22 struct stdio_dev {  struct
29 	int (*start)(struct stdio_dev *dev);	/* To start the device */  argument
30 	int (*stop)(struct stdio_dev *dev);	/* To stop the device */  argument
35 	void (*putc)(struct stdio_dev *dev, const char c);  argument
37 	void (*puts)(struct stdio_dev *dev, const char *s);  argument
42 	int (*tstc)(struct stdio_dev *dev);  argument
43 	int (*getc)(struct stdio_dev *dev);	/* To get that char */  argument
54 extern struct stdio_dev *stdio_devices[];  argument
60 int	stdio_register (struct stdio_dev * dev);
61 int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp);
88 int stdio_deregister_dev(struct stdio_dev *dev, int force);
91 struct stdio_dev* stdio_get_by_name(const char* name);
92 struct stdio_dev* stdio_clone(struct stdio_dev *dev);