Messages in this thread Patch in this message | | | From | Peter Hurley <> | Subject | [PATCH 7/7] pty: Add debug message for ptmx open | Date | Sun, 12 Jul 2015 22:49:13 -0400 |
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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> --- drivers/tty/pty.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index 4d5e840..4d5937c 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: -- 2.4.5
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