EVIOCGNAME：Get Device Name

           linux内核提供了一个Input子系统来实现的，Input子系统会在/dev/input/路径下创建我们硬件输入设备的节点，一般情况下在我们的手机中这些节点是以eventXX来命名的，如event0，event1等等，可以利用EVIOCGNAME获取此事件结点名称。这就是android中对于input事件处理数据的来源点。

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通过ioctl命令EVIOCGNAME，能获取dev/input/event*对应的Device Name。

 

实例：

openInput(const char* inputName) {
    int fd = -1;
    const char *dirname = "/dev/input";
    char devname[PATH_MAX];
    char *filename;
    DIR *dir;
    struct dirent *de;
    dir = opendir(dirname);
    if(dir == NULL)
        return -1;
    strcpy(devname, dirname);
    filename = devname + strlen(devname);
    *filename++ = '/';
    while((de = readdir(dir))) {
        if(de->d_name[0] == '.' &&
                (de->d_name[1] == '' ||
                        (de->d_name[1] == '.' && de->d_name[2] == '')))
            continue;
        strcpy(filename, de->d_name);
        fd = open(devname, O_RDONLY);
        if (fd>=0) {
            char name[80];
            if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
                name[0] = '';
            }
            if (!strcmp(name, inputName)) {
                break;
            } else {
                close(fd);
                fd = -1;
            }
        }
    }
    closedir(dir);
    LOGE_IF(fd<0, "couldn't find '%s' input device", inputName);
    LOGI_IF(fd>=0, "Found '%s' input device in %s", inputName, dirname);
    return fd;

}

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http://blog.csdn.net/andyhuabing/article/details/7006688