Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / fs / proc / consoles.c

diff --git a/fs/proc/consoles.c b/fs/proc/consoles.c
new file mode 100644 (file)
index 0000000..b701eaa
--- /dev/null
+++ b/fs/proc/consoles.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2010 Werner Fink, Jiri Slaby
+ *
+ * Licensed under GPLv2
+ */
+
+#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;
+       int len;
+       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_printf(m, "%s%d%n", con->name, con->index, &len);
+       len = 21 - len;
+       if (len < 1)
+               len = 1;
+       seq_printf(m, "%*c%c%c%c (%s)", len, ' ', con->read ? 'R' : '-',
+                       con->write ? 'W' : '-', con->unblank ? 'U' : '-',
+                       flags);
+       if (dev)
+               seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
+
+       seq_printf(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 consoles_open(struct inode *inode, struct file *file)
+{
+       return seq_open(file, &consoles_op);
+}
+
+static const struct file_operations proc_consoles_operations = {
+       .open           = consoles_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = seq_release,
+};
+
+static int __init proc_consoles_init(void)
+{
+       proc_create("consoles", 0, NULL, &proc_consoles_operations);
+       return 0;
+}
+module_init(proc_consoles_init);