diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-02-12 00:53:00 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-12 09:48:32 -0800 |
| commit | ab521dc0f8e117fd808d3e425216864d60390500 (patch) | |
| tree | f9d6449c4d8c9508fd43edfe845108043e1536b2 /include/linux | |
| parent | 3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474 (diff) | |
[PATCH] tty: update the tty layer to work with struct pid
Of kernel subsystems that work with pids the tty layer is probably the largest
consumer. But it has the nice virtue that the assiation with a session only
lasts until the session leader exits. Which means that no reference counting
is required. So using struct pid winds up being a simple optimization to
avoid hash table lookups.
In the long term the use of pid_nr also ensures that when we have multiple pid
spaces mixed everything will work correctly.
Signed-off-by: Eric W. Biederman <eric@maxwell.lnxi.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/init_task.h | 2 | ||||
| -rw-r--r-- | include/linux/sched.h | 2 | ||||
| -rw-r--r-- | include/linux/tty.h | 4 |
3 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 6383d2d83bb..a2d95ff50e9 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -66,7 +66,7 @@ .cpu_timers = INIT_CPU_TIMERS(sig.cpu_timers), \ .rlim = INIT_RLIMITS, \ .pgrp = 1, \ - .tty_old_pgrp = 0, \ + .tty_old_pgrp = NULL, \ { .__session = 1}, \ } diff --git a/include/linux/sched.h b/include/linux/sched.h index 76c8e2dc48d..39d40c51853 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -436,7 +436,7 @@ struct signal_struct { /* job control IDs */ pid_t pgrp; - pid_t tty_old_pgrp; + struct pid *tty_old_pgrp; union { pid_t session __deprecated; diff --git a/include/linux/tty.h b/include/linux/tty.h index d0e03c4a71b..dee72b9a20f 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -197,8 +197,8 @@ struct tty_struct { struct mutex termios_mutex; struct ktermios *termios, *termios_locked; char name[64]; - int pgrp; - int session; + struct pid *pgrp; + struct pid *session; unsigned long flags; int count; struct winsize winsize; |