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authorOleg Nesterov <oleg@tv-sign.ru>2008-04-30 09:52:55 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 17:29:36 +0200
commit5fcd835bf8c2cde06404559b1904e2f1dfcb4567 (patch)
treec370d13b34d7c516c449427aebfde5bd29c83489 /kernel
parentsignals: change send_signal/do_send_sigqueue to take "boolean group" parameter (diff)
downloadlinux-5fcd835bf8c2cde06404559b1904e2f1dfcb4567.tar.xz
linux-5fcd835bf8c2cde06404559b1904e2f1dfcb4567.zip
signals: use __group_complete_signal() for the specific signals too
Based on Pavel Emelyanov's suggestion. Rename __group_complete_signal() to complete_signal() and use it to process the specific signals too. To do this we simply add the "int group" argument. This allows us to greatly simply the signal-sending code and adds a useful behaviour change. We can avoid the unneeded wakeups for the private signals because wants_signal() is more clever than sigismember(blocked), but more importantly we now take into account the fatal specific signals too. The latter allows us to kill some subtle checks in handle_stop_signal() and makes the specific/group signal's behaviour more consistent. For example, currently sigtimedwait(FATAL_SIGNAL) behaves differently depending on was the signal sent by kill() or tkill() if the signal was not blocked. And. This allows us to tweak/fix the behaviour when the specific signal is sent to the dying/dead ->group_leader. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/signal.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index f2fc3a9ea8fc..fc1cb03c241c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -673,8 +673,7 @@ static inline int wants_signal(int sig, struct task_struct *p)
return task_curr(p) || !signal_pending(p);
}
-static void
-__group_complete_signal(int sig, struct task_struct *p)
+static void complete_signal(int sig, struct task_struct *p, int group)
{
struct signal_struct *signal = p->signal;
struct task_struct *t;
@@ -687,7 +686,7 @@ __group_complete_signal(int sig, struct task_struct *p)
*/
if (wants_signal(sig, p))
t = p;
- else if (thread_group_empty(p))
+ else if (!group || thread_group_empty(p))
/*
* There is just one thread and it does not need to be woken.
* It will dequeue unblocked signals before it runs again.
@@ -871,8 +870,7 @@ specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t)
if (ret <= 0)
return ret;
- if (!sigismember(&t->blocked, sig))
- signal_wake_up(t, sig == SIGKILL);
+ complete_signal(sig, t, 0);
return 0;
}
@@ -930,7 +928,7 @@ __group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
if (ret <= 0)
return ret;
- __group_complete_signal(sig, p);
+ complete_signal(sig, p, 1);
return 0;
}
@@ -1309,8 +1307,7 @@ int send_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
ret = do_send_sigqueue(sig, q, p, 0);
- if (!sigismember(&p->blocked, sig))
- signal_wake_up(p, sig == SIGKILL);
+ complete_signal(sig, p, 0);
unlock_task_sighand(p, &flags);
out_err:
@@ -1330,7 +1327,7 @@ send_group_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
ret = do_send_sigqueue(sig, q, p, 1);
- __group_complete_signal(sig, p);
+ complete_signal(sig, p, 1);
spin_unlock_irqrestore(&p->sighand->siglock, flags);