RK3399-android9.0添加开机自启服务_init: could not start service '' as part of class

1、创建rk3399\system\core\helloword\helloword.c

#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <termio.h>
#include <stdio.h>
#include <cutils/log.h>
#ifdef LOG_TAG
#undef LOG_TAG
#define LOG_TAG "HellowordService"
#endif 

int main(void)
{
    while(1)
    {
		ALOGE("hello word !\n");
        usleep(1000000);
		
    }
    return 0;
}
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同级目录(system\core\helloword)下创建Android.mk

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_SRC_FILES:= \
    helloword.c
LOCAL_C_INCLUDES += bionic \
$(call include-path-for, libhardware_legacy)/hardware_legacy
LOCAL_MODULE:=helloword
LOCAL_MODULE_TAGS := optional
LOCAL_STATIC_LIBRARIES := libfs_mgr libcutils libc liblog
LOCAL_SHARED_LIBRARIES := libhardware_legacy libnetutils liblog
include $(BUILD_EXECUTABLE)
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添加编译rk3399\device\rockchip\rk3399\rk3399\device.mk
最后一行添加

PRODUCT_PACKAGES += helloword
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2、添加系统服务rk3399\device\rockchip\common\init.rk30board.rc
文件最后面添加上：

service helloword /system/bin/helloword
	class main
	user root
	group root
	oneshot
	seclabel u:r:helloword:s0

on property:sys.boot_completed=1           
	chmod 0777 /system/bin/helloword 
	start helloword
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3、添加权限rk3399\system\sepolicy\vendor\file_contexts
文件最后面空一行添加

/system/bin/helloword u:object_r:helloword_exec:s0 
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同级目录（rk3399\system\sepolicy\vendor）创建文件helloword.te

type helloword, domain, coredomain;
type helloword_exec, exec_type, file_type;
init_daemon_domain(helloword)
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开机查看到服务已经启动：init: starting service 'helloword'...

[    9.043655] init: starting service 'helloword'...
[    9.045210] init: Could not start service 'akmd' as part of class 'main': Cannot find '/system/bin/akmd': No such file or directory
[    9.045611] init: starting service 'zygote'...
[    9.047105] init: starting service 'zygote_secondary'...
[    9.048865] init: starting service 'cameraserver'...
[    9.048983] init: Created socket '/dev/socket/zygote_secondary', mode 660, user 0, group 1000
[    9.050020] init: couldn't write 381 to /dev/cpuset/camera-daemon/tasks: No such file or directory
[    9.051199] init: starting service 'drm'...
[    9.052423] init: Created socket '/dev/socket/zygote', mode 660, user 0, group 1000
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命令查看服务已经running：

console:/ $ getprop | grep "helloword"                                         
[init.svc.helloword]: [running]
[ro.boottime.helloword]: [9042863759]
console:/ $
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查看log：

console:/ $ logcat | grep "HellowordService"
05-05 15:02:37.195   378   378 E HellowordService: hello word !
05-05 15:02:38.195   378   378 E HellowordService: hello word !
05-05 15:02:39.195   378   378 E HellowordService: hello word !
05-05 15:02:40.196   378   378 E HellowordService: hello word !
05-05 15:02:41.196   378   378 E HellowordService: hello word !
05-05 15:02:42.196   378   378 E HellowordService: hello word !
05-05 15:02:43.196   378   378 E HellowordService: hello word !
05-05 15:02:44.197   378   378 E HellowordService: hello word !
05-05 15:02:45.197   378   378 E HellowordService: hello word !
05-05 15:02:46.197   378   378 E HellowordService: hello word !
05-05 15:02:47.198   378   378 E HellowordService: hello word !
05-05 15:02:48.198   378   378 E HellowordService: hello word !
05-05 15:02:49.199   378   378 E HellowordService: hello word !
05-05 15:02:50.199   378   378 E HellowordService: hello word !
05-05 15:02:51.199   378   378 E HellowordService: hello word !
05-05 15:02:52.200   378   378 E HellowordService: hello word !
05-05 15:02:53.200   378   378 E HellowordService: hello word !
05-05 15:02:54.201   378   378 E HellowordService: hello word !
05-05 15:02:55.201   378   378 E HellowordService: hello word !
05-05 15:02:56.202   378   378 E HellowordService: hello word !
05-05 15:02:57.202   378   378 E HellowordService: hello word !
05-05 15:03:01.204   378   378 E HellowordService: hello word !
05-05 15:03:02.204   378   378 E HellowordService: hello word !
05-05 15:03:03.205   378   378 E HellowordService: hello word !
05-05 15:03:04.205   378   378 E HellowordService: hello word !
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