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1 | /* |
2 | * proc_tty.c -- handles /proc/tty |
3 | * |
4 | * Copyright 1997, Theodore Ts'o |
5 | */ |
6 | |
7 | #include <asm/uaccess.h> |
8 | #include <linux/module.h> |
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 | |
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 | { |
69 | struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers); |
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 | { |
106 | mutex_lock(&tty_mutex); |
107 | return seq_list_start(&tty_drivers, *pos); |
108 | } |
109 | |
110 | static void *t_next(struct seq_file *m, void *v, loff_t *pos) |
111 | { |
112 | return seq_list_next(v, &tty_drivers, pos); |
113 | } |
114 | |
115 | static void t_stop(struct seq_file *m, void *v) |
116 | { |
117 | mutex_unlock(&tty_mutex); |
118 | } |
119 | |
120 | static const struct seq_operations tty_drivers_op = { |
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 | |
132 | static const struct file_operations proc_tty_drivers_operations = { |
133 | .open = tty_drivers_open, |
134 | .read = seq_read, |
135 | .llseek = seq_lseek, |
136 | .release = seq_release, |
137 | }; |
138 | |
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 | |
147 | if (!driver->driver_name || driver->proc_entry || |
148 | !driver->ops->proc_fops) |
149 | return; |
150 | |
151 | ent = proc_create_data(driver->driver_name, 0, proc_tty_driver, |
152 | driver->ops->proc_fops, driver); |
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 | { |
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 | */ |
186 | proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL); |
187 | proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops); |
188 | proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations); |
189 | } |
190 |
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