程序，完成在当前目录下用open或者create系统调用创建一个文件(创建权限为0644), 然后输出该文件的类型和组权限(是否具有读、写或执行权限), 并判断文件所有者对该文件是否有执行权限，如果没有，请通过chmod函数给该文件添加执行权限。-Program, completed in the current directory with the open or create system call creates a file (creation permissions to 0644), and then output the file type and group permissions (whether read, write or execute permissions), and determine the owner of the file whether the file has execute permission, and if not, please add the chmod function to the file execute permission.