[PATCH -mm 2/3][AIO] - AIO completion signal notification

["Sébastien Dugué" <sebastien.dugue@bull.net>]

                      Export good_sigevent()


  Move good_sigevent() from posix-timers.c to signal.c where it belongs,
and export it so that it can be used by other subsystems.


 include/linux/signal.h |    2 ++
 kernel/posix-timers.c  |   17 -----------------
 kernel/signal.c        |   23 +++++++++++++++++++++++
 3 files changed, 25 insertions(+), 17 deletions(-)

Signed-off-by: Sébastien Dugué <sebastien.dugue@bull.net>


Index: linux-2.6.19-rc5-mm1/include/linux/signal.h
===================================================================
--- linux-2.6.19-rc5-mm1.orig/include/linux/signal.h	2006-11-09 10:43:58.000000000 +0100
+++ linux-2.6.19-rc5-mm1/include/linux/signal.h	2006-11-09 10:46:23.000000000 +0100
@@ -241,6 +241,8 @@ extern int sigprocmask(int, sigset_t *, 
 struct pt_regs;
 extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);
 
+extern struct task_struct * good_sigevent(sigevent_t *);
+
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_SIGNAL_H */
Index: linux-2.6.19-rc5-mm1/kernel/posix-timers.c
===================================================================
--- linux-2.6.19-rc5-mm1.orig/kernel/posix-timers.c	2006-11-09 10:43:58.000000000 +0100
+++ linux-2.6.19-rc5-mm1/kernel/posix-timers.c	2006-11-09 10:46:23.000000000 +0100
@@ -367,23 +367,6 @@ static enum hrtimer_restart posix_timer_
 	return ret;
 }
 
-static struct task_struct * good_sigevent(sigevent_t * event)
-{
-	struct task_struct *rtn = current->group_leader;
-
-	if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
-		(!(rtn = find_task_by_pid(event->sigev_notify_thread_id)) ||
-		 rtn->tgid != current->tgid ||
-		 (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL))
-		return NULL;
-
-	if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
-	    ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
-		return NULL;
-
-	return rtn;
-}
-
 void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock)
 {
 	if ((unsigned) clock_id >= MAX_CLOCKS) {
Index: linux-2.6.19-rc5-mm1/kernel/signal.c
===================================================================
--- linux-2.6.19-rc5-mm1.orig/kernel/signal.c	2006-11-09 10:43:58.000000000 +0100
+++ linux-2.6.19-rc5-mm1/kernel/signal.c	2006-11-09 10:46:23.000000000 +0100
@@ -1189,6 +1189,29 @@ int group_send_sig_info(int sig, struct 
 	return ret;
 }
 
+/***
+ * good_sigevent - check and get target task from a sigevent.
+ * @event: the sigevent to be checked
+ *
+ * This function must be called with tasklist_lock held for reading.
+ */
+struct task_struct * good_sigevent(sigevent_t * event)
+{
+	struct task_struct *rtn = current->group_leader;
+
+	if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
+		(!(rtn = find_task_by_pid(event->sigev_notify_thread_id)) ||
+		 rtn->tgid != current->tgid ||
+		 (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL))
+		return NULL;
+
+	if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
+	    ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
+		return NULL;
+
+	return rtn;
+}
+
 /*
  * kill_pgrp_info() sends a signal to a process group: this is what the tty
  * control characters do (^C, ^Z etc)