pty: show associative slave of ptmx in fdinfo

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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>

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Masatake YAMATO 2017-07-18 06:27:59 +09:00 • committed by Greg Kroah-Hartman

parent 199e717f25

commit d01c3289e7

3 changed files with 18 additions and 1 deletions

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include/linux/tty_driver.h

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