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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178// SPDX-License-Identifier: GPL-2.0/* * proc_tty.c -- handles /proc/tty * * Copyright 1997, Theodore Ts'o */#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>#include "internal.h"
/* * The /proc/tty directory inodes... */static struct proc_dir_entry *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_puts(m, "system"); if (p->subtype == SYSTEM_TYPE_TTY) seq_puts(m, ":/dev/tty"); else if (p->subtype == SYSTEM_TYPE_SYSCONS) seq_puts(m, ":console"); else if (p->subtype == SYSTEM_TYPE_CONSOLE) seq_puts(m, ":vtmaster"); break; case TTY_DRIVER_TYPE_CONSOLE: seq_puts(m, "console"); break; case TTY_DRIVER_TYPE_SERIAL: seq_puts(m, "serial"); break; case TTY_DRIVER_TYPE_PTY: if (p->subtype == PTY_TYPE_MASTER) seq_puts(m, "pty:master"); else if (p->subtype == PTY_TYPE_SLAVE) seq_puts(m, "pty:slave"); else seq_puts(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_puts(m, "system:/dev/tty\n"); seq_printf(m, "%-20s /dev/%-8s ", "/dev/console", "console"); seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 1); seq_puts(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_puts(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_puts(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};
/* * 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->driver_name || driver->proc_entry || !driver->ops->proc_show) return;
ent = proc_create_single_data(driver->driver_name, 0, proc_tty_driver, driver->ops->proc_show, 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(ent->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_mkdir("tty/ldisc", NULL); /* Preserved: it's userspace visible */ /* * /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_seq("tty/ldiscs", 0, NULL, &tty_ldiscs_seq_ops); proc_create_seq("tty/drivers", 0, NULL, &tty_drivers_op);}