android JNI库实现reboot，recovery

1、recovery函数：

#defineUPDATE_TITLE"--update_package="#define UPDATE_COMMAND_FILE"/cache/recovery/command"#define UPDATE_FLAG_FILE"/cache/recovery/last_flag"#define LAST_INSTALL_FILE"/cache/recovery/last_install"#define LAST_LOG_FILE"/cache/recovery/last_log"#define LAST_LOCALE_FILE"/cache/recovery/last_locale"#define printf ALOGDint factory_data_reset(void){char data[] = {"--wipe_data\n--locale=en_US\n"};int len = 0, fd;printf("[%s]command:%s\n", __FUNCTION__, data);fd = open(UPDATE_COMMAND_FILE, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);if (fd < 0){printf("[%s]creat command file failed\n", __FUNCTION__);return -3;}len = strlen(data);if (write(fd, data, len) != len){printf("[%s]write command file failed\n", __FUNCTION__);close(fd);return -4;}close(fd);//delete last_install,last_logif (remove(LAST_INSTALL_FILE) != 0)printf("[%s]remove last_install failed\n", __FUNCTION__);if (remove(LAST_LOG_FILE) != 0)printf("[%s]remove last_log failed\n", __FUNCTION__);if (remove(LAST_LOCALE_FILE) != 0)printf("[%s]remove last_locale failed\n", __FUNCTION__);sync();//reboot to recovery__reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, (void*) "recovery");//这句需要root权限！printf("[%s]reboot failed\n", __FUNCTION__);return -7;}

2、OTA升级函数

int install_ota_package(char const * package_file, int use_fuse){char *path = NULL;int len = 0, size, fd;len = strlen(package_file);if (len <= 0){printf("[%s]strlen(package_file)=%d\n", __FUNCTION__, len);return -1;}path = (char*)malloc(len+24+3);if (path == 0){printf("[%s]malloc failed\n", __FUNCTION__);return -2;}//UPDATE_COMMAND_FILEmemset(path, 0, len+24+3);if (use_fuse)//(strncmp(package_file, "/vtfuse", 7) != 0){strcpy(path, "--update_package=/vtfuse");strcpy(&path[24], package_file);strcpy(&path[24+len], "\n");}else{strcpy(path, "--update_package=");strcpy(&path[17], package_file);strcpy(&path[17+len], "\n");}printf("[%s]command:%s\n", __FUNCTION__, path);fd = open(UPDATE_COMMAND_FILE, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);if (fd < 0){printf("[%s]creat command file failed\n", __FUNCTION__);free(path);return -3;}size = strlen(path);if (write(fd, path, size) != size){printf("[%s]write command file failed\n", __FUNCTION__);free(path);close(fd);return -4;}close(fd);//UPDATE_FLAG_FILEmemset(path, 0, len+24+3);if (use_fuse)//(strncmp(package_file, "/vtfuse", 7) != 0){strcpy(path, "updating$path=/vtfuse");strcpy(&path[21], package_file);strcpy(&path[21+len], "\n");}else{strcpy(path, "updating$path=");strcpy(&path[14], package_file);strcpy(&path[14+len], "\n");}printf("[%s]last_flag:%s\n", __FUNCTION__, path);fd = open(UPDATE_FLAG_FILE, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);if (fd < 0){printf("[%s]creat last_flag file failed\n", __FUNCTION__);free(path);return -5;}size = strlen(path);if (write(fd, path, size) != size){printf("[%s]write last_flag file failed\n", __FUNCTION__);free(path);close(fd);return -6;}close(fd);//delete last_install,last_logif (remove(LAST_INSTALL_FILE) != 0)printf("[%s]remove last_install failed\n", __FUNCTION__);if (remove(LAST_LOG_FILE) != 0)printf("[%s]remove last_log failed\n", __FUNCTION__);sync();free(path);//reboot to recovery__reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, (void*) "recovery");//同样需要root权限printf("[%s]reboot failed\n", __FUNCTION__);return -7;}

3、其实上面两个函数如果编译成exe在root下运行确实可以实现recovery和OTA升级，如何在jni或者apk中掉用和实现了？

3.1 apk申请system权限，需要签名或者在源码中编译！

3.2 apk是无法直接获取到root权限的，最多system权限，因此我们可以采service！

参考：http://blog.chinaunix.net/uid-12348673-id-3030823.html

3.3 将上面的函数写两个应用，编译后放在/system/bin/下，这样我们即可在jni中或apk中去开启service：

init.rc中：

servicerecovery /system/bin/recovery

disabled

apk： SystemProperties.set("ctl.start","recovery");

jni：property_set("ctl.start","recovery");

3.4这样就可以实现recovery，OTA了！

更多相关文章

随机推荐