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SubjectRe: [PATCH -mm 2/4][AIO] - export good_sigevent()


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-mm2/include/linux/signal.h
===================================================================
--- linux-2.6.19-rc5-mm2.orig/include/linux/signal.h 2006-11-17
11:20:08.000000000 +0100 +++ linux-2.6.19-rc5-mm2/include/linux/signal.h
2006-11-17 11:20:31.000000000 +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-mm2/kernel/posix-timers.c
===================================================================
--- linux-2.6.19-rc5-mm2.orig/kernel/posix-timers.c 2006-11-17
11:20:08.000000000 +0100 +++ linux-2.6.19-rc5-mm2/kernel/posix-timers.c
2006-11-17 11:20:31.000000000 +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-mm2/kernel/signal.c
===================================================================
--- linux-2.6.19-rc5-mm2.orig/kernel/signal.c 2006-11-17
11:20:08.000000000 +0100 +++ linux-2.6.19-rc5-mm2/kernel/signal.c
2006-11-17 11:20:31.000000000 +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)
-
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