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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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