From: Peter Hurley Date: Mon, 13 Jul 2015 02:49:13 +0000 (-0400) Subject: pty: Add debug message for ptmx open X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d684779335856d8177514b42a801d46088d897b0;p=linux-beck.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index 4d5e8409769c..4d5937c185c1 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -26,6 +26,12 @@ #include #include +#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: