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| // 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 con->next;
| }
|
| 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);
|
|
