tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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);