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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | /* * proc_tty.c -- handles /proc/tty * * Copyright 1997, Theodore Ts'o */ #include <asm/uaccess.h> #include <linux/module.h> #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) { struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers); 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) { mutex_lock(&tty_mutex); return seq_list_start(&tty_drivers, *pos); } static void *t_next(struct seq_file *m, void *v, loff_t *pos) { return seq_list_next(v, &tty_drivers, pos); } static void t_stop(struct seq_file *m, void *v) { mutex_unlock(&tty_mutex); } static const struct seq_operations tty_drivers_op = { .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); } static const struct file_operations proc_tty_drivers_operations = { .open = tty_drivers_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; /* * 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->ops->read_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->ops->read_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. */ proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL); proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops); proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations); } |