1/*
  2 * Copyright (c) 2010 Werner Fink, Jiri Slaby
  3 *
  4 * Licensed under GPLv2
  5 */
  6
  7#include <linux/console.h>
  8#include <linux/kernel.h>
  9#include <linux/proc_fs.h>
 10#include <linux/seq_file.h>
 11#include <linux/tty_driver.h>
 12
 13/*
 14 * This is handler for /proc/consoles
 15 */
 16static int show_console_dev(struct seq_file *m, void *v)
 17{
 18	static const struct {
 19		short flag;
 20		char name;
 21	} con_flags[] = {
 22		{ CON_ENABLED,		'E' },
 23		{ CON_CONSDEV,		'C' },
 24		{ CON_BOOT,		'B' },
 25		{ CON_PRINTBUFFER,	'p' },
 26		{ CON_BRL,		'b' },
 27		{ CON_ANYTIME,		'a' },
 28	};
 29	char flags[ARRAY_SIZE(con_flags) + 1];
 30	struct console *con = v;
 31	unsigned int a;
 32	int len;
 33	dev_t dev = 0;
 34
 35	if (con->device) {
 36		const struct tty_driver *driver;
 37		int index;
 38		driver = con->device(con, &index);
 39		if (driver) {
 40			dev = MKDEV(driver->major, driver->minor_start);
 41			dev += index;
 42		}
 43	}
 44
 45	for (a = 0; a < ARRAY_SIZE(con_flags); a++)
 46		flags[a] = (con->flags & con_flags[a].flag) ?
 47			con_flags[a].name : ' ';
 48	flags[a] = 0;
 49
 50	seq_printf(m, "%s%d%n", con->name, con->index, &len);
 51	len = 21 - len;
 52	if (len < 1)
 53		len = 1;
 54	seq_printf(m, "%*c%c%c%c (%s)", len, ' ', con->read ? 'R' : '-',
 55			con->write ? 'W' : '-', con->unblank ? 'U' : '-',
 56			flags);
 57	if (dev)
 58		seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
 59
 60	seq_printf(m, "\n");
 61
 62	return 0;
 63}
 64
 65static void *c_start(struct seq_file *m, loff_t *pos)
 66{
 67	struct console *con;
 68	loff_t off = 0;
 69
 70	console_lock();
 71	for_each_console(con)
 72		if (off++ == *pos)
 73			break;
 74
 75	return con;
 76}
 77
 78static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 79{
 80	struct console *con = v;
 81	++*pos;
 82	return con->next;
 83}
 84
 85static void c_stop(struct seq_file *m, void *v)
 86{
 87	console_unlock();
 88}
 89
 90static const struct seq_operations consoles_op = {
 91	.start	= c_start,
 92	.next	= c_next,
 93	.stop	= c_stop,
 94	.show	= show_console_dev
 95};
 96
 97static int consoles_open(struct inode *inode, struct file *file)
 98{
 99	return seq_open(file, &consoles_op);
100}
101
102static const struct file_operations proc_consoles_operations = {
103	.open		= consoles_open,
104	.read		= seq_read,
105	.llseek		= seq_lseek,
106	.release	= seq_release,
107};
108
109static int __init proc_consoles_init(void)
110{
111	proc_create("consoles", 0, NULL, &proc_consoles_operations);
112	return 0;
113}
114module_init(proc_consoles_init);

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (c) 2010 Werner Fink, Jiri Slaby
 
 
 4 */
 5
 6#include <linux/console.h>
 7#include <linux/kernel.h>
 8#include <linux/proc_fs.h>
 9#include <linux/seq_file.h>
10#include <linux/tty_driver.h>
11
12/*
13 * This is handler for /proc/consoles
14 */
15static int show_console_dev(struct seq_file *m, void *v)
16{
17	static const struct {
18		short flag;
19		char name;
20	} con_flags[] = {
21		{ CON_ENABLED,		'E' },
22		{ CON_CONSDEV,		'C' },
23		{ CON_BOOT,		'B' },
24		{ CON_PRINTBUFFER,	'p' },
25		{ CON_BRL,		'b' },
26		{ CON_ANYTIME,		'a' },
27	};
28	char flags[ARRAY_SIZE(con_flags) + 1];
29	struct console *con = v;
30	unsigned int a;
 
31	dev_t dev = 0;
32
33	if (con->device) {
34		const struct tty_driver *driver;
35		int index;
36		driver = con->device(con, &index);
37		if (driver) {
38			dev = MKDEV(driver->major, driver->minor_start);
39			dev += index;
40		}
41	}
42
43	for (a = 0; a < ARRAY_SIZE(con_flags); a++)
44		flags[a] = (con->flags & con_flags[a].flag) ?
45			con_flags[a].name : ' ';
46	flags[a] = 0;
47
48	seq_setwidth(m, 21 - 1);
49	seq_printf(m, "%s%d", con->name, con->index);
50	seq_pad(m, ' ');
51	seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-',
 
52			con->write ? 'W' : '-', con->unblank ? 'U' : '-',
53			flags);
54	if (dev)
55		seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
56
57	seq_putc(m, '\n');
 
58	return 0;
59}
60
61static void *c_start(struct seq_file *m, loff_t *pos)
62{
63	struct console *con;
64	loff_t off = 0;
65
66	console_lock();
67	for_each_console(con)
68		if (off++ == *pos)
69			break;
70
71	return con;
72}
73
74static void *c_next(struct seq_file *m, void *v, loff_t *pos)
75{
76	struct console *con = v;
77	++*pos;
78	return con->next;
79}
80
81static void c_stop(struct seq_file *m, void *v)
82{
83	console_unlock();
84}
85
86static const struct seq_operations consoles_op = {
87	.start	= c_start,
88	.next	= c_next,
89	.stop	= c_stop,
90	.show	= show_console_dev
91};
92
 
 
 
 
 
 
 
 
 
 
 
 
93static int __init proc_consoles_init(void)
94{
95	proc_create_seq("consoles", 0, NULL, &consoles_op);
96	return 0;
97}
98fs_initcall(proc_consoles_init);