]> nv-tegra.nvidia Code Review - linux-2.6.git/commit
SEND_SIG_NOINFO: set si_pid to tgid instead of pid
authorSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Tue, 6 Jan 2009 22:42:46 +0000 (14:42 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 6 Jan 2009 23:59:29 +0000 (15:59 -0800)
commit9cd4fd10437dda6b520cb1410b28f36967a34de8
tree1a1d5eaa0d650c1efe0e63dbadb9674cac209d9d
parent09bca05c90c639f57aae057e0c28f287e61f5a07
SEND_SIG_NOINFO: set si_pid to tgid instead of pid

POSIX requires the si_pid to be the process id of the sender, so ->si_pid
should really be set to 'tgid'.  This change does have following changes
in behavior:

- When sending pdeath_signal on re-parent to a sub-thread, ->si_pid
  cannot be used to identify the thread that did the re-parent since
  it will now show the tgid instead of thread id.

- A multi-threaded application that expects to find the specific
  thread that encountered a SIGPIPE using the ->si_pid will now
  break.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Acked-By: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/signal.c