[PATCH] pty: show associative slave of ptmx in fdinfo

[Masatake YAMATO]

This patch adds "tty-index" field to /proc/PID/fdinfo/N if N
specifies /dev/ptmx. The field shows the index of associative
slave pts.

Though a minor number is given for each pts instance, ptmx is not.
It means there is no way in user-space to know the association between
file descriptors for pts/n and ptmx. (n = 0, 1, ...)

This is different from pipe. About pipe such association can be solved
by inode of pipefs.

Providing the way to know the association between pts/n and ptmx helps
users understand the status of running system. lsof can utilize this field.

Signed-off-by: Masatake YAMATO <yamato@xxxxxxxxxx>
---
 drivers/tty/pty.c          | 12 +++++++++++-
 drivers/tty/tty_io.c       | 14 ++++++++++++++
 include/linux/tty_driver.h |  5 +++++
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index a23fa5e..e7c9b17 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -674,6 +674,13 @@ static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
 	}
 }
 
+#ifdef CONFIG_PROC_FS
+static void pty_show_fdinfo(struct tty_struct *tty, struct seq_file *m)
+{
+	seq_printf(m, "tty-index:\t%d\n", tty->index);
+}
+#endif
+
 static const struct tty_operations ptm_unix98_ops = {
 	.lookup = ptm_unix98_lookup,
 	.install = pty_unix98_install,
@@ -687,7 +694,10 @@ static const struct tty_operations ptm_unix98_ops = {
 	.unthrottle = pty_unthrottle,
 	.ioctl = pty_unix98_ioctl,
 	.resize = pty_resize,
-	.cleanup = pty_cleanup
+	.cleanup = pty_cleanup,
+#ifdef CONFIG_PROC_FS
+	.show_fdinfo = pty_show_fdinfo,
+#endif
 };
 
 static const struct tty_operations pty_unix98_ops = {
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 734a635..6c0f180 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -105,6 +105,8 @@
 #include <linux/kmod.h>
 #include <linux/nsproxy.h>
 
+#include <linux/seq_file.h>
+
 #undef TTY_DEBUG_HANGUP
 #ifdef TTY_DEBUG_HANGUP
 # define tty_debug_hangup(tty, f, args...)	tty_debug(tty, f, ##args)
@@ -470,6 +472,15 @@ static int hung_up_tty_fasync(int fd, struct file *file, int on)
 	return -ENOTTY;
 }
 
+#ifdef CONFIG_PROC_FS
+static void tty_show_fdinfo(struct seq_file *m, struct file *file)
+{
+	struct tty_struct *tty = file_tty(file);
+	if (tty && tty->ops && tty->ops->show_fdinfo)
+		tty->ops->show_fdinfo (tty, m);
+}
+#endif
+
 static const struct file_operations tty_fops = {
 	.llseek		= no_llseek,
 	.read		= tty_read,
@@ -480,6 +491,9 @@ static const struct file_operations tty_fops = {
 	.open		= tty_open,
 	.release	= tty_release,
 	.fasync		= tty_fasync,
+#ifdef CONFIG_PROC_FS
+	.show_fdinfo	= tty_show_fdinfo,
+#endif
 };
 
 static const struct file_operations console_fops = {
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index b742b5e..499823d 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -243,6 +243,7 @@
 #include <linux/list.h>
 #include <linux/cdev.h>
 #include <linux/termios.h>
+#include <linux/seq_file.h>
 
 struct tty_struct;
 struct tty_driver;
@@ -285,6 +286,10 @@ struct tty_operations {
 	int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew);
 	int (*get_icount)(struct tty_struct *tty,
 				struct serial_icounter_struct *icount);
+#ifdef CONFIG_PROC_FS
+	void (*show_fdinfo)(struct tty_struct *tty, struct seq_file *m);
+#endif
+
 #ifdef CONFIG_CONSOLE_POLL
 	int (*poll_init)(struct tty_driver *driver, int line, char *options);
 	int (*poll_get_char)(struct tty_driver *driver, int line);
-- 
2.9.3