2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* proc_tty.c -- handles /proc/tty
|
|
|
|
*
|
|
|
|
* Copyright 1997, Theodore Ts'o
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <asm/uaccess.h>
|
2008-04-29 10:01:58 +02:00
|
|
|
#include <linux/module.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#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)
|
|
|
|
{
|
2007-07-16 08:39:54 +02:00
|
|
|
struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers);
|
2005-04-17 00:20:36 +02:00
|
|
|
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)
|
|
|
|
{
|
2007-05-08 09:27:12 +02:00
|
|
|
mutex_lock(&tty_mutex);
|
2007-07-16 08:39:54 +02:00
|
|
|
return seq_list_start(&tty_drivers, *pos);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static void *t_next(struct seq_file *m, void *v, loff_t *pos)
|
|
|
|
{
|
2007-07-16 08:39:54 +02:00
|
|
|
return seq_list_next(v, &tty_drivers, pos);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static void t_stop(struct seq_file *m, void *v)
|
|
|
|
{
|
2007-05-08 09:27:12 +02:00
|
|
|
mutex_unlock(&tty_mutex);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2008-02-08 13:21:19 +01:00
|
|
|
static const struct seq_operations tty_drivers_op = {
|
2005-04-17 00:20:36 +02:00
|
|
|
.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);
|
|
|
|
}
|
|
|
|
|
2007-02-12 09:55:34 +01:00
|
|
|
static const struct file_operations proc_tty_drivers_operations = {
|
2005-04-17 00:20:36 +02:00
|
|
|
.open = tty_drivers_open,
|
|
|
|
.read = seq_read,
|
|
|
|
.llseek = seq_lseek,
|
|
|
|
.release = seq_release,
|
|
|
|
};
|
|
|
|
|
2008-04-29 10:01:58 +02:00
|
|
|
static void * tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2008-04-29 10:01:58 +02:00
|
|
|
return (*pos < NR_LDISCS) ? pos : NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void * tty_ldiscs_seq_next(struct seq_file *m, void *v, loff_t *pos)
|
|
|
|
{
|
|
|
|
(*pos)++;
|
|
|
|
return (*pos < NR_LDISCS) ? pos : NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tty_ldiscs_seq_stop(struct seq_file *m, void *v)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tty_ldiscs_seq_show(struct seq_file *m, void *v)
|
|
|
|
{
|
|
|
|
int i = *(loff_t *)v;
|
2005-04-17 00:20:36 +02:00
|
|
|
struct tty_ldisc *ld;
|
|
|
|
|
2008-04-29 10:01:58 +02:00
|
|
|
ld = tty_ldisc_get(i);
|
|
|
|
if (ld == NULL)
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
2008-04-29 10:01:58 +02:00
|
|
|
seq_printf(m, "%-10s %2d\n", ld->name ? ld->name : "???", i);
|
|
|
|
tty_ldisc_put(i);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct seq_operations tty_ldiscs_seq_ops = {
|
|
|
|
.start = tty_ldiscs_seq_start,
|
|
|
|
.next = tty_ldiscs_seq_next,
|
|
|
|
.stop = tty_ldiscs_seq_stop,
|
|
|
|
.show = tty_ldiscs_seq_show,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int proc_tty_ldiscs_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
return seq_open(file, &tty_ldiscs_seq_ops);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2008-04-29 10:01:58 +02:00
|
|
|
static const struct file_operations tty_ldiscs_proc_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = proc_tty_ldiscs_open,
|
|
|
|
.read = seq_read,
|
|
|
|
.llseek = seq_lseek,
|
|
|
|
.release = seq_release,
|
|
|
|
};
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* 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->read_proc && !driver->write_proc) ||
|
|
|
|
!driver->driver_name ||
|
|
|
|
driver->proc_entry)
|
|
|
|
return;
|
|
|
|
|
|
|
|
ent = create_proc_entry(driver->driver_name, 0, proc_tty_driver);
|
|
|
|
if (!ent)
|
|
|
|
return;
|
|
|
|
ent->read_proc = driver->read_proc;
|
|
|
|
ent->write_proc = driver->write_proc;
|
|
|
|
ent->owner = driver->owner;
|
|
|
|
ent->data = 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.
|
|
|
|
*/
|
2008-04-29 10:01:58 +02:00
|
|
|
proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL);
|
|
|
|
proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
|
2008-04-29 10:01:37 +02:00
|
|
|
proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|