1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2010 Werner Fink, Jiri Slaby
*/
#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/tty_driver.h>
/*
* This is handler for /proc/consoles
*/
static int show_console_dev(struct seq_file *m, void *v)
{
static const struct {
short flag;
char name;
} con_flags[] = {
{ CON_ENABLED, 'E' },
{ CON_CONSDEV, 'C' },
{ CON_BOOT, 'B' },
{ CON_PRINTBUFFER, 'p' },
{ CON_BRL, 'b' },
{ CON_ANYTIME, 'a' },
};
char flags[ARRAY_SIZE(con_flags) + 1];
struct console *con = v;
unsigned int a;
dev_t dev = 0;
if (con->device) {
const struct tty_driver *driver;
int index;
driver = con->device(con, &index);
if (driver) {
dev = MKDEV(driver->major, driver->minor_start);
dev += index;
}
}
for (a = 0; a < ARRAY_SIZE(con_flags); a++)
flags[a] = (con->flags & con_flags[a].flag) ?
con_flags[a].name : ' ';
flags[a] = 0;
seq_setwidth(m, 21 - 1);
seq_printf(m, "%s%d", con->name, con->index);
seq_pad(m, ' ');
seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-',
con->write ? 'W' : '-', con->unblank ? 'U' : '-',
flags);
if (dev)
seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
seq_putc(m, '\n');
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
struct console *con;
loff_t off = 0;
console_lock();
for_each_console(con)
if (off++ == *pos)
break;
return con;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
struct console *con = v;
++*pos;
return hlist_entry_safe(con->node.next, struct console, node);
}
static void c_stop(struct seq_file *m, void *v)
{
console_unlock();
}
static const struct seq_operations consoles_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = show_console_dev
};
static int __init proc_consoles_init(void)
{
proc_create_seq("consoles", 0, NULL, &consoles_op);
return 0;
}
fs_initcall(proc_consoles_init);
|
