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authorLinus Torvalds <torvalds@linux-foundation.org>2010-10-22 19:59:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-22 19:59:04 -0700
commit73ecf3a6e3f0206bf56a0fefe3b3eda042fb7034 (patch)
tree866f0ebb2b148479e93b5ac955097b1cc94ceb4e /fs/proc
parentb9da0571050c09863e59f94d0b8594a290d61b88 (diff)
parentcd3ecad19aea8debae9a48b53de2ec7a571f24e9 (diff)
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Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (49 commits) serial8250: ratelimit "too much work" error serial: bfin_sport_uart: speed up sport RX sample rate to be 3% faster serial: abstraction for 8250 legacy ports serial/imx: check that the buffer is non-empty before sending it out serial: mfd: add more baud rates support jsm: Remove the uart port on errors Alchemy: Add UART PM methods. 8250: allow platforms to override PM hook. altera_uart: Don't use plain integer as NULL pointer altera_uart: Fix missing prototype for registering an early console altera_uart: Fixup type usage of port flags altera_uart: Make it possible to use Altera UART and 8250 ports together altera_uart: Add support for different address strides altera_uart: Add support for getting mapbase and IRQ from resources altera_uart: Add support for polling mode (IRQ-less) serial: Factor out uart_poll_timeout() from 8250 driver serial: mark the 8250 driver as maintained serial: 8250: Don't delay after transmitter is ready. tty: MAINTAINERS: add drivers/serial/jsm/ as maintained driver vcs: invoke the vt update callback when /dev/vcs* is written to ...
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/proc_tty.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/fs/proc/proc_tty.c b/fs/proc/proc_tty.c
index 83adcc86943..dc44f94022f 100644
--- a/fs/proc/proc_tty.c
+++ b/fs/proc/proc_tty.c
@@ -12,7 +12,10 @@
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/console.h>
#include <linux/seq_file.h>
+#include <linux/fdtable.h>
#include <linux/bitops.h>
/*
@@ -137,6 +140,160 @@ static const struct file_operations proc_tty_drivers_operations = {
};
/*
+ * The device ID of file descriptor 0 of the current reading
+ * task if a character device...
+ */
+static dev_t current_dev;
+
+/*
+ * This is the handler for /proc/tty/consoles
+ */
+static int show_console_dev(struct seq_file *m, void *v)
+{
+ const struct tty_driver *driver;
+ struct console *con;
+ int index, len;
+ char flags[10];
+ dev_t dev;
+
+ if (v == SEQ_START_TOKEN)
+ return 0;
+ con = (struct console *)v;
+ if (!con)
+ return 0;
+ driver = con->device(con, &index);
+ if (!driver)
+ return 0;
+ dev = MKDEV(driver->major, driver->minor_start) + index;
+
+ index = 0;
+ if (con->flags & CON_ENABLED)
+ flags[index++] = 'E';
+ if (con->flags & CON_CONSDEV)
+ flags[index++] = 'C';
+ if (con->flags & CON_BOOT)
+ flags[index++] = 'B';
+ if (con->flags & CON_PRINTBUFFER)
+ flags[index++] = 'p';
+ if (con->flags & CON_BRL)
+ flags[index++] = 'b';
+ if (con->flags & CON_ANYTIME)
+ flags[index++] = 'a';
+ if (current_dev == dev)
+ flags[index++] = '*';
+ flags[index] = 0;
+
+ seq_printf(m, "%s%d%n", con->name, con->index, &len);
+ len = 21 - len;
+ if (len < 1)
+ len = 1;
+ seq_printf(m, "%*c", len, ' ');
+ seq_printf(m, "%c%c%c (%s)%n", con->read ? 'R' : '-',
+ con->write ? 'W' : '-', con->unblank ? 'U' : '-',
+ flags, &len);
+ len = 13 - len;
+ if (len < 1)
+ len = 1;
+ seq_printf(m, "%*c%4d:%d\n", len, ' ', MAJOR(dev), MINOR(dev));
+
+ return 0;
+}
+
+/* iterator for consoles */
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ struct console *con;
+ loff_t off = 0;
+
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
+
+ acquire_console_sem();
+ for (con = console_drivers; con; con = con->next) {
+ if (!con->device)
+ continue;
+ if (++off == *pos)
+ break;
+ }
+ release_console_sem();
+
+ return con;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct console *con;
+
+ acquire_console_sem();
+ if (v == SEQ_START_TOKEN)
+ con = console_drivers;
+ else
+ con = ((struct console *)v)->next;
+ for (; con; con = con->next) {
+ if (!con->device)
+ continue;
+ ++*pos;
+ break;
+ }
+ release_console_sem();
+
+ return con;
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+static const struct seq_operations tty_consoles_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_console_dev
+};
+
+/*
+ * Used for open /proc/tty/consoles. Before this detect
+ * the device ID of file descriptor 0 of the current
+ * reading task if a character device...
+ */
+static int tty_consoles_open(struct inode *inode, struct file *file)
+{
+ struct files_struct *curfiles;
+
+ current_dev = 0;
+ curfiles = get_files_struct(current);
+ if (curfiles) {
+ const struct file *curfp;
+ spin_lock(&curfiles->file_lock);
+ curfp = fcheck_files(curfiles, 0);
+ if (curfp && curfp->private_data) {
+ const struct inode *inode;
+ dget(curfp->f_dentry);
+ inode = curfp->f_dentry->d_inode;
+ if (S_ISCHR(inode->i_mode)) {
+ struct tty_struct *tty;
+ tty = (struct tty_struct *)curfp->private_data;
+ if (tty && tty->magic == TTY_MAGIC) {
+ tty = tty_pair_get_tty(tty);
+ current_dev = tty_devnum(tty);
+ }
+ }
+ dput(curfp->f_dentry);
+ }
+ spin_unlock(&curfiles->file_lock);
+ put_files_struct(curfiles);
+ }
+ return seq_open(file, &tty_consoles_op);
+}
+
+static const struct file_operations proc_tty_consoles_operations = {
+ .open = tty_consoles_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+/*
* This function is called by tty_register_driver() to handle
* registering the driver's /proc handler into /proc/tty/driver/<foo>
*/
@@ -186,4 +343,5 @@ void __init proc_tty_init(void)
proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL);
proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
+ proc_create("tty/consoles", 0, NULL, &proc_tty_consoles_operations);
}