1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <android/file_descriptor_jni.h>
18 
19 #include <stddef.h>
20 
21 #define LOG_TAG "file_descriptor_jni"
22 #include "ALog-priv.h"
23 
24 #include "JniConstants.h"
25 
26 static void EnsureArgumentIsFileDescriptor(JNIEnv* env, jobject instance) {
27     ALOG_ALWAYS_FATAL_IF(instance == NULL, "FileDescriptor is NULL");
28     jclass jifd = JniConstants_FileDescriptorClass(env);
29     ALOG_ALWAYS_FATAL_IF(!(*env)->IsInstanceOf(env, instance, jifd),
30                          "Argument is not a FileDescriptor");
31 }
32 
33 JNIEXPORT _Nullable jobject AFileDescriptor_create(JNIEnv* env) {
34     return (*env)->NewObject(env,
35                              JniConstants_FileDescriptorClass(env),
36                              JniConstants_FileDescriptor_init(env));
37 }
38 
39 JNIEXPORT int AFileDescriptor_getFd(JNIEnv* env, jobject fileDescriptor) {
40     EnsureArgumentIsFileDescriptor(env, fileDescriptor);
41     return (*env)->GetIntField(env, fileDescriptor, JniConstants_FileDescriptor_descriptor(env));
42 }
43 
44 JNIEXPORT void AFileDescriptor_setFd(JNIEnv* env, jobject fileDescriptor, int fd) {
45     EnsureArgumentIsFileDescriptor(env, fileDescriptor);
46     (*env)->SetIntField(env, fileDescriptor, JniConstants_FileDescriptor_descriptor(env), fd);
47 }
48