c实现写设备节点

Posted 2021-12-07 蚁人日记

二 :JNI部分修改
1.添加c文件，com_android_server_SelfManagerService.cpp，文件命名是有原因的，是因为我们的本地接口在com/android/server/SelfManagerService.java中，所以我们这样命名
frameworks/base/services/core/jni/com_android_server_SelfManagerService.cpp：
#define LOG_TAG “zhy”

#include “jni.h”
#include <nativehelper/JNIHelp.h>
#include “android_runtime/AndroidRuntime.h”
#include <utils/misc.h>
#include <utils/Log.h>
#include <hardware/vibrator.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>

//方法在驱动中生成的节点
#define DEV_NAME “/dev/switch_gpio”

namespace android
{
static jint com_android_server_SelfManagerService_tngpio_read (JNIEnv* env, jobject clazz)
{
FILE *fp = NULL;
fp = fopen(DEV_NAME, “w+”);
char buff[255];
fgets(buff, 255, fp);
fclose(fp);
return atoi(buff);
}

static void com_android_server_SelfManagerService_tngpio_write (JNIEnv* env, jobject clazz, int level)
{ 
ALOGE("tngpio_write level= %d", level);
FILE *fp = NULL;
fp = fopen(DEV_NAME, "w+");
char str[255];
sprintf(str,"%d",level);
fputs(str,fp);
fclose(fp);
}
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原文链接：https://blog.csdn.net/weixin_44158983/article/details/106815187