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pty: Add debug message for ptmx open 

Opens of /dev/ptmx don't use tty_open() so debug messages are
not printed for those opens; print a debug message with the
open count (which must always be 1) if TTY_DEBUG_HANGUP is defined.

NB: Each tty core source file undefs support for debug messages.
The relevant source file must be patched/edited to enable these
messages.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-07-12 22:49:13 -04:00 committed by Greg Kroah-Hartman
parent fb6edc9115
commit d684779335
1 changed files with 8 additions and 0 deletions
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8
drivers/tty/pty.c
View File

@ -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: