diff options
| author | Masatake YAMATO <yamato@redhat.com> | 2017-07-18 00:27:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-28 21:51:23 +0300 |
| commit | d01c3289e7d68162e32bc08c2b65dd1a216a7ef8 (patch) | |
| tree | 34177b1e85f857b838fa75b08153d091472eb775 /include | |
| parent | 199e717f252be0e31c97b9c7861dd6e2abfaa936 (diff) | |
| download | linux-d01c3289e7d68162e32bc08c2b65dd1a216a7ef8.tar.xz | |
pty: show associative slave of ptmx in fdinfo
This patch adds "tty-index" field to /proc/PID/fdinfo/N if N
specifies /dev/ptmx. The field shows the index of associative
slave pts.
Though a minor number is given for each pts instance, ptmx is not.
It means there is no way in user-space to know the association between
file descriptors for pts/n and ptmx. (n = 0, 1, ...)
This is different from pipe. About pipe such association can be solved
by inode of pipefs.
Providing the way to know the association between pts/n and ptmx helps
users understand the status of running system. lsof can utilize this field.
Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tty_driver.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h index 00b2213f6a35..fcdc0f5d9098 100644 --- a/include/linux/tty_driver.h +++ b/include/linux/tty_driver.h @@ -243,6 +243,7 @@ #include <linux/list.h> #include <linux/cdev.h> #include <linux/termios.h> +#include <linux/seq_file.h> struct tty_struct; struct tty_driver; @@ -285,6 +286,7 @@ struct tty_operations { int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew); int (*get_icount)(struct tty_struct *tty, struct serial_icounter_struct *icount); + void (*show_fdinfo)(struct tty_struct *tty, struct seq_file *m); #ifdef CONFIG_CONSOLE_POLL int (*poll_init)(struct tty_driver *driver, int line, char *options); int (*poll_get_char)(struct tty_driver *driver, int line); |