[linux.git] / fs / proc / proc_tty.c

/*
 * proc_tty.c -- handles /proc/tty
 *
 * Copyright 1997, Theodore Ts'o
 */

#include <asm/uaccess.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/tty.h>
#include <linux/seq_file.h>
#include <linux/bitops.h>

/*
 * The /proc/tty directory inodes...
 */
static struct proc_dir_entry *proc_tty_ldisc, *proc_tty_driver;

/*
 * This is the handler for /proc/tty/drivers
 */
static void show_tty_range(struct seq_file *m, struct tty_driver *p,
	dev_t from, int num)
{
	seq_printf(m, "%-20s ", p->driver_name ? p->driver_name : "unknown");
	seq_printf(m, "/dev/%-8s ", p->name);
	if (p->num > 1) {
		seq_printf(m, "%3d %d-%d ", MAJOR(from), MINOR(from),
			MINOR(from) + num - 1);
	} else {
		seq_printf(m, "%3d %7d ", MAJOR(from), MINOR(from));
	}
	switch (p->type) {
	case TTY_DRIVER_TYPE_SYSTEM:
		seq_printf(m, "system");
		if (p->subtype == SYSTEM_TYPE_TTY)
			seq_printf(m, ":/dev/tty");
		else if (p->subtype == SYSTEM_TYPE_SYSCONS)
			seq_printf(m, ":console");
		else if (p->subtype == SYSTEM_TYPE_CONSOLE)
			seq_printf(m, ":vtmaster");
		break;
	case TTY_DRIVER_TYPE_CONSOLE:
		seq_printf(m, "console");
		break;
	case TTY_DRIVER_TYPE_SERIAL:
		seq_printf(m, "serial");
		break;
	case TTY_DRIVER_TYPE_PTY:
		if (p->subtype == PTY_TYPE_MASTER)
			seq_printf(m, "pty:master");
		else if (p->subtype == PTY_TYPE_SLAVE)
			seq_printf(m, "pty:slave");
		else
			seq_printf(m, "pty");
		break;
	default:
		seq_printf(m, "type:%d.%d", p->type, p->subtype);
	}
	seq_putc(m, '\n');
}

static int show_tty_driver(struct seq_file *m, void *v)
{
	struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers);
	dev_t from = MKDEV(p->major, p->minor_start);
	dev_t to = from + p->num;

	if (&p->tty_drivers == tty_drivers.next) {
		/* pseudo-drivers first */
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/tty", "tty");
		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 0);
		seq_printf(m, "system:/dev/tty\n");
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/console", "console");
		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 1);
		seq_printf(m, "system:console\n");
#ifdef CONFIG_UNIX98_PTYS
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/ptmx", "ptmx");
		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 2);
		seq_printf(m, "system\n");
#endif
#ifdef CONFIG_VT
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/vc/0", "vc/0");
		seq_printf(m, "%3d %7d ", TTY_MAJOR, 0);
		seq_printf(m, "system:vtmaster\n");
#endif
	}

	while (MAJOR(from) < MAJOR(to)) {
		dev_t next = MKDEV(MAJOR(from)+1, 0);
		show_tty_range(m, p, from, next - from);
		from = next;
	}
	if (from != to)
		show_tty_range(m, p, from, to - from);
	return 0;
}

/* iterator */
static void *t_start(struct seq_file *m, loff_t *pos)
{
	mutex_lock(&tty_mutex);
	return seq_list_start(&tty_drivers, *pos);
}

static void *t_next(struct seq_file *m, void *v, loff_t *pos)
{
	return seq_list_next(v, &tty_drivers, pos);
}

static void t_stop(struct seq_file *m, void *v)
{
	mutex_unlock(&tty_mutex);
}

static const struct seq_operations tty_drivers_op = {
	.start	= t_start,
	.next	= t_next,
	.stop	= t_stop,
	.show	= show_tty_driver
};

static int tty_drivers_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &tty_drivers_op);
}

static const struct file_operations proc_tty_drivers_operations = {
	.open		= tty_drivers_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

/*
 * This function is called by tty_register_driver() to handle
 * registering the driver's /proc handler into /proc/tty/driver/<foo>
 */
void proc_tty_register_driver(struct tty_driver *driver)
{
	struct proc_dir_entry *ent;
		
	if (!driver->driver_name || driver->proc_entry ||
	    !driver->ops->proc_fops)
		return;

	ent = proc_create_data(driver->driver_name, 0, proc_tty_driver,
			       driver->ops->proc_fops, driver);
	driver->proc_entry = ent;
}

/*
 * This function is called by tty_unregister_driver()
 */
void proc_tty_unregister_driver(struct tty_driver *driver)
{
	struct proc_dir_entry *ent;

	ent = driver->proc_entry;
	if (!ent)
		return;
		
	remove_proc_entry(driver->driver_name, proc_tty_driver);
	
	driver->proc_entry = NULL;
}

/*
 * Called by proc_root_init() to initialize the /proc/tty subtree
 */
void __init proc_tty_init(void)
{
	if (!proc_mkdir("tty", NULL))
		return;
	proc_tty_ldisc = proc_mkdir("tty/ldisc", NULL);
	/*
	 * /proc/tty/driver/serial reveals the exact character counts for
	 * serial links which is just too easy to abuse for inferring
	 * password lengths and inter-keystroke timings during password
	 * entry.
	 */
	proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL);
	proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
	proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* proc_tty.c -- handles /proc/tty
	3	*
	4	* Copyright 1997, Theodore Ts'o
	5	*/
	6
	7	#include <asm/uaccess.h>
b640a89d	8	#include <linux/module.h>
1da177e4 LT	9	#include <linux/init.h>
	10	#include <linux/errno.h>
	11	#include <linux/time.h>
	12	#include <linux/proc_fs.h>
	13	#include <linux/stat.h>
	14	#include <linux/tty.h>
	15	#include <linux/seq_file.h>
	16	#include <linux/bitops.h>
	17
1da177e4 LT	18	/*
	19	* The /proc/tty directory inodes...
	20	*/
	21	static struct proc_dir_entry proc_tty_ldisc, proc_tty_driver;
	22
	23	/*
	24	* This is the handler for /proc/tty/drivers
	25	*/
	26	static void show_tty_range(struct seq_file m, struct tty_driver p,
	27	dev_t from, int num)
	28	{
	29	seq_printf(m, "%-20s ", p->driver_name ? p->driver_name : "unknown");
	30	seq_printf(m, "/dev/%-8s ", p->name);
	31	if (p->num > 1) {
	32	seq_printf(m, "%3d %d-%d ", MAJOR(from), MINOR(from),
	33	MINOR(from) + num - 1);
	34	} else {
	35	seq_printf(m, "%3d %7d ", MAJOR(from), MINOR(from));
	36	}
	37	switch (p->type) {
	38	case TTY_DRIVER_TYPE_SYSTEM:
	39	seq_printf(m, "system");
	40	if (p->subtype == SYSTEM_TYPE_TTY)
	41	seq_printf(m, ":/dev/tty");
	42	else if (p->subtype == SYSTEM_TYPE_SYSCONS)
	43	seq_printf(m, ":console");
	44	else if (p->subtype == SYSTEM_TYPE_CONSOLE)
	45	seq_printf(m, ":vtmaster");
	46	break;
	47	case TTY_DRIVER_TYPE_CONSOLE:
	48	seq_printf(m, "console");
	49	break;
	50	case TTY_DRIVER_TYPE_SERIAL:
	51	seq_printf(m, "serial");
	52	break;
	53	case TTY_DRIVER_TYPE_PTY:
	54	if (p->subtype == PTY_TYPE_MASTER)
	55	seq_printf(m, "pty:master");
	56	else if (p->subtype == PTY_TYPE_SLAVE)
	57	seq_printf(m, "pty:slave");
	58	else
	59	seq_printf(m, "pty");
	60	break;
	61	default:
	62	seq_printf(m, "type:%d.%d", p->type, p->subtype);
	63	}
	64	seq_putc(m, '\n');
	65	}
	66
	67	static int show_tty_driver(struct seq_file m, void v)
	68	{
25216b00	69	struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers);
1da177e4 LT	70	dev_t from = MKDEV(p->major, p->minor_start);
	71	dev_t to = from + p->num;
	72
	73	if (&p->tty_drivers == tty_drivers.next) {
	74	/* pseudo-drivers first */
	75	seq_printf(m, "%-20s /dev/%-8s ", "/dev/tty", "tty");
	76	seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 0);
	77	seq_printf(m, "system:/dev/tty\n");
	78	seq_printf(m, "%-20s /dev/%-8s ", "/dev/console", "console");
	79	seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 1);
	80	seq_printf(m, "system:console\n");
	81	#ifdef CONFIG_UNIX98_PTYS
	82	seq_printf(m, "%-20s /dev/%-8s ", "/dev/ptmx", "ptmx");
	83	seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 2);
	84	seq_printf(m, "system\n");
	85	#endif
	86	#ifdef CONFIG_VT
	87	seq_printf(m, "%-20s /dev/%-8s ", "/dev/vc/0", "vc/0");
	88	seq_printf(m, "%3d %7d ", TTY_MAJOR, 0);
	89	seq_printf(m, "system:vtmaster\n");
	90	#endif
	91	}
	92
	93	while (MAJOR(from) < MAJOR(to)) {
	94	dev_t next = MKDEV(MAJOR(from)+1, 0);
	95	show_tty_range(m, p, from, next - from);
	96	from = next;
	97	}
	98	if (from != to)
	99	show_tty_range(m, p, from, to - from);
	100	return 0;
	101	}
	102
	103	/* iterator */
	104	static void t_start(struct seq_file m, loff_t *pos)
	105	{
ca509f69	106	mutex_lock(&tty_mutex);
25216b00	107	return seq_list_start(&tty_drivers, *pos);
1da177e4 LT	108	}
	109
	110	static void t_next(struct seq_file m, void v, loff_t pos)
	111	{
25216b00	112	return seq_list_next(v, &tty_drivers, pos);
1da177e4 LT	113	}
	114
	115	static void t_stop(struct seq_file m, void v)
	116	{
ca509f69	117	mutex_unlock(&tty_mutex);
1da177e4 LT	118	}
1da177e4 LT	119
03a44825	120	static const struct seq_operations tty_drivers_op = {
1da177e4 LT	121	.start = t_start,
	122	.next = t_next,
	123	.stop = t_stop,
	124	.show = show_tty_driver
	125	};
	126
	127	static int tty_drivers_open(struct inode inode, struct file file)
	128	{
	129	return seq_open(file, &tty_drivers_op);
	130	}
	131
00977a59	132	static const struct file_operations proc_tty_drivers_operations = {
1da177e4 LT	133	.open = tty_drivers_open,
	134	.read = seq_read,
	135	.llseek = seq_lseek,
	136	.release = seq_release,
	137	};
	138
1da177e4 LT	139	/*
	140	* This function is called by tty_register_driver() to handle
	141	* registering the driver's /proc handler into /proc/tty/driver/<foo>
	142	*/
	143	void proc_tty_register_driver(struct tty_driver *driver)
	144	{
	145	struct proc_dir_entry *ent;
	146
0f043a81 AD	147	if (!driver->driver_name \|\| driver->proc_entry \|\|
0f043a81 AD	148	!driver->ops->proc_fops)
1da177e4 LT	149	return;
1da177e4 LT	150
0f043a81 AD	151	ent = proc_create_data(driver->driver_name, 0, proc_tty_driver,
0f043a81 AD	152	driver->ops->proc_fops, driver);
1da177e4 LT	153	driver->proc_entry = ent;
	154	}
	155
	156	/*
	157	* This function is called by tty_unregister_driver()
	158	*/
	159	void proc_tty_unregister_driver(struct tty_driver *driver)
	160	{
	161	struct proc_dir_entry *ent;
	162
	163	ent = driver->proc_entry;
	164	if (!ent)
	165	return;
	166
	167	remove_proc_entry(driver->driver_name, proc_tty_driver);
	168
	169	driver->proc_entry = NULL;
	170	}
	171
	172	/*
	173	* Called by proc_root_init() to initialize the /proc/tty subtree
	174	*/
	175	void __init proc_tty_init(void)
	176	{
1da177e4 LT	177	if (!proc_mkdir("tty", NULL))
	178	return;
	179	proc_tty_ldisc = proc_mkdir("tty/ldisc", NULL);
	180	/*
	181	* /proc/tty/driver/serial reveals the exact character counts for
	182	* serial links which is just too easy to abuse for inferring
	183	* password lengths and inter-keystroke timings during password
	184	* entry.
	185	*/
b640a89d AD	186	proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR\|S_IXUSR, NULL);
b640a89d AD	187	proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
0d5c9f5f	188	proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
1da177e4	189	}