![Richard Weinberger](/assets/img/avatar_default.png)
As we setup the SIGWINCH handler in tty_port_operations->activate it makes sense to tear down it in ->destruct. Signed-off-by: Richard Weinberger <richard@nod.at>
200 lines
4.8 KiB
C
200 lines
4.8 KiB
C
/*
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* Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <linux/posix_types.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/types.h>
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#include <linux/major.h>
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#include <linux/kdev_t.h>
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#include <linux/console.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/hardirq.h>
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#include <asm/current.h>
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#include <asm/irq.h>
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#include "stdio_console.h"
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#include "chan.h"
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#include <irq_user.h>
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#include "mconsole_kern.h"
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#include <init.h>
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#define MAX_TTYS (16)
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static void stdio_announce(char *dev_name, int dev)
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{
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printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
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dev_name);
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}
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/* Almost const, except that xterm_title may be changed in an initcall */
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static struct chan_opts opts = {
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.announce = stdio_announce,
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.xterm_title = "Virtual Console #%d",
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.raw = 1,
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};
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static int con_config(char *str, char **error_out);
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static int con_get_config(char *dev, char *str, int size, char **error_out);
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static int con_remove(int n, char **con_remove);
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/* Const, except for .mc.list */
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static struct line_driver driver = {
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.name = "UML console",
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.device_name = "tty",
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.major = TTY_MAJOR,
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.minor_start = 0,
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.type = TTY_DRIVER_TYPE_CONSOLE,
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.subtype = SYSTEM_TYPE_CONSOLE,
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.read_irq = CONSOLE_IRQ,
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.read_irq_name = "console",
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.write_irq = CONSOLE_WRITE_IRQ,
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.write_irq_name = "console-write",
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.mc = {
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.list = LIST_HEAD_INIT(driver.mc.list),
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.name = "con",
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.config = con_config,
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.get_config = con_get_config,
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.id = line_id,
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.remove = con_remove,
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},
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};
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/* The array is initialized by line_init, at initcall time. The
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* elements are locked individually as needed.
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*/
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static char *vt_conf[MAX_TTYS];
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static char *def_conf;
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static struct line vts[MAX_TTYS];
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static int con_config(char *str, char **error_out)
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{
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return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
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}
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static int con_get_config(char *dev, char *str, int size, char **error_out)
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{
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return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
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}
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static int con_remove(int n, char **error_out)
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{
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return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
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}
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/* Set in an initcall, checked in an exitcall */
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static int con_init_done = 0;
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static int con_install(struct tty_driver *driver, struct tty_struct *tty)
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{
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return line_install(driver, tty, &vts[tty->index]);
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}
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static const struct tty_operations console_ops = {
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.open = line_open,
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.install = con_install,
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.close = line_close,
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.write = line_write,
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.put_char = line_put_char,
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.write_room = line_write_room,
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.chars_in_buffer = line_chars_in_buffer,
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.flush_buffer = line_flush_buffer,
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.flush_chars = line_flush_chars,
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.set_termios = line_set_termios,
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.throttle = line_throttle,
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.unthrottle = line_unthrottle,
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.hangup = line_hangup,
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};
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static void uml_console_write(struct console *console, const char *string,
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unsigned len)
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{
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struct line *line = &vts[console->index];
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unsigned long flags;
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spin_lock_irqsave(&line->lock, flags);
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console_write_chan(line->chan_out, string, len);
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spin_unlock_irqrestore(&line->lock, flags);
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}
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static struct tty_driver *uml_console_device(struct console *c, int *index)
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{
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*index = c->index;
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return driver.driver;
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}
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static int uml_console_setup(struct console *co, char *options)
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{
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struct line *line = &vts[co->index];
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return console_open_chan(line, co);
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}
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/* No locking for register_console call - relies on single-threaded initcalls */
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static struct console stdiocons = {
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.name = "tty",
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.write = uml_console_write,
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.device = uml_console_device,
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.setup = uml_console_setup,
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.flags = CON_PRINTBUFFER|CON_ANYTIME,
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.index = -1,
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};
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static int stdio_init(void)
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{
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char *new_title;
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int err;
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int i;
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err = register_lines(&driver, &console_ops, vts,
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ARRAY_SIZE(vts));
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if (err)
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return err;
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printk(KERN_INFO "Initialized stdio console driver\n");
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new_title = add_xterm_umid(opts.xterm_title);
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if(new_title != NULL)
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opts.xterm_title = new_title;
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for (i = 0; i < MAX_TTYS; i++) {
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char *error;
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char *s = vt_conf[i];
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if (!s)
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s = def_conf;
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if (!s)
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s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
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if (setup_one_line(vts, i, s, &opts, &error))
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printk(KERN_ERR "setup_one_line failed for "
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"device %d : %s\n", i, error);
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}
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con_init_done = 1;
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register_console(&stdiocons);
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return 0;
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}
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late_initcall(stdio_init);
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static void console_exit(void)
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{
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if (!con_init_done)
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return;
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close_lines(vts, ARRAY_SIZE(vts));
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}
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__uml_exitcall(console_exit);
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static int console_chan_setup(char *str)
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{
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line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
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return 1;
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}
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__setup("con", console_chan_setup);
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__channel_help(console_chan_setup, "con");
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