1 // SPDX-License-Identifier: GPL-2.0
3  * proc_tty.c -- handles /proc/tty
26 static void show_tty_range(struct seq_file *m, struct tty_driver *p,  in show_tty_range()  argument
27 	dev_t from, int num)  in show_tty_range()  argument
29 	seq_printf(m, "%-20s ", p->driver_name ? p->driver_name : "unknown");  in show_tty_range()
30 	seq_printf(m, "/dev/%-8s ", p->name);  in show_tty_range()
31 	if (p->num > 1) {  in show_tty_range()
32 		seq_printf(m, "%3d %d-%d ", MAJOR(from), MINOR(from),  in show_tty_range()
33 			MINOR(from) + num - 1);  in show_tty_range()
35 		seq_printf(m, "%3d %7d ", MAJOR(from), MINOR(from));  in show_tty_range()
37 	switch (p->type) {  in show_tty_range()
39 		seq_puts(m, "system");  in show_tty_range()
40 		if (p->subtype == SYSTEM_TYPE_TTY)  in show_tty_range()
41 			seq_puts(m, ":/dev/tty");  in show_tty_range()
42 		else if (p->subtype == SYSTEM_TYPE_SYSCONS)  in show_tty_range()
43 			seq_puts(m, ":console");  in show_tty_range()
44 		else if (p->subtype == SYSTEM_TYPE_CONSOLE)  in show_tty_range()
45 			seq_puts(m, ":vtmaster");  in show_tty_range()
48 		seq_puts(m, "console");  in show_tty_range()
51 		seq_puts(m, "serial");  in show_tty_range()
54 		if (p->subtype == PTY_TYPE_MASTER)  in show_tty_range()
55 			seq_puts(m, "pty:master");  in show_tty_range()
56 		else if (p->subtype == PTY_TYPE_SLAVE)  in show_tty_range()
57 			seq_puts(m, "pty:slave");  in show_tty_range()
59 			seq_puts(m, "pty");  in show_tty_range()
62 		seq_printf(m, "type:%d.%d", p->type, p->subtype);  in show_tty_range()
64 	seq_putc(m, '\n');  in show_tty_range()
67 static int show_tty_driver(struct seq_file *m, void *v)  in show_tty_driver()  argument
70 	dev_t from = MKDEV(p->major, p->minor_start);  in show_tty_driver()
71 	dev_t to = from + p->num;  in show_tty_driver()
73 	if (&p->tty_drivers == tty_drivers.next) {  in show_tty_driver()
74 		/* pseudo-drivers first */  in show_tty_driver()
75 		seq_printf(m, "%-20s /dev/%-8s ", "/dev/tty", "tty");  in show_tty_driver()
76 		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 0);  in show_tty_driver()
77 		seq_puts(m, "system:/dev/tty\n");  in show_tty_driver()
78 		seq_printf(m, "%-20s /dev/%-8s ", "/dev/console", "console");  in show_tty_driver()
79 		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 1);  in show_tty_driver()
80 		seq_puts(m, "system:console\n");  in show_tty_driver()
82 		seq_printf(m, "%-20s /dev/%-8s ", "/dev/ptmx", "ptmx");  in show_tty_driver()
83 		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 2);  in show_tty_driver()
84 		seq_puts(m, "system\n");  in show_tty_driver()
87 		seq_printf(m, "%-20s /dev/%-8s ", "/dev/vc/0", "vc/0");  in show_tty_driver()
88 		seq_printf(m, "%3d %7d ", TTY_MAJOR, 0);  in show_tty_driver()
89 		seq_puts(m, "system:vtmaster\n");  in show_tty_driver()
95 		show_tty_range(m, p, from, next - from);  in show_tty_driver()
99 		show_tty_range(m, p, from, to - from);  in show_tty_driver()
104 static void *t_start(struct seq_file *m, loff_t *pos)  in t_start()  argument
110 static void *t_next(struct seq_file *m, void *v, loff_t *pos)  in t_next()  argument
115 static void t_stop(struct seq_file *m, void *v)  in t_stop()  argument
135 	if (!driver->driver_name || driver->proc_entry ||  in proc_tty_register_driver()
136 	    !driver->ops->proc_show)  in proc_tty_register_driver()
139 	ent = proc_create_single_data(driver->driver_name, 0, proc_tty_driver,  in proc_tty_register_driver()
140 			       driver->ops->proc_show, driver);  in proc_tty_register_driver()
141 	driver->proc_entry = ent;  in proc_tty_register_driver()
151 	ent = driver->proc_entry;  in proc_tty_unregister_driver()
155 	remove_proc_entry(ent->name, proc_tty_driver);  in proc_tty_unregister_driver()
157 	driver->proc_entry = NULL;  in proc_tty_unregister_driver()
171 	 * password lengths and inter-keystroke timings during password  in proc_tty_init()