xv6/dev.h

struct devsw {
  int (*d_open)(char *, int);
  int (*d_read)(int, char *, int);
  int (*d_write)(int, char *, int);
  int (*d_close)(int);
};

extern struct devsw devsw[];

#define CONSOLE 1
devsw checkpoint: write(fd,"hello\n",6) where fd is a console dev almost works 2006-08-09 16:04:04 +00:00			`struct devsw {`
			`int (d_open)(char , int);`
init creates console, opens 0/1/2, runs sh sh accepts 0-argument commands (like userfs) reads from console 2006-08-11 13:55:18 +00:00			`int (d_read)(int, char , int);`
			`int (d_write)(int, char , int);`
devsw checkpoint: write(fd,"hello\n",6) where fd is a console dev almost works 2006-08-09 16:04:04 +00:00			`int (*d_close)(int);`
			`};`

			`extern struct devsw devsw[];`

			`#define CONSOLE 1`