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| author | Peter Hurley | 2015-07-13 04:49:13 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2015-07-24 03:37:32 +0200 |
| commit | d684779335856d8177514b42a801d46088d897b0 (patch) | |
| tree | 2cd89c4fe5cb8317b6ae6aaf6322775d7439d689 /drivers/tty | |
| parent | tty: core: Improve ldisc debug messages (diff) | |
| download | kernel-qcow2-linux-d684779335856d8177514b42a801d46088d897b0.tar.gz kernel-qcow2-linux-d684779335856d8177514b42a801d46088d897b0.tar.xz kernel-qcow2-linux-d684779335856d8177514b42a801d46088d897b0.zip | |
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/pty.c | 8 |
1 files changed, 8 insertions, 0 deletions
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 <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: |