLocalRef(env, class);
return (result);
}
/*
* Class: com_sun_slp_Syslog
* Method: syslog
* Signature: (ILjava/lang/String;)V
*/
/* ARGSUSED */
JNIEXPORT
void JNICALL Java_com_sun_slp_Syslog_syslog(JNIEnv *env,
jobject obj,
jint priority,
jstring jmsg) {
char *msg = JNU_GetStringNativeChars(env, jmsg);
/*
* Check to see if the String conversion was successful,
* if it wasn't an exception will have already been thrown.
*/
if (msg != NULL) {
openlog("slpd", LOG_PID, LOG_DAEMON);
syslog(priority, "%s", msg);
closelog();
free(msg);
}
}
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