192 lines
5.9 KiB
C
192 lines
5.9 KiB
C
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* JNI helper functions.
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*
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* This file may be included by C or C++ code, which is trouble because jni.h
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* uses different typedefs for JNIEnv in each language.
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*
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* TODO: remove C support.
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*/
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#ifndef NATIVEHELPER_JNIHELP_H_
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#define NATIVEHELPER_JNIHELP_H_
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#include "jni.h"
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#include <unistd.h>
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#ifndef NELEM
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# define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Register one or more native methods with a particular class.
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* "className" looks like "java/lang/String". Aborts on failure.
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* TODO: fix all callers and change the return type to void.
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*/
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int jniRegisterNativeMethods(C_JNIEnv* env, const char* className, const JNINativeMethod* gMethods, int numMethods);
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/*
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* Throw an exception with the specified class and an optional message.
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*
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* The "className" argument will be passed directly to FindClass, which
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* takes strings with slashes (e.g. "java/lang/Object").
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*
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* If an exception is currently pending, we log a warning message and
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* clear it.
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*
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* Returns 0 on success, nonzero if something failed (e.g. the exception
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* class couldn't be found, so *an* exception will still be pending).
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*
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* Currently aborts the VM if it can't throw the exception.
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*/
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int jniThrowException(C_JNIEnv* env, const char* className, const char* msg);
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/*
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* Throw a java.lang.NullPointerException, with an optional message.
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*/
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int jniThrowNullPointerException(C_JNIEnv* env, const char* msg);
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/*
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* Throw a java.lang.RuntimeException, with an optional message.
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*/
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int jniThrowRuntimeException(C_JNIEnv* env, const char* msg);
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/*
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* Throw a java.io.IOException, generating the message from errno.
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*/
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int jniThrowIOException(C_JNIEnv* env, int errnum);
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/*
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* Return a pointer to a locale-dependent error string explaining errno
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* value 'errnum'. The returned pointer may or may not be equal to 'buf'.
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* This function is thread-safe (unlike strerror) and portable (unlike
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* strerror_r).
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*/
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const char* jniStrError(int errnum, char* buf, size_t buflen);
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/*
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* Returns a new java.io.FileDescriptor for the given int fd.
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*/
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jobject jniCreateFileDescriptor(C_JNIEnv* env, int fd);
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/*
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* Returns the int fd from a java.io.FileDescriptor.
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*/
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int jniGetFDFromFileDescriptor(C_JNIEnv* env, jobject fileDescriptor);
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/*
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* Sets the int fd in a java.io.FileDescriptor.
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*/
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void jniSetFileDescriptorOfFD(C_JNIEnv* env, jobject fileDescriptor, int value);
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/*
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* Returns the reference from a java.lang.ref.Reference.
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*/
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jobject jniGetReferent(C_JNIEnv* env, jobject ref);
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/*
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* Log a message and an exception.
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* If exception is NULL, logs the current exception in the JNI environment.
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*/
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void jniLogException(C_JNIEnv* env, int priority, const char* tag, jthrowable exception);
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#ifdef __cplusplus
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}
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#endif
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/*
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* For C++ code, we provide inlines that map to the C functions. g++ always
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* inlines these, even on non-optimized builds.
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*/
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#if defined(__cplusplus)
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inline int jniRegisterNativeMethods(JNIEnv* env, const char* className, const JNINativeMethod* gMethods, int numMethods) {
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return jniRegisterNativeMethods(&env->functions, className, gMethods, numMethods);
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}
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inline int jniThrowException(JNIEnv* env, const char* className, const char* msg) {
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return jniThrowException(&env->functions, className, msg);
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}
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extern "C" int jniThrowExceptionFmt(C_JNIEnv* env, const char* className, const char* fmt, va_list args);
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/*
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* Equivalent to jniThrowException but with a printf-like format string and
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* variable-length argument list. This is only available in C++.
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*/
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inline int jniThrowExceptionFmt(JNIEnv* env, const char* className, const char* fmt, ...) {
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va_list args;
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va_start(args, fmt);
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return jniThrowExceptionFmt(&env->functions, className, fmt, args);
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va_end(args);
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}
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inline int jniThrowNullPointerException(JNIEnv* env, const char* msg) {
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return jniThrowNullPointerException(&env->functions, msg);
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}
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inline int jniThrowRuntimeException(JNIEnv* env, const char* msg) {
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return jniThrowRuntimeException(&env->functions, msg);
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}
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inline int jniThrowIOException(JNIEnv* env, int errnum) {
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return jniThrowIOException(&env->functions, errnum);
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}
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inline jobject jniCreateFileDescriptor(JNIEnv* env, int fd) {
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return jniCreateFileDescriptor(&env->functions, fd);
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}
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inline int jniGetFDFromFileDescriptor(JNIEnv* env, jobject fileDescriptor) {
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return jniGetFDFromFileDescriptor(&env->functions, fileDescriptor);
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}
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inline void jniSetFileDescriptorOfFD(JNIEnv* env, jobject fileDescriptor, int value) {
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jniSetFileDescriptorOfFD(&env->functions, fileDescriptor, value);
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}
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inline jobject jniGetReferent(JNIEnv* env, jobject ref) {
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return jniGetReferent(&env->functions, ref);
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}
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inline void jniLogException(JNIEnv* env, int priority, const char* tag, jthrowable exception = NULL) {
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jniLogException(&env->functions, priority, tag, exception);
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}
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#endif
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/*
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* TEMP_FAILURE_RETRY is defined by some, but not all, versions of
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* <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
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* not already defined, then define it here.
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*/
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#ifndef TEMP_FAILURE_RETRY
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/* Used to retry syscalls that can return EINTR. */
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#define TEMP_FAILURE_RETRY(exp) ({ \
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typeof (exp) _rc; \
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do { \
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_rc = (exp); \
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} while (_rc == -1 && errno == EINTR); \
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_rc; })
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#endif
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#endif /* NATIVEHELPER_JNIHELP_H_ */
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