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path: root/drivers/tty/pty.c
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Diffstat (limited to 'drivers/tty/pty.c')
-rw-r--r--drivers/tty/pty.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 4d5e84097..4d5937c18 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -26,6 +26,12 @@
#include <linux/mutex.h>
#include <linux/poll.h>
+#undef TTY_DEBUG_HANGUP
+#ifdef TTY_DEBUG_HANGUP
+# define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
+#else
+# define tty_debug_hangup(tty, f, args...) do {} while (0)
+#endif
#ifdef CONFIG_UNIX98_PTYS
static struct tty_driver *ptm_driver;
@@ -779,6 +785,8 @@ static int ptmx_open(struct inode *inode, struct file *filp)
if (retval)
goto err_release;
+ tty_debug_hangup(tty, "(tty count=%d)\n", tty->count);
+
tty_unlock(tty);
return 0;
err_release: