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https://github.com/edk2-porting/linux-next.git
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76df0c25d0
Move code around so as to reduce the number of forward-declarations. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
234 lines
5.6 KiB
C
234 lines
5.6 KiB
C
/*
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* proc_tty.c -- handles /proc/tty
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*
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* Copyright 1997, Theodore Ts'o
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*/
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#include <asm/uaccess.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/tty.h>
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#include <linux/seq_file.h>
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#include <linux/bitops.h>
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/*
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* The /proc/tty directory inodes...
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*/
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static struct proc_dir_entry *proc_tty_ldisc, *proc_tty_driver;
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/*
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* This is the handler for /proc/tty/drivers
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*/
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static void show_tty_range(struct seq_file *m, struct tty_driver *p,
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dev_t from, int num)
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{
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seq_printf(m, "%-20s ", p->driver_name ? p->driver_name : "unknown");
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seq_printf(m, "/dev/%-8s ", p->name);
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if (p->num > 1) {
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seq_printf(m, "%3d %d-%d ", MAJOR(from), MINOR(from),
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MINOR(from) + num - 1);
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} else {
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seq_printf(m, "%3d %7d ", MAJOR(from), MINOR(from));
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}
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switch (p->type) {
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case TTY_DRIVER_TYPE_SYSTEM:
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seq_printf(m, "system");
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if (p->subtype == SYSTEM_TYPE_TTY)
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seq_printf(m, ":/dev/tty");
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else if (p->subtype == SYSTEM_TYPE_SYSCONS)
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seq_printf(m, ":console");
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else if (p->subtype == SYSTEM_TYPE_CONSOLE)
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seq_printf(m, ":vtmaster");
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break;
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case TTY_DRIVER_TYPE_CONSOLE:
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seq_printf(m, "console");
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break;
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case TTY_DRIVER_TYPE_SERIAL:
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seq_printf(m, "serial");
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break;
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case TTY_DRIVER_TYPE_PTY:
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if (p->subtype == PTY_TYPE_MASTER)
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seq_printf(m, "pty:master");
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else if (p->subtype == PTY_TYPE_SLAVE)
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seq_printf(m, "pty:slave");
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else
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seq_printf(m, "pty");
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break;
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default:
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seq_printf(m, "type:%d.%d", p->type, p->subtype);
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}
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seq_putc(m, '\n');
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}
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static int show_tty_driver(struct seq_file *m, void *v)
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{
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struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers);
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dev_t from = MKDEV(p->major, p->minor_start);
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dev_t to = from + p->num;
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if (&p->tty_drivers == tty_drivers.next) {
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/* pseudo-drivers first */
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seq_printf(m, "%-20s /dev/%-8s ", "/dev/tty", "tty");
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seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 0);
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seq_printf(m, "system:/dev/tty\n");
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seq_printf(m, "%-20s /dev/%-8s ", "/dev/console", "console");
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seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 1);
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seq_printf(m, "system:console\n");
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#ifdef CONFIG_UNIX98_PTYS
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seq_printf(m, "%-20s /dev/%-8s ", "/dev/ptmx", "ptmx");
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seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 2);
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seq_printf(m, "system\n");
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#endif
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#ifdef CONFIG_VT
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seq_printf(m, "%-20s /dev/%-8s ", "/dev/vc/0", "vc/0");
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seq_printf(m, "%3d %7d ", TTY_MAJOR, 0);
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seq_printf(m, "system:vtmaster\n");
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#endif
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}
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while (MAJOR(from) < MAJOR(to)) {
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dev_t next = MKDEV(MAJOR(from)+1, 0);
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show_tty_range(m, p, from, next - from);
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from = next;
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}
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if (from != to)
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show_tty_range(m, p, from, to - from);
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return 0;
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}
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/* iterator */
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static void *t_start(struct seq_file *m, loff_t *pos)
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{
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mutex_lock(&tty_mutex);
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return seq_list_start(&tty_drivers, *pos);
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}
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static void *t_next(struct seq_file *m, void *v, loff_t *pos)
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{
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return seq_list_next(v, &tty_drivers, pos);
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}
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static void t_stop(struct seq_file *m, void *v)
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{
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mutex_unlock(&tty_mutex);
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}
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static struct seq_operations tty_drivers_op = {
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.start = t_start,
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.next = t_next,
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.stop = t_stop,
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.show = show_tty_driver
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};
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static int tty_drivers_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &tty_drivers_op);
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}
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static const struct file_operations proc_tty_drivers_operations = {
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.open = tty_drivers_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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/*
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* This is the handler for /proc/tty/ldiscs
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*/
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static int tty_ldiscs_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int i;
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int len = 0;
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off_t begin = 0;
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struct tty_ldisc *ld;
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for (i=0; i < NR_LDISCS; i++) {
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ld = tty_ldisc_get(i);
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if (ld == NULL)
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continue;
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len += sprintf(page+len, "%-10s %2d\n",
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ld->name ? ld->name : "???", i);
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tty_ldisc_put(i);
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if (len+begin > off+count)
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break;
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if (len+begin < off) {
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begin += len;
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len = 0;
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}
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}
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if (i >= NR_LDISCS)
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*eof = 1;
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if (off >= len+begin)
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return 0;
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*start = page + (off-begin);
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return ((count < begin+len-off) ? count : begin+len-off);
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}
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/*
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* This function is called by tty_register_driver() to handle
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* registering the driver's /proc handler into /proc/tty/driver/<foo>
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*/
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void proc_tty_register_driver(struct tty_driver *driver)
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{
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struct proc_dir_entry *ent;
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if ((!driver->read_proc && !driver->write_proc) ||
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!driver->driver_name ||
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driver->proc_entry)
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return;
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ent = create_proc_entry(driver->driver_name, 0, proc_tty_driver);
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if (!ent)
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return;
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ent->read_proc = driver->read_proc;
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ent->write_proc = driver->write_proc;
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ent->owner = driver->owner;
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ent->data = driver;
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driver->proc_entry = ent;
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}
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/*
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* This function is called by tty_unregister_driver()
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*/
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void proc_tty_unregister_driver(struct tty_driver *driver)
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{
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struct proc_dir_entry *ent;
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ent = driver->proc_entry;
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if (!ent)
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return;
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remove_proc_entry(driver->driver_name, proc_tty_driver);
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driver->proc_entry = NULL;
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}
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/*
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* Called by proc_root_init() to initialize the /proc/tty subtree
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*/
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void __init proc_tty_init(void)
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{
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struct proc_dir_entry *entry;
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if (!proc_mkdir("tty", NULL))
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return;
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proc_tty_ldisc = proc_mkdir("tty/ldisc", NULL);
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/*
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* /proc/tty/driver/serial reveals the exact character counts for
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* serial links which is just too easy to abuse for inferring
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* password lengths and inter-keystroke timings during password
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* entry.
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*/
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proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR | S_IXUSR, NULL);
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create_proc_read_entry("tty/ldiscs", 0, NULL, tty_ldiscs_read_proc, NULL);
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entry = create_proc_entry("tty/drivers", 0, NULL);
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if (entry)
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entry->proc_fops = &proc_tty_drivers_operations;
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}
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