Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 242 insertions, 0 deletions

diff --git a/fs/proc/proc_tty.c b/fs/proc/proc_tty.c
new file mode 100644
index 000000000000..15c4455b09eb
--- /dev/null
+++ b/fs/proc/proc_tty.c
@@ -0,0 +1,242 @@
+/*
+ * proc_tty.c -- handles /proc/tty
+ *
+ * Copyright 1997, Theodore Ts'o
+ */
+
+#include <asm/uaccess.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>
+
+static int tty_ldiscs_read_proc(char *page, char **start, off_t off,
+                                int count, int *eof, void *data);
+
+/*
+ * 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 = v;
+        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)
+{
+        struct list_head *p;
+        loff_t l = *pos;
+        list_for_each(p, &tty_drivers)
+                if (!l--)
+                        return list_entry(p, struct tty_driver, tty_drivers);
+        return NULL;
+}
+
+static void *t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        struct list_head *p = ((struct tty_driver *)v)->tty_drivers.next;
+        (*pos)++;
+        return p==&tty_drivers ? NULL :
+                        list_entry(p, struct tty_driver, tty_drivers);
+}
+
+static void t_stop(struct seq_file *m, void *v)
+{
+}
+
+static 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 struct file_operations proc_tty_drivers_operations = {
+        .open           = tty_drivers_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+
+/*
+ * This is the handler for /proc/tty/ldiscs
+ */
+static int tty_ldiscs_read_proc(char *page, char **start, off_t off,
+                                int count, int *eof, void *data)
+{
+        int     i;
+        int     len = 0;
+        off_t   begin = 0;
+        struct tty_ldisc *ld;
+        
+        for (i=0; i < NR_LDISCS; i++) {
+                ld = tty_ldisc_get(i);
+                if (ld == NULL)
+                        continue;
+                len += sprintf(page+len, "%-10s %2d\n",
+                               ld->name ? ld->name : "???", i);
+                tty_ldisc_put(i);
+                if (len+begin > off+count)
+                        break;
+                if (len+begin < off) {
+                        begin += len;
+                        len = 0;
+                }
+        }
+        if (i >= NR_LDISCS)
+                *eof = 1;
+        if (off >= len+begin)
+                return 0;
+        *start = page + (off-begin);
+        return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/*
+ * 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->read_proc && !driver->write_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->read_proc;
+        ent->write_proc = driver->write_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)
+{
+        struct proc_dir_entry *entry;
+        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);
+
+        create_proc_read_entry("tty/ldiscs", 0, NULL, tty_ldiscs_read_proc, NULL);
+        entry = create_proc_entry("tty/drivers", 0, NULL);
+        if (entry)
+                entry->proc_fops = &proc_tty_drivers_operations;
+}