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signals: split do_tkill

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Split out the code from do_tkill to make it reusable by the follow up
patch which implements sys_rt_tgsigqueueinfo

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
Thomas Gleixner 2009-04-04 21:01:01 +00:00
parent 091438dd56
commit 30b4ae8a44
1 changed files with 18 additions and 12 deletions
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30
kernel/signal.c
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@ -2278,24 +2278,17 @@ SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
return kill_something_info(sig, &info, pid);
}
static int do_tkill(pid_t tgid, pid_t pid, int sig)
static int
do_send_specific(pid_t tgid, pid_t pid, int sig, struct siginfo *info)
{
int error;
struct siginfo info;
struct task_struct *p;
unsigned long flags;
error = -ESRCH;
info.si_signo = sig;
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = task_tgid_vnr(current);
info.si_uid = current_uid();
int error = -ESRCH;
rcu_read_lock();
p = find_task_by_vpid(pid);
if (p && (tgid <= 0 || task_tgid_vnr(p) == tgid)) {
error = check_kill_permission(sig, &info, p);
error = check_kill_permission(sig, info, p);
/*
* The null signal is a permissions and process existence
* probe. No signal is actually delivered.
@ -2305,7 +2298,7 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
* signal is private anyway.
*/
if (!error && sig && lock_task_sighand(p, &flags)) {
error = specific_send_sig_info(sig, &info, p);
error = specific_send_sig_info(sig, info, p);
unlock_task_sighand(p, &flags);
}
}
@ -2314,6 +2307,19 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
return error;
}
static int do_tkill(pid_t tgid, pid_t pid, int sig)
{
struct siginfo info;
info.si_signo = sig;
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = task_tgid_vnr(current);
info.si_uid = current_uid();
return do_send_specific(tgid, pid, sig, &info);
}
/**
* sys_tgkill - send signal to one specific thread
* @tgid: the thread group ID of the thread